HPAVC/HPAVC CD-ROM.iso/pc/INTER53C.ZIP/INTERRUP.K

Text File | 1997-01-12 | 348.1 KB | 9,494 lines

Interrupt List, part 11 of 16
Copyright (c) 1989,1990,1991,1992,1993,1994,1995,1996,1997 Ralf Brown
--------N-2FB800-----------------------------
INT 2F - NETWORK - INSTALLATION CHECK
    AX = B800h
Return: AL = status
        00h        not installed
        nonzero installed
          BX = installed component flags (test in this order!)
           bit 6   server
           bit 2   messenger
           bit 7   receiver
           bit 3   redirector
           bit 1   LANPUP (LANtastic 4.0)
Notes:    this function is supported by PC LAN Program, LAN Manager, LANtastic,
      NetWare Lite, SilverNET, 10NET, etc.
    LANtastic and NetWare Lite use only BL for the return value, preserving
      BH; LAN Manager and DOS LAN Requester return BH=00h.    This permits
      differentiation between those two groups by setting BH to a nonzero
      value before the call and checking its value on return.
SeeAlso: AX=4E53h,AX=B809h
--------N-2FB800CXF041-----------------------
INT 2F - 10NET - INSTALLATION CHECK
    AX = B800h
    CX = F041h
Return: AL = status
        00h        not installed
        nonzero installed
        BX = installed component flags (test in this order!)
           bit 6   server
           bit 2   messenger
           bit 7   receiver
           bit 3   redirector
           bit 1   LANPUP (LANtastic 4.0)
        CX = 10Net data segment
        CX:DX -> 10Net Configuration Table
              (see #1031 at INT 21/AX=5E01h"10NET")
Note:    if CX <> F041h on entry, neither CX nor DX will be changed, and this
      call becomes identical to the standard installation check above
SeeAlso: AX=B800h"network",INT 21/AX=5E01h"10NET"
--------N-2FB803-----------------------------
INT 2F - NETWORK - GET NETWORK EVENT POST HANDLER
    AX = B803h
Return: ES:BX -> current event post handler (see AX=B804h)
Note:    this function is supported by PC LAN Program, 10NET v5.0,
      NetSoft DOS-NET v1.20+
SeeAlso: AX=B800h,AX=B804h,AX=B903h
--------N-2FB804-----------------------------
INT 2F - NETWORK - SET NETWORK EVENT POST HANDLER
    AX = B804h
    CX = (10NET) 0370h if 10Windows is hooking post handler
    ES:BX -> new event post handler (see #2252)
Notes:    used in conjunction with AX=B803h to hook into the network event post
      routine
    this function is supported by PC LAN Program, 10NET v5.0,
      NetSoft DOS-NET v1.20+
    The specified handler is called on any network event.  Two events are
      defined: message received and critical network error.
SeeAlso: AX=B800h,AX=B803h,AX=B904h

(Table 2252)
Values network post routine is called with:
    AX = 0000h single block message
        DS:SI -> ASCIZ originator name
        DS:DI -> ASCIZ destination name
        ES:BX -> text header (see #2253)
    AX = 0001h start multiple message block
        CX = block group ID
        DS:SI -> ASCIZ originator name
        DS:DI -> ASCIZ destination name
    AX = 0002h multiple block text
        CX = block group ID
        ES:BX -> text header (see #2253)
    AX = 0003h end multiple block message
        CX = block group ID
    AX = 0004h message aborted due to error
        CX = block group ID
    AX = 0101h server received badly formatted network request
        Return: AX = FFFFh (PC LAN will process error)
    AX = 0102h unexpected network error
        ES:BX -> NCB (see #2500 at INT 5C"NetBIOS")
    AX = 0103h server received INT 24 error
        other registers as for INT 24, except AH is in BH
        Return: as below, but only 0000h and FFFFh allowed
Return: AX = response code
        0000h user post routine processed message
        0001h PC LAN will process message, but message window not displayed
        FFFFh PC LAN will process message

Format of text header:
Offset    Size    Description    (Table 2253)
 00h    WORD    length of text (maximum 512 bytes)
 02h  N BYTEs    text of message
Note:    all CRLF sequences in message text are replaced by 14h; all other
      values below 20h (space) are reserved
--------N-2FB807-----------------------------
INT 2F - NETWORK - GET NetBIOS NAME NUMBER OF MACHINE NAME
    AX = B807h
Return: CH = NetBIOS name number of the machine name
SeeAlso: INT 21/AX=5E00h
--------N-2FB808-----------------------------
INT 2F U - NETWORK - RELINK KEYBOARD HANDLER
    AX = B808h
    ES:BX -> INT 09 handler network should call after it finishes INT 09
Notes:    this call replaces the address to which the network software chains on
      an INT 09 without preserving the original value.  This allows a prior
      handler to unlink, but does not allow a new handler to be added
      such that the network gets the INT 09 first unless the new handler
      completely takes over INT 09 and never chains.
    this function is called by the DOS 3.2 KEYBxx.COM
SeeAlso: AX=B908h
--------N-2FB809-----------------------------
INT 2F - NETWORK - LANtastic, NetWare Lite - GET VERSION
    AX = B809h
Return: AH = major version
    AL = minor version (decimal)
Notes:    this function is supported in this form by LANtastic, NetWare Lite,
      SilverNET, ...
    NetWare Lite returns its own version number rather than a PC LAN
      compatibility version
SeeAlso: AX=4E53h,AX=B800h,AX=B809h"PC LAN Program"
--------N-2FB809-----------------------------
INT 2F - NETWORK - PC LAN Program - GET VERSION
    AX = B809h
Return: AH = minor version (decimal)
    AL = major version
Notes:    this function is supported in this form by PC LAN Program, LAN Manager,
      the DOS LAN Requester, and 10NET v5.0
    10NET returns version 1.10 (AX=0A01h) for compatibility
SeeAlso: AX=4E53h,AX=B800h,AX=B809h"LANtastic"
--------N-2FB80A-----------------------------
INT 2F u - PC Network 1.00 - ???
    AX = B80Ah
    ???
Return: ???
Program: PC Network is an early networking package which was renamed the
      IBM PC Local Area Network Program (PC LAN Program) as of v1.10
Note:    called by RECEIVER (equivalent to NetWare Lite SERVER)
--------N-2FB80F-----------------------------
INT 2F - DOS LAN Requester - GET START PARAMETERS
    AX = B80Fh
    CX = size of return data buffer
    ES:DI -> return data buffer (see #2254)
Return: AX = status
         00h     network started
         nonzero network not started
    CX = number of bytes returned in buffer
    ES:DI buffer filled
SeeAlso: AX=B809h"PC LAN Program"

Format of DOS LAN Requester return data buffer:
Offset    Size    Description    (Table 2254)
 00h    BYTE    major version
 01h    BYTE    minor version
 02h    WORD    configuration flags given when network was started (see #2255)
 04h 15 BYTEs    NET START machine name (space padded)
 13h    BYTE    00h
 14h 9    BYTEs    NET START domain name (NULL padded)
 1Dh    BYTE    00h
 1Eh 32 BYTEs    /WRK heuristics string (space padded, not terminated)
 3Eh    WORD    /SRV value
 40h    WORD    /ASG value
 42h    WORD    /NBC value
 44h    WORD    /NBS value
 46h    WORD    /BBC value
 48h    WORD    /BBS value
 4Ah    WORD    /PBC value
 4Ch    WORD    /PBS value
 4Eh    WORD    /PFS value
 50h    WORD    /PFT value
 52h    WORD    /PWT value
 54h    WORD    /KUC value
 56h    WORD    /KST value
 58h    WORD    /NVS value
 5Ah    WORD    /NMS value
 5Ch    WORD    /NDB value
 5Eh    WORD    /MBI value
 60h    BYTE    NetBIOS name number for machine name
 61h    BYTE    NetBIOS name number for domain name
 62h    WORD    NetBIOS sessions required for configuration
 64h    WORD    NetBIOS commands required for configuration
 66h    WORD    NetBIOS names required for configuration
 68h 128 BYTEs    NET START path (LANROOT)
 E8h    BYTE    00h

Bitfields for configuration flags:
Bit(s)    Description    (Table 2255)
 0    /NVS nonzero
 1    /NMS nonzero
 2    /API
 3    /HIM
 4    /LIM
 5    /ENC
 6    /POP
 7    /EMS
 8    /RPL
 9-12    reserved
 13    RDR started
 14    RCV started
 15    User is currently logged on
--------N-2FB900-----------------------------
INT 2F - PC Network RECEIVER.COM - INSTALLATION CHECK
    AX = B900h
Return: AL = state
        00h if not installed
        FFh if installed
--------N-2FB901-----------------------------
INT 2F - PC Network RECEIVER.COM - GET RECEIVER.COM INT 2F HANDLER ADDRESS
    AX = B901h
Return: AL = ???
    ES:BX -> RECEIVER.COM INT 2F handler
Desc:    allows more efficient execution by letting the caller bypass any other
      INT 2F handlers which have been added since RECEIVER.COM was
      installed
--------N-2FB903-----------------------------
INT 2F - PC Network RECEIVER.COM - GET RECEIVER.COM POST ADDRESS
    AX = B903h
Return: ES:BX -> POST handler
SeeAlso: AX=B803h,AX=B904h
--------N-2FB904-----------------------------
INT 2F - PC Network RECEIVER.COM - SET RECEIVER.COM POST ADDRESS
    AX = B904h
    ES:BX -> new POST handler
SeeAlso: AX=B804h,AX=B903h
--------N-2FB905-----------------------------
INT 2F - PC Network RECEIVER.COM - GET FILENAME
    AX = B905h
    DS:BX -> 128-byte buffer for filename 1
    DS:DX -> 128-byte buffer for filename 2
Return: buffers filled from RECEIVER.COM internal buffers
Note:    use of filenames is unknown, but one appears to be for storing messages
SeeAlso: AX=B906h
--------N-2FB906-----------------------------
INT 2F - PC Network RECEIVER.COM - SET FILENAME
    AX = B906h
    DS:BX -> 128-byte buffer for filename 1
    DS:DX -> 128-byte buffer for filename 2
Return: RECEIVER.COM internal buffers filled from user buffers
Note:    use of filenames is unknown, but one appears to be for storing messages
SeeAlso: AX=B905h
--------N-2FB908-----------------------------
INT 2F - PC Network RECEIVER.COM - UNLINK KEYBOARD HANDLER
    AX = B908h
    ES:BX -> INT 09 handler RECEIVER should call after it finishes INT 09
Note:    this call replaces the address to which RECEIVER.COM chains on an
      INT 09 without preserving the original value.     This allows a prior
      handler to unlink, but does not allow a new handler to be added
      such that RECEIVER gets the INT 09 first.
SeeAlso: AX=B808h
--------V-2FBC00-----------------------------
INT 2F - Windows 3.0, DOS 5+ EGA.SYS - INSTALLATION CHECK
    AX = BC00h
Return: AL = state
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
        BX = 5456h ("TV")
Range:    AH=80h to AH=FFh, selected by commandline switch
SeeAlso: AX=BC06h"EGA",INT 10/AH=FAh"EGA"
--------s-2FBC00BX3F3F-----------------------
INT 2F - MediaVision MVSOUND.SYS - INSTALLATION CHECK
    AX = BC00h
    BX = 3F3Fh ('??')
    CX = 0000h
    DX = 0000h
Return: if installed, BX XOR CX XOR DX = 4D56h ('MV')
Program: MVSOUND.SYS is a driver for the MediaVision ProAudio Spectrum family
      of sound boards; its primary programmer was Bryan Crane
SeeAlso: AX=BC01h"MVSOUND",AX=BC02h,AX=BC03h,AX=BC04h,AX=BC06h"MVSOUND"
--------s-2FBC01-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET VERSION
    AX = BC01h
    BX = magic value 6D20h ('m ')
    CX = magic value 2076h (' v')
    DX = magic value 2020h ('  ')
Return: BX = ASCII major version (leading zeros significant)
    CX = ASCII minor version (leading zeros significant)
SeeAlso: AX=BC00h/BX=3F3Fh
--------s-2FBC02-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET STATE TABLE POINTER
    AX = BC02h
Return: BX:DX -> state table
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC03h
--------s-2FBC03-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET FUNCTION TABLE POINTER
    AX = BC03h
Return: BX:DX -> function table
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC02h
--------s-2FBC04-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET DMA AND IRQ CHANNELS
    AX = BC04h
Return: AX = 4D56h ('MV')
    BL = DMA channel
    CL = IRQ number
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC01h"MVSOUND"
--------V-2FBC06-----------------------------
INT 2F U - MS Windows 3.0, DOS 5+ EGA.SYS - GET VERSION INFO
    AX = BC06h
Return: BX = 5456h ("TV")
    CH = major version
    CL = minor version
    DL = revision
SeeAlso: AX=BC00h"EGA",INT 10/AH=FAh"EGA"
--------s-2FBC06-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET STATUS STRING
    AX = BC06h
Return: AX = 4D56h ('MV')
    DX:BX -> status string (first byte 0Ch if no status message to display)
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC01h"MVSOUND",AX=BC0Bh"MVSOUND"
--------s-2FBC0B-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET EXECUTABLE PATH
    AX = BC0Bh
Return: BX:DX -> ASCIZ path for MVPROAS.EXE, 0000h:0000h if not available
SeeAlso: AX=BC00h/BX=3F3Fh
--------U-2FBE00-----------------------------
INT 2F - REDVIEW - INSTALLATION CHECK
    AX = BE00h
Return: AL = FFh if installed
Program: REDVIEW is a public-domain TSR by Alexandr Novy and Petr Horak which
      copies data sent to standard output to standard error when the
      former has been redirected to a file, thus allowing the data to
      be seen on the screen at the same time it is captured in a file
--------N-2FBF00-----------------------------
INT 2F - PC LAN PROGRAM REDIRIFS.EXE internal - INSTALLATION CHECK
    AX = BF00h
Return: AL = FFh if installed
Note:    this function is also supported by NetSoft's DOS-NET v1.20+; however,
      none of the remaining BFxxh calls are supported
SeeAlso: AX=BF01h,AX=BF80h,INT 2A/AX=4147h
--------N-2FBF01-----------------------------
INT 2F U - PC LAN PROGRAM REDIRIFS.EXE internal - ???
    AX = BF01h
    ???
Return: ???
SeeAlso: AX=BF00h
--------N-2FBF80-----------------------------
INT 2F - PC LAN PROG REDIR.SYS internal - SET REDIRIFS ENTRY POINT
    AX = BF80h
    ES:DI -> FAR entry point to IFS handler in REDIRIFS
Return: AL = FFh if installed
        ES:DI -> internal workspace
Note:    all future IFS calls to REDIR.SYS are passed to the ES:DI entry point
SeeAlso: AX=BF00h
--------F-2FC0-------------------------------
INT 2F - MTEZ XpressFax Hardware TSR (CLASS2) - API
    AH = C0h
    AL = function code (01h to 15h)
Return: ???
SeeAlso: AX=C000h/BX=444Bh,AX=CB00h/BX=4D53h
--------N-2FC000-----------------------------
INT 2F - Novell ODI Link Support Layer (LSL.COM) - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        DX:BX -> FAR entry point (see #2256,#2257,#2258)
        ES:SI -> signature string "LINKSUP$"
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    on return, ES = DX for LSL v1.10 and v2.05; LSL makes use of this in
      its search for a previous installation
SeeAlso: AX=5100h,AX=C000h"NESL"

(Table 2256)
Call LSL function "Request MLID Registration" with:
    BX = 0001h
    ES:SI -> registration??? record (see #2260)
    DS:DI -> buffer for LSL information block (see #2261)
Return: AX = completion code (0000h,8001h) (see #2259)
    DS:DI buffer filled if successful
    BX,CX corrupted
Note:    see "Novell LAN Driver Developer's Guide, Volume III" for more details

(Table 2257)
Call LSL function "get support entry points" with:
    BX = 0002h
    ES:SI -> buffer for entry point record (see #2262)
Return: ES:SI buffer filled

(Table 2258)
Call LSL function "Request MLID API entry point" with:
    BX = 0003h
Return: ES:SI -> MLID (Multiple Link Interface Driver) API entry point
        (call with BX=function 00h-10h, not range-checked)
Note:    LSL v1.10 and v2.05 execute BX=0003h for BX=0000h and any BX >= 0003h

(Table 2259)
Values for LSL completion code:
 0000h    successful
 8001h    out of resources
 8002h    bad parameter
 8003h    no more items
 8004h    item not present
 8005h    failed
 8006h    receive overflow
 8007h    canceled
 8008h    bad command
 8009h    duplicate entry
 800Ah    no such handler
 800Bh    no such driver

Format of LSL registration record:
Offset    Size    Description    (Table 2260)
 00h    DWORD    -> ??? FAR function (to be called with ES:SI -> ??? and
          returning AX = completion code)
 04h    DWORD    -> ???
 08h    DWORD    -> ??? data (at least 3Eh bytes)

Format of LSL information block:
Offset    Size    Description    (Table 2261)
 00h    DWORD    -> ??? entry point (called with BX=function 00h-11h)
 04h    WORD    ???
 06h    WORD    ???
Note:    due to a fencepost error, LSL v2.05 (distributed with Novell DOS 7)
      will crash if the above entry point is called with BX=0012h

Format of entry point record:
Offset    Size    Description    (Table 2262)
 00h    DWORD    pointer to protocol support entry point in LSL (see #2263)
 04h    DWORD    pointer to general support entry point in LSL (see #2264)

(Table 2263)
Call protocol support entry point with:
    BX = function number
        0000h ???
        0001h ???
        0002h ???
        0003h "ScheduleAESEvent"
        ES:SI -> AES ECB to be scheduled (see #2267)
        Return: ES,SI preserved
        0004h "CancelAESEvent"
        ES:SI -> ECB to be cancelled (see #2267)
        Return: ES,SI preserved
        0005h "GetIntervalMarker"
        Return: DX:AX = current interval marker in milliseconds
            all other registers preserved
        0006h "RegisterStack"
        AX = logical board number
        ES:SI -> bound stack info structure (see #2277)
        Return: BX = assigned Stack ID if AX=0000h
        0007h "DeRegisterStack"
        AX = protocol stack's assigned Stack ID
        0008h "RegisterDefaultStack"
        AX = logical board number
        ES:SI -> stack info structure (see #2278)
        0009h "DeRegisterDefaultStack"
        AX = logical board number
        000Ah "RegisterPrescanStack"
        AX = logical board number
        ES:SI -> stack info structure (see #2278)
        000Bh "DeRegisterPrescanStack"
        AX = logical board number
        000Ch "SendPacket"
        ES:SI -> send ECB
        Return: interrupts disabled
        000Dh ???
        000Eh ???
        000Fh ???
        0010h "GetStackIDFromName"
        ES:SI -> counted NUL-terminated protocol name (max 15 chars)
        Return: BX = Stack ID if AX=0000h
        0011h "GetPIDFromStackIDBoard"
        AX = Stack ID for protocol
        CX = logical board number
        ES:SI -> 6-byte buffer for protocol ID
        0012h "GetMLIDControlEntry"
        AX = logical board number
        Return: ES:SI -> MLID control handler (see #2265) if AX=0000h
        0013h "GetProtocolControlEntry"
        AX = Stack ID or
            FFFEh Prescan stack
                CX = logical board number
            FFFFh default protocol
                CX = logical board number
        Return: ES:SI -> protocol stack control entry point if AX=0000h
                  (see #2266)
        0014h "GetLSLStatistics"
        Return: AX = 0000h (successful)
            ZF set
            ES:SI -> LSL statistics table (see #2269)
        0015h "BindStack"
        AX = protocol stack's assigned Stack ID
        CX = logical board number
        0016h "UnbindStack"
        AX = protocol stack's assigned Stack ID
        CX = logical board number
        0017h "AddProtocolID"
        AX = frame type ID code
        ES:SI -> 6-byte protocol ID
        CX:DI -> counted NUL-terminated short protocol name (max 15 ch)
        0018h "RelinquishControl"
        Return: after LSL performs any necessary background processing
        0019h "GetLSLConfiguration"
        Return: AX = 0000h (successful)
            ZF set
            ES:SI -> LSL configuration table (see #2268)
        001Ah "GetTickMarker"
        Return: AX = number of 55ms ticks since LSL loaded
            BX destroyed
Return: AX = completion code (see #2259)
    ZF set if successful
    SS:SP, DS, BP preserved; most other registers may be destroyed

(Table 2264)
Call general support entry point with:
    BX = function number
        0000h "Allocate Memory" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0001h "Free Memory" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0002h "Realloc Memory" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0003h "Memory Statistics" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0004h "Add Memory To Pool" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0005h "AddGeneralService"
        ES:SI -> General Service Control Block (see #2279)
        0006h "RemoveGeneralService"
        ES:SI -> General Service Control Block (see #2279)
        0007h "GetNETcfgPath"
        Return: AX = 0000h (successful)
            DS:DX -> ASCIZ pathname for NET.CFG
        0008h U ???     (in LSL 1.10)
        Return: AX = 0000h
            ES:SI -> ??? (a 22-byte data area)
        000Ah "GetCriticalSectionStatus"
        Return: BX = total outstanding calls to "StartCriticalSection"
        000Bh "ServiceEvents"
        interrupts disabled
        Return: interrupts disabled
        0010h "GetStackECB"
        DS:DI -> Lookahead structure (see #2280)
        interrupts disabled
        Return: ES:SI -> ECB if successful (AX=0000h,ZF set)
            interrupts disabled
        8000h-FFFFh reserved for user general service providers
Return: AX = completion code (see #2259)
    ZF set if successful
    SS:SP, DS, BP preserved

(Table 2265)
Call MLID control handler with:
    AX = logical board number
    BX = function number
        0000h "GetMLIDConfiguration"
        Return: ES:SI -> MLID's configuration table if successful
                  (see #2272 for format)
        0001h "GetMLIDStatistics"
        Return: ES:SI -> MLID's statistics table if successful
                  (see #2272 for format)
        0002h "AddMulticastAddress"
        ES:SI -> 6-byte multicast address to add
        0003h "DeleteMulticastAddress"
        ES:SI -> 6-byte multicast address to delete
        0005h "MLIDShutdown"
        CX = type
            0000h permanent (also deregisters from LSL)
            other temporary (shutdown hardware only)
        0006h "MLIDReset" reinitialize board / restart from temp shutdown
        0007h "Create Connection" (obsolete?)
        ???
        0008h "Delete Connection" (obsolete?)
        ???
        0009h "SetLookAheadSize"
        CX = requested lookahead size (00h-80h)
        000Ah "PromiscuousChange"
        CX = what to receive promiscuously
            bit 0: MAC frames
            bit 1: non-MAC frames
        000Bh "RegisterReceiveMonitor"
        CX = subfunction
            0000h disable receive monitoring
            else  enable receive monitoring
        ES:SI -> monitor receive routine
        ES:DI -> monitor transmit routine
        000Ch "Driver Poll" (obsolete?)
        ???
Return: AX = completion code (see #2259)
    ZF set if successful
Note:    not all boards/MLIDs support function 0010h; see bit 13 in the MLID
      mode flags field of the MLID's configuration table

(Table 2266)
Call protocol stack control entry point with:
    BX = function number
        0000h "GetProtocolStackConfiguration"
        Return: ES:SI -> protocol stack's configuration table
                   (see #2271)
        0001h "GetProtocolStackStatistics"
        Return: ES:SI -> protocol stack's statistics table (see #2270)
        0002h "BindToMLID"
        CX = board number to bind to
        ES:SI -> implementation-dependant parameter string
        0003h "UnBindFromMLID"
        CX = board number from which protocol should unbind
        ES:SI -> optional implementation-dependant parameter string
        0004h "MLIDDeRegistered"
        CX = board number that has de-registered from LSL
Return: AX = status
        0000h successful
        else implementation-dependant error codes
    ZF set if successful
    SS:SP, DS, BP preserved

Format of AES ECB:
Offset    Size    Description    (Table 2267)
 00h    DWORD    "AESLink" pointer used by LSL for list management
 04h    DWORD    number of milliseconds to wait
 08h    DWORD    "AESStatus" (is set to 00000000h when AES ESR is invoked)
 0Ch    DWORD    -> function to be invoked when time expires
        ES:SI will point to this structure on entry,
        DS, BP, and SS:SP must be preserved.
SeeAlso: #2281

Format of LSL Configuration Table:
Offset    Size    Description    (Table 2268)
 00h    BYTE    major version of configuration table
 01h    BYTE    minor version of configuration table (decimal, 0-99)
 02h  8 BYTEs    reserved
 0Ah    BYTE    LSL major version (decimal)
 0Bh    BYTE    LSL minor version (decimal, 0-99)
---LSL 1.0x ---
 0Ch 14 BYTEs    reserved
---LSL 1.10+ ---
 0Ch    WORD    maximum number of boards which LSL can handle
 0Eh    WORD    maximum number of protocol IDs which LSL can handle
 10h 12 BYTEs    reserved

Format of LSL Statistics Table:
Offset    Size    Description    (Table 2269)
 00h    BYTE    major version of statistics table format
 01h    BYTE    minor version of statistics table format (decimal, 0-99)
 02h    WORD    "GenericCounters" number of counters in static portion of
          table
 04h    DWORD    "ValidCountersMask" bit mask indicating which generic
          counters are actually used.  Bit 31 = TotalTxPackets, bit 30
          is the next field, etc.
 08h    DWORD    "TotalTxPackets" total SendPacket requests made
 0Ch    DWORD    reserved
 10h    DWORD    reserved
 14h    DWORD    "AESEventsCount" number of completed AES events
 18h    DWORD    "PostponedEvents" number of events postponed due to critical
          sections inside the MLIDs
 1Ch    DWORD    "CancelAESFailures" number of times CancelAESEvent failed
 20h    DWORD    reserved
 24h    DWORD    reserved
 28h    DWORD    "TotalRxPackets" total number of GetStackECB requests
 2Ch    DWORD    "UnclaimedPackets" total number of packets not consumed by a
          protocol stack
 30h    WORD    "NumberCustom" number of custom variables that follow
 32h  N DWORDs    custom counters
      N DWORDs    -> CustomCounterStrN (one per custom counter)
    var    length-prepended and NULL terminated string for Counter 0
    ...
    var    length-prepended and NULL terminated string for Counter N-1
SeeAlso: #2270,#2276

Format of Protocol Stack Statistics Table:
Offset    Size    Description    (Table 2270)
 00h    BYTE    statistics table major version
 01h    BYTE    statistics table minor version (decimal, 0-99)
 02h    WORD    number of generic counters following
 04h    DWORD    "ValidCountersMask" (bitmask, bit 31 is TotalTxPackets)
 08h    DWORD    TotalTxPackets
 0Ch    DWORD    TotalRxPackets
 10h    DWORD    IgnoredRxPackets
 14h    WORD    number of custom counters
 16h  N DWORDs    custom counters
      N DWORDs    -> CustomCounterStrN (one per custom counter)
    var    length-prepended and NULL terminated string for Counter 0
    ...
    var    length-prepended and NULL terminated string for Counter N-1
SeeAlso: #2269,#2276

Format of Protocol Stack Configuration Table:
Offset    Size    Description    (Table 2271)
 00h    BYTE    configuration table major version
 01h    BYTE    configuration table minor version (decimal, 0-99)
 02h    DWORD    -> counted NUL-terminated long descriptive name for protocol
 06h    DWORD    -> counted NUL-terminated short name for protocol (15 chars)
 0Ah    BYTE    protocol stack major version
 0Bh    BYTE    protocol stack minor version (decimal, 0-99)
 0Ch 16 BYTEs    reserved for future use

Format of MLID Configuration Table:
Offset    Size    Description    (Table 2272)
 00h 26 BYTEs    signature 'HardwareDriverMLID         ' (8 spaces on end)
 1Ah    BYTE    configuration table major version
 1Bh    BYTE    configuration table minor version (decimal, 0-99)
 1Ch  6 BYTEs    node address
 22h    WORD    MLID mode flags (see #2273)
 24h    WORD    board number
 26h    WORD    board instance (if more than one of same board installed)
 28h    WORD    maximum packet size
 2Ah    WORD    BestDataSize
 2Ch    WORD    WorstDataSize
 2Eh    DWORD    -> counted NUL-terminated long name for NIC
 32h    DWORD    -> counted NUL-terminated short name for NIC (8 chars max)
 36h    DWORD    -> counted NUL-terminated Frame and Media type
 3Ah    WORD    reserved (0000h)
 3Ch    WORD    frame type ID
 3Eh    WORD    TransportTime (milliseconds)
 40h    DWORD    -> SourceRouteHandler for TokenRing. (Used by ROUTE.COM)
 44h    WORD    lookahead size
 46h    WORD    line speed (Mbps if high bit clear, else Kbps)
 48h    WORD    QueueDepth
 4Ah  6 BYTEs    reserved (0)
 50h    BYTE    driver major version
 51h    BYTE    driver minor version (decimal, 0-99)
 52h    WORD    bus/multicast flags (see #2274)
 54h    WORD    send retries
 56h    DWORD    ConfigTableLink
 5Ah    WORD    MLID sharing flags (see #2275)
 5Ch    WORD    slot number
 5Eh    WORD    I/O address 1
 60h    WORD    I/O range 1
 62h    WORD    I/O address 2
 64h    WORD    I/O range 2
 66h    DWORD    memory address 1
 6Ah    WORD    memory size 1
 6Ch    DWORD    memory address 2
 70h    WORD    memory size 2
 72h    BYTE    interrupt line 1
 73h    BYTE    interrupt line 2
 74h    BYTE    DMA line 1
 75h    BYTE    DMA line 2

Bitfields for MLID mode flags:
Bit(s)    Description    (Table 2273)
 15    MLID supports Octet Reversal
 14    node address is non-canonical
 13    promiscuous mode is supported
 12-8    reserved
 7    LDataSize field in LookAhead structure supported
 6    raw send supported
 5    MLID needs to be polled by LSL
 4    reserved (0)
 3    multicasting is supported
 2    not currently used by DOS ODI, set to 0.
 1    network card uses DMA.
 0    RealDriverBit, always set to 1.

Bitfields for bus/multicast flags:
Bit(s)    Description    (Table 2274)
 10-9    specialized multicast support
    00 = Group addressing is default for medium
    01 = Invalid
    10 = Filter group address in MLID.
    11 = Adapter filters group address.
 2    supports Micro Channel cards
 1    supports ISA cards
 0    supports EISA cards

Bitfields for MLID sharing flags:
Bit(s)    Description    (Table 2275)
 8    NIC can share DMA2
 7    NIC can share DMA1
 6    NIC can share IRQ2
 5    NIC can share IRQ1
 4    NIC can share Memory2
 3    NIC can share Memory1
 2    NIC can share IO2
 1    NIC can share IO1
 0    MLID is currently shut down

Format of MLID Statistics Table:
Offset    Size    Description    (Table 2276)
 00h    BYTE    driver statistics table major version
 01h    BYTE    driver statistics table minor version (decimal, 0-99)
 02h    WORD    number of generic counters (typically 13)
 04h    DWORD    "ValidCountersMask" (bit mask, bit 31 is TotalTxCount)
 08h    DWORD    TotalTxCount
 0Ch    DWORD    TotalRxCount
 10h    DWORD    NoECBAvailableCount
 14h    DWORD    TxTooBigCount
 18h    DWORD    TxTooSmallCount
 1Ch    DWORD    RxOverflowCount
 20h    DWORD    RxTooBigCount
 24h    DWORD    RxTooSmallCount
 28h    DWORD    TxMiscCount
 2Ch    DWORD    RxMiscCount
 30h    DWORD    TxRetryCount
 34h    DWORD    RxChecksumErrorCount
 38h    DWORD    RxMismatchCount
 3Ch    WORD    number of custom counters
 3Eh  N DWORDs    custom counters
      N DWORDs    -> CustomCounterStrN (one per custom counter)
    var    length-prepended and NULL terminated string for Counter 0
    ...
    var    length-prepended and NULL terminated string for Counter N-1
SeeAlso: #2269,#2270

Format of bound stack info structure:
Offset    Size    Description    (Table 2277)
 00h    DWORD    -> protocol stack's short name (counted, NUL-terminated)
 04h    DWORD    -> receive handler
 08h    DWORD    -> control handler

Format of stack info structure:
Offset    Size    Description    (Table 2278)
 00h    DWORD    -> receive handler
 04h    DWORD    -> control handler

Format of General Service Control Block:
Offset    Size    Description    (Table 2279)
 00h    DWORD    -> next GSCB (maintained internally by LSL)
 04h    DWORD    -> entry point for general service handler
 08h    WORD    command code for this general service (8000h-FFFFh)
Note:    the control block must not be altered or deallocated until the general
      service is removed

Format of Lookahead structure:
Offset    Size    Description    (Table 2280)
 00h    DWORD    -> Media header
 04h    DWORD    -> lookahead buffer
 08h    WORD    length of lookahead buffer
 0Ah  6 BYTEs    protocol ID
 10h    WORD    logical board number
 12h    WORD    lookahead size

Format of ODI ECB:
Offset    Size    Description    (Table 2281)
 00h    DWORD    link to next ECB
 04h    DWORD    link to previous ECB
 08h    WORD    general status
        0000h received successfully
        8006h packet overflow
        8007h reception aborted (data not valid)
 0Ah    DWORD    -> event service routine or RETF (never 0000h:0000h)(see #2282)
 0Eh    WORD    protocol stack identifier
 10h  6 BYTEs    protocol ID (sending only)
 16h    WORD    MLID board number (sending only)
 18h  6 BYTEs    MAC destination address
 1Eh  4 BYTEs    driver workspace
 22h  8 BYTEs    protocol workspace
 2Ah    WORD    total length of sent buffer
 2Ch    WORD    fragment count
 2Eh  2 WORDs    segment,offset of first fragment buffer
 32h    WORD    length of first fragment buffer
    ...
SeeAlso: #2267

(Table 2282)
Values event service routine is called with:
    ES:SI -> associated ODI ECB (see #2281)
    interrupts disabled
Return: DS,BP,SS,SP preserved
    interrupt disabled
Notes:    the service routine may invoke any IPX/ODI function except CloseSocket
    it is safe to send a packet and wait for completion if enough stack
      space is available
--------N-2FC000-----------------------------
INT 2F - Novell NetWare Event Service Layer (NESL) 1.0 - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        DX:BX -> FAR entry point (see #2283,#2284,#2285,#2286,#2287,#2288)
        ES:SI -> signature string "NESL_EVENTS"
Program: NESL is a generic interface for event handling in ODI drivers and
      other NetWare-oriented modules.  Primarily intended to support
      power management and "hot swapping" of PCMCIA cards, but it is not
      limited to this.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"Link Support Layer",AX=C000h"NETWARN"

(Table 2283)
Call NESL function GetNESLConfigPointer with:
    BX = 0000h
Return: AX = completion code (0000h,8008h) (see #2289)
    ES:SI -> NESL configuration table if successful (see #2290)
    BP,DS,STACK preserved
Desc:    Obtain a pointer to the NESL Configuration Table
SeeAlso: #2284,#2287

(Table 2284)
Call NESL function RegisterEventProducer with:
    BX = 0001h
    ES:SI -> Producer Event Control Block (PECB) (see #2291)
Return: AX = completion code (0000h, 8005h, 8008h) (see #2289)
    ES:SI -> still points to PECB
    BP,DS,STACK preserved
Desc:    Allows a module to register as a producer of a given event class
Note:    PECB_ClassName and PECB_Flags must be filled in on entry
SeeAlso: #2149,#2285,#2286,#2287

(Table 2285)
Call NESL function DeRegisterEventProducer with:
    BX = 0002h
    ES:SI -> PECB previously passed to RegisterEventProducer (see #2291)
Return: AX = completion code (0000h, 8002h, 8008h) (see #2289)
    ES:SI -> still points to PECB
    BP,DS,STACK preserved
Desc:    Allows a module to de-register as a producer of a given event class
SeeAlso: #2284,#2288

(Table 2286)
Call NESL function EventNotification with:
    BX = 0003h
    ES:SI -> PECB previously registered (see #2291)
Return: AX = completion code (0h, 8005h, 8008h) (see #2289)
    ES:SI -> still points to PECB
    BP,DS,STACK preserved
Desc:    Allows a module to signal that an event has just occurred in a given
      event class.
Notes:    Once called, NESL will generate corresponding callouts for this
      event, as described in Table #2293.
    on entry, the PECB_DataPtr must point at an Event Parameter Block (EPB)
      (see #2294) filled in to match the desired event
SeeAlso: #2284

(Table 2287)
Call NESL function RegisterEventConsumer with:
    BX = 0004h
    ES:SI -> Consumer Event Control Block (CECB) (see #2292)
Return: AX = completion code (0h, 8005h, 8008h) (see #2289)
    ES:SI -> still points to CECB
    BP,DS,STACK preserved
Desc:    Allows a module to register as a consumer of a given event class
Note:    on entry, the CECB_ClassName, CECB_NotifProc and CECB_OSILevel must be
      filled in.
SeeAlso: #2284,#2288

(Table 2288)
Call NESL function DeRegisterEventConsumer with:
    BX = 0005h
    ES:SI -> CECB previously passed to RegisterEventConsumer (see #2292)
Return: AX = completion code (0h, 8002h, 8008h) (see #2289)
    ES:SI -> still points to CECB
    BP,DS,STACK preserved
Desc:    Allows a module to de-register as a consumer of a given event class
SeeAlso: #2285,#2287

(Table 2289)
Values for NESL Error code:
 0000h    Successful
 8002h    Bad Parameter
 8005h    Fail
 8008h    Bad Command

Format of NESL Configuration Table:
Offset    Size    Description    (Table 2290)
 00h    WORD    NESL_Cfg_MajVer     Major Version of this table (=1)
 02h    WORD    NESL_Cfg_MinVer     Minor Version of this table (=0)
 04h    DWORD    NESL_Cfg_ModLName   -> ASCIZ long name of NESL module
        (typically -> "NetWare Event Service Layer for 16-Bit DOS")
 08h    DWORD    NESL_Cfg_ModSName   -> ASCIZ short name of NESL module
        (typically -> "NESL")
 0Ch    WORD    NESL_Cfg_ModMajVer  Major Version of NESL itself (=1)
 0Eh    WORD    NESL_Cfg_ModMinVer  Minor Version of NESL itself (=0)

Format of NESL Producer Event Control Block (PECB):
Offset    Size    Description    (Table 2291)
 00h    WORD    PECB_MajVer  Major Version of this structure (=1)
 02h    WORD    PECB_MinVer  Minor Version of this structure (=0)
 04h    DWORD    PECB_NextProducer   -> next PECB.  NULL if last.
 08h    DWORD    PECB_ClassName        -> ASCIZ string identifying event
                      class (see #2295)
 0Ch    DWORD    PECB_ConsumerList   -> list of consumers for this event class
 10h    DWORD    PECB_DataPtr        -> points to additional data during events
 14h    DWORD    PECB_Flags
        Bit 0    =0  consumers should be called "top down" for this
                event class.  (OSI level 7 down to OSI level 1)
            =1  consumers should be called "bottom up"
        Bits 1-31   Reserved =0
 18h  8 BYTEs    PECB_Reserved (all zeros)
Note:    Although the event producer provides the memory for the PECB, the
      NESL module controls this memory until the event class is
      de-registered.
    While owned by NESL, this structure should be treated as read-only,
      except for the PECB_DataPtr field.

Format of NESL Consumer Event Control Block (CECB):
Offset    Size    Description    (Table 2292)
 00h    WORD    CECB_MajVer  Major Version of this structure (=1)
 02h    WORD    CECB_MinVer  Minor Version of this structure (=0)
 04h    DWORD    CECB_NextConsumer   -> next CECB.  NULL if last.
 08h    DWORD    CECB_ClassName        -> ASCIZ string identifying event
                      class (see #2295)
 0Ch    DWORD    CECB_NotifProc        -> FAR CALL event handler (see #2293)
 10h    WORD    CECB_OSILevel
        Bits 4-7 = OSI Layer of this module (1 through 7)
        Bits 0-3 = relative ordering with other modules on same layer
 13h 14 BYTEs    CECB_Reserved (all zeros)
Note:    Although the event consumer provides the memory for the CECB, the
      NESL module controls this memory until the consumer is de-registered.
    While owned by NESL, this structure should be treated as read-only,

(Table 2293)
Values NESL Consumer Notification Procedure is called with:
    ES:SI -> Event Parameter Block (EPB) (see #2294)
Return: AX = completion code (0000h, 8005h) (see #2289)
    ES:SI -> still points to EPB
Desc:    Called by NESL to notify the consumer when an event has occurred in
      an event class for which it has registered.
SeeAlso: #2292

Format of NESL Event Parameter Block (EPB):
Offset    Size    Description    (Table 2294)
 00h    WORD    EPB_MajVer  Major Version of this structure (=1)
 02h    WORD    EPB_MinVer  Minor Version of this structure (=0)
 04h    DWORD    EPB_ClassName  -> ASCIZ string identifying event class
                  (see #2295)
 08h    DWORD    EPB_EventName  -> ASCIZ string identifying event within
                  class (see #2296)
 0Ch    DWORD    EPB_ModuleName -> ASCIZ string identifying module
                  producing event
 10h    DWORD    EPB_DataPtr0   -> event-defined data or NULL if not used
 14h    DWORD    EPB_DataPtr1   -> event-defined data or NULL if not used
 18h  8 BYTEs    EPB_Reserved (all zeros)

(Table 2295)
Values for NESL Event Class Names:
 Event Class        Description
 -------------------    -----------------------------------------
 Service Suspend    Suspension of a service.  Called top-down.
 Service Resume        Resumption/availability of a service. Called bottom-up.
 Service/Status Change    Change in status or level of service.  Called top-down.
 Suspend Request    Request to suspend a service.  Called bottom-up.
Note:    Contact Novell Labs to register new event classes.

(Table 2296)
Values for NESL Event Names:
 Event Name            Class            Description
 --------------------------    -------------        ---------------------------
 MLID Cable Disconnect        Service Suspend        Cable disconnected from NIC
 MLID Card Removal        Service Suspend        PCMCIA card removed
 MLID Hardware Failure        Service Suspend        Serious hardware
                              failure in NIC
 MLID Not In Range        Service Suspend        Wireless access point
                              is out of range
 MLID Shutdown            Service Suspend        MLID was shut down
 MLID Media Access Denied    Service Suspend        Access to physical
                              medium unsuccessful
 MLID Cable Reconnect        Service Resume        Cable re-connected to NIC
 MLID Card Insertion Complete    Service Resume        PCMCIA card inserted
 MLID In Range            Service Resume        Wireless access point
                              in range
 MLID Reset            Service Resume        MLID was just reset
 MLID Access Point Change    Serv/Status Change  Station has moved to
                              new access point
 MLID Speed Change        Serv/Status Change  Change in communic. speed
Note:    Contact Novell Labs to register new event names.
    For all predefined events above, EPB_DataPtr0 (see #2294) points
      to the MLID Configuration table (see AX=C000h"ODI") for the
      affected MLID.
--------N-2FC000-----------------------------
INT 2F - Novell NetWare Connect NETWARN - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        SI = segment of resident portion
Program: NETWARN is a utility supplied with NetWare Connect to warn a
      remote dialup user when programs are about to be loaded slowly over
      the modem link.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    on return, verify that it is NETWARN responding by examining signature
      at in NETWARN's data table in the resident segment (see #2297)
SeeAlso: AX=C000h"ODI",AX=C000h"NESL"

Format of NETWARN Configuration structure:
Offset    Size    Description    (Table 2297)
 103h 7 BYTEs    signature string "NETWARN"
 10Ah    BYTE    major version in ASCII (="1")
 10Bh    BYTE    minor version in ASCII (="0")
 10Ch    DWORD    minimum size of EXE cared about in bytes (/S=xxxx)
 110h    WORD    same value in kilobytes (see #2298 [bit 4])
 112h    BYTE    multiplex code (AH value) actually being used
 113h    WORD    options (see #2298)
 115h    DWORD    INT 21h vector before NETWARN loaded
 119h    DWORD    INT 2Fh vector before NETWARN loaded
 11Dh 16 BYTEs    ASCIIZ local name of last device which was checked
 12Dh 128 BYTEs ASCIIZ remote name of last device which was checked
Note:    the specified offsets are from the start of the resident segment

Bitfields for NETWARN options:
Bit(s)    Description    (Table 2298)
 0    ??? (=0)
 1    /U (Unload) selected (never in resident)
 2    /E (Enabled) Will trap & check EXEC's
 3    /D (Disabled) No EXEC checking done
 4    /S (Size) was set (see #2297 [offsets 010Ch and 0110h])
 5    /P (Path shown)
 6    /H or /? (Help) (never in resident)
SeeAlso: #2297
--------f-2FC000-----------------------------
INT 2F - FN32 32 character filename utilities - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
       ES:DI -> signature string "FN32 32CHAR TSR"
Program: FN32 is a TSR which supports 32 character filenames under PC/MS-DOS
Note:    the TSR intercepts INT 21 calls and performs filename substitution by
      managing dictionary files in each directory which contains long
      filenames
--------M-2FC000-----------------------------
INT 2F - QMR - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        ES:DI -> signature string "QMR1!"
Program: QMR (Cove Software, Quick Mouse Reset) monitors the mouse
      service interrupt (int 33h) and substitutes a fast software
      reset (mouse fn 21h) for the slow hardware reset (mouse fn 0).
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C001h"QMR",AX=C002h"QMR",AX=C003h"QMR"
--------V-2FC000-----------------------------
INT 2F - VGAsave v1.93 - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        BX = segment of resident code
Program: VGAsave is a freeware VGA-specific, mouse-aware screenblanker by Bill
      Javurek
Range:    AH=C0h to AH=FFh, selected by scanning for a free multiplex number
Note:    the transient portion of VGAsave compares the first 38 bytes of the
      resident code (addressed through BX) against its own copy of the
      resident code to complete the installation check
SeeAlso: INT 14/AX=AA01h,INT 2F/AH=93h
Index:    screen saver;VGAsave
--------V-2FC000-----------------------------
INT 2F - AD-DOS - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        BX = 4144h ('AD')
        CX = 2D44h ('-D')
        DX = 4F53h ('OS')
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C001h"AD-DOS",AX=C003h"AD-DOS",AX=C005h"AD-DOS",AX=C007h"AD-DOS"
SeeAlso: AX=C009h"AD-DOS",AX=C020h"AD-DOS",INT 14/AX=AA01h
Index:    screen saver;AD-DOS
--------U-2FC000-----------------------------
INT 2F U - WANG_ER.COM - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        ES = segment of resident code
Program: WANG_ER is a TSR from Compaq which permits Compaq systems equipped
      with 3-mode floppy drives to read Wang document diskettes
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    The installation check is completed by comparing the resident code
      with the copy in the transient program
--------i-2FC000-----------------------------
INT 2F O - ASPIHOOK.SYS - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if multiplex number in use
        ES:DI -> ASCIZ signature "ASPIHOOK" if ASPIHOOK.SYS installed
Program: ASPIHOOK is a device driver for monitoring SCSI activity through an
      ASPI host manager; it is part of the Personal Measure system
      activity monitor from Spirit of Performance, Inc.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"PMEASURE"
--------i-2FC000-----------------------------
INT 2F - PMEASURE.EXE - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if multiplex number in use
        ES:DI -> ASCIZ signature "PMEASURE.EXE" if PMEASURE.EXE installed
Program: PMEASURE.EXE is a TSR for monitoring system hardware activity which
      is part of the Personal Measure system activity monitor from Spirit
      of Performance, Inc.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    If a Personal Measure Hook Module, such as ASPIHOOK.SYS, is already
      installed, PMEASURE.EXE uses the next highest free multiplex number.
SeeAlso: AX=C000h"ASPIHOOK",AX=C000h"PERSONAL MEASURE"
--------i-2FC000-----------------------------
INT 2F - PERSONAL MEASURE - HOOK MODULE INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
    ES:DI -> signature string "PMEASUREHOOK"
    AX = C000 if not installed, per mux id conventions
    DH = major release number (binary)
    DL = minor release number (binary)
Program: The Personal Measure system activity monitor from Spirit of
      Performance, Inc. uses an extensible series of modules to hook
      into various operating system interfaces and monitor system calls.
      Current hook modules are ASPIHOOK.SYS for ASPI device activity
      and CDRHOOK.SYS for non-ASPI CD-ROM activity.     All hook modules
      share the same mux id.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"PMEASURE.EXE",AX=C001h"PERSONAL MEASURE"
--------c-2FC000-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        SI = signature value 20D6h
        DI = signature value 8761h
        ES:BX -> configuration table (see #2299)
        CX = ??? (0300h)
        DX = ??? (0020h)
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=0100h/SI=20D6h,AX=C001h"PCACHE"

Format of PrintCache configuration table:
Offset    Size    Description    (Table 2299)
 00h 26 BYTEs    ASCIZ signature string "TORQ Configuration Table: "
 1Ah  2 BYTEs    ???
 1Ch    DWORD    -> data table (see #2300)
 20h  4 BYTEs    ASCIZ version string ("3.1" for v3.1)
 24h  5 BYTEs    ???
 29h 12 BYTEs    ASCIZ version date string ("Aug 31 1993" for v3.1)
 35h    WORD    buffered port type (01h = LPT, 02h = COM)
 37h    WORD    buffered port BIOS port number
 39h  5 BYTEs    ASCIZ buffered port name ("LPTn" or "COMn")
 3Eh    WORD    physical port type (01h = LPT, 02h = COM)
 40h    WORD    physical port BIOS port number
 42h  5 BYTEs    ASCIZ physical port name ("LPTn" or "COMn")
 47h    BYTE    port driver IRQ
 48h 21 BYTEs    ???
 5Dh    WORD    buffer size in K
 5Fh 27 BYTEs    ???
 7Ah    BYTE    popup hotkey shift states (see #0481 at INT 16/AH=02h)
 7Bh    BYTE    popup hotkey scan code (see #0005 at INT 09"IRQ1")
 7Ch  4 BYTEs    ???
 80h 20 BYTEs    ASCIZ printer type name
    ???

Format of PrintCache data table:
Offset    Size    Description    (Table 2300)
 00h  2 BYTEs    ???
 02h    DWORD    -> ??? entry point
    ???
--------U-2FC000-----------------------------
INT 2F - Frank Kintrup TSR Utilities - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        BX = program ID (see #2301)
        CX = 464Bh (signature "FK")
        DX = revision number (DH = major, DL = minor)
        ES = resident segment of TSR
Range:    AH=C0h to AH=FFh, selected by searching for a free multiplex number
SeeAlso: AX=C001h"Kintrup",AX=C002h"Kintrup"

(Table 2301)
Values for Frank Kintrup TSR program ID:
 4153h    "AS"    ASCII.COM    ASCII table with paste function
 434Ch    "CL"    CLOCK.COM    clock with date/time display and alarm
 5043h    "PC"    PCALC.COM    programmer's calculator with paste function
 5343h    "SC"    SCRSAVE.COM    screen saver with mouse support and hotkey
 5544h    "UD"    UNDEL.COM    undelete program like SMARTCAN or DPROTECT
--------K-2FC000-----------------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if possibly installed
Range:    AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C001h"HP 100LX",AX=C0AEh"HP 100LX",AX=C0AFh"HP 100LX"
--------V-2FC000-----------------------------
INT 2F - DIMWIT - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        ES:DI -> signature string "DIMDOS" or "DIMWIN"
Program: DIMWIT is a freeware Windows-aware screen blanker by Larry Board
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"AD-DOS",AX=C001h"DIMWIT"
Index:    screen saver;DIMWIT
--------F-2FC000BX444B-----------------------
INT 2F - MTEZ XpressFax Hardware TSR (CLASS2) - INSTALLATION CHECK
    AX = C000h
    BX = 444Bh ('DK')
    CX = 4A4Eh ('AN')
Return: AL = status
        00h not installed, OK to install
        FFh installed
        BX = 646Bh ('dk')
        CX = 6A6Eh ('an')
Range:    AH=C0h to AH=FFh, selected automatically
SeeAlso: AH=C0h"MTEZ"
--------V-2FC000-----------------------------
INT 2F U - TSENGP.COM - INSTALLATION CHECK
    AX = C000h
Return: AL = status
        00h not installed, OK to install
        FFh installed
        DS = segment of resident code
Program: TSENGP.COM is a TSR supplied by Compaq to fix an incompatibility
      between some applications and Tseng ET4000-based video adapters
Range:    AH=C0h to AH=FFh, selected automatically
Note:    the installation check is completed by comparing the first eleven
      bytes at DS:005Fh against the TSR's code (80h FCh 06h 74h 0Ah
      80h FCh 07h 74h 05h EAh)
--------N-2FC000-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if one of the components is installed
    CX:BX -> signature within LLRA component:
        "TSI_LapLinkCore" for LLRA1.EXE
        "TSI_Blackbird"   for LLRA2.EXE
        "TSI_Redirector"  for LLRA3.EXE
        "TSI_Compression" for LLRA4.EXE
    DL = major version number
    DH = minor version number
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    LapLink components are installed in the order listed above, but not
      necessarily all four; each gets its own multiplex number (default
      C0h-C3h)
SeeAlso: AX=C002h"LapLink",AX=C205h"LapLink",AX=C2F0h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink",AX=C3F0h"LapLink"
SeeAlso: AX=C3F1h"LapLink"
--------M-2FC001-----------------------------
INT 2F - QMR - REQUEST HARDWARE RESET
    AX = C001h
Return: ES = QMR code segment
    AL destroyed
Desc:    this function is used to force a full mouse reset when QMR is installed
SeeAlso: AX=C000h"QMR",AX=C002h"QMR"
--------V-2FC001-----------------------------
INT 2F - DIMWIT - GET CONFIGURATION DATA
    AX = C001h
Return: ES:DI -> TSR configuration data (see #2302)
Program: DIMWIT is a freeware Windows-aware screen blanker by Larry Board
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"DIMWIT",AX=C001h"AD-DOS"
Index:    screen saver;DIMWIT

Format of DIMWIT TSR configuration data:
Offset    Size    Description    (Table 2302)
 00h    WORD    blanking delay in clock ticks
 02h    BYTE    instant-blanking hotkey scan code (see #0005)
        Ctrl and Alt must also be pressed
--------V-2FC001ES0000-----------------------
INT 2F - AD-DOS - GET RESIDENT CODE SEGMENT
    AX = C001h
    ES = 0000h
Return: AL = 00h if successful
        ES = AD-DOS TSR Code Segment
SeeAlso: AX=C000h"AD-DOS",AX=C001h"DIMWIT"
Index:    screen saver;AD-DOS
--------c-2FC001-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ENTRY POINTS
    AX = C001h
Return: AL = FFh if installed
        ES:BX -> ???
        ES:DX -> ???
        ES:SI -> ???
        ES:DI -> ??? (equivalent to AX=C002h)
SeeAlso: AX=C000h"PCACHE",AX=C002h"PCACHE"
--------U-2FC001-----------------------------
INT 2F - Frank Kintrup TSR Utilities - CLOCK - DISABLE DISPLAY UPDATE
    AX = C001h
Range:    AH=C0h to AH=FFh, selected by searching for a free multiplex number
SeeAlso: AX=C000h"Kintrup",AX=C002h"Kintrup"
--------K-2FC001CX03FB-----------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INTERNAL - UNINSTALL
    AX = C001h
    CX = 03FBh return address to continue uninstall if possible
Return: program uninstalled
Range:    AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C000h"HP 100LX",AX=C0AEh"HP 100LX",AX=C0AFh"HP 100LX"
--------i-2FC001-----------------------------
INT 2F - PERSONAL MEASURE - PASS PARAMETERS TO HOOK MODULE(S)
    AX = C001h
    DX = segment of PMEASURE.EXE or 0000h
    BX = offset in PMEASURE.EXE or 0000h
    CX = offset in PMEASURE.EXE or 0000h
Return: None
Program: PMEASURE.EXE is a TSR for monitoring system hardware activity which
      is part of the Personal Measure system activity monitor from Spirit
      of Performance, Inc.    PMEASURE uses this call to inform its hook
      modules whether or not it is running and to pass information about
      shared data and procedures.
Warning: This information documents a function that is private to Personal
      Measure and is provided as information only.    It should NOT be called
      by any software other than Personal Measure.
SeeAlso: AX=C000h"PERSONAL MEASURE"
--------V-2FC002-----------------------------
INT 2F - AD-DOS - CHECK FOR NEW INPUT
    AX = C002h
Return: AL = 00h if successful
        BX = status
        0000h no input since last check
        0001h new input available
Note:    this call also resets the new-input flag
SeeAlso: AX=C000h"AD-DOS",AX=C004h
Index:    screen saver;AD-DOS
--------M-2FC002-----------------------------
INT 2F - QMR - DISABLE QMR
    AX = C002h
Return: ES = QMR code segment
    AL destroyed
Desc:    this call temporarily disables QMR
SeeAlso: AX=C000h"QMR",AX=C003h"QMR"
--------c-2FC002-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET BUFFER SIZE
    AX = C002h
Return: AX = ??? in K
    BX = size of print buffer in K
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
SeeAlso: AX=C000h"PCACHE"
--------U-2FC002-----------------------------
INT 2F - Frank Kintrup TSR Utilities - CLOCK - ENABLE DISPLAY UPDATE
    AX = C002h
Range:    AH=C0h to AH=FFh, selected by searching for a free multiplex number
SeeAlso: AX=C000h"Kintrup",AX=C002h"Kintrup"
--------N-2FC002-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Core - ???
    AX = C002h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C2F0h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink"
--------V-2FC003-----------------------------
INT 2F - AD-DOS - SET MINUTES TO WAIT
    AX = C003h
    BX = minutes to wait before blanking screen
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    this call also resets the delay timer
SeeAlso: AX=C000h"AD-DOS",AX=C004h
Index:    screen saver;AD-DOS
--------M-2FC003-----------------------------
INT 2F - QMR - ENABLE QMR
    AX = C003h
Return: ES = QMR code segment
    AL destroyed
Desc:    this call enables QMR after it has been disabled
SeeAlso: AX=C000h"QMR",AX=C002h"QMR"
--------c-2FC003-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ??? FLAG
    AX = C003h
Return: BX destroyed
SeeAlso: AX=C004h"PCACHE"
--------V-2FC004-----------------------------
INT 2F - AD-DOS - GET MINUTES TO WAIT
    AX = C004h
Return: AL = 00h if successful
        BX = minutes to wait before blanking screen
SeeAlso: AX=C000h"AD-DOS",AX=C003h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC004-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - CLEAR ??? FLAG
    AX = C004h
Return: BX destroyed
SeeAlso: AX=C003h"PCACHE"
--------V-2FC005-----------------------------
INT 2F - AD-DOS - SET BLANKER STATUS
    AX = C005h
    BX = new state (0000h inactive, 0001h active) (default 0001h)
Return: AL = 00h if successful
SeeAlso: AX=C006h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC005-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C005h
    ???
Return: BX destroyed
    ???
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------V-2FC006-----------------------------
INT 2F - AD-DOS - GET BLANKER STATUS
    AX = C006h
Return: AL = 00h if successful
        BX = current state of screen blanker (0000h inactive, 0001h active)
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"AD-DOS",AX=C005h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC006-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C006h
    ???
Return: BX destroyed
    ???
Note:    this function appears to be identical to AX=C007h
SeeAlso: AX=C000h"PCACHE",AX=C007h"PCACHE"
--------V-2FC007-----------------------------
INT 2F - AD-DOS - SET HOT KEY
    AX = C007h
    BX = hot key
    CL = hot key shift status
Return: AL = 00h if successful
SeeAlso: AX=C008h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC007-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C007h
    ???
Return: BX destroyed
    ???
Note:    this function appears to be identical to AX=C006h
SeeAlso: AX=C000h"PCACHE",AX=C006h"PCACHE"
--------V-2FC008-----------------------------
INT 2F - AD-DOS - GET CURRENT HOT KEY
    AX = C008h
Return: AX = status
        0000h successful
        BX = Hot Key
        CL = Hot Key Shift Status
        0008h otherwise
SeeAlso: AX=C000h"AD-DOS",AX=C007h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC008-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - CLEAR ??? FLAG
    AX = C008h
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C009h"PCACHE"
--------V-2FC009-----------------------------
INT 2F - AD-DOS - UNBLANK MONITOR
    AX = C009h
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    this function works by simulating keyboard activity
Index:    screen saver;AD-DOS
--------c-2FC009-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ??? FLAG
    AX = C009h
Return: BX destroyed
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE",AX=C008h"PCACHE"
--------V-2FC00A-----------------------------
INT 2F - AD-DOS - ???
    AX = C00Ah
Return: AX = status
        0000h successful
        BH = ??
        BL = ??
        000Ah failed
Index:    screen saver;AD-DOS
--------c-2FC00A-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C00Ah
    ???
Return: AH = bit flags
        bit 5: ???
    AL = bit flags
        bit 4: ???
        bit 3: ???
    BX destroyed
    ???
SeeAlso: AX=C000h"PCACHE"
--------V-2FC00B-----------------------------
INT 2F - AD-DOS - ???
    AX = C00Bh
Return: AX = status
        0000h successful
        000Bh failed
Index:    screen saver;AD-DOS
--------c-2FC00B-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - NOP
    AX = C00Bh
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE"
--------V-2FC00C-----------------------------
INT 2F - AD-DOS - SET ??? INTERNAL FLAG TO 01h
    AX = C00Ch
Return: AX = status
        0000h successful
        000Ch failed
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Index:    screen saver;AD-DOS
--------c-2FC00C-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C00Ch
Return: AX = ??? (0000h)
    BX = ??? (0000h)
    CX = ??? (0100h)
    DL = ???
    DH = ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC00D-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ???
    AX = C00Dh
    DL = ???
Return: BX destroyed
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------V-2FC00E-----------------------------
INT 2F - AD-DOS - SET PASSWORD STATUS
    AX = C00Eh
    BX = new state (0000h disabled, 0001h enabled)
Return: ???
SeeAlso: AX=C000h"AD-DOS",AX=C00Fh"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC00E-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - INSTALL ???
    AX = C00Eh
    ES:DX -> ???
Return: BX destroyed
Note:    ES:DX is stored internally if the variable is currently 0000h:0000h,
      but ignored if already set; a counter is incremented
SeeAlso: AX=C000h"PCACHE",AX=C00Fh"PCACHE"
--------V-2FC00F-----------------------------
INT 2F - AD-DOS - GET PASSWORD STATUS
    AX = C00Fh
Return: BX = current state (0000h disabled, 0001h enabled)
SeeAlso: AX=C00Eh"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC00F-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - REMOVE ???
    AX = C00Fh
Return: BX destroyed
Note:    this function decrements the counter used by AX=C00Eh, and clears the
      internal pointer variable to 0000h:0000h when it reaches zero
SeeAlso: AX=C000h"PCACHE",AX=C00Eh"PCACHE"
--------c-2FC010-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C010h
    CX = index of ??? table (00h-02h, others treated as 00h)
    SI = offset into data table
Return: AL = byte at specified offset into table
    BX destroyed
SeeAlso: AX=C000h"PCACHE"
--------c-2FC011-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C011h
Return: AX = ??? (0007h)
    BX = ??? (0001h)
    CH = ???
    CL = ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC012-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C012h
Return: AX = ???
    BX = ???
    CX = ???
    DX = ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC013-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C013h
    ???
Return: BX destroyed
    ???
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------c-2FC014-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C014h
    ???
Return: BX destroyed
    ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC015-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C015h
    ???
Return: BX destroyed
    ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC016-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - INCREMENT ???
    AX = C016h
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C017h"PCACHE"
--------c-2FC017-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - DECREMENT ???
    AX = C017h
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C016h"PCACH"
--------c-2FC018-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C018h
    ???
Return: BX destroyed
    ???
Note:    the first instruction of this function is an indirect jump which points
      at a RET by default
SeeAlso: AX=C000h"PCACHE",AX=C019h"PCACHE"
--------c-2FC019-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C019h
    ???
Return: BX destroyed
    ???
Note:    the first instruction of this function is an indirect jump which points
      at a RET by default
SeeAlso: AX=C000h"PCACHE",AX=C018h"PCACHE"
--------c-2FC01A-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - CLEAR ??? FLAG
    AX = C01Ah
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C01Bh"PCACHE"
--------c-2FC01B-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ??? FLAG
    AX = C01Bh
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C01Ah"PCACHE"
--------c-2FC01C-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C01Ch
    ???
Return: AX = ???
    BX destroyed
SeeAlso: AX=C000h"PCACHE"
--------c-2FC01D-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - NOP
    AX = C01Dh to C01Fh
Return: BX destroyed
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------V-2FC020-----------------------------
INT 2F - AD-DOS - GET AND RESET VxD API STATUS
    AX = C020h
Return: AL = 00h if successful
        BX = VxD API Status
        0000h no error
        0001h error
        0100h neither Windows 3.X enhanced mode nor Windows/386 2.x
              is running
        0200h VM API entry point not found (VxD not installed)
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    this call resets the VxD API Status to zero
SeeAlso: AX=1602h,AX=1607h"CALL OUT API"
Index:    screen saver;AD-DOS
--------V-2FC04E-----------------------------
INT 2F - Explosiv v2.00+ - NON-TSR EXECUTING CHECK
    AX = C04Eh
Return: AL = 4Fh if Explosiv is running but not memory-resident
Program: Explosiv is a shareware animated screen blanker for DOS and Windows 3
      by H&G Software (Reidar Gresseth and Chris Hook)
Range:    AH=C0h to AH=C9h, selected by configuration
SeeAlso: AX=C050h
Index:    screen saver;Explosiv
--------V-2FC050-----------------------------
INT 2F - Explosiv v2.00+ - INSTALLATION CHECK
    AX = C050h
Return: AL = 51h if installed
    ---v3.0+ ---
        BX = interval in clock ticks
        CH = animation display color (00h mono, 01h tinge, 02h color)
        CL = animation delay factor
        DH = animation parameters
        DL = INT 10 checking (00h on, 01h off)
        SI = number of bytes available for animation code
        DI = display type (00h VGA, 01h EGA, 02h CGA, 03h HGC, 04h MDA)
Program: Explosiv is a shareware animated screen blanker for DOS and Windows 3
      by H&G Software (Reidar Gresseth and Chris Hook)
Range:    AH=C0h to AH=C9h, selected by configuration
SeeAlso: AH=93h,AX=C000h"AD-DOS",AX=C04Eh,AX=C052h,AX=C054h"v3"
SeeAlso: INT 14/AX=AA01h
Index:    screen saver;Explosiv
--------V-2FC052-----------------------------
INT 2F - Explosiv v2.00+ - UNINSTALL
    AX = C052h
    DX:BX = address to return to on successful uninstall
Return: at specified address if successful
    AL = 53h on error
Note:    specified return address must have the segment of the caller's PSP
SeeAlso: AX=C050h
Index:    screen saver;Explosiv
--------V-2FC054-----------------------------
INT 2F - Explosiv v2.x - GET ANIMATION DELAY FACTOR
    AX = C054h
Return: AL = delay factor
SeeAlso: AX=C057h
Index:    screen saver;Explosiv
--------V-2FC054-----------------------------
INT 2F - Explosiv v3.0+ - UPDATE PARAMETERS
    AX = C054h
    BX = new interval in clock ticks
    CH = animation display color (00h mono, 01h tinge, 02h color)
    CL = animation delay factor
    DH = animation parameters
    DL = INT 10 checking (00h on, 01h off)
SeeAlso: AX=C050h
Index:    screen saver;Explosiv
--------V-2FC055-----------------------------
INT 2F - Explosiv v2.x - SET BLANKING INTERVAL
    AX = C055h
    BX = new interval in clock ticks
Index:    screen saver;Explosiv
--------V-2FC056-----------------------------
INT 2F - Explosiv v2.x - SET ANIMATION DISPLAY TYPE
    AX = C056h
    BL = animated display type (00h mono, 01h color)
SeeAlso: AX=C058h"v2.x"
Index:    screen saver;Explosiv
--------V-2FC056-----------------------------
INT 2F - Explosiv v3.0+ - ENABLE/DISABLE EXPLOSIV
    AX = C056h
    BX = new state
        0000h disabled
        0100h enabled
        0101h enabled, but never blank
        0102h enabled, always blank
--------V-2FC057-----------------------------
INT 2F - Explosiv v2.x - SET ANIMATION DELAY FACTOR
    AX = C057h
    BL = delay factor
SeeAlso: AX=C054h"v2.x"
Index:    screen saver;Explosiv
--------V-2FC058-----------------------------
INT 2F - Explosiv v2.x - SET ANIMATION PARAMETER
    AX = C058h
    BL = animation parameter
Note:    the animation parameter has different interpretations for each display
SeeAlso: AX=C056h"v2.x"
Index:    screen saver;Explosiv
--------V-2FC058-----------------------------
INT 2F - Explosiv v3.0+ - LOAD NEW ANIMATION DISPLAY CODE
    AX = C058h
    BX = file handle for file containing display code
    CX = number of bytes to load
    DX = offset at which animation code should be loaded
Return: AL = status (see #2303)
Note:    if AL=00h-03h on return, the file will be closed
Index:    screen saver;Explosiv

(Table 2303)
Values for Explosiv function status:
 00h    successful
 01h    code too large to available space
 02h    no data read, load aborted
 03h    incomplete load, default blanking display loaded instead
 58h    unexpected offset in DX
--------V-2FC059-----------------------------
INT 2F - Explosiv v2.x - DISABLE EXPLOSIV
    AX = C059h
Note:    clears flag set by AX=C05Ah
SeeAlso: AX=C05Ah
Index:    screen saver;Explosiv
--------V-2FC05A-----------------------------
INT 2F u - Explosiv v2.x - ENABLE EXPLOSIV
    AX = C05Ah
    BL = ???
Note:    sets flag cleared by AX=C059h then stores BL
SeeAlso: AX=C059h,AX=C05Bh
Index:    screen saver;Explosiv
--------V-2FC05B-----------------------------
INT 2F - Explosiv v2.x - CHANGE ANIMATION DISPLAY
    AX = C05Bh
    BL = animation display
Note:    this function fails silently if the requested display is not in memory
SeeAlso: AX=C05Ah,AX=C05Ch
Index:    screen saver;Explosiv
--------V-2FC05C-----------------------------
INT 2F - Explosiv v2.x - SET INT 10 CHECKING
    AX = C05Ch
    BL = new state of INT 10 checking (00h enabled, 01h disabled)
SeeAlso: AX=C05Bh
Index:    screen saver;Explosiv
--------v-2FC080-----------------------------
INT 2F U - AMI IAM.SYS - INSTALL ??? CALLBACK
    AX = C080h
    CX:DX -> ??? callback
    DI = segment of ??? buffer (first WORD copied into IAM.SYS)
Program: IAM.SYS is the Illegal Activity Monitor portion of American
      Megatrends, Inc.'s PC-Defender anti-virus product
Note:    also sets ??? flag
SeeAlso: AX=C081h

Format of IAM.SYS buffer:
Offset    Size    Description    (Table 2304)
 00h    BYTE    ???
 01h    BYTE    ???
 02h  N BYTEs    ??? (ASCIZ strings)
--------v-2FC081-----------------------------
INT 2F U - AMI IAM.SYS - CLEAR ???
    AX = C081h
Desc:    clears the ??? flag that AX=C080h sets
SeeAlso: AX=C080h
--------K-2FC0AE-----------------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INSTALLATION CHECK
    AX = C0AEh
Return: AX = 4453h if installed
    CX = 5259h if installed
Range:    AH=C0h to AH=FFh, selected by scanning for signature
SeeAlso: AX=C000h"HP 100LX",AX=C001h"HP 100LX",AX=C0AFh"HP 100LX"
--------K-2FC0AF-----------------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INTERNAL - GET BUFFER ADDRESS
    AX = C0AFh
Return: ES:DI -> buffer (behind code)
Range:    AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C000h"HP 100LX",AX=C001h"HP 100LX",AX=C0AEh"HP 100LX"
--------N-2FC100-----------------------------
INT 2F U - Personal NetWare - STPIPX v1.00 - INSTALLATION CHECK
    AX = C100h
Return: AL = FFh if installed
        ES:SI -> signature string "STP-IPX$"
        BX = version??? (0001h for v1.00)
        DI corrupted
Note:    AH=C1h is the default value; STPIPX probably scans a range of
      multiplex numbers to find a free one, as LSL does
SeeAlso: AX=C000h"LSL",AX=C101h
--------N-2FC101-----------------------------
INT 2F U - Personal NetWare - STPIPX v1.00 - UNINSTALL
    AX = C101h
Return: AL = status???
    BX corrupted
SeeAlso: AX=C101h
--------N-2FC205-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Redirector - ???
    AX = C205h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C2F0h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink"
--------N-2FC2F0-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Redirector - ???
    AX = C2F0h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink"
--------N-2FC2F1-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Redirector - ???
    AX = C2F1h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C301h"LapLink"
--------d-2FC300-----------------------------
INT 2F - SETWPR.COM - INSTALLATION CHECK
    AX = C300h
Return: AL = FFh if installed
Program: SETWPR is a hard-disk write-protection TSR by Jaroslaw Rafa
SeeAlso: AX=C302h"SETWPR"
--------k-2FC300DX0000-----------------------
INT 2F U - SpaceManager - INSTALLATION CHECK
    AX = C300h
    DX = 0000h
Return: AL = FFh if any SpaceManager programs installed
        BX = 6F73h
        CX = 6F68h
Program: SpaceManager is an enhancement for MS-DOS DoubleSpace by Vertisoft
      Systems, Inc.
Range:    AH=C3h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C300h/BX=4F53h
--------k-2FC300BX4F53-----------------------
INT 2F U - SpaceManager - INSTALLATION VERIFICATION
    AX = C300h
    BX = 4F53h ('OS')
    CX = 4F48h ('OH')
    DX = program identifier (see #2305) or 0666h for any SpaceManager prog
Return: AL = FFh if BX/CX as specified and specified program installed
        BX = 6F73h ('os')
        CX = 6F68h ('oh')
Range:    AH=C3h to AH=FFh, selected by scanning for first free multiplex number
Note:    this call is chained if BX,CX, or DX are not as specified above
SeeAlso: AX=C300h/DX=0000h

(Table 2305)
Values for SpaceManager program identifier:
 9000h    SMOUNT (SuperMount)
 9001h    SELECTC (SelectCompress)
 9002h    SUPERX (SuperExchange)
 9003h    FORTUNE (FortuneTeller)
--------k-2FC301-----------------------------
INT 2F U - SpaceManager - ???
    AX = C301h
    DX = program identifier (9000h,9001h,9003h) (see #2305)
    ???
Return: ???
--------N-2FC301-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Compression - ???
    AX = C301h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C3F0h"LapLink",AX=C3F1h"LapLink"
--------k-2FC302-----------------------------
INT 2F U - SpaceManager - ENABLE PROGRAM
    AX = C302h
    DX = program identifier (9000h,9001h,9003h) (see #2305)
Return: AX destroyed
SeeAlso: AX=C303h,AX=C306h
--------d-2FC302-----------------------------
INT 2F - SETWPR.COM - SET WRITE-PROTECTION STATE
    AX = C302h
    BL = new state
        00h disk may be written
        01h disk write-protected
Return: AL = FFh if installed
Program: SETWPR is a hard-disk write-protection TSR by Jaroslaw Rafa
SeeAlso: AX=C300h"SETWPR"
--------k-2FC303-----------------------------
INT 2F U - SpaceManager - DISABLE PROGRAM
    AX = C303h
    DX = program identifier (9000h,9001h,9003h) (see #2305)
Return: AX destroyed
SeeAlso: AX=C302h,AX=C306h
--------k-2FC304-----------------------------
INT 2F U - SpaceManager - GET PER-DRIVE ENABLEMENT TABLE
    AX = C304h
    DX = program identifier (9000h,9001h,9003h) (see #2305)
Return: ES:BX -> 26-byte drive table (00h disabled for drive, 01h enabled)
    AX destroyed
--------k-2FC305DX9003-----------------------
INT 2F U - SpaceManager - FORTUNE.EXE - NOP
    AX = C305h
    DX = 9003h
Return: AX destroyed
--------k-2FC305-----------------------------
INT 2F U - SpaceManager - ???
    AX = C305h
    DX = program identifier (9000h,9001h) (see #2305)
    ???
Return: ???
--------k-2FC306-----------------------------
INT 2F U - SpaceManager - CHECK WHETHER PROGRAM ENABLED
    AX = C306h
    DX = program identifier (9000h,9001h,9003h) (see #2305)
Return: AL = current state (00h disabled, FAh enabled)
    AH destroyed
SeeAlso: AX=C302h,AX=C303h
--------k-2FC307DX9001-----------------------
INT 2F U - SpaceManager - SELECTC - ???
    AX = C307h
    DX = 9001h
    BX = ???
    CX = ???
    ???
Return: ???
--------k-2FC308DX9001-----------------------
INT 2F U - SpaceManager - SELECTC - ???
    AX = C308h
    DX = 9001h
    ???
Return: ???
--------N-2FC3F0-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Compression - ???
    AX = C3F0h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C301h"LapLink",AX=C3F1h"LapLink"
--------N-2FC3F1-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Compression - ???
    AX = C3F1h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C301h"LapLink",AX=C3F0h"LapLink"
--------d-2FC64CBX5553-----------------------
INT 2F U - Smart Prompt - INSTALLATION CHECK
    AX = C64Ch
    BX = 5553h
Return: AX = 4CC6h if installed
    BX = 5355h if installed
Program: Smart Prompt (SMARTPMT) is a freeware TSR by Steve Gibson which
      forces an immediate flush of SmartDrive's (and compatible caches')
      buffers on returning to the DOS prompt
--------V-2FC700CX434C-----------------------
INT 2F u - COLAP - INSTALLATION CHECK
    AX = C700h
    CX = 434Ch  "CL"
Return: AL = FFh if installed
Program: colap.com is a freeware TSR by Eric Meyer which controls contrast
      and brightness of color laptops by changing the VGA palette colors;
      for Toshiba laptops there are more hotkeys for shutting off display
      and harddisk.
--------v-2FC900BP0000-----------------------
INT 2F U - ThunderByte??? - INSTALLATION CHECK
    AX = C900h
    BP = 0000h
Return: AL = FFh if installed
        BP >= 0014h
Note:    called by TBSCANX
SeeAlso: AX=C987h,AX=CA00h
--------v-2FC987-----------------------------
INT 2F U - ThunderByte??? - DISINFECT FILE???
    AX = C987h
    BX:DX -> filename
    BX:CX -> virus name
Return: AX = status
        0000h successful???
Note:    called by TBSCANX
SeeAlso: AX=CA00h
--------r-2FC9FF-----------------------------
INT 2F C - StackMan - INSTALLATION BROADCAST
    AX = C9FFh
    BL = BCD version number
    CX = number of stacks
    DX = stack size in bytes
Program: StackMan is a freeware stack manager by Franz Veldman of ESaSS B.V.
      which functions as a replacement for the DOS STACK= command as well
      as permitting multiple TSRs to share a pool of stack space
Notes:    called by StackMan when it goes resident to inform interested TSRs that
      its API is available
    the installation check consists of testing for the string "STACKXXX" at
      offset 0Ah from the INT B4 handler
SeeAlso: INT B4"StackMan",INT B5"StackMan"
Index:    installation check;STACKMAN|broadcasts;STACKMAN installation
--------F-2FCA-------------------------------
INT 2F - FAXPLUS - FAX TSR
    AH = CAh
    ???
Return: ???
Program: FAXTSR is a resident FAX send/receive module for FAXPLUS by Frans
      Veldman
SeeAlso: AH=2Ah"Gammafax"
--------v-2FCA00BX5442-----------------------
INT 2F - TBSCANX - INSTALLATION CHECK
    AX = CA00h
    BX = 5442h ('TB')
Return: AL = state
        00h not installed
        FFh installed
        BX = 7462h ('tb') if BX was 5442h on entry
Program: TBSCANX is a resident virus scanning module by Frans Veldman.
Note:    programs may perform virus checks on themselves, other program files,
      or their data files by invoking the TBSCANX API.
SeeAlso: AX=4653h/CX=0002h,AX=4653h/CX=0007h,AX=C900h
--------v-2FCA01-----------------------------
INT 2F - TBSCANX - GET STATUS
    AX = CA01h
Return: AH = BCD version number (v2.2+)
        CAh for versions before 2.2
    AL = state (00h = disabled, 01h = enabled)
    CX = number of signatures which will be searched
---v2.0---
    BX = EMS handle, 0000h if not using EMS
---v2.3+---
    BX = segment of swap area, 0000h if not swapped
    DX = EMS or XMS handle (XMS handle if BX=0000h), FFFFh if not using EMS
SeeAlso: AX=CA02h
--------v-2FCA02-----------------------------
INT 2F - TBSCANX - SET STATE
    AX = CA02h
    BL = new state (00h = disabled, 01h = enabled)
SeeAlso: AX=CA01h
--------v-2FCA03-----------------------------
INT 2F - TBSCANX - SCAN BUFFER
    AX = CA03h
    CX = size of buffer
    DS:DX -> buffer containing data to scan
Return: CF clear if no virus signatures found
        BX,ES destroyed
    CF set if signature found
        ES:BX -> ASCIZ virus name (v2.3+)
        DS:DX -> ASCIZ virus name (v2.0)
    AX,CX,DX destroyed (v2.3+)
    all other registers except CS:IP and SS:SP destroyed (v2.0)
SeeAlso: AX=CA04h
--------v-2FCA04-----------------------------
INT 2F - TBSCANX - SCAN FILE
    AX = CA04h
    DS:DX -> filename
Return: CF clear if no virus signatures found
        BX,ES destroyed
    CF set if signature found
        ES:BX -> ASCIZ virus name
    AX,CX,DX destroyed
Note:    this function requires at least 4K free memory
SeeAlso: AX=CA03h
--------U-2FCAFEBX0000-----------------------
INT 2F U - THELP v3.0 - INSTALLATION CHECK
    AX = CAFEh
    BX = 0000h
Return: BX = segment of resident code if installed
        0000h if not installed
SeeAlso: AX=5453h,INT 2D"AMIS"
--------F-2FCB00-----------------------------
INT 2F - Communicating Applications Specification - INSTALLATION CHECK
    AX = CB00h
Return: AL = status
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
Note:    AH = CBh is the default identifier, but may be reconfigured
SeeAlso: AH=2Ah,AX=8000h"FaxBIOS",AX=CB0Eh,AX=CBDCh
--------F-2FCB00BX4D53-----------------------
INT 2F - MTEZ XpressFax CASMGR - INSTALLATION CHECK
    AX = CB00h
    BX = 4D53h ('MS')
    CX = 4949h ('II')
Return: AL = status
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
        BX = 6D73h ('ms')
        CX = 6969h ('ii')
Note:    this function is equivalent to the standard CASMGR installation check,
      but uses the additional magic values to identify which CAS is
      installed
SeeAlso: AH=2Ah,AX=8000h"FaxBIOS",AX=C000h/BX=444Bh,AX=CB0Eh,AX=CB16h
--------F-2FCB01-----------------------------
INT 2F - Communicating Applications Specification - SUBMIT A TASK
    AX = CB01h
    DS:DX -> ASCIZ name of task control file
Return: AX >= 0: event handle
    AX < 0: two's complement of error code (see #2306)
Note:    files needed for an event must be kept until task is complete or error
SeeAlso: AX=CB0Bh,AX=CB15h

(Table 2306)
Values for CAS error code:
  (AH = class, AL = subcode, value passed back is 2's complement)
  Class 00h    --- FAX warnings
    Subcode 00h    no error
        02h    bad scanline count
        03h    page sent with errors, could not retransmit
        04h    received data lost
        05h    invalid or missing logo file
        06h    filename does not match nonstandard format (NSF) header
        07h    file size does not match NSF header
  Class 01h    --- DOS warnings (data was sent)
    Subcode 01h    invalid function
        05h    access denied
        06h    invalid handle
        others    see #1020 at INT 21/AH=59h/BX=0000h
  Class 02h    --- fatal errors (data not sent)
    Subcode 00h    multiplex handler failed
        01h    unknown command
        02h    bad event handle
        03h    FIND NEXT attempted before FIND FIRST
        04h    no more events
        07h    invalid queue type
        08h    bad control file
        09h    communication board busy
        0Ah    invalid command parameter
        0Bh    can't uninstall resident code
        0Ch    file exists
        80h    unknown task type
        81h    bad phone number
        82h    bad .PCX file header
        83h    unexpected EOF
        84h    unexpected disconnect
        85h    too many dialing retries
        86h    no file specified for send
        87h    communication board timeout
        88h    received too many pages (>1023) of data
        89h    manual connect initiated too long ago
        8Ah    hardware command set error
        8Bh    bad NonStandard Format (NSF) header file
  Class 03h    --- fatal DOS errors
    Subcode 02h    file not found
        03h    path not found
        others    see #1020 at INT 21/AH=59h/BX=0000h
  Class 04h    --- FAX errors
    Subcode 01h    remote unit not Group 3 compatible
        02h    remote unit did not send capabilities
        03h    other FAX machine incompatible
        04h    other FAX incapable of file transfers
        05h    exceeded retrain or FAX resend limit
        06h    line noise or failure to agree on bit rate
        07h    remote disconnected after receiving data
        08h    no response from remote after sending data
        09h    remote's capabilities incompatible
        0Ah    no dial tone (v1.2+)
        0Bh    invalid response from remote unit after sending data
        0Dh    phone line dead or remote unit disconnected
        0Eh    timeout while waiting for secondary dial tone (v1.2+)
        11h    invalid command from remote after receiving data
        15h    tried to receive from incompatible hardware
        5Ch    received data overflowed input buffer
        5Dh    remote unexpectedly stopped sending data
        5Eh    other FAX machine jammed (no data sent)
        5Fh    remote took too long to send fax scan line
        63h    can't get through to remote unit
        64h    user canceled event
  Class 05h    --- application-specific (v1.2+)
  ---Intel FAXPOP.EXE
    Subcode 00h    tried to send while in graphics mode
        01h    insufficient disk space
        02h    internal buffer overflow
  Class 06h    --- CAS implementation-specific (v1.2+)
--------F-2FCB02-----------------------------
INT 2F - Communicating Applications Specification - ABORT CURRENT EVENT
    AX = CB02h
Return: AX >= 0: event handle of aborted event
    AX < 0: error code (see #2306)
Note:    termination could take up to 30 seconds
SeeAlso: AX=CB08h,AX=CB10h
--------F-2FCB05-----------------------------
INT 2F - Communicating Applications Specification - FIND FIRST QUEUE ENTRY
    AX = CB05h
    CX = status of events to find
        0000h successful completion
        0001h waiting to be processed
        0002h number has been dialed
        0003h connection established, sending
        0004h connection established, receiving
        0005h event aborted
        FFFFh find any event, regardless of status
        other negative values, match error code
    DH = direction
        00h chronological order, earliest to latest
        01h reverse chronological order, latest to earliest
    DL = queue to search
        00h task queue
        01h receive queue
        02h log queue
Return: AX = 0000h successful
        BX = event handle for found event
    AX < 0       error code (see #2306)
SeeAlso: AX=CB06h,AX=CB07h
--------F-2FCB06-----------------------------
INT 2F - Communicating Applications Specification - FIND NEXT QUEUE ENTRY
    AX = CB06h
    DL = queue to search
        00h task queue
        01h receive queue
        02h log queue
Return: AX = 0000h successful
        BX = event handle for found event
    AX < 0       error code (see #2306)
Note:    direction of search is same as preceding FIND FIRST call
SeeAlso: AX=CB05h
--------F-2FCB07-----------------------------
INT 2F - Communicating Applications Specification - OPEN FILE
    AX = CB07h
    BX = event handle from find (AL=05h,06h) or submit task (AL=01h)
    CX = receive file number (ignored for task queue and log queue)
        0000h  open receive control file
        N       open Nth received data file
    DL = queue
        00h task queue
        01h receive queue control file or received file, as given by CX
        02h log queue
        03h group file in task queue (v1.2+)
        04h group file in log queue (v1.2+)
Return: AX = 0000h successful
        BX = DOS file handle for requested file
    AX < 0       error code (see #2306)
Note:    the returned file handle has been opened in read-only mode and should
      be closed with INT 21/AH=3Eh after use
SeeAlso: AX=CB01h,AX=CB05h,AX=CB14h
--------F-2FCB08-----------------------------
INT 2F - Communicating Applications Specification - DELETE FILE
    AX = CB08h
    BX = event handle
    CX = receive file number
        0000h delete ALL received files and receive control file
        N      delete Nth received file
    DL = queue
        00h delete control file in task queue and corresponding group file
          if it exists
        01h delete file in receive queue, as given by CX
        02h delete control file in log queue (individual deletions not
          recommended, to maintain integrity of log) and corresponding
          group file if it exists
Return: AX = 0000h successful
    AX < 0       error code (see #2306)
SeeAlso: AX=CB02h,AX=CB09h
--------F-2FCB09-----------------------------
INT 2F - Communicating Applications Specification - DELETE ALL FILES IN Q
    AX = CB09h
    DL = queue
        00h delete all control files in task queue, including all group
          files
        01h delete all files in receive queue
        02h delete all control files in log queue, including all group
          files
Return: AX = 0000h successful
    AX < 0       error code (see #2306)
SeeAlso: AX=CB08h
--------F-2FCB0A-----------------------------
INT 2F - Communicating Applications Specification - GET EVENT DATE
    AX = CB0Ah
    BX = event handle
    DL = queue
        00h task queue
        01h receive queue
        02h log queue
Return: AX = 0000h successful
        CX = year
        DH = month
        DL = day
    AX < 0       error code (see #2306)
SeeAlso: AX=CB0Bh,AX=CB0Ch
--------F-2FCB0B-----------------------------
INT 2F - Communicating Applications Specification - SET TASK DATE
    AX = CB0Bh
    BX = event handle (task event only)
    CX = year
    DH = month
    DL = day
Return: AX = 0000h successful
    AX < 0       error code (see #2306)
Note:    setting a task's date and time to before the current date and time
      causes it to execute immediately
SeeAlso: AX=CB01h,AX=CB0Ah,AX=CB0Dh
--------F-2FCB0C-----------------------------
INT 2F - Communicating Applications Specification - GET EVENT TIME
    AX = CB0Ch
    BX = event handle
    DL = queue
        00h task queue
        01h receive queue
        02h log queue
Return: AX = 0000h successful
        CH = hour
        CL = minute
        DH = second
        DL = 00h
    AX < 0       error code (see #2306)
SeeAlso: AX=CB0Ah,AX=CB0Dh
--------F-2FCB0D-----------------------------
INT 2F - Communicating Applications Specification - SET TASK TIME
    AX = CB0Dh
    BX = event handle (task events only)
    CH = hour
    CL = minute
    DH = second
    DL unused
Return: AX = 0000h successful
    AX < 0       error code (see #2306)
Note:    setting a task's date and time to before the current date and time
      causes it to execute immediately
SeeAlso: AX=CB0Bh,AX=CB0Ch,AX=CB10h
--------F-2FCB0E-----------------------------
INT 2F - Communicating Applications Specification - GET EXTERNAL DATA BLOCK
    AX = CB0Eh
    DS:DX -> 256-byte buffer for external data block (see #2307)
Return: AX = 0000h successful
        DS:DX buffer filled
    AX < 0       error code (see #2306)

Format of CAS external data block:
Offset    Size    Description    (Table 2307)
 00h    BYTE    CAS major version
 01h    BYTE    CAS minor version
 02h 68 BYTEs    ASCIZ path to directory containing CAS software, ends in slash
 46h 13 BYTEs    ASCIZ name of current phonebook (in CAS directory)
 53h 13 BYTEs    ASCIZ name of current logo file (in CAS directory)
 60h 32 BYTEs    ASCIZ default sender name
 80h 21 BYTEs    ASCIZ CCITT identification of fax device
 95h 107 BYTEs    reserved
--------F-2FCB0F-----------------------------
INT 2F - Communicating Applications Specification - GET/SET AUTORECEIVE
    AX = CB0Fh
    DL = subfunction
        00h get current autoreceive state
        01h set autoreceive state
        DH = number of rings before answer, 00h = never
Return: AX = 0000h autoreceive disabled
    AX = N       number of rings before answer
    AX < 0       error code (see #2306)
--------F-2FCB10-----------------------------
INT 2F - Communicating Applications Specification - GET CURRENT EVENT STATUS
    AX = CB10h
    DS:DX -> 512-byte buffer for status area (see #2309)
Return: AX = 0000h successful
        BX = event handle of current event or negative error code if
              no current event
        buffer filled
    AX < 0       error code (see #2306)
SeeAlso: AX=CB02h,AX=CB0Dh

(Table 2308)
Values for CAS event type:
 00h    send
 01h    receive
 02h    polled send
 03h    polled receive
 04h to 7Fh reserved
 FFh    serious hardware error

Format of CAS status area:
Offset    Size    Description    (Table 2309)
 00h    BYTE    event type (see #2308)
 01h    BYTE    transfer type
        00h 200x200 dpi, FAX mode
        01h 100x200 dpi, FAX mode
        02h file transfer mode
        03h to 7Fh reserved
 02h    WORD    event status (see #2310)
 04h    WORD    event time (packed DOS time format, see INT 21/AX=5700h)
 06h    WORD    event date (packed DOS date format, see INT 21/AX=5700h)
 08h    WORD    number of files to transfer, max 7FFFh
 0Ah    WORD    offset of file transfer record
 0Ch 47 BYTEs    ASCIZ phone number to call
 3Bh 64 BYTEs    ASCIZ application-specific tag string
 7Bh    BYTE    reserved (00h)
 7Ch    BYTE    connect time, seconds
 7Dh    BYTE    connect time, minutes
 7Eh    BYTE    connect time, hours
 7Fh    DWORD    total number of pages in all files
 83h    DWORD    pages already transmitted
 87h    WORD    number of files already transmitted
 89h    BYTE    cover page flag
        00h don't transmit cover page
        01h transmit cover page
        02h to 7Fh reserved
 8Ah    WORD    total number of transmission errors
 8Ch 78 BYTEs    reserved (zeros)
 DAh 21 BYTEs    ASCIZ remote FAX's CCITT identification
 EFH 32 BYTEs    ASCIZ destination name
10Fh 32 BYTEs    ASCIZ sender name
12Fh 80 BYTEs    filename of PCX logo file (max 1780x800 pixels)
17Fh 128 BYTEs    file transfer record for current event (see #2311)

(Table 2310)
Values for CAS event status:
 0000h    completed successfully
 0001h    waiting
 0002h    number dialed
 0003h    connected, sending
 0004h    connected, receiving
 0005h    aborted
 0006h to 007Fh reserved
 0080h to 7FFFh application-specific events
 8000h to FFFFh error codes

Format of CAS file transfer record:
Offset    Size    Description    (Table 2311)
 00h    BYTE    file type (ignored unless FAX)
        00h ASCII
        01h PCX
        02h DCX
        03h to 7Fh reserved
 01h    BYTE    text size for ASCII FAX file
        00h = 80 columns by 66 lines (11 inches)
        01h = 132 columns by 88 lines (11 inches)
        02h to 7Fh reserved
 02h    BYTE    status of file
        00h untouched
        01h opened
        02h moved
        03h deleted
        04h not yet received
        05h to 7Fh reserved
 03h    DWORD    bytes already transmitted
 07h    DWORD    file size in bytes
 0Bh    WORD    pages alread transmitted
 0Dh    WORD    number of pages in file
 0Fh 80 BYTEs    ASCIZ filename
 5Fh    BYTE    1/8 inch page length
        if page length below set to 01h through 7Fh, this value
          specifies additional 1/8 inch increments to page length
 60h    BYTE    page length
        00h = 11 inches
        01h to 7Fh = page length is this number of inches plus value of
              1/8 inch field above
        80h to FEh reserved
        FFh = ASCII pages ending with formfeed
 61h 31 BYTEs    reserved (zeros)
--------F-2FCB11-----------------------------
INT 2F - Communicating Applications Specification - GET QUEUE STATUS
    AX = CB11h
    DL = queue to get status of
        00h task queue
        01h receive queue
        02h log queue
        03h send events (v1.2+)
        04h receive events (v1.2+)
Return: AX >= 0     total number of changes made to queue, modulo 32768
        BX = number of control files currently in queue
        CX = number of received files (zero for task and log queues)
    AX < 0    error code (see #2306)
SeeAlso: AX=CB12h
--------F-2FCB11DL03-------------------------
INT 2F - Communicating Applications Spec v1.2+ - GET NUMBER OF SEND EVENTS
    AX = CB11h
    DL = 03h
Return: AX = number of successful sends since resident manager started
    BX = number of unsuccessful sends, including warnings
SeeAlso: AX=CB11h/DL=04h
--------F-2FCB11DL04-------------------------
INT 2F - Communicating Applications Spec v1.2+ - GET NUMBER OF RECEIVE EVENTS
    AX = CB11h
    DL = 04h
Return: AX = number of received file events since resident manager started
    BX = number of received FAX events
SeeAlso: AX=CB11h/DL=03h
--------F-2FCB12-----------------------------
INT 2F - Communicating Applications Specification - GET HARDWARE STATUS
    AX = CB12h
    DS:DX -> 128-byte status buffer (see #2312,#2314)
Return: AX = 0000h successful
        DS:DX buffer filled with hardware-dependent status information
       < 0       error code (see #2306)
SeeAlso: AX=CB10h,AX=CB11h

Format of status buffer for Intel Connection CoProcessor:
Offset    Size    Description    (Table 2312)
 00h    BYTE    Connection CoProcessor connection status flags (see #2315)
 01h    BYTE    number of kilobytes of free buffer space
 02h    BYTE    page buffer status
        bit 7: Connection CoProcessor has documents to send
        bits 6-0: number of pages in buffer
 03h    BYTE    number of retries left for dialing number
 04h    BYTE    page number to retransmit
 05h    BYTE    communications status (see #2316)
 06h    BYTE    baud rate (see #2313)
 07h  3 BYTEs    reserved
 0Ah    BYTE    Connection CoProcessor hardware status (see #2317)
 0Bh    BYTE    Connection CoProcessor switch states (see #2318)
 0Ch    BYTE    communications flags (see #2319)
 0Dh    BYTE    reserved
 0Eh    WORD    error count (only valid while busy, reset when idle)
 10h    DWORD    size of nonstandard format (NSF) file in bytes
 14h    BYTE    'A' if Connection CoProcessor board present
 15h  9 BYTEs    reserved
 1Eh 21 BYTEs    ASCIZ CCITT identification
 33h 77 BYTEs    reserved
Note:    the Intel Connection CoProcessor and SatisFAXtion may be distinguished
      by examining the byte at offset 14h

Bitfields for Connection CoProcessor baud rate:
Bit(s)    Description    (Table 2313)
 7    reserved
 6-4    baud rate
    000 = 300 baud    (V.21 SDLC or HDLC mode)
    100 = 2400 baud (V.27 ter)
    101 = 4800 baud (V.27 ter)
    110 = 7200 baud (V.29)
    111 = 9600 baud (V.29)
 3-0    reserved, should be 0110

Format of status buffer for Intel SatisFAXtion board:
Offset    Size    Description    (Table 2314)
 00h    BYTE    SatisFAXtion connection status flags (see #2320)
 01h    BYTE    SatisFAXtion board state (see #2321)
 02h    BYTE    number of KB free in buffer
 03h    BYTE    number of pages or files in buffer
 04h    BYTE    number of redials remaining on current number
 05h    BYTE    FAX page number to retransmit
 06h    BYTE    current page/file in block transfer
 07h    BYTE    number of rings received (only if auto-answer enabled)
 08h    WORD    error count
 0Ah    DWORD    length of file being transferred
 0Eh  6 BYTEs    reserved
 14h    BYTE    'B' if SatisFAXtion board present
 15h 13 BYTEs    ASCIZ transfer agent name
 22h  5 BYTEs    ASCIZ transfer agent version number
 27h 13 BYTEs    ASCIZ resident loader name
 34h  5 BYTEs    ASCIZ resident loader version number
 39h 21 BYTEs    ASCIZ remote CSID
 4Eh 13 BYTEs    ASCIZ resident manager name
 5Bh  5 BYTEs    ASCIZ resident manager version number
 60h 32 BYTEs    reserved
Note:    the Intel Connection CoProcessor and SatisFAXtion may be distinguished
      by examining the byte at offset 14h

Bitfields for Connection CoProcessor connection status flags:
Bit(s)    Description    (Table 2315)
 7    hardware busy sending or receiving
 6    last page of data
 5    no data on current page
 4    retransmit request for current page being transmitted
 3    NSF (nonstandard file) mode active
 2-0    reserved

Bitfields for communications status:
Bit(s)    Description    (Table 2316)
 7    originating call
 6    FAX message to be sent
 5    on line
 4    ring detected and receive enabled
 3    buffer dumped on receive
 2-0    hardware sequence state
    000 idle
    001 dial
    010 answer
    011 transmit
    100 receive
    101 pre-message
    110 post-message
    111 disconnect

Bitfields for Connection CoProcessor hardware status:
Bit(s)    Description    (Table 2317)
 7    modem option installed
 6    Connection CoProcessor has control of DAA (not latched)
 5    on line (not latched)
 4    ring detected (not latched)
 3    data in command buffer (not latched)
 2    set if using DMA channel 1, clear if using DMA channel 3
 1    line length compensation 1 set (not latched)
 0    line length compensation 0 set (not latched)

Bitfields for Connection CoProcessor switch states:
Bit(s)    Description    (Table 2318)
 7    reserved
 6    unused
 5    spare switch open
 4    FAX ADR1 switch open
 3    FAX ADR0 switch open
 2    alternate interrupt switch open
 1    COM SEL 1 switch open
 0    COM SEL 0 switch open
Note:    valid combinations of 0-2 are
    000  COM2 IRQ3 IObase 2F8h
    001  COM1 IRQ4 IObase 3F8h
    010  COM4 IRQ3 IObase 2E8h
    011  COM3 IRQ4 IObase 3E8h
    110  COM4 IRQ2 IObase 2E8h
    111  COM3 IRQ5 IObase 3E8h

Bitfields for communications flags:
Bit(s)    Description    (Table 2319)
 7    reserved
 6    auxiliary relay forced ON
 5    modem select relay forced ON
 4    offhook relay forced ON
 3    9600 bps enabled
 2    7200 bps enabled
 1    4800 bps enabled
 0    2400 bps enabled

Bitfields for SatisFAXtion connection status flags:
Bit(s)    Description    (Table 2320)
 7    busy in T.30 CCITT fax protocol
 6    data on current page/file (only used for block xfers)
 5    retransmission of last page requested
 4    in file transfer mode
 3    data in buffer
 2    data buffer dumped on receive
 1    200x100 dpi resolution instead of 200x200 dpi
 0    data modem in use, FAX image modem not available

Bitfields for SatisFAXtion board state:
Bit(s)    Description    (Table 2321)
 7    reserved
 6    handset jack active, data and FAX modems not available
 5-3    current rate
    000  300 bps (V.21 HDLC)
    100 2400 bps (V.27 ter)
    101 4800 bps (V.27 ter)
    110 7200 bps (V.29)
    111 9600 bps (V.29)
 2-0    T.30 CCITT protocol state
    000 idle
    001 dialing
    010 answering
    011 transmitting
    100 receiving
    101 pre-message
    110 post-message
    111 disconnect
--------F-2FCB13DL00-------------------------
INT 2F - Communicating Applications Specification - GET DIAGNOSTICS RESULTS
    AX = CB13h
    DL = 00h
Return: AX = 0040h in progress
       >= 0       passed
       < 0       hardware-dependent failure code (see #2322,#2323)
SeeAlso: AX=CB13h/DL=01h

Bitfields for Intel Connection CoProcessor failure codes:
Bit(s)    Description    (Table 2322)
 3    9600 bps FAX modem module failed
 2    SDLC chip failed
 1    RAM failed
 0    ROM checksum failed

Bitfields for Intel SatisFAXtion failure codes:
Bit(s)    Description    (Table 2323)
 1    2400 bps data modem failed
 0    9600 bps FAX modem failed
--------F-2FCB13DL01-------------------------
INT 2F - Communicating Applications Specification - START DIAGNOSTICS
    AX = CB13h
    DL = 01h
Return: AX = 0000h successfully started
    AX < 0       error code (see #2306)
SeeAlso: AX=CB13h/DL=00h
--------F-2FCB14-----------------------------
INT 2F - Communicating Applications Specification - MOVE RECEIVED FILE
    AX = CB14h
    BX = event handle
    CX = receive file number
        0001h first received file
        N      Nth received file
    DS:DX -> ASCIZ string specifying new name for file (must not exist)
Return: AX = 0000h successful
    AX < 0       error code (see #2306)
--------F-2FCB15-----------------------------
INT 2F - Communicating Applications Specification - SUBMIT FILE TO SEND
    AX = CB15h
    DS:DX -> variable-length data area (see #2324)
Return: AX >= 0 event handle
    AX < 0    error code (see #2306)
SeeAlso: AX=CB01h

Format of CAS file submission data area:
Offset    Size    Description    (Table 2324)
 00h    BYTE    transfer type
        00h = 200x200 dpi, fax mode
        01h = 100x200 dpi, fax mode
        02h = file transfer mode
        03h to 7Fh reserved
 01h    BYTE    text size
        00h = 80 columns
        01h = 132 columns
        02h to 7Fh reserved
 02h    WORD    time to send (DOS packed time, see #1005 at INT 21/AX=5700h)
 04h    WORD    date to send (DOS packed date, see #1006 at INT 21/AX=5700h)
 06h 32 BYTEs    ASCIZ destination name
 26h 80 BYTEs    ASCIZ name of file to send
 76h 47 BYTEs    ASCIZ phone number to dial
 A5h 64 BYTEs    ASCIZ application-specific tag string
 E5h    BYTE    reserved (00h)
 E6h    BYTE    cover page
        00h don't send cover page
        01h send cover page
        02h to 7Fh reserved
 E7h 23 BYTEs    reserved (zeros)
 FEh variable    ASCIZ string containing text of cover page (if cover page flag
        set to 01h)
--------F-2FCB16BX1234-----------------------
INT 2F - Communicating Applications Spec v1.2+ - UNLOAD RESIDENT MANAGER
    AX = CB16h
    BX = 1234h
    CX = 5678h
    DX = 9ABCh
Return: AX = 0000h successful
    AX < 0       error code
Note:    the MTEZ XpressFax CASMGR ignores the values in BX,CX, and DX
SeeAlso: AX=C000h/BX=444Bh,AX=CB00h
Index:    uninstall;CAS Manager
--------F-2FCB17-----------------------------
INT 2F - Communicating Applications Spec v1.2+ - SET COVER PAGE STATUS
    AX = CB17h
    BX = event handle
    CL = cover page status
        00h not read
        01h read by user
Return: AX = 0000h successful
    AX < 0       error code
--------F-2FCB80-----------------------------
INT 2F - Intel SatisFAXtion CASMGR - ???
    AX = CB80h
    ???
Return: ???
--------F-2FCB81-----------------------------
INT 2F - Intel SatisFAXtion CASMGR - ???
    AX = CB81h
    ???
Return: ???
--------F-2FCB82-----------------------------
INT 2F - Intel SatisFAXtion CASMGR - ???
    AX = CB82h
    ???
Return: ???
--------F-2FCBDCBL56-------------------------
INT 2F - Comwave Microfax Specification - GET STATUS ARRAY
    AX = CBDCh
    BL = 56h
    BH = line number (starts with 1)
    CX:DX -> 32-byte status buffer or 80 character string
Return: AX = number of cards installed, or FFFFh on error
Program: Comwave manufacturers the Microfax line of fax cards which are a
      high-performance multi-card FAX solution for OEMs.
Note:    defaults to AH=CBh but can be changed
SeeAlso: AX=CBDDh,AX=DA00h
--------F-2FCBDDBL56-------------------------
INT 2F - Comwave Microfax Specification - COMMAND SUBMISSION
    AX = CBDDh
    BL = 56h
    BH = ?
    CX:DX -> command to execute
Return: AX = status
        0000h success
        FFFFh on error
SeeAlso: AH=2Ah,AX=CBDCh,AX=80FBh
--------c-2FCC--SI5453-----------------------
INT 2F U - PC-Kwik Programs - API
    AH = CCh
    SI = 5453h or 7473h
    AL = function number (at least 00h,01h,04h,05h,07h,80h)
    DL = program identifier (see #2325)
Return: SI = 7473h
    other registers vary by function
Note:    Qualitas Qcache v4.00 is an OEM version of Super PC-Kwik v4.00, and
      thus supports this call
SeeAlso: INT 21/AH=2Bh/CX=4358h

(Table 2325)
Values for PC-Kwik program identifier:
 00h    all installed PowerPak programs
 01h    SUPERPCK/SUPER/QCACHE v4.00+ (disk cache)
 02h    PCKSPL (print spooler)
 04h    PCKSCRN (screen accelerator)
 05h    PCKKEY (keyboard enhancer)
 06h    PCKRAMD (RAM disk)
 08h    PCKWIK.SYS
 10h    PCKCDROM (CD-ROM support for SUPERPCK)
--------N-2FCC00-----------------------------
INT 2F - Tsoft NFSDRVR - INSTALLATION CHECK
    AX = CC00h
Return: AX = 7777h
    BX = ???
    CX = ???
    DX = ???
    ES = data segment of resident portion
SeeAlso: AX=CC01h,AX=CC06h
--------N-2FCC01-----------------------------
INT 2F - Tsoft NFSDRVR - ???
    AX = CC01h
    ???
Return: ???
SeeAlso: AX=CC00h
--------N-2FCC02-----------------------------
INT 2F - Tsoft NFSDRVR - ???
    AX = CC02h
    ???
Return: ???
SeeAlso: AX=CC00h
--------N-2FCC03-----------------------------
INT 2F - Tsoft NFSDRVR - ???
    AX = CC03h
    ???
Return: ???
SeeAlso: AX=CC00h
--------N-2FCC04-----------------------------
INT 2F - Tsoft NFSDRVR - ???
    AX = CC04h
    ???
Return: ???
SeeAlso: AX=CC00h
--------N-2FCC05-----------------------------
INT 2F - Tsoft NFSDRVR - ???
    AX = CC05h
    ???
Return: ???
SeeAlso: AX=CC00h
--------N-2FCC06-----------------------------
INT 2F - Tsoft NFSDRVR - ???
    AX = CC06h
    ???
Return: ???
SeeAlso: AX=CC00h
--------P-2FCD00-----------------------------
INT 2F - Intel Image Processing Interface - INSTALLATION CHECK
    AX = CD00h
Return: AL = state
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
SeeAlso: AX=CD02h"Image"
--------P-2FCD00-----------------------------
INT 2F - LaserPort Interface - INSTALLATION CHECK
    AX = CD00h
Return: AL = status
        FFh installed
SeeAlso: AX=CD0Fh"LaserPort"
--------U-2FCD00-----------------------------
INT 2F - SWELL.EXE - INSTALLATION CHECK
    AX = CD00h
Return: AX = 00FFh installed
        BH = major version
        BL = minor version
Program: SWELL.EXE is a TSR which swaps programs to disk when they EXEC a
      child process with INT 21/AH=4Bh
--------s-2FCD00BX464F-----------------------
INT 2F - Forte/Gravis ULTRAMID - INSTALLATION CHECK
    AX = CD00h
    BX = 464Fh ('FO')
    CX = 5254h ('RT')
    DX = 4520h ('E ')
Return: AL = FFh if installed
        BX = 4155h ('AU')
        CX = 4449h ('DI')
        DX = 4F20h ('O ')
        ES:SI -> program ID string
Program: ULTRAMID is a MIDI driver for the Gravis UltraSound which allows use
      of AIL drivers with other software
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
SeeAlso: INT 21/AX=FD12h,AX=CD00h/DX=4957h
--------s-2FCD00DX4957-----------------------
INT 2F R - InterWave Game API - INSTALLATION CHECK
    AX = CD00h
    DX = 4957h ('IW')
    SI = 5645h ('VE')
Return: AL = FFh if installed
        DX = 4554h ('ET')
        SI = 454Bh ('EK')
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
SeeAlso: AX=CD00h/BX=464Fh,AX=CD01h"InterWave",AX=CD21h"InterWave"
SeeAlso: AX=CD80h"InterWave"
--------P-2FCD01-----------------------------
INT 2F - Intel Image Processing Interface - SET DEVICE NAME
    AX = CD01h
    CX:BX -> ASCIZ character device name ("LPTn", "COMn", "PRN")
Return: AL = status
        00h successful
        CX:BX -> internal character device name
        80h error
--------U-2FCD01-----------------------------
INT 2F - SWELL.EXE - SUSPEND ONCE
    AX = CD01h
Return: AX = 0000h
SeeAlso: AX=CD02h"SWELL"
--------s-2FCD01BX0000-----------------------
INT 2F R - InterWave Game API - GET NUMBER OF INTERWAVE PROGRAMS / PROGRAM ID
    AX = CD01h
    BX = 0000h
Return: BX = number of programs currently installed on the Game API
Desc:    get the number of programs supporting the InterWave Game API which are
      currently installed in memory, which also forms the next program ID
      number if the caller wishes to go resident on the API
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
Notes:    the first program to install on the IW Game API must use ID 00h
    the AMD-recommended implementation is for the handler to increment
      BX and chain to the previous handler (if any), but this will fail
      if TSRs are unloaded out-of-order
SeeAlso: AX=CD00h"InterWave",AX=CD02h"InterWave",AX=CD03h"InterWave"
SeeAlso: AX=CD05h"InterWave",AX=CD21h"InterWave",AX=CD80h"InterWave"
--------P-2FCD02-----------------------------
INT 2F - Intel Image Processing Interface - GET VERSION NUMBER
    AX = CD02h
Return: AL = status
        00h/01h successful
        BH = major version number (BCD)
        BL = minor version number (BCD)
        80h error
Note:    if return AL = 01h, the IPI supports network redirection
SeeAlso: AX=CD00h"Image"
--------U-2FCD02-----------------------------
INT 2F - SWELL.EXE - SUSPEND
    AX = CD02h
Return: AX = 0000h
SeeAlso: AX=CD03h"SWELL"
--------s-2FCD02-----------------------------
INT 2F R - InterWave Game API - GET PROGRAM STATUS AND INFORMATION
    AX = CD02h
    BX = program identifier
Return: CX = program status
        bit 0: using synthesizer
        bit 1: using Codec
        bit 2: supports at least one Game Device (see AX=CD21h,AX=CD22h)
    BX = supported API version (BCD, BH=major, BL=minor) if CX bit 2 set
    ES:DI -> ASCIZ identification string
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
Note:    ordinarily, an application will loop through all valid program
      identifiers (as returned by AX=CD01h); if any of the installed
      programs conflicts with the use the caller wishes to make of the
      InterWave chip, it should be disabled with AX=CD03h first
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD03h"InterWave"
SeeAlso: AX=CD05h"InterWave",AX=CD21h"InterWave",AX=CD80h"InterWave"
--------P-2FCD03-----------------------------
INT 2F - Intel Image Processing Interface - SELECT SCAN LINE
    AX = CD03h
    BX = scan line
    CX = requested density in dots per inch (300, 600, or 1200)
Return: AL = status (see also AX=CD04h"Image")
        00h successful
        CX = density at which scan line was mapped
        ES:DI -> start of scan line
        80h unsuccessful
        81h scan line out of range
        82h unsupported scan line density
        83h out of memory
SeeAlso: AX=CD04h"Image"
--------U-2FCD03-----------------------------
INT 2F - SWELL.EXE - ACTIVATE
    AX = CD03h
Return: AX = 0000h
SeeAlso: AX=CD02h"SWELL"
--------s-2FCD03-----------------------------
INT 2F R - InterWave Game API - SUSPEND PROGRAM
    AX = CD03h
    BX = installed program identifier
    CX = InterWave section to be released
        0000h all
        0001h synthesizer
        0002h Codec
Return: AL = status
        00h successful
        BX = base port
        CL = IRQ
        CH = DMA channel (Codec only)
        else failed
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD02h"InterWave"
SeeAlso: AX=CD04h"InterWave",AX=CD21h"InterWave",AX=CD80h"InterWave"
--------P-2FCD04-----------------------------
INT 2F - Intel Image Processing Interface - MOVE BITMAP TO SCANLINE
    AX = CD04h
    CX:BX -> structure (see #2327)
Return: AL = status (see #2326)
SeeAlso: AX=CD03h"Image"

(Table 2326)
Values for IPI function status:
 00h    successful
 80h    unsuccessful
 81h    scan line out of range
 82h    unsupported scan line density
 83h    out of memory
 84h    unrecognized source
 85h    initialization error

Format of structure:
Offset    Size    Description    (Table 2327)
 00h    WORD    image source (0 = conventional memory, 1 = expanded memory)
 02h    DWORD    pointer to image data
 06h    WORD    scan line on which to place
 08h    WORD    bit offset from start of scan line at which to place
 0Ah    WORD    density of bitmap data (300, 600, or 1200 dpi)
 0Ch    WORD    width in bits of data
 0Eh    WORD    source logical page number
 10h    WORD    source handle (only if source in expanded memory)
 12h    WORD    source offset (only if source in expanded memory)
--------U-2FCD04-----------------------------
INT 2F - SWELL.EXE - TURN OFF VERBOSE MODE
    AX = CD04h
Return: AX = 0000h
SeeAlso: AX=CD05h"SWELL"
--------s-2FCD04-----------------------------
INT 2F R - InterWave Game API - WAKE PROGRAM
    AX = CD04h
    BX = installed program identifier
Return: AL = status
        00h successful
        else failed
Note:    this function should only be called after the program has been
      suspended with AX=CD03h
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD03h"InterWave"
SeeAlso: AX=CD05h"InterWave",AX=CD21h"InterWave",AX=CD80h"InterWave"
SeeAlso: INT 7E/AL=84h"IWSBSDRV"
--------P-2FCD05-----------------------------
INT 2F - Intel Image Processing Interface - PRINT PAGE
    AX = CD05h
Return: AL = status (00h,80h) (see #2326)
Note:    page image is retained, so multiple calls will print multiple copies of
      the page
SeeAlso: AX=CD06h"Image"
--------U-2FCD05-----------------------------
INT 2F - SWELL.EXE - TURN ON VERBOSE MODE
    AX = CD05h
Return: AX = 0000h
SeeAlso: AX=CD04h"SWELL"
--------s-2FCD05-----------------------------
INT 2F R - InterWave Game API - UNINSTALL RESIDENT DEVICE DRIVER
    AX = CD05h
    BX = installed program identifier
Return: AL = status
        00h successful
        else failed
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD02h"InterWave"
SeeAlso: AX=CD03h"InterWave",AX=CD21h"InterWave",AX=CD80h"InterWave"
--------P-2FCD06-----------------------------
INT 2F - Intel Image Processing Interface - CLEAR PAGE
    AX = CD06h
Return: AL = status (00h,80h) (see #2326)
Note:    palette is reset to default
SeeAlso: AX=CD09h"Image"
--------U-2FCD06-----------------------------
INT 2F - SWELL.EXE - UNINSTALL
    AX = CD06h
Return: AX = status
        0000h uninstalled
        8002h programs still swapped, not uninstalled
--------P-2FCD07-----------------------------
INT 2F - Intel Image Processing Interface - reserved
    AX = CD07h
SeeAlso: AX=CD00h"Image"
--------U-2FCD07-----------------------------
INT 2F - SWELL.EXE - GET INFO
    AX = CD07h
    ES:BX -> 32-byte buffer for info (see #2328)
Return: AX = status
        0000h successful
        ES:BX buffer filled
        8001h buffer wrong size

Format of SWELL.EXE info buffer:
Offset    Size    Description    (Table 2328)
 00h    WORD    20h  (total size of buffer)
 02h    BYTE    suspend-once mode active if nonzero
 03h    BYTE    00h active, 01h suspended
 04h    BYTE    00h quiet, 01h verbose
 05h    BYTE    "Borland support" (allowing INT 21/AX=4B01h) on if nonzero
 06h 26 BYTEs    unused???
--------P-2FCD08-----------------------------
INT 2F - Intel Image Processing Interface - SCREEN IMAGE
    AX = CD08h
    CX:BX -> structure (see #2329)
Return: AL = status (00h,80h-85h) (see #2326)
SeeAlso: AX=CD05h"Image",AX=CD09h"Image"

Format of IPI screen image structure:
Offset    Size    Description    (Table 2329)
 00h    WORD    image source (0 = conventional memory, 1 = expanded memory)
 02h    DWORD    pointer to image data
 06h    WORD    horizontal position on paper of left edge (in 1200 dpi units)
 08h    WORD    vertical position on paper of top edge (in 1200 dpi units)
 0Ah    WORD    left cropping (currently must be zero)
 0Ch    WORD    top cropping (currently must be zero)
 0Eh    WORD    width (currently must be 8000h)
 10h    WORD    height (currently must be 8000h)
 12h    WORD    horizontal size of image in 1200 dpi units
 14h    WORD    vertical size of image in 1200 dpi units
 16h    WORD    aspect ratio (currently reserved)
 18h    WORD    initialization flag (if 01h, initialization is performed)
 1Ah    WORD    pixels per line of source data
 1Ch    WORD    number of scan lines in source data
 1Eh    WORD    number of scan lines in packet
 20h    WORD    bits per pixel (1,2,4,6, or 8)
 22h    WORD    pixels per byte (1,2,4, or 8)
 24h    WORD    compression type (currently only 00h [uncompressed] supported)
 26h    WORD    source page number (if in expanded memory)
 28h    WORD    source handle (if in expanded memory)
 2Ah    WORD    source offset (if in expanded memory)
--------U-2FCD08-----------------------------
INT 2F - SWELL.EXE - UNUSED
    AX = CD08h
Return: AX = FFFFh (error)
--------P-2FCD09-----------------------------
INT 2F - Intel Image Processing Interface - LOAD SCREEN
    AX = CD09h
    CX:BX -> structure (see #2330)
Return: AL = status (00h,80h) (see #2326)
SeeAlso: AX=CD06h"Image Processing",AX=CD0Ah"Image Processing"

Format of IPI load screen structure:
Offset    Size    Description    (Table 2330)
 00h    BYTE    style
        44h ('D') diamond style
        4Ch ('L') line style
 01h    BYTE    reserved (00h)
 02h    WORD    frequency in lines per inch [sic]
        currently, coerced to nearest of 50, 60, 68, 70, 75, 85, or 100
 04h    WORD    screen angle in degrees (-360 to 360)
        currently coerced to nearest of -45, 0, 45, or 90
--------U-2FCD09-----------------------------
INT 2F - SWELL.EXE - TURN OFF "BORLAND SUPPORT"
    AX = CD09h
Return: AX = 0000h
SeeAlso: AX=CD0Ah"SWELL"
--------P-2FCD0A-----------------------------
INT 2F - Intel Image Processing Interface - LOAD PALETTE
    AX = CD0Ah
    CX:BX -> palette structure (see #2331)
Return: AL = status (00h,80h) (see #2326)
SeeAlso: AX=CD09h"Image Processing"

Format of IPI palette structure:
Offset    Size    Description    (Table 2331)
 00h    BYTE    bits per pixel for which palette is to be used (1,2,4,6, or 8)
 01h    2**N    palette translation values, one per possible pixel value
--------U-2FCD0A-----------------------------
INT 2F - SWELL.EXE - TURN ON "BORLAND SUPPORT"
    AX = CD0Ah
Return: AX = 0000h
SeeAlso: AX=CD09h"SWELL"
--------P-2FCD0F-----------------------------
INT 2F - LaserPort Interface - EXECUTE FUNCTION
    AX = CD0Fh
    BL = function
        01h enable
        02h disable
        03h ???
Return: AL = status
        00h success
SeeAlso: AX=CD00h"LaserPort"
--------s-2FCD21-----------------------------
INT 2F R - InterWave Game API - OPEN GAME DEVICE
    AX = CD21h
    BX = installed program identifier
    ES:DI -> ASCIZ device name
        "MIDISIMPLE"
        "MIDICOMPLEX"
        "DIRECTCODEC"
Return: AL = status
        00h successful
        DX = device handle
        ---MIDISIMPLE and MIDICOMPLEX---
        BX = real-mode interrupt number (see #3323,#3324)
        ---DIRECTCODEC---
        BX = base port
        CL = IRQ
        CH = DMA channel (04h = no DMA)
        SI = size of FIFO in bytes (0000h = use DMA)
        nonzero failed (not supported or already in use)
    AH may be destroyed
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD02h"InterWave"
SeeAlso: AX=CD05h"InterWave",AX=CD22h"InterWave",AX=CD80h"InterWave"

(Table 3323)
Call MIDISIMPLE with:
    EAX = function number
        0001h MIDI byte out
        BL = MIDI byte to send
        0002h MIDI string out
        ECX = length of MIDI string in bytes
        ES:EDI -> MIDI string to send (should not include timing info)
    DX = device handle
    INT xxh (as returned by AX=CD21h)
Return: EAX = status
        00000000h if successful
        FFFFFFFFh on error (bad handle)
SeeAlso: #3324,INT 7E/AX=0001h"IWSBSDRV",INT 7E/AX=0002h"IWSBSDRV"

(Table 3324)
Call MIDICOMPLEX with:
    EAX = function number
        ??? (specification is still in development)
    DX = device handle
    INT xxh (as returned by AX=CD21h)
Return: EAX = status
        00000000h if successful
        FFFFFFFFh on error (bad handle)
SeeAlso: #3323
--------s-2FCD22-----------------------------
INT 2F R - InterWave Game API - CLOSE GAME DEVICE
    AX = CD22h
    BX = installed program identifier
    DX = device handle (from AX=CD21h)
Return: AL = status
        00h successful
        FFh inavlid handle or device is not open
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD02h"InterWave"
SeeAlso: AX=CD05h"InterWave",AX=CD21h"InterWave",AX=CD80h"InterWave"
--------s-2FCD80-----------------------------
INT 2F RC - InterWave Game API - MIXER SETTINGS CHANGED BROADCAST
    AX = CD80h
Return: nothing
Desc:    called by an application controlling the InterWave chip's mixer
      whenever the mixer's settings are changed
Range:    AH=CDh-ECh, selected by scanning for an available multiplex number
Note:    when an application intercepts this function call, it must read the
      new mixer settings from the InterWave chip
SeeAlso: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD02h"InterWave"
SeeAlso: AX=CD05h"InterWave",AX=CD21h"InterWave",AX=CD22h"InterWave"
--------K-2FCF00-----------------------------
INT 2F - TEMPLEXX 1.0 - INSTALLATION CHECK
    AX = CF00h
Return: AL = FFh if installed
Program: TEMPLEXX is a popup keyboard template by Henson Scientific, Inc.
Note:    values in AL other than 00h cause an immediate return without modifying
      any registers
--------G-2FD000-----------------------------
INT 2F C - MDEBUG display driver - GET DRIVER STATUS
    AX = D000h
Return: CF set on error
        all other registers must be unchanged)
    CF clear if successful
        AL = FFh
        AH = driver semaphor
        00h driver is not active
        01h driver is active
        BX = CS of the driver
        CX = driver version (CH = major, CL = minor, must be >= 013Ch)
        DL = buffer semaphor
        00h driver is not pending
        01h driver is pending between functions 02h and 03h
        DH = show semaphor
        00h driver is not pending
        01h driver is pending between functions 04h and 05h
Program: MDEBUG is a shareware memory-resident debugging tool by Bernd
      Schemmer, including a memory monitor, an interpreter and a
      disassembler
Range:    AH=C0h to AH=FFh, selected by switch or programmatically
Notes:    MDEBUG can use any two consecutive multiplex numbers between C0h and
      FFh; the default is D0h for the display driver and D1h for the
      command driver (call INT 60/AH=00h"MDEBUG" for the actual multiplex
      numbers used)
    this function MUST be reentrant, as MDEBUG calls it after every popup
      before any other actions.  The handler should not change any
      registers if the display is in an unsupported mode or in a mode
      MDEBUG supports itself, e.g. a normal text mode with at least 80x25
      characters (i.e. 80x43 or 132x44 (v1.60+)). In this case MDEBUG will
      not call any of the other functions for this popup session.
    MDEBUG will not call the other functions if the returned version is
      less than the actual version of MDEBUG.
    if the driver is reentrant, DL and DH should be 00h
SeeAlso: AX=D001h,AX=D002h,AX=D003h,AX=D004h,AX=D005h
--------M-2FD000-----------------------------
INT 2F - ZWmous - INSTALLATION CHECK
    AX = D000h
Return: AX = 5A57h ("ZW") if installed
        BX = segment of resident code
Program: ZWmous is a shareware TSR by Zen Wu which permits the use of a mouse
      with many non-mouse applications by entering the letter under the
      mouse cursor on button presses
SeeAlso: INT 33/AX=0003h
--------N-2FD000-----------------------------
INT 2F - Lotus CD/Networker - INSTALLATION CHECK
    AX = D000h
Return: AL = FFh if CD/Networker TSR is loaded
    BX = 4D44h ("MD") signature
    CX = Windows mode word (from INT 2F/AX=1600h) at time of TSR load
    DX = bitmap identifying all loaded CD/Networker TSRs.
Notes:    INT 2F/AH=D0h is used by CD/Networker to communicate between a
      resident redirector TSR and a transient program that controls the
      TSR's CD-ROM drive emulation (volume attachments, caching, etc).
    At present there is only one CD/Networker TSR; the bitmap always = 4.
SeeAlso: AX=D002h"Lotus",INT 2F/AX=1500h"CD-ROM"
--------G-2FD001-----------------------------
INT 2F C - MDEBUG display driver - INITIALIZE DRIVER
    AX = D001h
Return: CF set on error
    AL = driver semaphor
    AH = buffer semaphor
Range:    AH=C0h to AH=FFh, selected by switch or programmatically
Notes:    MDEBUG calls this function after every successful call of the function
      00h. The function should reset all internal data and the status of
      the driver. If this function returns an error, MDEBUG will not call
      the other functions in this popup session.
    MDEBUG can use any two consecutive multiplex numbers between C0h and
      FFh; the default is D0h for the display driver and D1h for the
      command driver
SeeAlso: AX=D000h
--------G-2FD002-----------------------------
INT 2F C - MDEBUG display driver - SAVE GRAPHIC DATA
    AX = D002h
Return: CF set on error
    CF clear if successful
        display memory saved and display switched to one of the text modes
          02h, 03h or 07h.
Note:    MDEBUG calls this function only once every popup session before
      displaying its windows.
SeeAlso: AX=D000h,AX=D003h
--------N-2FD002BX4D44-----------------------
INT 2F - Multiplex - Lotus CD/Networker GET DATA AREA
    AX = D002h
    BX = 4D44h
    DX = bitmap identifying one loaded CD/Networker TSR
Return: ES:DI -> data area owned by TSR
Note:    the format of the data area changes with each minor revision, so it
      cannot be counted on
SeeAlso: AX=D000h"Lotus"
--------G-2FD003-----------------------------
INT 2F C - MDEBUG display driver - RESTORE GRAPHIC DATA
    AX = D003h
Return: CF set on error
    CF clear if successful
        display restored to the mode it was in before calling AX=D002h and
          the display memory is restored
Note:    MDEBUG calls this function only once every popup session just before
     it exits to normal DOS.
SeeAlso: AX=D000h,AX=D002h
--------G-2FD004-----------------------------
INT 2F - MDEBUG display driver - SHOW SAVED DATA
    AX = D004h
Return: CF set on error
    CF clear if successful
        display switched to mode it was in before calling AX=D002h and the
          display memory is restored
Note:    This function needn't save the display memory before changing it.
SeeAlso: AX=D000h,AX=D005h
--------G-2FD005-----------------------------
INT 2F - MDEBUG display driver - SWITCH BACK TO TEXT SCREEN
    AX = D005h
Return: CF set on error
    CF clear if successful
        display restored to mode it was in before calling AX=D004h
Note:    This function needn't save or change the display memory
SeeAlso: AX=D000h,AX=D004h
--------G-2FD0-------------------------------
INT 2F - MDEBUG display driver - RESERVED FUNCTION NUMBERS
    AH = D0h
    AL = 06h-7Fh
Note:    these functions are reserved for future use
--------G-2FD0-------------------------------
INT 2F - MDEBUG display driver - USER DEFINED FUNCTION NUMBERS
    AH = D0h
    AL = 80h-FFh
Note:    these functions numbers are reserved for user defined features (e.g.
      communication between the transient und resident parts of the driver)
--------G-2FD100-----------------------------
INT 2F C - MDEBUG command driver - GET STATUS
    AX = D100h
    BX = version of MDEBUG (BH = major, BL = minor)
    CX = command driver counter
---v1.60+---
    DS:SI -> MDEBUG identification table (see #2332)
    ES = segment of display memory used by MDEBUG
    DI = size of video mode used by MDEBUG
        (high byte = lines, low byte = columns)
Return: DL = FFh
    BX = version number of the driver if it is less than the version in BX,
          else unchanged
    CX incremented
Program: MDEBUG is a shareware memory-resident debugging tool by Bernd
      Schemmer, including a memory monitor, an interpreter, and a
      disassembler
Range:    AH=C0h to AH=FFh, selected by switch or programmatically
Notes:    called by MDEBUG at start of popup session; if the version number
      returned in BX is less than 1.52 (1.60 for MDEBUG v1.70), MDEBUG will
      not call any of the other functions during this popup session
    MDEBUG can use any two consecutive multiplex numbers between C0h and
      FFh; the default is D0h for the display driver and D1h for the
      command driver (call INT 60/AH=00h"MDEBUG" for the multiplex numbers
      actually used)
    this function must end with a far call to the old INT 2F handler after
      changing the registers
    this function MUST be reentrant
    command drivers must also declare the following data at the given
      offsets in the code segment
        100h  3 BYTEs    JMP-command in .COM-files
        103h    BYTE    NOP-command (90h)
        104h 26 BYTEs    signature "Kommandotreiber für MDEBUG"
        11Eh 12 BYTEs    name of driver, e.g. "MDHISDRV.COM"
                each driver must have a unique name
    MDEBUG will pass every key and command to the command driver(s) before
      checking for a valid internal command
SeeAlso: AX=D000h,AX=D101h

Format of MDEBUG identification table:
Offset    Size    Description    (Table 2332)
 -2    WORD    entry offset
 00h    WORD    CS of MDEBUG
 02h    DWORD    old INT 08h vector
 06h    DWORD    old INT 09h vector
 0Ah    DWORD    address INT 16h routine used by MDEBUG
 0Eh    BYTE    length of version string
 0Fh  N BYTEs    version string
--------G-2FD101-----------------------------
INT 2F - MDEBUG command driver - INITIALIZE DRIVER
    AX = D101h
    CX = command driver counter
Return: DL = status
        FFh if successful
        CX incremented
        else error: all registers unchanged
Note:    this function must end with a  far call to the old INT 2F handler after
      changing the registers
    this function must be reentrant
--------G-2FD102-----------------------------
INT 2F - MDEBUG command driver - EXECUTE INTERPRETER COMMAND
    AX = D102h
    BL = first character of the interpreter command
    BH = last character of the interpreter command (or blank)
    DS:SI -> parameter for the interpreter command as ASCIZ string
    DS:DI -> MDEBUG data structure (see #2334)
Return: AL = FFh
    CF set on error
        AH = error number (see #2333)
        DS:SI -> ASCIZ error message (max 30 characters) if AH=0Ch
    CF clear if successful
        AH = return code
        00h continue processing the command line
        01h leave MDEBUG popup session
        02h leave MDEBUG popup session and automatically popup again
              if the InDOS flag is zero
        03h not used (same as 00h)
        04h not used (same as 00h)
        05h put new command line into the input buffer,
            DS:SI -> new command line (ASCIZ string, max 66 chars)
        06h process new command line
            DS:SI -> new command line (ASCIZ string, max 66 chars)
           else unknown status, but continue processing commmand line
Note:    this function must end with a far call to the old INT 2F handler (with
      registers unchanged) if the driver does not support the interpreter
      command in BX.  Otherwise, the driver must not chain to the old
      INT 2F.

(Table 2333)
Values for MDEBUG error number:
 01h    syntax error
 02h    first shell of the command.com is activ
 03h    Esc pressed
 04h    break pressed
 05h    DOS is busy
 06h    command ended
 07h    division by zero
 08h    invalid display driver
 09h    invalid command driver
 0Ah    error 8 and 9
 0Bh    unknown error
 0Ch    new error
 else    unknown error

Format of MDEBUG data structure:
Offset    Size    Description    (Table 2334)
 00h    WORD    register SE
 02h    WORD    register OF
 04h    WORD    register FS
 06h    WORD    register FO
 08h    WORD    register AX
 0Ah    WORD    register BX
 0Ch    WORD    register CX
 0Eh    WORD    register DX
 10h    WORD    register SI
 12h    WORD    register DI
 14h    WORD    register DS
 16h    WORD    register ES
 18h    WORD    register BP
 1Ah    WORD    register SS
 1Ch    WORD    register SP
 1Eh    WORD    register FL (flags)
 20h    WORD    register R0
 22h    WORD    register R1
 24h    WORD    register R2
 26h    WORD    register R3
 28h    WORD    register R4
 2Ah    WORD    register R5
 2Ch    WORD    register R6
 2Eh    WORD    register R7
 30h    WORD    register R8
 32h    WORD    register CS, return-address
 34h    WORD    register IP, return-address
 36h    DWORD    saved pointer to data for key <F6> (v1.60)
        saved monitor address (v1.70)
 3Ah 12 WORDs    saved register values on last popup entry (for <F8> key)
        (original register values at popup entry of MDEBUG)
        AX, BX, CX, DX, SI, DI, DS, ES, BP, SS, SP, flags
 52h 12 WORDs    saved register values on last popup exit (for <SHIFT-F8> key)
        AX, BX, CX, DX, SI, DI, DS, ES, BP, SS, SP, flags
 6Ah    DWORD    address of the DOS-invars-table
 6Eh    DWORD    address of the InDOS flag
 72h    WORD    offset of the register which is used for the segment of the
          first monitor window
 74h    WORD    offset of the register which is used for the offset of the
          first monitor window
 76h    WORD    name of the register which is used for the segment of the
          first monitor segment
 78h    WORD    name of the register which is used for the offset of the first
          monitor window
 7Ah    WORD    pseudo register 1
 7Ch    WORD    pseudo register 2
--------G-2FD103-----------------------------
INT 2F - MDEBUG command driver - EXECUTE KEY IN THE MONITOR
    AX = D103h
    BX = key code (like result of an interrupt 16h call)
    CX = cursor position
        0000h in the ASCII column of the monitor
        0001h in one of the hex fields of the monitor
    DS:SI -> MDEBUG data structure (see #2334)
    ES:DI -> actual byte in the monitor
Return: AL = FFh
    AH = return code
        00h key processed, read next key
        01h leave MDEBUG popup session
        02h leave MDEBUG popup session and automatically popup again if DOS
          is not busy
        03h signal an error (beep)
        04h driver has redefined the key, proceed with the new key
        BX = new key code
        MDEBUG will not pass the new key to the command driver(s)
       else treat like code 00h
Note:    this function must end with a far call to the old INT 2F handler (with
      registers unchanged) if the driver does not support the key in BX.
      Otherwise, the driver must not chain to the old INT 2F.
SeeAlso: AX=D104h
--------G-2FD104-----------------------------
INT 2F - MDEBUG command driver - EXECUTE KEY IN THE INTERPRETER
    AX = D104h
    DS:SI -> MDEBUG data structure (see #2334)
Return: AL = FFh
    AH = return code
        00h key processed, read next key
        01h leave MDEBUG popup session
        02h leave MDEBUG popup session and automactically popup again if
          DOS is not busy
        03h signal an error (beep)
        04h driver has redefined the key, proceed with the new key
        BX = new key code
        MDEBUG won't pass the new key to the command driver(s)
        05h put new command line into the input buffer
        DS:SI -> new command line (ASCIZ string, max 66 chars)
        06h process new command line
        DS:SI -> new command line (ASCIZ string, max 66 chars)
       else treat like code 00h
Note:    this function must end with a far call to the old INT 2F handler if the
      driver does not support the key in BX.  Otherwise, the driver must
      not chain to the old INT 2F.
SeeAlso: AX=D103h
--------G-2FD1-------------------------------
INT 2F - MDEBUG command driver - RESERVED FUNCTIONS
    AH = D1h
    AL = 05h-0Ah
Note:    these functions are reserved for future use
--------G-2FD110-----------------------------
INT 2F - MDEBUG command driver - GET ADDRESS OF THE OLD INT 2F
    AX = D110h
Return: DL = FFh
    ES:BX -> next program in the chain for INT 2F
    CX = code segment of this driver
    DI = offset of driver identification table (see #2335) (v1.60+)
Notes:    only called by the transient part of the driver
    must be reentrant and the driver must not chain this function to the
      old INT 2F

Format of the MDEBUG driver identification table:
Offset    Size    Description    (Table 2335)
 00h  26 BYTEs     signature "Kommandotreiber für MDEBUG"
                         ^- Note: ASCII 129,German U-umlaut
 27h  12 BYTEs     name of driver, e.g. "MDHISDRV.COM"
         each driver must have a unique name
--------G-2FD111-----------------------------
INT 2F - MDEBUG command driver - START DRIVER
    AX = D111h
Return: DL = FFh
Notes:    only called by the transient part of the driver to inform the resident
      part that it is installed
    the function must be reentrant and the driver mustn't chain this
      function to the old INT 2F
SeeAlso: AX=D101h,AX=D112h
--------G-2FD112-----------------------------
INT 2F - MDEBUG command driver - END DRIVER
    AX = D112h
Return: DL = FFh
Notes:    only called by the transient part of the driver to inform the resident
      part that it will be released after this function
    the function must be reentrant and the driver mustn't chain this
      function to the old INT 2F
SeeAlso: AX=D101h,AX=D111h
--------G-2FD1-------------------------------
INT 2F - MDEBUG command driver - RESERVED FUNCTIONS
    AH = D1h
    AL = 13h-7Fh
Note:    these functions are reserved for future use
--------G-2FD1-------------------------------
INT 2F - MDEBUG command driver - USER DEFINED FUNCTIONS
    AH = D1h
    AL = 80h-FFh
Note:    these functions are reserved for user defined features (e.g.
      communication between the transient und resident parts of the driver)
--------U-2FD200-----------------------------
INT 2F - PCL-838.EXE - INSTALLATION CHECK
    AX = D200h
Return: AL = FFh if installed??? (documented as AX = return value)
Program: PCL-838 is a resident utility for controlling a stepmotor adapter
      board by Advantec
SeeAlso: AX=D201h"PCL-838",AX=D202h"PCL-838"
--------Q-2FD200BX5144-----------------------
INT 2F - Quarterdeck RPCI - INSTALLATION CHECK
    AX = D200h
    BX = 5144h ("QD")
    CX = 4D45h ("ME")
    DX = 4D30h ("M0")
Return: AL = FFh installed
    if BX,CX,DX registers were as specified on entry:
        BX = 4D45h ("ME")
        CX = 4D44h ("MD")
        DX = 5652h ("VR")
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
Notes:    the Quarterdeck RPCI (Resident Program Communication Interface) is
      supported by QEMM v5.0+, QRAM, MANIFEST, VIDRAM, etc.
    for AL <> 0, if the BX/CX/DX values don't match the identifier of a
      Quarterdeck product, it just chains to the previous INT 2F handler
SeeAlso: AX=D201h/BX=4849h,AX=D201h/BX=4D41h,AX=D201h/BX=4D45h
SeeAlso: AX=D201h/BX=5145h,AX=D201h/BX=5649h
--------U-2FD201-----------------------------
INT 2F - PCL-838.EXE - UNINSTALL
    AX = D201h
Return: AX = return value
SeeAlso: AX=D200h"PCL-838",AX=D202h"PCL-838"
--------m-2FD201BX4849-----------------------
INT 2F - Quarterdeck RPCI - GET QD HIMEM PRESENCE
    AX = D201h
    BX = 4849h ("HI")
    CX = 4D45h ("ME")
    DX = 4D51h ("MQ")
Return: BX = 4F4Bh ("OK")
    ES:DI -> HIMEM entry point
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
SeeAlso: AX=D200h,AX=D201h/BX=5145h
--------m-2FD201BX4849-----------------------
INT 2F - Quarterdeck RPCI - QEMM/QRAM v5.0+ - GET HIRAM MEMORY CHAIN
    AX = D201h
    BX = 4849h ("HI")
    CX = 5241h ("RA")
    DX = 4D30h ("M0")
Return: BX = 4F4Bh ("OK")
    CX = segment of start of HIRAM chain
    DX = reserved block owner (QEMM/QRAM code segment)
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
Note:    the HIRAM memory chain has the same format as the regular DOS 4.0
      memory chain (see #0969 at INT 21/AH=52h), except that XMS Upper
      Memory Blocks have the block header program name field set to
      "UMB"; blocks whose "owner" field is set to the reserved segment
      returned in DX are locked-out regions such as video memory and ROMs.
SeeAlso: AX=12FFh/BX=0006h,AX=D200h
--------G-2FD201BX4D41-----------------------
INT 2F U - Quarterdeck RPCI - MANIFEST v1.0+ - INSTALLATION CHECK
    AX = D201h
    BX = 4D41h ("MA")
    CX = 4E49h ("NI")
    DX = 4645h ("FE")
Return: BX = 5354h ("ST") if installed
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
SeeAlso: AX=D200h
--------E-2FD201BX4D45-----------------------
INT 2F U - Quarterdeck RPCI - DVDOS4GX.DVR - ???
    AX = D201h
    BX = 4D45h ("ME")
    CX = 5155h ("QU")
    DX = 5044h ("PD")
Return: AL = FFh
    BX = 4F4Bh ("OK")
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
Note:    this function is called by QEMM 6.03
    performs a variety of actions before setting return registers
SeeAlso: AX=D200h
--------m-2FD201BX5145-----------------------
INT 2F - Quarterdeck RPCI - QEMM v5.0+ - INSTALLATION CHECK
    AX = D201h
    BX = 5145h ("QE")
    CX = 4D4Dh ("MM")
    DX = 3432h ("42")
Return: BX = 4F4Bh ("OK")
    ES:DI -> QEMM API entry point (see INT 67/AH=3Fh)
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
Note:    this call is not available under QEMM v6.00 unless Windows3 support
      has been disabled with the NW3 switch to QEMM386.SYS
SeeAlso: AX=D200h,AX=D201h/BX=4849h,INT 67/AH=3Fh
--------V-2FD201BX5649-----------------------
INT 2F u - Quarterdeck RPCI - VIDRAM v5.0+ - INSTALLATION CHECK
    AX = D201h
    BX = 5649h ("VI")
    CX = 4452h ("DR")
    DX = 414Dh ("AM")
Return: BX = 4F4Bh ("OK")
    ES:DI -> VIDRAM entry point (see #2336)
Range:    AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
SeeAlso: AX=D200h

(Table 2336)
Call VIDRAM entry point with:
    AH = 00h get status
        Return: AL = VIDRAM state (see #2337)
            BL = extra RAM status (see #2338)
            BH = feature flags (see #2339)
            CL = current monitor (01h = mono, 80h = color)
            SI = current top of memory (paragraph)
            DI = segment of start of HiRAM chain
    AH = 01h setup
        AL = VIDRAM state (see #2337)
        BL = extra RAM status (see #2338)
        BH = feature flags (see #2339)
        CL = monitor (01h = monochrome, 80h = color)
        SI = new top of memory (paragraph)
        DI = segment of start of HiRAM chain
    AH = 02h get end address of VIDRAM code
        Return: ES:DI -> VIDRAM partial map context (see #2340,#2341)
Return: CF set on error
    CF clear if successful

(Table 2337)
Values for VIDRAM state:
 00h    off
 01h    no EGA graphics
 02h    no graphics at all

(Table 2338)
Values for VIDRAM extra RAM status:
 00h    VIDRAM does not use extra RAM
 01h    VIDRAM uses EMS as extra RAM
 02h    VIDRAM uses EGA as extra RAM

Bitfields for VIDRAM feature flags:
Bit(s)    Description    (Table 2339)
 0    override enabled
 1    mapped memory detected in A000h-B000h range
 2    top of memory not at 640K
 3    MDA detected
 4    high RAM exists in video area
 5    mapped memory detected in video area
 6-7    reserved???

Format of VIDRAM partial map context (EMS 3.2):
Offset    Size    Description    (Table 2340)
 00h    BYTE    EMS version ID (32h)
 01h    WORD    EMM handle for this entry
 03h    BYTE    number of frames
 04h    BYTE    first page frame
 05h    WORD    offset from ES to previously saved map

Format of VIDRAM partial map context (EMS 4.0):
Offset    Size    Description    (Table 2341)
 00h    BYTE    EMS version ID (40h)
 01h    WORD    mappable segment count
 03h  N WORD    mappable segments
    WORD    offset to previously saved map???
--------U-2FD202-----------------------------
INT 2F - PCL-838.EXE - EXECUTE PCL838 COMMANDS
    AX = D202h
    CX:BX -> parameter table
Return: AX = return value
SeeAlso: AX=D200h"PCL-838",AX=D201h"PCL-838"
--------R-2FD300BX4562-----------------------
INT 2F U - TeleReplica - INSTALLATION CHECK
    AX = D300h
    BX = 4562h
    CX = 2745h
    DX = serial port I/O base address??? (03F8h for v3.9)
Return: SI = segment of resident code
    AX = 251Dh
    BX = DF21h
    CX = F321h
    DX = ???
--------R-2FD3CB-----------------------------
INT 2F U - LapLink Quick Connect v6 - API
    AX = D3CBh
    CX = function
        0002h get ???
        Return: BX:AX -> ???
            CL = ???
            CH = ???
            DX = ???
            DI = COM1 I/O port???
            SI = COM2 I/O port???
        0003h initialization???
        0004h ???
        0005h initialization???
        0006h reset/clear ???
        Return: AX = 0000h
            ES:DI -> next byte after ??? cleared by this call
        0007h initialization???
        0008h uninstall
        Return: BX = status
                0000h successful
                FFFFh incomplete, stub remains in memory
Return: CX = 534Bh (except function 0002h)
Index:    uninstall;LapLink Quick Connect
--------K-2FD3D3BH00-------------------------
INT 2F - KDRIVE v2.x - INSTALLATION CHECK
    AX = D3D3h
    BH = 00h
Return: BX = 3D3Dh if installed
    CF clear if installed
        AX = driver ID??? (returns 0087h for KDRIVE.EXE and 0880h for
          KDRIVOS2.EXE in one examined version)
Program: KDRIVE is a shareware extended German keyboard driver by Martin
      Austermeier, originally based on K3 by Martin Gerdes as published
      in c't magazine 7/1988
--------l-2FD44D-----------------------------
INT 2F - 4DOS.COM v2.1+ - API
    AX = D44Dh
    BH = function
        00h installation check
        Return: AX = 44DDh
            BL = major version number
            BH = minor version number
            CX = PSP segment address for current invocation
            DL = 4DOS shell number (0 for the first (root) shell,
                  updated each time a new copy is loaded)
        01h (internal, v2.1-3.03) terminate current copy of 4DOS
        Return: nothing
        (internal, v4.0+) ???
        Return: AX = 44DDh
            ES:BX -> data area (see #2342)
        02h ???
        DX = ???
        Note:    v5.52 signals "unrecoverable error" and then terminates
              with INT 21/AH=4Ch or enters a deliberate infinite
              loop if ???
    ---v2.1-3.03 only---
        03h EXEC program
        CX:DX -> EXEC record (see #2343)
        FEh deallocate shell number (passed through to root shell)
        ???
        FFh allocate shell number (passed through to root shell)
    ---v5.52---
        03h get ???
        BL = ??? (00h/01h)
        Return: DX = current value of ???
        04h set ???
        BL = ??? (00h/01h)
        DX = new value for ???
Note:    a bug in v3.00 will crash the system if unrecognized value in BH
SeeAlso: AX=D44Eh,AX=D44Fh/BX=0000h,AX=E44Dh,INT 21/AX=4403h"DOS"
Index:    installation check;4DOS|installation check;NDOS

Format of 4DOS v4.0 data area:
Offset    Size    Description    (Table 2342)
 00h  2 BYTEs    ???
 06h    WORD    XMS handle for swapping
    ???
SeeAlso: #2343

Format of 4DOS EXEC v2.1-v3.03 record:
Offset    Size    Description    (Table 2343)
 00h    WORD    offset of ASCIZ program name in same segment as EXEC record
 02h    WORD    offset of DOS commandline in same segment as EXEC record
 04h    WORD    segment of environment for child process (see INT 21/AH=26h)
SeeAlso: #2342
--------l-2FD44E-----------------------------
INT 2F C - 4DOS v3.0+ - AWAITING USER INPUT
    AX = D44Eh
---4DOS v3.01+---
    BX = condition
        0000h 4DOS is ready to display prompt
        0001h 4DOS has displayed the prompt, about to accept user input
Return: the handler must preserve SI, DI, BP, SP, DS, ES, and SS
Note:    v3.00 only makes the call corresponding to BX=0001h, does not set BX
SeeAlso: AX=D44Dh
--------K-2FD44FBX0000-----------------------
INT 2F - 4DOS v4.0+ - KSTACK.COM - INSTALLATION CHECK
    AX = D44Fh
    BX = 0000h
Return: AX = 44DDh if installed
Note:    this function is also supported by ANSIPLUS v3.01+ and K3PLUS v6.20+,
      which emulate the 4DOS and NDOS keystack
SeeAlso: AX=D44Dh,AX=D44Fh/BX=0001h,AX=E44Fh/BX=0000h
--------K-2FD44FBX0001-----------------------
INT 2F - 4DOS v4.0+ - KSTACK.COM - PLACE KEYSTROKES INTO KEYSTACK
    AX = D44Fh
    BX = 0001h
    CX = number of keystrokes (01h-FFh)
    DS:DX -> keystroke list (one word per keystroke)
Return: AX = status
        0000h successful
        nonzero failed
    BX,CX,DX destroyed
Notes:    the keystrokes are the exact values to return from subsequent calls to
      INT 16 with AH=00h,01h,10h, or 11h, with the following exceptions:
        0000h causes subfunctions 01h and 11h to indicate an empty
              keyboard buffer
        FFFFh is followed by a word indicating the number of clock
              ticks to delay before the next faked keystroke
    v4.00 KSTACK overwrites any unread keystrokes from the previous
      invocation, and does not range-check CX; it will overwrite memory
      following the resident portion if CX is greater than 100h.
    this function is also supported by ANSIPLUS v3.01+ and K3PLUS v6.20+,
      which emulate the 4DOS and NDOS keystack
SeeAlso: AX=D44Dh,AX=D44Fh/BX=0000h,INT 16/AH=00h,INT 21/AX=4403h"DOS"
--------G-2FD600-----------------------------
INT 2F - HEART.COM - INSTALLATION CHECK
    AX = D600h
Return: AX = 0303h (two hearts) if installed
        ES:DI -> buffer (see #2344)
Program: HEART.COM is a CPU lock-up/critical indicator utility by Mitch Davis.
Notes:    Once the host program has identified the address of the data area, it
      can change this to indicate safe/critical, alternate colours, etc.
    The entries for the color table are in char/attrib form.  Every two
      entries form a pair which is alternated between 68 times a minute.
      The first half of the table is for color videos, the second mono.
      Within each half, the first half is for the safe chars, and the
      second for the critical chars.

Format of HEART.COM buffer:
Offset    Size    Description    (Table 2344)
 00h  8 WORDs    table of colors/attributes (refer to notes above)
 10h    BYTE    flags
        bit 0: program is in critical section, so flash double
              exclamation mark
        bit 1: program is in safe code, so flash the heart character
 11h    WORD    position of heartbeat on screen, normally 009Eh (last column
        of second line)
--------T-2FD600-----------------------------
INT 2F U - VEDIT VSWAP - INSTALLATION CHECK
    AX = D600h
Return: AL = D6h if installed
Program: VSWAP is the resident portion of VEDIT's "swapper" capability; VEDIT
      is a programmer's text editor by Greenview Data.
SeeAlso: AX=D601h,AX=D602h
--------T-2FD601-----------------------------
INT 2F U - VEDIT VSWAP - ???
    AX = D601h
    BL = subfunction number???
Return: BL = return code ???
    ES = resident portion's data??? segment
    DX = resident portion's code segment
SeeAlso: AX=D600h"VSWAP"
--------T-2FD602-----------------------------
INT 2F U - VEDIT VSWAP - EXEC PROGRAM WITH SWAP
    AX = D602h
    other registers set as for INT 21/AX=4B00h
Return: CF set on error
        AL = error code
        82h = failure due to ???
    CF clear on success
SeeAlso: AX=D600h"VSWAP",INT 21/AH=4Bh"EXEC"
--------N-2FD701BX0000-----------------------
INT 2F - Banyan VINES v4+ - GET BANV INTERRUPT NUMBER
    AX = D701h
    BX = 0000h
Return: AX = 0000h if installed
        BX = interrupt number (60h to 66h)
       nonzero not present
Note:    if AX is nonzero, VINES 3.x or earlier may be installed, thus it is
      necessary to examine the four bytes preceding the handlers for
      INT 60 through INT 66 for the string "BANV"
SeeAlso: AX=D702h,AX=D703h,AX=D704h
--------N-2FD702-----------------------------
INT 2F U - Banyan VINES v4+ - PCPRINT interface
    AX = D702h
    BX = function
    ???
Return: ???
SeeAlso: AX=D701h,AX=D703h,INT 61/AX=0005h"Banyan"
--------N-2FD703-----------------------------
INT 2F U - Banyan VINES v4+ - MAIL interface
    AX = D703h
    BX = function
    ???
Return: ???
SeeAlso: AX=D702h,AX=D704h
--------N-2FD704-----------------------------
INT 2F U - Banyan VINES v4+ - Streettalk Directory Assistance interface
    AX = D704h
    BX = function
    ???
Return: ???
SeeAlso: AX=D703h,INT 61/AX=0007h/BX=0002h"Banyan",INT 61/AX=0007h/BX=0008h
--------N-2FD800-----------------------------
INT 2F U - Novell NetWare Lite - CLIENT.EXE - INSTALLATION CHECK
    AX = D800h
Return: AL = FFh if installed
        DX = version number (0100h for v1.0, 0101h for v1.1)
        BX = data segment of resident copy
        ES:DI -> private API entry point (see #2345)
        SI = segment of resident code
SeeAlso: AX=7A00h,AX=D880h

(Table 2345)
Call CLIENT API entry point with:
    BX = function
        0000h get ???
        Return: DX = CLIENT version??? (0101h for v1.1)
            ES:BX -> ??? data
        0001h ???
        0002h ???
        0003h ???
        0004h ???
        0005h ???
        DL = ???
        ???
        Return: ???
        0006h get module name???
        ES:DI -> 16-byte buffer
        Return: CX = ???
            ES:DI filled with "NWLITE_CLIENT" 00h 00h 00h
        0007h ???
        DX:CX = ???
        ???
        Return: ???
        0008h ???
        0009h ???
        DL = ???
        ES:DI -> 16-byte buffer for ???
        Return: CF clear if successful
                AX = 0000h
                CX = 0000h
                SI,DI destroyed
            CF set on error
                AX = error code 4903h
        000Ah ???
        AH = subfunction
            00h get ???
            01h clear/set ??? flag
            AL = new state (00h cleared, 01h set)
            02h set ???
            DX = new value of ???
        Return: DX = old value of ???
        000Bh ???
        AX = ???
        ???
        Return: ???
        000Ch ???
        AX = ???
        ???
        Return: ???
        000Dh ???
        AX = ???
        ???
        Return: ???
        000Eh get original INT 17
        Return: CF clear
            ES:BX -> original INT 17
        000Fh ???
        0010h ???
        AX = ???
        ???
        Return: ???
        0011h get ???
        Return: CF clear
            DL = ???
        0012h get ???
        AL = index of ???
        ES:DI -> 10-byte buffer for ???
        Return: CF clear if successful
                ES:DI buffer filled
                AX,CX destroyed
            CF set on error
                AX = error code (4907h if AL out of range)
        0013h get ???
        Return: CF clear
            DH = ???
            DL = ???
        0014h ???
        DL = ???
        ???
        Return: CF clear if successful
                ???
            CF set on error
                AX = error code 8056h
        0015h ???
        DX = ???
        Return: ES:DI -> ???
        other
        Return: CF set
            AX = 0001h (invalid function)
--------N-2FD856-----------------------------
INT 2F U - Novell NetWare Lite v1.1 - SERVER - GET ???
    AX = D856h
Return: AX = 0001h if supported???
    BX = ??? (0004h for v1.1)
    CX = ??? (0F20h for v1.1)
    DS = segment of resident code
    ES = data segment of resident copy
Note:    this function is also supported by Personal NetWare SERVER, bundled
      with Novell DOS 7
--------N-2FD880-----------------------------
INT 2F U - Novell NetWare Lite v1.0+ - SERVER - INSTALLATION CHECK
    AX = D880h
Return: AL = FFh if installed
        DX = version number (0100h for v1.0, 0101h for v1.1)
        BX = data segment of resident copy
        CL = current state (00h SERVER is disabled, 01h SERVER is active)
        ES:DI -> private API entry point (see #2346)
        SI = ??? (offset of configuration info?)
Note:    this function is also supported by Personal NetWare SERVER, but DI is
      not set; instead, ES:SI points at the API entry point
SeeAlso: AX=7A00h,AX=D800h,INT 2A/AX=D852h

(Table 2346)
Call SERVER API entry point with:
    BX = function
        0000h ???
        ???
        Return: ???
        Note: closes open files by calling INT 21/AH=3Eh
        0001h get connection information
        DX = connection number (0001h-max connections)
        ES:DI -> 28-byte buffer for connection information
        Return: CF clear if successful
                ES:DI buffer filled
            CF set on error
                AX = FFFFh
    ---Personal NetWare only---
        0002h ???
        0003h ???
        0004h ???
        0005h ???
        0006h ???
        0007h ???
        other
        Return: CF set
            AX = 0001h (invalid function)
--------d-2FD8C0-----------------------------
INT 2F U - Novell NLCACHE,NWCACHE - INSTALLATION CHECK
    AX = D8C0h
Return: AL = FFh if installed
        CL = cache variant (01h NLCACHEC, 02h NLCACHEX, 03h NLCACHEM)
        DH = major version??? (01h for v1.1)
        DL = minor version??? (01h for v1.1)
        ES:DI -> private API entry point (see #2347)
Program: NLCACHE is a disk cache included with NetWare Lite
SeeAlso: AX=D800h,AX=D880h

(Table 2347)
Call NLCACHE/NWCACHE API entry point with:
    BX = function
        0000h ???
        ???
        Return: CF clear if successful
                AX = 0000h
                ???
            CF set on error
                AX = error code
        0001h (NWCACHE only) ???
        ES:DI -> buffer for ???
        Return: ???
        other
        Return: CF set
            AX = 0001h (invalid function)
--------F-2FDA00-----------------------------
INT 2F - ZyXEL ZFAX v1.x - INSTALLATION CHECK
    AX = DA00h
Return: AH = enabled state (00h = enabled, 01h = disabled)
    AL = 5Ah installed
Program: ZFAX is the bundled FAX software which comes with the ZyXEL model
      fax modems.
Note:    This function, and the other DAxxh functions, may apply only to version
      1 of the software; see AX=DB00h for the version 2 installation check
SeeAlso: AX=CBDCh,AX=DA01h,AX=DA02h,AX=DA03h,AX=DB00h
--------F-2FDA01-----------------------------
INT 2F - ZyXEL ZFAX v1.x - UNINSTALL
    AX = DA01h
Return: AL = 00h Success
         01h Failure
SeeAlso: AX=DA00h,AX=DB01h
--------F-2FDA02-----------------------------
INT 2F - ZyXEL ZFAX v.1x - DISABLE
    AX = DA02h
Return: AL = 00h
SeeAlso: AX=DA03h,AX=DB02h
--------F-2FDA03-----------------------------
INT 2F - ZyXEL ZFAX v1.x - ENABLE
    AX = DA03h
Return: AL = 00h
SeeAlso: AX=DA02h,AX=DB03h
--------G-2FDA55-----------------------------
INT 2F U - TRAP.COM - INSTALLATION CHECK
    AX = DA55h
    DL = interrupt number
    DH = ???
Return: if installed
        AH = interrupt number
        AL = ???
        ES:BX -> ???
Program: TRAP is an interrupt call tracer by Patrick Phillipot/Udo Chrosziel
Note:    a separate copy of TRAP is loaded for each interrupt to be traced; thus
      the interrupt number is part of the installation check
--------N-2FDAB2-----------------------------
INT 2F U - Beame&Whiteside BWSNMP - INSTALLATION CHECK
    AX = DAB2h
Return: AX = 00FFh if installed
        BX:CX -> MIB table
Program: BWSNMP is part of the BW-NFS package
SeeAlso: INT 62/AH=00h"ETHDEV"
--------F-2FDB00-----------------------------
INT 2F - ZyXEL ZFAX v2+ - INSTALLATION CHECK
    AX = DB00h
Return: AL = 5Bh if installed (v2.x)
        ES:BX -> configuration table???
    AX = 00DBh if installed (v3)
        ES:BX -> ZFAX configuration table (see #2348)
Program: ZFAX is the bundled FAX software which comes with the ZyXEL model
      Fax modems.
SeeAlso: AX=CBDCh,AX=DA00h,AX=DB01h,AX=DB02h,AX=DB03h

Format of ZFAX Configuration Table:
Offset    Size    Description    (Table 2348)
 00h    WORD    table version number (0300h for v3.0-v4.01)
 02h    BYTE    reserved
 03h 70 BYTEs    ZFAX working path
 49h 128 BYTEs    path to external editor
 C9h 128 BYTEs    path to external terminal emulator
149h 128 BYTEs    path to Ring Shell
1C9h 128 BYTEs    path to DOS Shell
249h 128 BYTEs    path to Data Shell
2C9h 70 BYTEs    path to Chinese font
30Fh    BYTE    printer type (see #2349)
310h    BYTE    printer port (00h = LPT1, etc.)
311h    BYTE    type of graphics adapter
        (00h auto-detect, 01h VGA, 02h EGA, 03h CGA, 04h Hercules)
312h    BYTE    display type
        (00h auto-detect, 01h LCD, 02h color, 03h mono)
313h    BYTE    scan code for ZFAX hotkey (see #0005)
314h    BYTE    shift mask for ZFAX hotkey
315h    BYTE    tone/pulse dialing (00h tone, 01h pulse)
316h    BYTE    Caller ID (00h disabled, 01h enabled)
317h    BYTE    Distinctive Ring (00h disabled, 01h enabled)
318h    BYTE    normal ring answer type (see #2350)
319h    BYTE    Ring 1 answer type (see #2350)
31Ah    BYTE    Ring 2 answer type (see #2350)
31Bh    BYTE    Ring 3 answer type (see #2350)
31Ch    BYTE    COM port for modem
31Dh    BYTE    speaker volume (00h-07h)
31Eh    BYTE    modem dial timer, seconds
31Fh    WORD    user-defined COM port I/O address
321h    BYTE    user-defined COM port IRQ number
322h 81 BYTEs    dial prefix string
373h 79 BYTEs    dial postfix string
3C2h    BYTE    ring count until automatic answer
3C3h    BYTE    retry count on busy signal
3C4h    BYTE    redial delay in seconds
3C5h    WORD    system password
3C7h    BYTE    reserved
3C8h    BYTE    voice file compression format
        00h CELP at 9600bps
        01h two-bit ADPCM at 19200bps
        02h three-bit ADPCM at 28800bps
3C9h    BYTE    voice system: DTMF 0 action (see #2351)
3CAh    BYTE    voice system: DTMF 1 action
3CBh    BYTE    voice system: DTMF 2 action
3CCh    BYTE    voice system: DTMF 3 action
3CDh    BYTE    voice system: DTMF 4 action
3CEh    BYTE    voice system: DTMF 5 action
3CFh    BYTE    voice system: DTMF 6 action
3D0h    BYTE    voice system: DTMF 7 action
3D1h    BYTE    voice system: DTMF 8 action
3D2h    BYTE    voice system: DTMF 9 action (see #2351)
3D3h    WORD    reserved
3D5h 25 BYTEs    local FAX ID to display on page header
3EEh 20 BYTEs    local FAX ID sent to remote FAX
402h    BYTE    FAX page size
        00h A4 (210x297mm)
        01h B4 (250x353mm)
        02h A3 (297x420mm)
403h    BYTE    FAX resolution
        00h normal (3.85 pixels/mm)
        01h high (7.7 pixels/mm)
404h    BYTE    FAX coding scheme
        00h 1-D, modified Huffman coding
        01h 2-D, modified READ coding
405h    BYTE    left margin for text in millimeters
406h    BYTE    vertical insertion for text in mm (0-20)
407h    BYTE    horizontal insertion in mm (0-20)
408h    BYTE    maximum text lines per page
409h    BYTE    text type (00h ASCII, 01h WordStar-formatted)
40Ah    BYTE    PCX image resize (00h disabled, 01h enabled)
40Bh    BYTE    AutoPrint (00h disabled, 01h enabled)
40Ch    BYTE    cover page (00h disabled, 01h enabled)
40Dh 81 BYTEs    cover page logo filename
45Eh 65 BYTEs    cover page sender name
49Fh    BYTE    print capture (00h disabled, 01h enabled)
4A0h    BYTE    send immediately (00h disabled, 01h enabled)
4A1h    BYTE    print capture printer port
4A2h    BYTE    print capture timer in seconds
4A3h    BYTE    scan code for print capture hotkey (see #0005)
4A4h    BYTE    shift mask for print capture hotkey
4A5h    BYTE    DataShell type
        00h internal Zmodem, 01h Data Shell, 02h disable
4A6h    BYTE    video I/O type
        00h auto-detect, 01h use BIOS, 02h direct writes
4A7h    BYTE    call transfer digits (0-9)
4A8h    WORD    voice recorder maximum time in seconds (0-999)

(Table 2349)
Values for ZFAX printer type:
 00h    EPSON FX (9 pins)
 01h    EPSON LQ (24 pins)
 02h    HP Laser Jet II, letter size
 03h    HP Laser Jet II, legal size
 04h    HP Laser Jet II, A4 size
 05h    HP Laser Jet III, letter size
 06h    HP Laser Jet III, legal size
 07h    HP Laser Jet III, A4 size
SeeAlso: #2348

(Table 2350)
Values for Ring Answer Type:
 00h    voice system
 01h    FAX only
 02h    Data Shell
 03h    Ring Shell
 04h    DOS Shell
 05h    ignore
SeeAlso: #2348

(Table 2351)
Values for DTMF action:
 00h    none
 01h    page operator
 02h    FaxBack
 03h    announcement
 04h    call transfer
 05h    receive FAX
 06h    receive data
 07h    voice mailbox
 08h    DOS Shell Out
 09h    Data Shell Out
SeeAlso: #2348
--------U-2FDB00-----------------------------
INT 2F U - WINGO.COM - INSTALLATION CHECK
    AX = DB00h
Return: AX = FFFFh if installed
    CX = 5749h ('WI') if installed
    DX = 4E47h ('NG') if installed
        ES = segment of resident code
Program: WINGO.COM is TSR for starting Windows programs from DOS
      prompt (together with companion Windows program
      WINSTART.EXE) written by Douglas Boling, contributing editor of
      PC Magazine
Range:    AH=DBh to AH=FFh, selected by scanning for a free multiplex number
SeeAlso: AX=DB01h"WINGO",AX=DB02h"WINGO",AX=DB03h"WINGO",AX=DB04h"WINGO"
SeeAlso: AX=DB05h"WINGO",AX=DB06h"WINGO"
--------F-2FDB01-----------------------------
INT 2F - ZyXEL ZFAX v2+ - UNINSTALL
    AX = DB01h
Return: AX = status
        0000h successful
        0001h ZFAX is busy
        0002h another program resident above ZFAX
Note:    this function unhooks the vectors taken by the ZFAX TSR if they have
      not been hooked by other TSRs and releases the TSR's memory
    ZFAX v2.x crashes the contributor's machine when this function is
      called
SeeAlso: AX=DA01h,AX=DB00h"ZFAX",AX=DB02h"ZFAX"
--------U-2FDB01-----------------------------
INT 2F U - WINGO.COM - SET CALLBACK FUNCTION POINTER
    AX = DB01h
    CX:DX -> new callback function
Return: AX = 0000h
    CX:DX -> end of resident code (stack ???)
Desc:    the callback function is used for WINGO <-> WINSTART communication
SeeAlso: AX=DB00h"WINGO",AX=DB02h"WINGO",AX=DB03h"WINGO",AX=DB04h"WINGO"
SeeAlso: AX=DB05h"WINGO",AX=DB06h"WINGO"
--------F-2FDB02-----------------------------
INT 2F - ZyXEL ZFAX v2.x - DISABLE
    AX = DB02h
Return: AL = 00h
SeeAlso: AX=DA02h,AX=DB00h"ZFAX",AX=DB01h"ZFAX",AX=DB03h"ZFAX"
--------U-2FDB02-----------------------------
INT 2F U - WINGO.COM - RESET CALLBACK FUNCTION POINTER
    AX = DB02h
Return: AX = 0000h
Desc:    the callback function is used for WINGO <-> WINSTART communication
SeeAlso: AX=DB00h"WINGO",AX=DB01h"WINGO",AX=DB03h"WINGO",AX=DB04h"WINGO"
SeeAlso: AX=DB05h"WINGO",AX=DB06h"WINGO"
--------F-2FDB03-----------------------------
INT 2F - ZyXEL ZFAX v2.x - ENABLE
    AX = DB03h
Return: AL = 00h
SeeAlso: AX=DA03h,AX=DB00h"ZFAX",AX=DB02h"ZFAX"
--------U-2FDB03-----------------------------
INT 2F U - WINGO.COM - SET ??? FLAG
    AX = DB03h
Return: AX = 0000h
SeeAlso: AX=DB00h"WINGO",AX=DB04h"WINGO",AX=DB05h"WINGO",AX=DB06h"WINGO"
--------U-2FDB04-----------------------------
INT 2F U - WINGO.COM - RESET ??? FLAG
    AX = DB04h
Return: AX = 0000h
SeeAlso: AX=DB00h"WINGO",AX=DB03h"WINGO",AX=DB05h"WINGO",AX=DB06h"WINGO"
--------U-2FDB05-----------------------------
INT 2F U - WINGO.COM - GET ??? FLAG
    AX = DB05h
Return: AX = 0000h
    DX = unknown flag - 0 or 1
Program: WINGO.COM is TSR for starting Windows programs from DOS
      prompt (together with companion Windows program
      WINSTART.EXE) written by Douglas Boling, contributing editor of
      PC Magazine
SeeAlso: AX=DB00h"WINGO",AX=DB03h"WINGO",AX=DB04h"WINGO"
--------U-2FDB06-----------------------------
INT 2F U - WINGO.COM - CALL CALLBACK FUNCTION
    AX = DB06h
Return: AX = return value of INT 2F/AX=1685h
Note:    uses Windows service INT 2F/AX=1685h (SWITCH VMs AND CALLBACK) to
      call the callback function previously set by AX=DB01h
    used for WINGO <-> WINSTART communication
SeeAlso: AX=1685h, AX=DB00h"WINGO",AX=DB01h"WINGO",AX=DB02h"WINGO",
SeeAlso: AX=DB03h"WINGO",AX=DB04h"WINGO",AX=DB05h"WINGO"
--------F-2FDB10-----------------------------
INT 2F - ZyXEL ZFAX v3+ - EXECUTE ZFAX MAIN MENU
    AX = DB10h
SeeAlso: AX=DB00h"ZFAX",AX=DB11h"ZFAX"
--------F-2FDB11-----------------------------
INT 2F - ZyXEL ZFAX v3+ - SEND FAX
    AX = DB11h
    DS:SI -> filename including path (max 128 characters)
    DS:BX -> remote FAX number
Return: AX = status (see #2352)
SeeAlso: AX=DB00h"ZFAX",AX=DB12h,AX=DB13h,AX=DB14h,AX=DB15h,AX=DB20h,AX=DB21h

(Table 2352)
Values for ZFAX status:
 00h    OK
 01h    invalid DOS function
 02h    file not found
 03h    path not found
 04h    no file handle available
 05h    access denied by DOS
 06h    invalid handle
 07h    disk full
 10h    printer error
 11h    no graphics font
 12h    no ZFAX font
 20h    DCD dropped while sending
 21h    not ZyXEL modem
 22h    busy
 23h    no response from COM port
 24h    no carrier
 25h    no dial tone
 26h    no answer
 27h    no response
 28h    failed to send FAX
 30h    user aborted
 40h    critical error on disk
 50h    parameter error
--------F-2FDB12-----------------------------
INT 2F - ZyXEL ZFAX v3+ - PRINT FAX
    AX = DB12h
    DS:SI -> filename, including path (max 128 characters)
Return: AX = status (see #2352)
SeeAlso: AX=DB11h,AX=DB13h,AX=DB14h
--------F-2FDB13-----------------------------
INT 2F - ZyXEL ZFAX v3+ - CONVERT FAX
    AX = DB13h
    DS:SI -> source filename, including path (max 128 characters)
    DS:BX -> destination filename, including path (max 80 characters)
    CX = destination file format
        00h FAX, 01h PCX, 02h TIFF, 03h PRN
Return: AX = status (see #2352)
SeeAlso: AX=DB11h,AX=DB12h,AX=DB14h,AX=DB22h
--------F-2FDB14-----------------------------
INT 2F - ZyXEL ZFAX v3+ - VIEW FAX
    AX = DB14h
    DS:SI -> source filename, including path (max 128 characters)
Return: AX = status (see #2352)
SeeAlso: AX=DB11h,AX=DB12h,AX=DB14h
--------F-2FDB15-----------------------------
INT 2F - ZyXEL ZFAX v4.01 - SEND FAX WITH LOGO AND SIGNATURE
    AX = DB15h
    DS:SI -> source filename, including path (max 128 characters)
    DS:BX -> remote FAX number
    DS:CX -> Logo filename
    DS:DX -> Signature filename
Return: AX = status (see #2352)
SeeAlso: AX=DB00h"ZFAX",AX=DB11h
--------F-2FDB16-----------------------------
INT 2F - ZyXEL ZFAX v4.01 - QUOTE PREVIOUS STATUS
    AX = DB16h
Return: DX:AX -> previous receive state transaction log (see #2353)
    BX = type (00h incoming FAX, 01h incoming data, 02h incoming voice)
SeeAlso: AX=DB00h"ZFAX",AX=DB11h,AX=DB17h

Format of ZFAX transaction log receive state:
Offset    Size    Description    (Table 2353)
 00h    WORD    year
 02h    WORD    date
 04h    WORD    time
 06h    WORD    extension number
 08h    WORD    type: 00h incoming FAX, 01h outgoing FAX, 02h voice message
 0Ah    WORD    status: 00h normal, 01h remote delete
 0Ch 125 BYTEs    filename
 89h 24 BYTEs    caller ID
 A1h 20 BYTEs    FAX number
 B5h 20 BYTEs    remote FAX ID
 C9h    WORD    error code
 CBh    WORD    connection direction (00h transmit, 01h receive)
 CDh    BYTE    connection time minutes
 CEh    BYTE    connection time seconds
 CFh    BYTE    ???
 D0h    WORD    connection speed (24, 48, 72, 96, 12, 144)
 D2h    WORD    connection page size (A4, B4, A3)
 D4h    WORD    connection coding scheme (1-DN, 1-DH, 2-DN, 2-DH)
 D6h    WORD    page count
--------F-2FDB17-----------------------------
INT 2F - ZyXEL ZFAX v4.01 - BEGIN RECEIVING INCOMING CALL
    AX = DB17h
Return: AX = status (0000h successful, 0001h unable to start at this time)
SeeAlso: AX=DB00h"ZFAX"
--------F-2FDB18-----------------------------
INT 2F - ZyXEL ZFAX v4.01 - SCHEDULE CALL
    AX = DB18h
    DS:SI -> schedule data (see #2353)
Return: AX = status (see #2352)
SeeAlso: AX=DB00h"ZFAX"
--------F-2FDB20-----------------------------
INT 2F - ZyXEL ZFAX v3+ - POLL FAX
    AX = DB20h
    DS:SI -> remote FAX number
Return: AX = status (see #2352)
SeeAlso: AX=DB11h,AX=DB21h
--------F-2FDB21-----------------------------
INT 2F - ZyXEL ZFAX v3+ - SEND VOICE
    AX = DB21h
    DS:SI -> filename including path (max 128 characters)
    DS:BX -> remote phone number
Return: AX = status (see #2352)
SeeAlso: AX=DB11h,AX=DB20h,AX=DB22h,AX=DB23h,AX=DB24h
--------F-2FDB22-----------------------------
INT 2F - ZyXEL ZFAX v3+ - CONVERT VOICE FILE
    AX = DB22h
    DS:SI -> source filename, including path (max 128 characters)
    DS:BX -> destination filename, including path (max 80 characters)
    CX = destination format
        00h two-bit ADPCM, 01h three-bit ADPCM, 02h VOC
Return: AX = status (see #2352)
SeeAlso: AX=DB13h,AX=DB20h,AX=DB21h,AX=DB23h
--------F-2FDB23-----------------------------
INT 2F - ZyXEL ZFAX v3+ - RECORD VOICE FILE
    AX = DB23h
    DS:SI -> destination filename, including path (max 128 characters)
    CX = recording channel (0 = telephone line, 1 = microphone/speaker)
    DX = voice file format
        00h CELP, 01h two-bit ADPCM, 02h three-bit ADPCM
Return: AX = status (see #2352)
SeeAlso: AX=DB21h,AX=DB22h,AX=DB24h
--------F-2FDB24-----------------------------
INT 2F - ZyXEL ZFAX v3+ - PLAY VOICE FILE
    AX = DB24h
    DS:SI -> name of voice file, including path (max 128 characters)
    CX = playback channel (0 = telephone line, 1 = microphone/speaker)
Return: AX = status (see #2352)
SeeAlso: AX=DB21h,AX=DB22h,AX=DB24h
--------F-2FDB25-----------------------------
INT 2F - ZyXEL ZFAX v3+ - ANSWER MODEM WITH VOICE SYSTEM
    AX = DB25h
Return: AX = status (see #2352)
SeeAlso: AX=DB21h,AX=DB22h,AX=DB26h,AX=DB27h,AX=DB28h
--------F-2FDB26-----------------------------
INT 2F - ZyXEL ZFAX v3+ - DIAL PHONE
    AX = DB26h
    DS:SI -> remote phone number
Return: AX = status (see #2352)
SeeAlso: AX=DB25h
--------F-2FDB27-----------------------------
INT 2F - ZyXEL ZFAX v3+ - RECEIVE FAX - ANSWER MODEM AND SET TO FAX MODE
    AX = DB27h
Return: AX = status (see #2352)
SeeAlso: AX=DB25h,AX=DB28h
--------F-2FDB28-----------------------------
INT 2F - ZyXEL ZFAX v3+ - RECEIVE FAX DATA - ANSWER MODEM IN MULTI-AUDIO MODE
    AX = DB28h
Return: AX = status (see #2352)
SeeAlso: AX=DB25h,AX=DB27h,AX=DB41h
--------F-2FDB40-----------------------------
INT 2F - ZyXEL ZFAX v3+ - INTERNAL TERMINAL
    AX = DB40h
Return: AX = status (see #2352)
SeeAlso: AX=DB00h
--------F-2FDB41-----------------------------
INT 2F - ZyXEL ZFAX v3+ - SEND DATA - DIAL NUMBER AND UPLOAD FILE WITH ZMODEM
    AX = DB41h
    DS:SI -> source file name, including path (max 128 characters)
    DS:BX -> remote data number
Return: AX = status (see #2352)
SeeAlso: AX=DB00h,AX=DB28h
--------K-2FDC00-----------------------------
INT 2F - GOLD.COM - INSTALLATION CHECK
    AX = DC00h
Return: AL = state
        00h not installed
        FFh installed
Program: GOLD is a TSR by Bob Eager which makes the NumLock key return the
      code for F1; the purpose is to improve Kermit's VTxxx emulation
--------K-2FDC01-----------------------------
INT 2F - GOLD.COM - GET STATE
    AX = DC01h
Return: AL = status
        00h off
        01h on
SeeAlso: AX=DC00h,AX=DC02h
--------K-2FDC02-----------------------------
INT 2F - GOLD.COM - SET STATE
    AX = DC02h
    DL = new state
        00h off
        01h on
Return: AL = 00h (OK)
SeeAlso: AX=DC01h
--------t-2FDD-------------------------------
INT 2F - CappaCom programs - API
    AH = DDh
    AL = 00h general installation check
        Return: AL = FFh if any CappaCom programs are resident
    AL = FEh get info
        Return: ES:BX -> TSR info list (see #2354)
    AL = program identifier
        BH = function
        FDh get version
            Return: BX = version
        FFh installation check
            Return: AL = FFh if installed
                BX = version
                ES = segment of resident code
        others vary by program
Return: AL = status
        bit 7 set on error
        AL = 81h unknown function
Note:    CappaCom was originally SoftCom but changed its name due to a trademark
      conflict
Index:    installation check;SoftCom programs
Index:    installation check;CappaCom programs

Format of CappaCom TSR info list:
Offset    Size    Description    (Table 2354)
 00h  9 BYTEs    blank-padded ASCIZ program name
 09h    BYTE    program ID
 0Ah    WORD    program's PSP segment
 0Ch    WORD    program version (major in high byte)
 0Eh    DWORD    pointer to next item in info list or 0000h:0000h
 12h    BYTE    number of interrupts hooked
 13h  5 BYTEs    interrupt numbers hooked by program
 18h  8 BYTEs    reserved
----------2FDD-------------------------------
INT 2F - MIXFIX.EXE - API
    AH = DDh
    AL = function
        00h installation check
        Return: AX = 00DDh if installed
                BX = version (BH = major, BL = minor)
        41h/61h get From: address
        Return: AX = 0001h
            ES:BX -> ASCIZ 4d address of mail sender ("1:2/3.4")
        49h/69h get To: address
        Return: AX = 0001h
            ES:BX -> ASCIZ 4d address of recipient ("1:2/3.4")
        4Ah/6Ah get subject of mail
        Return: AX = 0001h
            ES:BX -> ASCIZ subject of handled mail
        4Dh/6Dh get mail name
        Return: AX = 0001h
            ES:BX -> ASCIZ full name of current mail file
        4Eh/6Eh get From: field
        Return: AX = 0001h
            ES:BX -> ASCIZ From: field of mail (mail sender's name)
Program: MIXFIX by "KIV without Co" is a FidoNet mail robot which may execute
      other programs for mail handling.  The called programs may use the
      services described here to retrieve information about the mail being
      handled.
Index: installation check;MIXFIX.EXE
--------d-2FDD--BX7844-----------------------
INT 2F - xDISK v3.32+ - INSTALLATION CHECK
    AH = DDh
    BX = 7844h ('xD')
    CX = 4953h ('IS')
    DX = 4B3Fh ('K?')
    AL = desired drive (01h-1Ah) or 00h to check for xDISK on any drive
    ES:DI -> 25-byte data buffer (see #2355)
Return: AX = DDFFh if installed (on specified drive if AL nonzero on entry)
       BX = 87BBh
       DX = B4C0h
       ES:DI buffer filled
    CX,CF destroyed
SeeAlso: INT 21/AX=4404h"xDISK",INT 21/AX=4405h"xDISK"

Format of xDISK data buffer:
Offset    Size    Description    (Table 2355)
 00h    DWORD    pointer to ASCIZ driver signature "xDISK unit: X"
 04h    BYTE    flag: 01h if disk linked to DOS, 00h if unlinked
 05h    BYTE    flag: 01h if write protected, 00h if not
 06h    BYTE    flag: 01h if root directory full, 00h if not
 07h    BYTE    flag: 01h if free space uncompacted, 00h if compacted
 08h    BYTE    resizing state: 00h not resizable, 01h resized, 80h resizable
 09h    BYTE    flag: 01h inelastic resizable disk, 00h elastic
 0Ah  2 BYTEs    reserved
 0Ch    BYTE    flag: 01h collapsed disk, 00h not collapsed
 0Dh    BYTE    flag: 01h using all EMS, 00h some EMS free
 0Eh    BYTE    flag: 01h password enabled, 00h disabled
 0Fh    BYTE    flag: 01h password audio feedback, 00h no feedback
 10h    BYTE    flag: 01h password video feedback, 00h no feedback
 11h    BYTE    flag: 01h confirm changes, 00h no confirmation
 12h    BYTE    flag: 01h terse display, 00h verbose display
 13h    BYTE    flag: 01h click speaker on disk access, 00h no click
 14h    BYTE    flag: 01h flash icon on disk access, 00h no icon flash
 15h    BYTE    FAT entry size: 00h 12-bit, FFh 16-bit
 16h    WORD    count of open files in RAM disk
 18h    BYTE    unused
--------N-2FDE00BL00-------------------------
INT 2F U - Novell Netware - RPRINTER, NPRINTER - INSTALLATION CHECK
    AX = DE00h
    BL = 00h
Return: AL = FFh If Rprinter/Nprinter Installed
    BX -> Program Segment Prefix N/Rprinter.exe
--------Q-2FDE00BX4456-----------------------
INT 2F - DESQview v2.26+ External Device Interface - INSTALLATION CHECK
    AX = DE00h
    BX = 4456h ("DV")
    CX = 5844h ("XD")
    DX = 4931h ("I1")
Return: AL = FFh if installed (even if other registers do not match)
    if BX,CX, and DX were as specified on entry,
        BX = 4845h ("HE")
        CX = 5245h ("RE")
        DX = 4456h ("DV")
Range:    AH=C0h to AH=FFh, selected by scanning AH=DEh-FFh, then AH=C0h-DDh
Note:    the XDI handler should not issue any DOS or BIOS calls, nor should it
      issue DESQview API calls other than those allowed from hardware ints
SeeAlso: AX=DE02h,INT 15/AX=5400h
--------Q-2FDE01-----------------------------
INT 2F - DESQview v2.26+ External Device Interface - DRIVER CUSTOM SUBFUNCTION
    AX = DE01h
    BX = driver ID
    other registers as needed by driver
Notes:    XDI drivers should pass this call through to previous handler if ID
      does not match
    DESQview never calls this function
--------Q-2FDE01BX4450-----------------------
INT 2F U - Quarterdeck QDPMI.SYS v1.0 - INSTALLATION CHECK
    AX = DE01h
    BX = 4450h ("DP")
    CX = 4D49h ("MI")
    DX = 3039h ("09")
Return: AL = FFh if installed
        BX = 4D42h ("MB")
        CX = 4921h ("I!")
        DX = 8F4Fh
        ES:DI -> filename of DPMI host overlay
Note:    the installation check consists of testing for the existence of the
      character device QDPMI$$$
SeeAlso: INT 2F/AX=1687h,INT 31/AX=0000h
Index:    installation check;QDPMI
--------U-2FDE01BX5242-----------------------
INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, Ralf Brown's XDI drivers
    AX = DE01h
    BX = 5242h ("RB")
    CX:DX = program identifier
        656F7000h ("eop",0) for DVeop
Return: AX = 5242h ("RB") if installed
        ES:BX -> data or entry point (see #2356)
        CX = version number (CH = major, CL = minor)

(Table 2356)
Call DVeop entry point with:
    ES:DI -> callback address or 0000h:0000h to remove callback
Return: AX = status
        0000h failed (callback table full or attempted to remove non-
          existent callback)
        0001h successful
        ES:DI -> chaining address
    BX,CX,DX destroyed
Notes:    the callback function is called with a simulated interrupt when the
      DESQview window containing it is closed; it should perform all
      necessary cleanup and then perform a FAR jump to the chaining address
      or an IRET if the chaining address is 0000h:0000h
    if the program wishes to remove itself before the window is closed, it
      should call the DVeop entry point with the previously returned
      chaining address and ignore the returned chaining address.
--------U-2FDE01BX7474-----------------------
INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVTXDI.COM
    AX = DE01h
    BX = 7474h
    CL = function
        00h installation check
        Return: AL = FFh
        01h get process handle
        DX = keys on Open Window menu (DL = first, DH = second)
        Return: AX = process handle or 0000h if not running
        02h (v1.3+) set TMAN handle
        DX = TMAN process handle
        03h (v1.3+) set open keys to ignore on next CL=01h call
        DX = keys on Open Window menu (DL = first, DH = second)
Return: BX = 4F4Bh ("OK")
    DL destroyed
Note:    DVTXDI is distributed as part of the shareware products DVTree (DOS
     shell/DESQview process manager) and DVTMAN by Mike Weaver
Index:    installation check;DVTXDI
--------U-2FDE01BX7575-----------------------
INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVSIXDI.COM
    AX = DE01h
    BX = 7575h
    CX = function
        0000h installation check
        Return: AX = 00FFh if installed
        0001h turn on notification (currently unused)
        Return: AX = 0001h
        0002h turn off notification (currently unused)
        Return: AX = 0001h
        0003h get process information
        Return: AX = status
                0000h failed
                0001h successful
                BX = last instantaneous time slice
                    in 1/100s (v1.10)
                    in 1/18s (v1.11+)
                CX = number of processes
                DX = number of "(starting)" records (v2.00+)
                SI = number of records in process info array
                      (v2.00+) (always 15 for v1.x)
                ES:DI -> process info array (see #2357,#2358)
        0004h get version
        Return: AH = major version
            AL = minor version
        0005h (v1.10+) get time since DESQview started
        Return: DX:AX = 1/100s since DV start (v1.10)
            DX:AX = 1/18s since DV start (v1.11+)
        0006h (v1.10+) get number of task switches
        Return: DX:AX = total task switches
            CX = task switches in last instantaneous interval
Notes:    DVSIXDI is part of the DVSI (DESQview System Information) package by
      Daniel J. Bodoh
    for v1.00, function 0003h allocates common memory, which the caller
      must deallocate after reading the process information; only the
      currently used records are placed in the buffer
    for v1.10+, function 0003h merely returns a pointer to the internal
      array of process information; the caller should make a copy of the
      array while inside a critical section (see INT 15/AX=101Bh).    Only
      those records with bit 7 of the first byte set are valid.
Index:    installation check;DVSIXDI

Format of DVSIXDI v1.00 information for one process:
Offset    Size    Description    (Table 2357)
 00h    BYTE    flags
        bit 7: process slot is valid
 01h    WORD    offset into DESQVIEW.DVO of program's record if started from
          Open Windows menu, else undefined
 03h    WORD    Switch Windows window number
 05h    WORD    segment of process handle
 07h    WORD    number of tasks owned by process
 09h    WORD    mapping context of process (see #0320 at INT 15/AX=1016h)
 0Bh    DWORD    hook for other programs

Format of DVSIXDI v1.10-v2.00 information for one process:
Offset    Size    Description    (Table 2358)
 00h    BYTE    process flags (see #2359)
 01h    WORD    Open Window keys
 03h    WORD    Switch Windows number
 05h    WORD    segment of process handle
 07h    WORD    number of tasks for process
 09h    WORD    process mapping context
 0Bh    DWORD    time process started (relative to start of DESQview)
 0Fh    DWORD    time process last got CPU (relative to start of DESQview)
 13h    DWORD    time process last gave up CPU (relative to start of DESQview)
 17h    DWORD    total CPU time since process started
 1Bh    DWORD    CPU time at start of current instantaneous interval
 1Fh    DWORD    CPU time in current instantaneous interval
 23h    DWORD    hook for other programs
Note:    all times are in 1/100s for v1.10, in 1/18s for v1.11+

Bitfields for DVSIXDI process flags:
Bit(s)    Description    (Table 2359)
 7    valid record
 6    (v2.00+) record is allocated; if bit 7 clear, process is "(starting)"
      and only offsets 01h and 09h are valid
 5    (v2.00+) this app currently owns the CPU
 4    reserved (0)
 3    DESQview system task
 2    reserved (0)
 1    task has keyboard (currently unused)
 0    task swapped out (currently unused)
--------Q-2FDE01BXFFFE-----------------------
INT 2F U - DESQview v2.26+ XDI - DVXMS.DVR - ???
    AX = DE01h
    BX = FFFEh
    CX = 4D47h ("MG")
    DX = 0052h (0,"R")
Return: AL = FFh
    DX = 584Dh
--------Q-2FDE02-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DV INITIALIZATION COMPLETE
    AX = DE02h
    BX = mapping context of DESQview
    DX = handle of DESQview system task
Note:    driver should pass this call to previous handler after doing its work
SeeAlso: AX=DE03h,AX=DE0Fh,INT 15/AX=5400h
--------Q-2FDE03-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DV TERMINATION
    AX = DE03h
    BX = mapping context of DESQview
    DX = handle of DESQview system task
Notes:    driver should pass this call to previous handler before doing its work
    DESQview makes this call when it is exiting, but before unhooking any
      interrupt vectors
SeeAlso: AX=DE02h,AX=DE0Fh,INT 15/AX=5407h
--------Q-2FDE04-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - ADD PROCESS
    AX = DE04h
    BX = mapping context of new process (see #0320 at INT 15/AX=1016h)
    DX = handle of process
Return: nothing
Notes:    XMS XDI handler (installed by default) allocates a 22-byte record
      (see #2360) from "common" memory to control access to XMS memory
    all DOS, BIOS, and DV API calls are valid in handler
    driver should pass this call to previous handler after processing it
SeeAlso: AX=DE05h,AX=DE06h,INT 15/AX=5401h

Format of XMS XDI structure:
Offset    Size    Description    (Table 2360)
 00h    DWORD    pointer to 10-byte record???
 04h    DWORD    pointer to next XMS XDI structure
 08h    WORD    mapping context
 0Ah    BYTE    ???
 0Bh  5 BYTEs    XMS entry point to return for INT 2F/AX=4310h"XMS"
        (FAR jump to next field)
 10h  6 BYTEs    FAR handler for XMS driver entry point
        (consists of a FAR CALL followed by RETF)
--------Q-2FDE05-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - REMOVE PROCESS
    AX = DE05h
    BX = mapping context of process (see #0320 at INT 15/AX=1016h)
    DX = handle of last task in process
Return: nothing
Notes:    XMS XDI handler releases the structure allocated by AX=DE04h
    driver should pass this call to previous handler before processing it
    all DOS, BIOS, and DV API calls except those generating a task switch
      are valid in handler
SeeAlso: AX=DE04h,AX=DE07h,INT 15/AX=5402h
--------Q-2FDE06-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - CREATE TASK
    AX = DE06h
    BX = mapping context of process containing task
    DX = handle of new task
Notes:    driver should pass this call to previous handler after processing it
    all DOS, BIOS, and DV API calls are valid in handler
--------Q-2FDE07-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - TERMINATE TASK
    AX = DE07h
    BX = mapping context of process containing task
    DX = handle of task
Notes:    driver should pass this call to previous handler before processing it
    all DOS, BIOS, and DV API calls except those generating a task switch
      are valid in handler
SeeAlso: AX=DE04h,AX=DE06h,AX=DE10h
--------Q-2FDE08-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SAVE STATE
    AX = DE08h
    BX = mapping context of task being switched from
          (see #0320 at INT 15/AX=1016h)
    DX = handle of task being switched from
Notes:    invoked prior to task swap, interrupts, etc
    driver should pass this call to previous handler after processing it
SeeAlso: AX=DE09h,INT 15/AX=5403h,INT 15/AX=DE27h
--------Q-2FDE09-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - RESTORE STATE
    AX = DE09h
    BX = mapping context of task being switched to
          (see #0320 at INT 15/AX=1016h)
    DX = handle of task being switched to
Notes:    state is restored except for interrupts
    driver should pass this call to previous handler before processing it
SeeAlso: AX=DE08h,INT 15/AX=5404h,INT 15/AX=DE27h
--------Q-2FDE0A-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - CHANGE KEYBOARD FOCUS
    AX = DE0Ah
    BX = mapping context of task receiving focus
    DX = handle of running task
Notes:    driver should pass this call to previous handler before processing it
    this call often occurs inside a keyboard interrupt
    DV 2.42 does not provide this call to XDI handlers running inside a
      window; instead, it directly calls the INT 2F handler which was
      active at the time DV started
SeeAlso: INT 15/AX=DE26h,INT 15/AX=DE2Fh
--------Q-2FDE0B-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DVP PROCESSING COMPLETE
    AX = DE0Bh
    BX = mapping context of DESQview system task
    CX = number of system memory paragraphs required for the use of all
          XDI drivers (DV will add this to system memory in DVP buffer)
    DX = handle of DESQview system task
    SI = mapping context of new process if it starts
    ES:DI -> DVP buffer
Return: CX incremented as needed
Notes:    once DV invokes this function, the DVP buffer contents may be changed
    driver should pass this call to previous handler before processing it
--------Q-2FDE0C-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SWAP OUT PROCESS
    AX = DE0Ch
    BX = mapping context of task being swapped out
          (see #0320 at INT 15/AX=1016h)
    DX = handle of DESQview system task
Note:    driver should pass this call to previous handler after processing it
--------Q-2FDE0D-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SWAP IN PROCESS
    AX = DE0Dh
    BX = mapping context of process just swapped in
          (see #0320 at INT 15/AX=1016h)
    DX = handle of DESQview system task
Note:    driver should pass this call to previous handler before processing it
--------Q-2FDE0E-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DVP START FAILED
    AX = DE0Eh
    BX = mapping context of DESQview system task
    DX = handle of DESQview system task
    SI = mapping context of failed process (same as for call to AX=DE0Bh)
Note:    driver should pass this call to previous handler after processing it
--------Q-2FDE0F-----------------------------
INT 2F C - DESQview v2.50+ External Dev Interface - INITIALIZE DV
    AX = DE0Fh
Note:    DESQview 2.50+ calls this function just before it completes its
      initialization.  At the time of the call, DESQview has not yet
      changed any interrupt vectors
SeeAlso: AX=DE02h
--------Q-2FDE10-----------------------------
INT 2F C - DESQview v2.50+ External Dev Interface - FREE TASK
    AX = DE10h
    BX = mapping context of process (see #0320 at INT 15/AX=1016h)
    DX = task handle of process
Note:    DESQview 2.50+ calls this function before it frees the task; it is
      similar to AX=DE07h but allows the XDI handler to make calls which
      cause context switches
SeeAlso: AX=DE06h,AX=DE07h
--------c-2FDF00-----------------------------
INT 2F - HyperWare programs - INSTALLATION CHECK
    AX = DF00h
    BX = product code (see #2361)
    CX = 0000h
    DX = 0000h
Return: AL = status
        00h not installed
        FFh multiplex number in use
        CX = 5948h ('YH') if selected product installed
        ---HyperDisk---
        BX = code segment of resident portion
        DX = HyperDisk local data version
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range:    AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: INT 13/AX=8EEDh
Index:    installation check;HyperDisk|installation check;HyperStb
Index:    installation check;HyperKey|installation check;HyperScreen
Index:    HyperDisk;installation check|HyperStb;installation check
Index:    HyperKey;installation check|HyperScreen;installation check

(Table 2361)
Values for HyperWare product code:
 4248h    ('BH') HyperStb
 4448h    ('DH') HyperDisk v4.20+
 4B48h    ('KH') HyperKey
 5348h    ('SH') HyperScreen
--------Q-2FDF00BX5445-----------------------
INT 2F U - Quarterdeck TELTSR.COM - INSTALLATION CHECK
    AX = DF00h
    BX = 5445h ('TE')
    CX = 4C54h ('LT')
    DX = 5352h ('SR')
Return: BX = 5454h ('TT') if installed
    CX = 494Eh ('IN') if installed
    DX = 5454h ('ST') if installed
Program: TELTSR is a Telnet TSR included with Quarterdeck's DESQview/X v2.00
      which provides an INT 14h interface to the network
Range:    AH=DEh to AH=FFh and AH=C0h to AH=DDh, selected by scanning
SeeAlso: AX=DF01h"TELTSR",AX=DF02h"TELTSR",INT 14/AH=56h
--------N-2FDF01BX0000-----------------------
INT 2F U - MSG.COM - INSTALLATION CHECK
    AX = DF01h
    BX = 0000h
Return: AX = FDFFh if installed
       BX = segment of resident code
Program: MSG.COM is a TSR for intercepting incoming Novell broadcast
      messages written by Gary Dobbins ([e-mail])
--------c-2FDF01BX4448-----------------------
INT 2F - HyperDisk v4.50+ - GET CURRENT CACHE STATE
    AX = DF01h
    BX = 4448h ('DH')
Return: AX = 0000h if function supported
        BX = number of cache buffers in use
        CX = number of cache buffers which have been modified
        DL = caching flags (see #2362)
Range:    AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF02h

Bitfields for HyperDisk caching flags:
Bit(s)    Description    (Table 2362)
 0    staged writes enabled for floppy disks
 1    staged writes enabled for hard disks
 2    writes verified on floppy disks
 3    writes verified on hard disks
 4    reserved (0)
 5    reserved (0)
 6    floppy caching enabled
 7    all caching functions enabled
--------Q-2FDF01-----------------------------
INT 2F U - Quarterdeck TELTSR.COM - CLOSE CONNECTION
    AX = DF01h
Return: nothing???
Note:    invokes the DESQview/X socket API (see INT 15/AX=DE2Eh) function 0006h
      to close the socket corresponding to the file handle set with
      AX=DF02h; NOP if no file handle was ever set
SeeAlso: AX=DF00h"TELTSR",AX=DF02h"TELTSR"
--------c-2FDF02BX4448-----------------------
INT 2F - HyperDisk v4.50+ - SET CACHE STATE
    AX = DF02h
    BX = 4448h ('DH')
    DL = new caching flags (see #2362)
Return: AX = 0000h if supported
        BX = number of cache buffers in use
        CX = number of cache buffers which have been modified
        DL = previous caching flags (see #2362)
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range:    AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF01h
--------Q-2FDF02-----------------------------
INT 2F U - Quarterdeck TELTSR.COM - OPEN CONNECTION
    AX = DF02h
    BX = file handle for connection's socket
Return: AX = status
        0000h successful
        FFFFh no more room in TELTSR's JFT
Program: TELTSR is a Telnet TSR included with Quarterdeck's DESQview/X v2.00
Notes:    the indicated file handle becomes owned by TELTSR, and is closed in
      the caller's JFT
    multiple calls to this function will override the previous assignment
      without closing the previous file; use AX=DF01h before further calls
SeeAlso: AX=DF00h"TELTSR",AX=DF01h"TELTSR"
--------U-2FE000-----------------------------
INT 2F - SETDRVER.COM v2.10+ - INSTALLATION CHECK
    AX = E000h
Return: AX = 4A52h ("JR") if present
Program: SETDRVER is a public domain TSR by Jacob Rieper which sets the
      apparent DOS version analogously to MS-DOS SETVER
Notes:    this installation check differs from the usual one of returning AL=FFh
    the SETDRVER API is fully emulated by Matthias Paul's FREEVER
SeeAlso: AX=E000h/DX=4D50h,AX=E001h,INT 21/AH=52h
--------j-2FE000-----------------------------
INT 2F - KAOSHIDE - INSTALLATION CHECK
    AX = E000h
Return: AL = FFh if installed
Program: KAOSHIDE ('Hidden Kaos') is a PD joke TSR which randomly capitalizes
      alphabetic keys, written by Philip Maland. Although not a virus,
      v2.0 uses some viral-like techniques to hide itself from
      memory-reports by reducing DOS memory size.
--------U-2FE000DX4D50-----------------------
INT 2F - FREEVER v1.0+ - INSTALLATION CHECK
    AX = E000h
    DX = 4D50h ('MP')
Return: AL = FFh if installed
        AH = AMIS INT 2Dh multiplex ID
        CX = FREEVER version (CH=major, CL=minor)
        DX:DI -> AMIS-compliant signature (see #1904)
        (vendor ID is "M. Paul ", program name is "FREEVER ")
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
      to SETVER for any DOS-compatible OS, written by Matthias Paul
Note:    FREEVER emulates INT 21/AH=30h, INT 21/AX=3306h, INT 21/AX=4412h,
      INT 21/AX=4452h, and SETDRVER's API on INT 2F/AX=E00xh, as well as
      providing an AMIS API on INT 2Dh
SeeAlso: AX=E000h"SETDRVER",INT 21/AH=30h,INT 21/AX=3306h,INT 21/AX=4452h
--------K-2FE000DX5354-----------------------
INT 2F - StuffIt v3.21+ - INSTALLATION CHECK
    AX = E000h
    DX = 5354h ("ST")
Return: AL = FFh if installed
        BX = version (BH = major, BL = BCD minor)
        DX = segment of resident code
Program: StuffIt is a freeware delayed keyboard stuffer by Terje Mathisen
--------U-2FE001-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET SETDRVER VERSION
    AX = E001h
Return: AH = major version
    AL = minor version
SeeAlso: AX=E000h
--------U-2FE002-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET ORIGINAL DOS VERSION INFO
    AX = E002h
Return: AL = FFh if successful
        BH = major DOS version
        BL = minor DOS version
        CH = DOS version flag
        CL = OEM number
        DH = major DR DOS version number (FFh if unknown)
        DL = minor DR DOS version number (FFh if unknown)
SeeAlso: AX=E003h,AX=E007h,INT 21/AH=30h
--------U-2FE003-----------------------------
INT 2F - SETDRVER.COM v2.10+ - RESET INTERNAL VARIABLES
    AX = E003h
    BH = new major DOS version
    BL = new minor DOS version
    CH = new DOS version flag
    CL = new DOS revision number
    DH = new OEM number
SeeAlso: AX=E002h
--------U-2FE004-----------------------------
INT 2F - SETDRVER.COM v2.10+ - ENABLE TSR
    AX = E004h
Return: AL = FFh if successful
SeeAlso: AX=E000h,AX=E005h,AX=E006h
--------U-2FE005-----------------------------
INT 2F - SETDRVER.COM v2.10+ - DISABLE TSR
    AX = E005h
Return: AL = FFh if successful
SeeAlso: AX=E000h,AX=E004h,AX=E006h
--------U-2FE006-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET TSR STATUS
    AX = E006h
Return: AL = FFh if successful
        BL = status
        01h resident and active
        02h resident and inactive
--------U-2FE007-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET TaskMAX STATUS AT INSTALLATION
    AX = E007h
Return: AL = FFh if successful
        BL = status
        00h if TaskMAX not loaded before SETDRVER
        FFh if TaskMAX was loaded before SETDRVER
SeeAlso: AX=E003h
--------U-2FE0-------------------------------
INT 2F - SETDRVER.COM - RESERVED FOR FUTURE USE
    AH = E0h
    AL = 08h-10h
--------K-2FE100-----------------------------
INT 2F - Phantom2 v1.1+ - INSTALLATION CHECK
    AX = E100h
Return: AX = 0001h if installed
        DS:SI -> ASCIZ hotkey name
        DS:DI -> ASCIZ recording filename
Program: Phantom of the Keyboard II is a shareware keystroke recorder/replayer
      by P2 Enterprises
SeeAlso: AX=E101h,AX=E102h,AX=E103h,AX=E300h
Index:    hotkeys;Phantom2
--------K-2FE101-----------------------------
INT 2F - Phantom2 v1.1+ - FUNCTION REQUEST
    AX = E101h
    BX = function mask (see #2363)
    CX = code for hotkey (as returned by INT 16/AH=00h) if BX bit 6 set
    DS:DX -> ASCIZ filespec if BX bit 7 set
SeeAlso: AX=E100h
Index:    hotkeys;Phantom2

Bitfields for Phantom2 function mask:
Bit(s)    Description    (Table 2363)
 0    record
 1    play
 2    QuickPlay
 3    loop
 4    mode display toggle
 5    sound toggle
 6    set hotkey
 7    set filespec
--------K-2FE102-----------------------------
INT 2F - Phantom2 v1.1+ - UNINSTALL
    AX = E102h
Return: AX = status
        0001h removal successful
        0002h not installed as TSR
        FFFFh disabled but not removed
SeeAlso: AX=E100h
--------K-2FE103-----------------------------
INT 2F - Phantom2 v2.8 - SET ??? FLAG
    AX = E103h
Return: AX = 0001h
SeeAlso: AX=E100h
--------y-2FE200-----------------------------
INT 2F - SecureDevice - LOGIN TO DRIVE
    AX = E200h
    DL = drive number (0 = A:)
    DS:SI -> 104-byte key
Return: AL = status
        00h unable to determine key's validity
        01h key is valid
        FFh key is invalid
Program: SecureDevice is a copylefted device driver by Max Loewenthal and
      Arthur Helwig which turns one or more disk files into encrypted
      logical drives
SeeAlso: AX=E201h,AX=E203h,AX=E209h
--------y-2FE201-----------------------------
INT 2F - SecureDevice - GET INFORMATION
    AX = E201h
    DX = driver index (0000h = first loaded)
Return: AL = number of volumes handled by driver
    DL = drive number of first volume (00h = A:)
SeeAlso: AX=E200h,AX=E203h,AX=E209h
--------y-2FE203-----------------------------
INT 2F - SecureDevice - DESTROY PASSWORD (LOGOUT FROM DRIVE)
    AX = E203h
    DL = drive number (00h = A:) or FFh for all drives
Return: nothing
SeeAlso: AX=E200h,AX=E209h
--------y-2FE209DX0000-----------------------
INT 2F - SecureDevice - INSTALLATION CHECK
    AX = E209h
    DX = 0000h
Return: AX = 1DEAh if installed
        DX = number of drivers installed
--------K-2FE300-----------------------------
INT 2F - ANARKEY.COM - INSTALLATION CHECK
    AX = E300h
Return: AL = state
        00h not installed
        FEh if installed but suspended (v3.0+)
        FFh installed
Program: ANARKEY.COM is a commandline recall program by Steven Calwas
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=E100h,AX=E301h,AX=E302h,AX=E303h,AX=E304h,AX=E305h,AX=E306h
SeeAlso: AX=E307h,INT 66"Newkey"
--------V-2FE300-----------------------------
INT 2F - Blank - INSTALLATION CHECK
    AX = E300h
Return: AL = FFh if installed
        ES = resident code segment
Program: Blank is a shareware screen blanker by Yonah Schmeidler
Note:    AH=E3h is the default, which may be reconfigured by the installation
      program in the registered version
SeeAlso: AH=93h,AX=C050h,INT 14/AX=AA01h
Index:    screen saver;Blank
--------K-2FE301-----------------------------
INT 2F U - ANARKEY.COM v2+ - GET ???
    AX = E301h
Return: DX:BX -> ??? (see #2364,#2365)
SeeAlso: AX=E300h

Format of returned data structure for ANARKEY v2.0:
Offset    Size    Description    (Table 2364)
 -7   7 BYTEs    signature ('ANARKEY')
 00h    WORD    ??? (I see 0001h in v2.0)
 02h    WORD    ??? (I see 0001h in v2.0)
 04h    WORD    ??? (I see 0 in v2.0)
 06h    WORD    PSP segment of next program loaded

Format of returned data structure for ANARKEY v3+:
Offset    Size    Description    (Table 2365)
 -1    BYTE    multiplex number
 00h    WORD    ??? (I see 0001h in v3.0-4.0)
 02h    WORD    ??? (I see 0001h in v3.0-4.0)
 04h    BYTE    ??? (I see 0 in v3.0-4.0)
 05h    WORD    PSP segment of next program loaded
--------K-2FE302-----------------------------
INT 2F U - ANARKEY.COM v3+ - ???
    AX = E302h
    BL = ???
Return: ???
SeeAlso: AX=E300h
--------K-2FE303-----------------------------
INT 2F U - ANARKEY.COM v3+ - ANARKMD API
    AX = E303h
    BL = function
        01h toggle insert mode
        02h display contents of history buffer
        03h write history buffer to file
        ES:DX -> file name
        04h clear history buffer
        05h undefine all aliases
        06h show aliases
        07h list programs using Unix switchar
        08h jump to bottom of history buffer
        09h (v4.0) add string to history buffer
        ES:DX -> ASCIZ string
        0Ah (v4.0) ???
        ES:DX -> ???
        0Bh (v4.0) copy string to edit buffer for use as next input line
        ES:DX -> ASCIZ string
        0Ch (v4.0) ???
        0Dh (v4.0) copy ??? to ???
        0Eh (v4.0) ???
        0Fh (v4.0) ???
        10h (v4.0) set ??? flag
        11h (v4.0) display error message about running in EMS under Windows
Return: ???
SeeAlso: AX=E300h
--------K-2FE304-----------------------------
INT 2F U - ANARKEY.COM v2+ - ???
    AX = E304h
    BL = ???
Return: ???
SeeAlso: AX=E300h
--------K-2FE305-----------------------------
INT 2F U - ANARKEY.COM v3+ - ENABLE/SUSPEND ANARKEY
    AX = E305h
    BL = new state
        01h suspended
        00h enabled
SeeAlso: AX=E300h
--------K-2FE306-----------------------------
INT 2F U - ANARKEY.COM v4.0 - GET ???
    AX = E306h
Return: AX = ???
SeeAlso: AX=E300h
--------K-2FE307-----------------------------
INT 2F U - ANARKEY.COM v4.0 - GET ???
    AX = E307h
Return: AX = ???
    BL = ???
SeeAlso: AX=E300h
--------K-2FE337-----------------------------
INT 2F - INT16.COM - INSTALLATION CHECK
    AX = E337h
Return: AX = 0013h if installed
Program: INT16.COM is an INT16 keyboard BIOS replacement for
      INT 16/AH=00h-02h,10h-12h (based on K3) written by Martin Gerdes
      and published in c't 05/1990.
SeeAlso: AX=ED58h
--------l-2FE44D-----------------------------
INT 2F - NDOS - API
    AX = E44Dh
Program: NDOS is a version of 4DOS licensed to Symantec for inclusion in the
      Norton Utilities
Note:    as NDOS is a licensed version of 4DOS v3.03, the API is identical to
      that for 4DOS, except that AH=E4h instead of D4h and the installation
      check returns AX=44EEh instead of AX=44DDh
SeeAlso: AX=D44Dh,AX=E44Eh
--------l-2FE44E-----------------------------
INT 2F C - NDOS - AWAITING USER INPUT
    AX = E44Eh
    BX = condition
        0000h NDOS is ready to display prompt
        0001h NDOS has displayed the prompt, about to accept user input
Return: handler must preserve SI, DI, BP, SP, DS, ES, and SS
SeeAlso: AX=E44Dh
--------K-2FE44FBX0000-----------------------
INT 2F - NDOS v4.0+ - KSTACK.COM - INSTALLATION CHECK
    AX = E44Fh
    BX = 0000h
Return: AX = 44EEh if installed
Program: NDOS is a version of 4DOS licensed to Symantec for inclusion in the
      Norton Utilities
Note:    this function is also supported by ANSIPLUS v3.01+ and K3PLUS v6.20+,
      which emulate the 4DOS and NDOS keystack
SeeAlso: AX=D44Fh/BX=0000h,AX=E44Fh/BX=0001h
--------K-2FE44FBX0001-----------------------
INT 2F - NDOS v4.0+ - KSTACK.COM - PLACE KEYSTROKES INTO KEYSTACK
    AX = E44Fh
    BX = 0001h
    CX = number of keystrokes (01h-FFh)
    DS:DX -> keystroke list (one word per keystroke)
Return: AX = status
        0000h successful
        nonzero failed
    BX,CX,DX destroyed
Notes:    the keystrokes are the exact values to return from subsequent calls to
      INT 16 with AH=00h,01h,10h, or 11h, with the following exceptions:
        0000h causes subfunctions 01h and 11h to indicate an empty
              keyboard buffer
        FFFFh is followed by a word indicating the number of clock
              ticks to delay before the next faked keystroke
    v4.00 KSTACK overwrites any unread keystrokes from the previous
      invocation, and does not range-check CX; it will overwrite memory
      following the resident portion if CX is greater than 100h.
    this function is also supported by ANSIPLUS v3.01+ and K3PLUS v6.20+,
      which emulate the 4DOS and NDOS keystack
SeeAlso: AX=E44Fh/BX=0000h,INT 16/AH=00h,INT 21/AX=4403h"DOS"
--------U-2FE600CL30-------------------------
INT 2F - Virtual 486 - INSTALLATION CHECK
    AX = E600h
    CL = 30h
    BX = C0DEh
Return: BX = DEC0h if installed
Program: Virtual 486 is a 80486 CPU emulator for an 80386 by Solar Designer
----------2FE700BX4158-----------------------
INT 2F - Multiplex - ??? - INSTALLATION CHECK???
    AX = E700h
    BX = 4158h ("AX")
    CX = 4953h ("IS")
    DX = 4845h ("HE")
Return: AL = FFh if installed
        BX = 4C4Fh ("LO") if ??? installed
        CX = 4F4Bh ("OK")
        DX = 4F55h ("OU")
        ES:DI -> ???
Range:    AH=C0h to AH=FFh, selected by scanning AH=E7-FFh, then AH=C0h-E6h
Note:    called by QDPMI when its Real to Protected Mode Switch Entry Point
      is called
--------f-2FE77EBX0000-----------------------
INT 2F - CTDEMN - INSTALLATION CHECK
    AX = E77Eh
    BX = 0000h
    CX = 4F4Dh ('OM')
    DX = 5453h ('TS')
Return: AX = 7EE7h if installed
        BX = resident code segment
        CX = 6F6Dh ('om')
        DX = 7473h ('ts')
Program: CTDEMN is a file daemon TSR by Simultan AG
--------E-2FED00-----------------------------
INT 2F - Phar Lap DOS EXTENDERS - INSTALLATION CHECK
    AX = ED00h
    BL = DOS extender ID (see #2366)
Return: AL = status
        00h not installed
        FFh installed
        SI = 5048h ("PH")
        DI = 4152h ("AR")
        CH = major version number
        CL = minor version number
        DX = flags
            bit 0: running under DPMI
            bit 1: running under Phar Lap VMM
        if running under DPMI:
            BX = DPMI version (BH = major, BL = minor)
SeeAlso: AH=A1h,AX=F100h,AX=FBA1h

(Table 2366)
Values for Phar Lap DOS extender ID:
 01h    286dosx v1.3+ (Software Development Kit)
 02h    286dosx v1.3+ (Run-Time Kit)
 03h    386dosx v4.0+ (SDK)
 04h    386dosx v4.0+ (RTK)
--------E-2FED03-----------------------------
INT 2F R - Phar Lap 386/DOS-Extender v4.1 - GET EXTENDER ENTRY POINT
    AX = ED03h
    CX = real-mode code segment
    DX = real-mode data segment
Return: CF clear if successful
        CX = protected-mode code segment selector
        DX = protected-mode data segment selector
        ES:DI -> real-mode entry point for calling protected-mode functions
              (see INT 21/AX=250Dh)
    CF set on error
        AX = error code
        0008h unable to allocate LDT descriptors
--------E-2FED10BL05-------------------------
INT 2F - Pharlap DOS Extender - ???
    AX = ED10h
    BL = 05h
    ES:SI -> ??? structure
Return: AX = ???
    SI = ???
    DI = ???
SeeAlso: AX=ED00h,AX=ED11h
--------E-2FED11BL05-------------------------
INT 2F - Pharlap DOS Extender - FATAL EXIT TO REAL MODE ???
    AX = ED11h
    BL = 05h
    CX = ???
    DX = ???
    ES:SI -> ??? structure
    SS:SP = new stack ???
Return: ???
Note:    called immediately prior to terminating program with INT 21/AX=4CFFh
SeeAlso: AX=ED00h,AX=ED10h
--------K-2FED58-----------------------------
INT 2F U - K5.COM - INSTALLATION CHECK
    AX = ED58h
Return: AX = 000Dh if installed
        ES = resident code segment
        BX = ??? (9999h)
        ???
Program: K5 is an extended keyboard driver by Martin Gerdes, based on his K3
SeeAlso: AX=E337h,INT 16/AX=AF20h
--------E-2FED80-----------------------------
INT 2F - Phar Lap 286|DOS Extender Lite v2.5 - ???
    AX = ED80h
    BL = DOS extender ID (see #2366)
    SI = 5048h ("PH")
    DI = 4152h ("AR")
    ???
Return: ???
--------O-2FEDC8BX0000-----------------------
INT 2F - Novell ??? - INSTALLATION CHECK???
    AX = EDC8h ('EDC' = Novell European Development Center)
    BX = 0000h
    CX = 0000h
    DX = 1234h
Return: ???
Desc:    called by Novell DOS 7 LOCK command during installation; purpose
      unknown
--------y-2FEE00-----------------------------
INT 2F - GRIDLOC.EXE - INSTALLATION CHECK
    AX = EE00h
Return: AL = FFh if installed
Program: GRIDLOC is a PC security program by Intelligent Security Systems, Inc.
SeeAlso: INT 21/AH=40h"NB.SYS"
--------U-2FEE00-----------------------------
INT 2F - XVIEW - INSTALLATION CHECK
    AX = EE00h
Return: AX = 00FFh if installed
Program: XVIEW is a hypertext viewer by Flambeaux Software, Inc.
--------N-2FEE00-----------------------------
INT 2F - WEB v4.02 - INSTALLATION CHECK
    AX = EE00h
Return: AL = status
        00h not installed
        FFh installed
Program: WEB is an IPX-based peer-to-peer network by Webcorp.
SeeAlso: AH=EEh"WEB",AX=EEF0h
--------U-2FEE01-----------------------------
INT 2F - XVIEW - POP UP GIVING TOPIC SEARCH KEYWORD
    AX = EE01h
    DS:DX -> ASCIZ string containing case-insensitive keyword to look up
Return: AX = status (see #2367)
Note:    the specified keyword should be a hyperlink in the _IndexPage of some
      database; the current database is searched first
SeeAlso: AX=EE00h"XVIEW",AX=EE02h,AX=EE03h,AX=EE04h,AX=EE06h

(Table 2367)
Values for XVIEW function status:
 0000h    successful
 00F1h    unknown subfunction
 00F2h    unable to pop up
--------U-2FEE02-----------------------------
INT 2F - XVIEW - POP UP GIVING A PAGE NUMBER
    AX = EE02h
    DX = physical page number or anchor page number (see #2368)
Return: AX = status (see #2367)
Note:    physical page numbers are assigned by the hypertext compiler, and
      will change if a page is inserted in the middle
SeeAlso: AX=EE00h"XVIEW",AX=EE01h,AX=EE05h,AX=EE06h

(Table 2368)
Values for XVIEW anchor page number:
 FFEAh    _Credits
 FFECh    _SearchTopics
 FFEDh    _SearchText
 FFF0h    _ManualList
 FFF5h    _HelpOnHelp
 FFF8h    _HomePage
 FFF9h    _IndexPage
--------U-2FEE03-----------------------------
INT 2F - XVIEW - POP UP GIVING FILENAME AND SEARCH TOPIC OR PAGE NUMBER
    AX = EE03h
    DS:DX -> data packet (see #2369)
Return: AX = status (see #2367)
SeeAlso: AX=EE00h"XVIEW",AX=EE01h,AX=EE02h,AX=EE06h

Format of XVIEW data packet:
Offset    Size    Description    (Table 2369)
 00h    DWORD    -> ASCIZ database filespec (0000h:0000h for current database)
 04h    DWORD    -> ASCIZ text to look up or 0000h:0000h
 08h    WORD    page number (0000h if keyword used)
 0Ah  6 BYTEs    reserved
--------U-2FEE04-----------------------------
INT 2F - XVIEW - POP UP AND READ SCREEN FOR SEARCH TOPIC KEYWORD
    AX = EE04h
Return: AX = status (see #2367)
Note:    equivalent to the action taken when the user presses the Alt-L hotkey
SeeAlso: AX=EE00h"XVIEW",AX=EE01h,AX=EE03h,AX=EE06h
--------U-2FEE05-----------------------------
INT 2F - XVIEW - POP UP TO MOST-RECENTLY VIEWED PAGE
    AX = EE05h
Return: AX = status (see #2367)
Note:    equivalent to the action taken when the user presses the Alt-H hotkey
SeeAlso: AX=EE00h"XVIEW",AX=EE02h,AX=EE06h
--------U-2FEE06-----------------------------
INT 2F - XVIEW - WAIT FOR POP-DOWN AND GET EXIT CODE
    AX = EE06h
Return: AX = status (see also AX=EE01h)
        0001h specified filename is not an xText database
        0002h no databases found
        0003h bad data in file
        0004h memory shortage
        0005h unable to open the requested file
        0007h invalid page number for file
Note:    although this call is not required, the exit code can alert the
      caller to problems; if the call is not made, the program should
      enforce a delay of about 1/2 second to allow the viewer to pop up,
      and should not get keyboard input or attempt disk accesses during
      the delay
SeeAlso: AX=EE00h"XVIEW",AX=EE01h,AX=EE02h,AX=EE03h,AX=EE04h,AX=EE05h
--------N-2FEE-------------------------------
INT 2F - WEB v4.02 - WEB MODULE INSTALLATION CHECK
    AH = EEh
    AL = module ID (see #2370)
Return: AX = 0000h if installed
        ES:DI -> far entry point for module-specific API calls
          (see #2371,#2372,#2373,#2374,#2375)
Program: WEB is an IPX-based peer-to-peer network by Webcorp.
SeeAlso: AX=EE00h"WEB"

(Table 2370)
Values for WEB module ID:
 10h    server module (SERVER.EXE)
 20h    client module (CLIENT.EXE)
 30h    mail module (MAIL.EXE)
 40h    spooler (PCSPOOL.EXE)
 50h    kernel module (KERNEL.EXE)
 60h    SAP module (KERNEL.EXE)
 70h    resident station manager (SM.EXE)
 90h    router module (ROUTER.EXE)

(Table 2371)
Call server module entry point with:
    BX = function
        0000h remove server module
        Return: AX = status (0000h if successful, else WEB error code)
        0001h create SYSINFO file
        Note:    the SYSINFO file is used by the station manager when
              displaying info for a particular station
        0002h get server object table
        Return: CX = number of server objects
            ES:DI -> server object table
        Note:    server objects include drives and devices that the
              server module controls
        0003h get server variables
        Return: ES:DI -> server variables

(Table 2372)
Call client module entry point with:
    BX = function
        0000h remove client module
        Return: AX = status (0000h if successful, else WEB error code)
        0001h decrement client-only flag
        0002h increment client-only flag
        0005h set device capture
        Note:    decrements DeviceOutput flag, telling the spooler that
              it may trap device output again
        0006h clear device capture
        Note:    increments DeviceOutput flag, telling the spooler that
              it should not trap device output (this is used
              internally by the spooler to prevent it from trapping
              its own output)
        0007h get client debug pointer
        Return: ES:DI -> client debug data structure (see #2376)
        0008h get root drive
        Return: AL = WEB startup drive
        0009h get maximum possible drive/device redirections
        Return: AL = maximum drive redirections
            CH = maximum LPTx redirections
            CL = maximum COMx redirections
        000Ah suspend client
        Return: AX = previous value of Suspend flag
        000Bh resume client
        Return: AX = previous value of Suspend flag
        000Ch get instance data
        CX = maximum number of structures in array
        ES:DI -> buffer for array of WIN_INSTANCE_DATA structures
              (see #2377)
        Return: CX = number of structures actually returned
        Note:    used internally by WEB4WIN

(Table 2373)
Call mail module entry point with:
    BX = function
        0000h remove mail module
        Return: AX = status (0000h successful, else WEB error code)
        0001h set mail poll
        Note:    schedules the WEB mail module
        0002h set mail notify
        Note:    sets the Notify flag, which determines whether the
              user will be notified when mail is received
        0003h clear mail notify
        Note:    clears the Notify flag, which determines whether the
              user will be notified when mail is received
        0004h check whether new mail has arrived
        Return: AL = new mail status
                00h no new mail since last call
                else new mail has arrived
        Note:    also clears the new-mail flag after retrieving it
        0005h send notify
        ES:DI -> name of WEB user to be notified
        0006h get post office
        Return: ES:DI -> full network path of Post Office subdirectory

(Table 2374)
Call spooler entry point with:
    BX = function
        0000h remove PCSpool module
        Return: AX = status (0000h successful, else WEB error code)
        0001h set spooler poll
        Note:    schedules the WEB spooler
        0002h check spooler changed
        Return:    AX = 0000h
        Note:    this call is a NOP in current versions of WEB

(Table 2375)
Call kernel entry point with:
    BX = function
        0000h remove kernel module
        Return: AX = status (0000h successful, else WEB error code)
        0001h set kernel ^S filter
        DL = new state (00h don't filter ^S, nonzero do filter)
        0002h get kernel data area
        Return: ES:DI -> kernel data area
        0003h display dialog box
        CL = dialog box type
            00h password
            01h E-Note received notification
            02h Novell login
            03h general notification
        DL = number of rows to display
        ES:SI -> array of far pointers to rows to be displayed
        ES:DI -> Pascal-style input buffer
        Return: AX = status (0000h successful, else error code)
        0004h kernel service events
        0005h get kernel's in-critical-section flag
        Return: ES:DI -> kernel InCriticalSection flag
        0006h schedule DOS event
        AL = directive
            00h do not ignore WEB ExtraBusy flag
            01h ignore ExtraBusy flag
            02h (WEB4WIN) check that current Windows VM is foregrnd VM
        ES:SI -> WEB AES Event Control Block (ECB) (see #2378)
        Notes:    the WEB Asynchronous Event Scheduler is similar to the
              one used by IPX; this call schedules a special ECB
              to be executed at a later time.  Unlike IPX ECBs,
              the timeout must be set explicitly by the caller
            this function also calls function 0004h
        0007h check busy
        AL = directive
            00h do not ignore WEB ExtraBusy flag
            01h ignore ExtraBusy flag
            02h (WEB4WIN) check that current Windows VM is foregrnd VM
        Return: AX = status (0000h not busy, else busy)
        0008h set keyboard intercept
        Note:    currently a NOP which returns immediately
        0009h get keyboard intercept
        Note:    currently a NOP which returns immediately
        000Ah get dialog flags
        Return: ES:DI -> kernel dialog flags (see #2379)
        000Bh get network path
        Return: ES:DI -> fully-qualified network path of file where
                the screen is stored on Dialog calls
        000Ch kernel alternate dialog
        CL = dialog box type
            00h password
            01h E-Note received notification
            02h Novell login
            03h general notification
        DL = number of rows to display
        ES:SI -> array of far pointers to rows to be displayed
        ES:DI -> Pascal-style input buffer
        Return: AX = status (0000h successful, else error code)
        Note:    this function is identical to function 0003h except
              that it does not notify WEB4WIN of the impending
              dialog request
        000Dh get machine/operating system type
        Return: AX = machine/operating system type
                01h IBM PC, MS-DOS
                02h IBM PC, DOSV (Japanese)
                03h NEC PC-9800, JDOS (Japanese)
                04h IBM PC, Korean DBC DOS

Format of client debug data structure:
Offset    Size    Description    (Table 2376)
 00h    WORD    total files
 02h    WORD    files free
 04h    WORD    no files
 06h    WORD    minimum files
 08h    WORD    total FCBs
 0Ah    WORD    total safe FCBs
 0Ch    WORD    FCBs in use
 0Eh    WORD    wrong FCB
 10h    WORD    compressed
 12h    WORD    retransmits

Format of WIN_INSTANCE_DATA structure:
Offset    Size    Description    (Table 2377)
 00h    DWORD    real-mode pointer to data to be instanced
 04h    WORD    size of data to be instanced

Format of WEB AES Event Control Block:
Offset    Size    Description    (Table 2378)
 00h    DWORD    link address
 04h    WORD    ESR address
 08h    BYTE    InUse flag
 09h    BYTE    completion code
 0Ah  3 BYTEs    reserved
 0Dh    WORD    timeout
 0Fh    BYTE    IgnoreExtra flag
 10h    WORD    PSP
 12h    DWORD    DTA
 16h    WORD    AX value for DOS critical information
 18h    WORD    BX value for DOS critical information
 1Ah    WORD    CX value for DOS critical information
 1Ch    WORD    DX value for DOS critical information

(Table 2379)
Values for kernel dialog flags:
 01h    dialog will timeout
 02h    display stars instead of entered keystrokes
--------N-2FEEF0-----------------------------
INT 2F - WEB v4.02 - WEB GENERAL NOTIFICATION
    AX = EEF0h
    BX = notification function ID (see #2380)
Return: varies by notification function
Program: WEB is an IPX-based peer-to-peer network by Webcorp.
Note:    the notification functions are used internally by WEB modules to notify
      other modules and external programs of actions or event, and should
      never be called by an application
SeeAlso: AX=EE00h"WEB"

(Table 2380)
Values for WEB Notification Function ID:
 00h    node added
 01h    node deleted
 02h    dial attempt
 03h    dial failed
 04h    file close
 05h    close connection
 07h    check Windows mode
 20h    link up
 21h    link down
--------K-2FF000-----------------------------
INT 2F U - 4MAP - INSTALLATION CHECK
    AX = F000h
Return: AX = 00FFh
Program: 4MAP is a keybinding program for 4DOS (see AX=D44Dh) by Ho-Ping Tseng
Note:    returns AX=00FFh for any value of AL not listed here
SeeAlso: AX=D44Dh,AX=F001h,AX=F002h
--------K-2FF001-----------------------------
INT 2F U - 4MAP - GET KEY MAPPINGS
    AX = F001h
Return: ES:BX -> key mappings
SeeAlso: AX=F000h
--------K-2FF002-----------------------------
INT 2F U - 4MAP - INSERT CHARACTER INTO ???
    AX = F002h
    BL = character to insert
Return: AX = status
        0000h successful
        0001h buffer full
SeeAlso: AX=F000h,AX=F003h
--------K-2FF003-----------------------------
INT 2F U - 4MAP - INSERT CHARACTER INTO ???
    AX = F003h
    BL = character to insert
Return: AX = status
        0000h successful
        0001h buffer full
Program: 4MAP is a keybinding program for 4DOS (see AX=D44Dh) by Ho-Ping Tseng
SeeAlso: AX=F000h,AX=F002h
--------m-2FF1-------------------------------
INT 2F U - MIN-MEM v2.11 - INSTALLATION CHECK
    AH = F1h
    AL <> F1h
Return: AL = F1h if installed
Program: MIN-MEM is a shareware TSR manager by Biologic which permits up to 24
      popup TSRs to be loaded but swapped out to disk, EMS, or XMS.     One
      TSR at a time is brought back into memory at the user's request.
--------E-2FF100-----------------------------
INT 2F - DOS EXTENDER INSTALLATION CHECK
    AX = F100h
Return: AL = FFh if DOS extender present
        SI = 444Fh ("DO")
        DI = 5358h ("SX")
Note:    supported or soon to be supported by Phar Lap, Rational, Ergo, and IGC
SeeAlso: AH=A1h,AX=ED00h,AX=FBA1h/BX=0081h,INT 15/AX=BF02h
--------W-2FF200-----------------------------
INT 2F - WINX - INSTALLATION CHECK
    AX = F200h
Return: AX = 00FFh if installed
Program: WINX is a DOS/Windows utilities by Al Williams which can be used to
      launch Windows applications from a DOS Box; it was published in
      "DOS and Windows Protected Mode-Programming with DOS Extenders"
      (Addison-Wesley) and should not be confused with the Windows driver
      of the same name which is part of the DESQview/X package
--------W-2FF201-----------------------------
INT 2F - WINX - RETURN ADDRESS OF SERVER BUFFER
    AX = F201h
Return: AX = status
        FFFFh if WINX is busy processing a different request
        0000h if successful
        BX:CX = address of server buffer (see #2381)

Format of WINX server buffer:
Offset    Size    Description    (Table 2381)
 00h    BYTE    command/status
        00h buffer available
        01h buffer contains result
        02h change directory
        03h execute program
        FFh terminate windows portion of WINX
 01h  ? BYTEs    command (03h) or directory (02h)
  or
 01h    DWORD    result (01h)
--------W-2FF202-----------------------------
INT 2F - WINX - SET SERVER'S WORKING DIRECTORY
    AX = F202h
    BX:CX -> directory
Return: AX = status
        FFFFh if WINX is busy processing a different request
        0000h if successful
SeeAlso: AX=F200h,AX=F203h
--------W-2FF203-----------------------------
INT 2F - WINX - EXECUTE COMMAND
    AX = F203h
    BX:CX -> command
Return: AX = status
        0000h if successful
        FFFFh if WINX is busy processing a different request
SeeAlso: AX=F200h,AX=F202h
--------G-2FF400-----------------------------
INT 2F - FINDIRQ.COM - INSTALLATION CHECK
    AX = F400h
Return: AL = 01h if installed
Program: FINDIRQ is a program by Rick Knoblaugh published in the 9/28/93 issue
      of PC Magazine; when run as a TSR it can determine which IRQs are
      used only when a device is active
SeeAlso: AX=F401h
--------N-2FF400-----------------------------
INT 2F - PowerLAN - INSTALLATION CHECK???
    AX = F400h
    ???
Return: ???
Note:    this function is called by PowerLAN's NET.EXE just prior to calling
      AX=F401h (get version)
SeeAlso: AX=F401h"PowerLAN"
--------N-2FF401-----------------------------
INT 2F - PowerLAN - GET VERSION
    AX = F401h
Return: ES:BX -> WORD containing 100*version (in decimal)
Program: PowerLAN is a networking product by Performance Technology
SeeAlso: AX=F400h"PowerLAN",AX=F483h"PowerLAN"
--------G-2FF401CX5121-----------------------
INT 2F - FINDIRQ.COM - GET HOOKED INTERRUPTS
    AX = F401h
    CX = 5121h ('Q!')
Return: AX:DX -> hooked interrupt table (see #2382)
SeeAlso: AX=F400h

Format of FINDIRQ hooked interrupt table:
Offset    Size    Description    (Table 2382)
 00h    BYTE    1Ch
 01h    DWORD    FINDIRQ's INT 1C handler
 05h    DWORD    original INT 1C handler
 09h    BYTE    28h
 0Ah    DWORD    FINDIRQ's INT 28 handler
 0Eh    DWORD    original INT 28 handler
 12h    BYTE    2Fh
 13h    DWORD    FINDIRQ's INT 2F handler
 17h    DWORD    original INT 2F handler
--------N-2FF483-----------------------------
INT 2F - PowerLAN - ???
    AX = F483h
    ???
Return: ???
SeeAlso: AX=F400h"PowerLAN",AX=F401h"PowerLAN"
--------d-2FF700-----------------------------
INT 2F - AUTOPARK.COM - INSTALLATION CHECK
    AX = F700h
Return: AL = state
        00h not installed
        FFh installed
Program: AUTOPARK.COM is a resident hard disk parker by Alan D. Jones
--------d-2FF701-----------------------------
INT 2F - AUTOPARK.COM - SET PARKING DELAY
    AX = F701h
    BX:CX = 32-bit count of 55ms timer ticks
--------d-2FF800CX4455-----------------------
INT 2F U - SuperStor PRO 2XON.COM - INSTALLATION CHECK
    AX = F800h
    CX = 4455h ("DU")
    DL = 45h ("E")
Return: AL = FFh if installed
        ES:BX -> ASCII signature "Universal Data Exchange"
Program: SuperStor is a disk-compression program by Addstor.
Note:    returns AX=0001h if AL is not 00h or 01h
SeeAlso: AX=1001h,AX=F801h
--------d-2FF801CX4455-----------------------
INT 2F U - SuperStor PRO 2XON.COM - UNINSTALL
    AX = F801h
    CX = 4455h ("DU")
    DL = 45h ("E")
    ES:BX = return address if successful
Return: at specified address if successfully removed from memory
    else
        AL = error code
        ???
Program: SuperStor is a disk-compression program by Addstor.
Note:    returns AX=0001h if AL is not 00h or 01h
SeeAlso: AX=1001h,AX=F800h
----------2FFA00-----------------------------
INT 2F - Multiplex - ??? - INSTALLATION CHECK???
    AX = FA00h
    BX = ??? (0408h)
    CX = ??? (001Fh)
    DX = ??? (0102h)
    SI = ??? (5ACCh)
    DI = ??? (0632h)
Return: ???
Note:    called by WinEmacs at startup
----------2FFA00-----------------------------
INT 2F - Multiplex - ??? - INSTALLATION CHECK???
    AX = FA00h
    BX = ??? (03FCh)
    CX = ??? (003Fh)
    DX = ??? (00FFh)
    SI = ??? (5AA6h)
    DI = ??? (0620h)
Return: ???
Note:    called by Matlab at startup
--------*-2FFB-------------------------------
INT 2F - Multiplex - RESERVED BY BORLAND INTERNATIONAL
    AH = FBh
SeeAlso: AX=FB42h/BX=0001h
--------f-2FFB-------------------------------
INT 2F U - Conner Backup Exec AUTORES - API
    AH = FBh
    BL = function number (00h-07h)
    ???
Return: ???
Program: AUTORES is a resident program launcher for unattended backups
--------a-2FFB00-----------------------------
INT 2F U - AutoBraille v1.1A - INSTALLATION CHECK
    AX = FB00h
Return: AX = 00FFh if installed
Program: AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
SeeAlso: INT 10/AX=3800h,INT 14/AX=F0F1h
--------U-2FFB00-----------------------------
INT 2F U - Jot-It! v1.50 - INSTALLATION CHECK
    AX = FB00h
Return: AX = FFFFh if installed
        BX = version (BCD, BH=major, BL=minor)
SeeAlso: AX=FB03h"Jot-It",AX=FB01h"Jot-It"
--------a-2FFB01-----------------------------
INT 2F U - AutoBraille v1.1A - ???
    AX = FB01h
    ???
Return: ???
--------U-2FFB01-----------------------------
INT 2F U - Jot-It! v1.50 - GET USER NAME
    AX = FB01h
Return: DX:BX -> ASCIZ user name
SeeAlso: AX=FB02h"Jot-It"
--------a-2FFB02-----------------------------
INT 2F U - AutoBraille v1.1A - ???
    AX = FB02h
Return: AH = ???
    AL = ???
--------U-2FFB02-----------------------------
INT 2F U - Jot-It! v1.50 - GET MESSAGE DIRECTORY
    AX = FB02h
Return: DX:BX -> ASCIZ name of directory in which messages are stored
SeeAlso: AX=FB01h"Jot-It"
--------a-2FFB03-----------------------------
INT 2F U - AutoBraille v1.1A - GET NEXT ???
    AX = FB03h
Return: AX = ???
--------U-2FFB03-----------------------------
INT 2F U - Jot-It! v1.50 - UNINSTALL
    AX = FB03h
Return: resident code removed from memory
Note:    CAUTION: NO checks are performed to ensure that the interrupt vectors
      being unhooked (08h,09h,28h,2Fh) actually point at the Jot-It! code
SeeAlso: AX=FB00h"Jot-It"
--------a-2FFB-------------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AH = FBh
    AL = 04h-08h
Return: AX = 0000h
--------a-2FFB-------------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AH = FBh
    AL = 09h-0Fh (???, 0Eh = COM1, 0Fh = COM2)
Return: ???
Program: AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
--------a-2FFB-------------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AH = FBh
    AL = 10h-1Fh
    ???
Return: ???
--------a-2FFB20-----------------------------
INT 2F U - AutoBraille v1.1A - SET ??? FLAGS
    AX = FB20h
    BL = flags to set
SeeAlso: AX=FB21h"AutoBraille"
--------a-2FFB21-----------------------------
INT 2F U - AutoBraille v1.1A - CLEAR ??? FLAGS
    AX = FB21h
    BL = flags to clear
SeeAlso: AX=FB20h"AutoBraille"
--------a-2FFB22-----------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AX = FB22h
    BL = ???
Program: AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
--------a-2FFB28-----------------------------
INT 2F U - AutoBraille v1.1A - ???
    AX = FB28h
    BX = ???
    ???
Return: ???
SeeAlso: AX=FB29h"AutoBraille"
--------a-2FFB29-----------------------------
INT 2F U - AutoBraille v1.1A - ???
    AX = FB29h
    BX = ???
    ???
Return: ???
SeeAlso: AX=FB28h"AutoBraille"
--------a-2FFB-------------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AH = FBh
    AL = 2Bh-34h
    BX = ???
--------a-2FFB35-----------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AX = FB35h
    BL = ???
--------a-2FFB36-----------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AX = FB36h
    BL = ???
--------a-2FFB37-----------------------------
INT 2F U - AutoBraille v1.1A - SET ???
    AX = FB37h
    BL = ???
Program: AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
--------E-2FFB42BX0001-----------------------
INT 2F PU - Borland C++ DPMILOAD.EXE - INSTALLATION CHECK???
    AX = FB42h
    BX = 0001h
Return: AX = version number??? (AL=major, AH=minor)
    CX = next-selector increment
---BC2.0---
    ES:BX -> 80-byte buffer for ???
    DX = DPMI version
---BC3.0---
    BX = ??? (0000h)
    DX = ???
    ES:SI -> list of valid selectors ???
Notes:    The version of DPMILOAD distributed with BC++ v2.0 identifies itself
      as version 1.000, while the version distributed with BC++ 3.0
      identifies itself as version 1.0; the former is 10864 bytes, the
      latter 22180 bytes.  The BC2.0 version is a DPMI loader, while
      the BC3.0 version also adds a DPMI host and DOS extender
    the BC++ 2.0 version displays an error message if called with BX
      values other than 0001h-0008h
SeeAlso: AX=1687h,AX=FB42h/BX=1001h,AX=FB43h
--------E-2FFB42BX0002-----------------------
INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - ALLOCATE MEMORY
    AX = FB42h
    BX = 0002h
    CX = size in bytes
    DX = bit flags
        bit 2: set to allocate DOS memory, clear for DPMI memory
    SI = selector of descriptor to be modified to access allocated memory
    DI = selector of a second descriptor to be modified
Return: AX = ??? or 0000h on error
    CX:DX = linear base address of DPMI memory block
    SI:DI = handle for DPMI memory block or FFFFh:FFFFh
    ???
Note:    two segment descriptors may be set if a code and an aliased data
      segment are required; if only one descriptor is needed, SI should
      equal DI on entry
BUG:    when allocating DOS memory, the code computes the linear address by
      multiplying the segment number by 4 rather than shifting by 4
SeeAlso: AX=FB42h/BX=0003h,AX=FB42h/BX=0008h,INT 31/AX=0501h
--------E-2FFB42BX0002-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ALLOCATE MEMORY
    AX = FB42h
    BX = 0002h
    ES:SI -> memory block info (see #2383)
Return: ???
Note:    The version of DPMILOAD distributed with BC++ v2.0 identifies itself
      as version 1.000, while the version distributed with BC++ 3.0
      identifies itself as version 1.0; the former is 10864 bytes, the
      latter 22180 bytes.
SeeAlso: AX=FB42h/BX=0003h,AX=FB42h/BX=0008h,INT 31/AX=0501h

Format of DPMILOAD memory block info:
Offset    Size    Description    (Table 2383)
 00h    WORD    flags (see #2384)
 02h    DWORD    block size in bytes
---DPMI memory block---
 06h    DWORD    DPMI memory block handle
---DOS memory block---
 06h    WORD    real-mode segment of memory block
 08h    WORD    selector of memory block
---
 0Ah    DWORD    linear address of memory
 0Eh    WORD    memory operation error code
        0008h no more free LDT descriptors
---if flags bit 0 clear---
 10h    WORD    code segment selector for memory block or 0000h or FFFFh
 12h    WORD    data alias selector for memory block or 0000h or FFFFh
---if flags bit 0 set---
 10h    WORD    data segment selector for memory block or 0000h or FFFFh
 12h    WORD    unused???

Bitfields for DPMILOAD memory block flags:
Bit(s)    Description    (Table 2384)
 0    set if data segment rather than code segment
 1    information valid
 2    set if DOS memory block rather than DPMI memory block
 4    ???
 15    set if no LDT selectors for memory block???
SeeAlso: #2383
--------E-2FFB42BX0003-----------------------
INT 2F PU - Borland C++ DPMILOAD.EXE - GET AVAILABLE MEMORY
    AX = FB42h
    BX = 0003h
Return: DX:AX = size of largest free block in paragraphs
        0000h:0000h on error (BC3.0 version only)
Note:    AX and DX are destroyed on error, but no other error indicator is
      returned, under the BC++ 2.0 version of DPMILOAD
SeeAlso: AX=FB42h/BX=0002h
--------E-2FFB42BX0004-----------------------
INT 2F PU - Borland C++ DPMILOAD.EXE - LOAD PROTECTED-MODE EXECUTABLE???
    AX = FB42h
    BX = 0004h
    DS:DX -> ASCIZ filename of protected-mode executable
Return: CX = selector of ??? or 0000h
---BC3.0---
    DX = status (0000h,FFF4h,others???) (see #2385)
Note:    the filename may also be terminated by a CR rather than a NUL under the
      BC++ 3.0 version of DPMILOAD

(Table 2385)
Values for DPMILOAD function status:
 0000h    successful
 0001h    ??? failure
 0002h    invalid selector
 0004h    unknown error
 0008h    no more LDT descriptors available???
 FFDEh    unable to set descriptor
 FFDFh    unable to get segment base address
 FFE0h    ???
 FFF2h    invalid parameter value
 FFF4h    component of filename too long (name not in 8.3 format)
 FFF5h    pathname too long (>79 chars)
 FFF6h    ???
 FFF8h    ???
 FFF9h    index out of range
 FFFAh    ???
 FFFCh    invalid access to code segment???
 FFFEh    ???
 FFFFh    general error
--------E-2FFB42BX0005-----------------------
INT 2F PU - Borland C++ DPMILOAD.EXE - GET ADDRESS OF ??? BY NAME
    AX = FB42h
    BX = 0005h
    CX = selector of DPMILOAD data (see #2386)
    DS:DX -> ASCIZ or CR-terminated name of ??? (case ignored)
Return: DX = status (see #2385)
        0000h successful
        AX:BX -> ??? FAR function (called with two words on top of stk)
        else
        BX destroyed
SeeAlso: AX=FB42h/BX=0006h,AX=FB42h/BX=000Eh

Format of DPMILOAD data:
Offset    Size    Description    (Table 2386)
 00h 12 BYTEs    ???
 0Ch    WORD    ??? bit flags
 0Eh 14 BYTEs    ???
 1Ch    WORD    number of memory control records (see #2389)
 1Eh 25 BYTEs    ???
 37h    BYTE    ??? bit flags
        bit 4: data valid???
 38h  4 BYTEs    ???
 3Ch    WORD    ???
 3Eh 12 BYTEs    ???
 46h    BYTE    ??? counter
 47h    BYTE    ???
 48h    BYTE    ???
 49h    BYTE    ???
 4Ah    WORD    ???
 4Ch  2 BYTEs    ???
 4Eh    WORD    offset of array of 64-byte memory control records
 52h    WORD    offset of name list (see #2387)
 54h  4 BYTEs    ???
 58h    WORD    offset of array of 6-byte objects (see #2388)
 5Ah  8 BYTEs    ???
 62h  9 BYTEs    ASCIZ name for ???
 6Bh  9 BYTEs    ASCIZ name for ???
    ???

Format of name list entry [array]:
Offset    Size    Description    (Table 2387)
 00h    BYTE    length of name (00h if end of array)
 01h  N BYTEs    name
 N+1    WORD    1-based index into array of unknown 6-byte objects

Format of 6-byte objects:
Offset    Size    Description    (Table 2388)
 00h    BYTE    ???
 01h    BYTE    ???
 02h    BYTE    ???
 03h    BYTE    1-based index of memory control record
 04h    WORD    ???

Format of memory control record:
Offset    Size    Description    (Table 2389)
 00h 20 BYTEs    memory block info (see #2383)
 14h  6 BYTEs    ???
 1Ah    BYTE    ???
 1Bh  2 BYTEs    ???
 1Dh    BYTE    ??? bit flags
 1Eh 14 BYTEs    ???
 2Ch    DWORD    pointer to ??? memory control record or 0000h:0000h
 30h    DWORD    pointer to ??? memory control record or 0000h:0000h
 34h    DWORD    pointer to next??? memory control record or 0000h:0000h
 38h    DWORD    pointer to prev??? memory control record or 0000h:0000h
 3Ch  4 BYTEs    ???
Note:    the pointers at offsets 2Ch and 30h form a doubly-linked list, as do
      the pointers at offsets 34h and 38h
--------E-2FFB42BX0006-----------------------
INT 2F PU - Borland C++ DPMILOAD.EXE - GET ADDRESS OF ??? BY NUMBER
    AX = FB42h
    BX = 0006h
    CX = selector of DPMILOAD data (see #2386)
    DX = 1-based index into array of ??? 6-byte objects
Return: DX = status (see #2385)
        0000h successful
        AX:BX -> ??? FAR function (called with two words on top of stk)
        else
        BX destroyed
SeeAlso: AX=FB42h/BX=0005h,AX=FB42h/BX=000Eh
--------E-2FFB42BX0007-----------------------
INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0007h
    CX = selector of ???
Return: ???
Note:    The version of DPMILOAD distributed with BC++ v2.0 identifies itself
      as version 1.000, while the version distributed with BC++ 3.0
      identifies itself as version 1.0; the former is 10864 bytes, the
      latter 22180 bytes.
--------E-2FFB42BX0007-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0007h
    CX = selector of DPMILOAD data (see #2386)
    ???
Return: DX = status (see #2385)
        0000h successful
        AX = ???
--------E-2FFB42BX0008-----------------------
INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - FREE MEMORY BLOCK
    AX = FB42h
    BX = 0008h
    CX = bit flags
        bit 2: set if DPMI memory, clear if DOS memory
    DX = selector of DOS memory block
    SI:DI = handle of DPMI memory block
Return: DX = 0000h on error, unchanged if succcessful
Note:    The version of DPMILOAD distributed with BC++ v2.0 identifies itself
      as version 1.000, while the version distributed with BC++ 3.0
      identifies itself as version 1.0; the former is 10864 bytes, the
      latter 22180 bytes.
SeeAlso: AX=FB42h/BX=0002h
--------E-2FFB42BX0008-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - FREE MEMORY BLOCK
    AX = FB42h
    BX = 0008h
    ES:SI -> memory block info (see #2383)
Return: ???
SeeAlso: AX=FB42h/BX=0009h
--------E-2FFB42BX0009-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - RESIZE MEMORY BLOCK
    AX = FB42h
    BX = 0009h
    ES:SI -> memory block info (see #2383)
    ???
Return: ???
SeeAlso: AX=FB42h/BX=0008h"3.0"
--------E-2FFB42BX000A-----------------------
INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - INIT DPMI HOST AND SPAWN SUBSHELL
    AX = FB42h
    BX = 000Ah
    CX = 0001h
    DX = ???
    SI = ???
Return: after user exits subshell
Notes:    this call is used by DPMIRES; unlike most of the DPMILOAD calls, this
      function is not available in protected mode.
    the BC2.0 version of DPMILOAD is purely a DPMI loader, while the BC3.0
      version also adds a DPMI host and DOS extender.
SeeAlso: AX=FB42h/BX=0004h,AX=FB42h/BX=0015h
--------E-2FFB42BX000B-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - UNUSED
    AX = FB42h
    BX = 000Bh
--------E-2FFB42BX000C-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - FREE DESCRIPTORS FOR MEMORY BLOCK???
    AX = FB42h
    BX = 000Ch
    ES:SI -> memory block info ??? (see #2383)
Return: DX = status???
SeeAlso: AX=FB42h/BX=000Fh
--------E-2FFB42BX000D-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SIMULATE REAL MODE INTERRUPT
    AX = FB42h
    BX = 000Dh
    CX = number of words to copy from protected-mode to real mode stack
    DL = interrupt number
    DH = flags
        bit 0: reset the interrupt controller and A20 line
    ES:DI -> real-mode call structure (see #2403 at INT 31/AX=0300h)
Return: CX = status
        0000h successful
        0001h failed
SeeAlso: INT 31/AX=0300h
--------E-2FFB42BX000E-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ADDRESS OF ???
    AX = FB42h
    BX = 000Eh
    DS:DX -> ASCIZ or CR-terminated name of ???
Return: CX = selector of DPMILOAD data (see #2386) corresponding to name,
          0000h on error
SeeAlso: AX=FB42h/BX=0006h,AX=FB42h/BX=001Fh
--------E-2FFB42BX000F-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - REALLOCATE LDT DESCRPS TO MEMBLK???
    AX = FB42h
    BX = 000Fh
    ES:SI -> memory block info (see #2383)
Return: ???
SeeAlso: AX=FB42h/BX=000Ch
--------E-2FFB42BX0010-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - CONVERT SEGMENT TO SELECTOR
    AX = FB42h
    BX = 0010h
    DX = segment number
Return: CX = status (0000h,0008h) (see also AX=FB42h/BX=0004h)
        0000h successful
        DX = selector number for descriptor
        0008h failed
SeeAlso: AX=FB42h/BX=0023h
--------E-2FFB42BX0011-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0011h
    CX = selector of DPMILOAD data (see #2386)
    ???
Return: DX = status (0000h,0002h,FFFEh) (see also #2385)
        0000h successful
        AX:BX -> ??? name
        FFFEh ??? error
--------E-2FFB42BX0012-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0012h
    CX = selector for ???
Return: CX = selector for ???
--------E-2FFB42BX0013-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0013h
    CX = selector of DPMILOAD data (see #2386)
    DX = 1-based index of ???
Return: CX = status (0000h,0002h,FFF9h) (see also #2385)
        0000h successful
        BX = ??? or 0000h
        FFF9h ??? error
--------E-2FFB42BX0014-----------------------
INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - INSTALLATION CHECK
    AX = FB42h
    BX = 0014h
    CX = 0001h
Return: BX = 0000h if installed
Note:    unlike most of the DPMILOAD functions, this call is available only in
      real or V86 mode
SeeAlso: AX=FB42h/BX=0001h,AX=FB42h/BX=000Ah
--------E-2FFB42BX0015-----------------------
INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - UNINSTALL
    AX = FB42h
    BX = 0015h
    CX = 0001h
Return: ???
Note:    unlike most of the DPMILOAD functions, this call is available only in
      real or V86 mode
SeeAlso: AX=FB42h/BX=000Ah
--------E-2FFB42BX0016-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ???
    AX = FB42h
    BX = 0016h
    CX = selector of DPMILOAD data (see #2386)
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        CX = ???
--------E-2FFB42BX0017-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0017h
    CX = ???
    DX = ???
    ???
Return: DX = status (0000h,0001h) (see #2385)
--------E-2FFB42BX0018-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SET ???
    AX = FB42h
    BX = 0018h
    CX = ???
--------E-2FFB42BX0019-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0019h
    CX = selector for ???
    ???
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        CX = selector for ???
--------E-2FFB42BX001A-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 001Ah
    CX = selector for ???
    ???
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        0004h failed
    CX:BX -> ???
--------E-2FFB42BX001B-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 001Bh
    CX = selector of DPMILOAD data (see #2386)
    DX = offset of ???
Return: DX = status (0000h,0002h) (see also #2385)
        0000h successful
        BX = selector for ???
        CX = selector for ???
--------E-2FFB42BX001C-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 001Ch
    ES = selector for DPMILOAD data (see #2386)
    CX = 1-based index of ???
    DX = 1-based index of ???
Return: DX = status (0000h,0002h,FFF9h) (see #2385)
--------E-2FFB42BX001D-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ???
    AX = FB42h
    BX = 001Dh
Return: CX:DX = ???
--------E-2FFB42BX001E-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 001Eh
    CX = ???
    ???
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        FFF7h ??? error
    CX:BX -> ???
--------E-2FFB42BX001F-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ADDRESS OF ???
    AX = FB42h
    BX = 001Fh
    DS:DX -> 8-character name of ???
    ???
Return: CX = selector of DPMILOAD data (see #2386) for ???
        0000h on error
SeeAlso: AX=FB42h/BX=000Eh
--------E-2FFB42BX0020-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - NULL FUNCTION???
    AX = FB42h
    BX = 0020h
Return: DX = ??? (always 0000h)
--------E-2FFB42BX0021-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET PROCESSOR EXCEPTION HANDLER VECT
    AX = FB42h
    BX = 0021h
    CL = exception number (00h-1Fh)
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        AX:BX = selector:offset of handler
        FFF2h unable to get exception handler vector
SeeAlso: AX=FB42h/BX=0022h,AX=FB42h/BX=0024h,INT 31/AX=0202h
--------E-2FFB42BX0022-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SET PROCESSOR EXCEPTION HANDLER VECT
    AX = FB42h
    BX = 0022h
    CL = exception number (00h-1Fh)
    SI:DX = selector:offset of new handler
Return: DX = status (0000h,0004h,FFF2h) (see #2385)
SeeAlso: AX=FB42h/BX=0021h,AX=FB42h/BX=0025h,INT 31/AX=0203h
--------E-2FFB42BX0023-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - CONVERT SELECTOR TO SEGMENT NUMBER
    AX = FB42h
    BX = 0023h
    CX = selector
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        CX = real-mode segment number
        FFF2h descriptor has invalid base address for real-mode segment
SeeAlso: AX=FB42h/BX=0010h
--------E-2FFB42BX0024-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET PROTECTED-MODE INTERRUPT VECTOR
    AX = FB42h
    BX = 0024h
    CL = interrupt number
Return: DX = status (0000h) (see also AX=FB42h/BX=0004h)
    AX:BX = selector:offset of handler
SeeAlso: AX=FB42h/BX=0025h,INT 31/AX=0204h
--------E-2FFB42BX0025-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SET PROTECTED-MODE INTERRUPT VECTOR
    AX = FB42h
    BX = 0025h
    CL = interrupt number
    SI:DX = selector:offset of new handler
Return: DX = status (0000h,0004h,FFF2h) (see #2385)
SeeAlso: AX=FB42h/BX=0024h,INT 31/AX=0205h
--------E-2FFB42BX0026-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
    AX = FB42h
    BX = 0026h
    CX = selector of DPMILOAD data (see #2386)
    DX = 1-based index of ???
    ???
Return: DX = status (0000h,0002h,FFF9h) (see #2385)
        0000h successful
        BX = offset of ??? within data structure
--------E-2FFB42BX0027-----------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ???
    AX = FB42h
    BX = 0027h
    CX = selector of DPMILOAD data (see #2386)
    DX = offset of ???
Return: DX = status (see also AX=FB42h/BX=0004h)
        0000h successful
        BX = ???
--------E-2FFB42BX0080-----------------------
INT 2F U - ??? - CALLED BY Borland C++ 3.0 DPMILOAD.EXE
    AX = FB42h
    BX = 0080h
    ???
Return: AX = ???
    ???
--------E-2FFB42BX0081-----------------------
INT 2F U - ??? - CALLED BY Borland C++ 3.0 DPMILOAD.EXE
    AX = FB42h
    BX = 0081h
    ???
Return: AX = ???
    ???
--------E-2FFB42BX1001-----------------------
INT 2F U - Borland RTM.EXE 1.0 - INSTALLATION CHECK???
    AX = FB42h
    BX = 1001h
Return: BX = 0000h
SeeAlso: AX=FB42h/BX=0001h,AX=FB42h/BX=1002h,AX=FB42h/BX=1003h
--------E-2FFB42BX1002-----------------------
INT 2F U - Borland RTM.EXE 1.0 - ???
    AX = FB42h
    BX = 1002h
    ???
Return: ???
SeeAlso: AX=FB42h/BX=1001h
--------E-2FFB42BX1003-----------------------
INT 2F U - Borland RTM.EXE 1.0 - ???
    AX = FB42h
    BX = 1003h
    ???
Return: ???
SeeAlso: AX=FB42h/BX=1001h
--------E-2FFB43-----------------------------
INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - NULL FUNCTION
    AX = FB43h
    BX = subfunction (at least 0000h-000Eh)
Notes:    this function is only present in protected mode; it does nothing but
      an immediate IRET
    DPMILOAD.EXE itself calls various subfunctions:
        subfunction 0004h is called with CX=selector of ???, DI=selector
          of DPMILOAD data
        subfunction 0008h is called with CX=selector of DPMILOAD data
SeeAlso: AX=FB42h/BX=0001h
--------G-2FFB43BX0100-----------------------
INT 2F PU - Borland TDX - INSTALLATION CHECK
    AX = FB43h
    BX = 0100h
Return: BX = FB43h if loaded
Program: TDX is Borland's Turbo Debugger variant for DPMI programs
Note:    Borland Pascal 7 DPMI programs use this call to check whether they
      should install their own stack and general protection exception
      handlers, or allow TDX to handle those exceptions
--------a-2FFB64-----------------------------
INT 2F U - AutoBraille v1.1A - GET ???
    AX = FB64h
Return: AX = ??? (0006h seen)
Program: AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
--------E-2FFBA1BX0081-----------------------
INT 2F U - TKERNEL (Borland DOS extender) - INSTALLATION CHECK
    AX = FBA1h
    BX = 0081h
    ES:DI -> 16-byte buffer
Return: if installed, first four bytes of ES:DI buffer are "IABH"
Program: TKERNEL is a licensed version of AI Architects/Ergo's OS/x86.
Note:    TKERNEL was present only in Borland C++ 2.0; with version 3.0, the DOS
      extender was moved into DPMILOAD.
SeeAlso: AH=A1h,AX=F100h,AX=FBA1h/BX=0082h,AX=FBA1h/BX=0084h,INT 15/AX=BF02h
SeeAlso: INT 21/AX=4403h"AI Architects"
--------E-2FFBA1BX0082-----------------------
INT 2F U - TKERNEL (Borland DOS extender) - GET ENTRY POINT
    AX = FBA1h
    BX = 0082h
    ES:DI -> response buffer (see #2390)
Return: ES:DI buffer filled
SeeAlso: AX=FBA1h/BX=0081h,AX=FBA1h/BX=0084h

Format of TKERNEL response buffer:
Offset    Size    Description    (Table 2390)
 00h  4 BYTEs    signature "IABH"
 04h    DWORD    pointer to FAR extender entry point (see #2391)

(Table 2391)
Call TKERNEL entry point with:
    AX = function number
        0000h initialize???
        STACK:    WORD  ???
        Return: AX = status???
            STACK unchanged
        0001h get version???
        Return: AX = 0200h for v2.0.34
        0002h get ???
        Return: AX = ??? (011Eh or 0182h seen)
        0003h load protected-mode executable
        STACK:    DWORD -> ASCIZ filename of executable
            DWORD    ???
            DWORD -> program arguments (counted string plus CR)
            DWORD -> environment for protected-mode executable
                (terminated with two consecutive NULs)
            DWORD -> WORD buffer for ???
        Return: AX = status???
            STACK unchanged
        0004h get descriptor
        STACK:    WORD    selector for which to get descriptor
            WORD    segment number (when running in real mode)
            DWORD -> buffer for descriptor
        Return: CF clear if successful
                buffer filled
            CF set on error
                AX destroyed???
            STACK unchanged
        0005h ???
        STACK:    WORD    selector for ???
            WORD    subfunction number???
                0000h run previously-loaded program???
                0001h ??? (similar to 0000h)
                0002h
                0003h
                0005h ??? (similar to 0000h and 0001h)
        Return: AX = status???
            STACK unchanged
        0006h ???
        STACK:    WORD ???
            DWORD -> WORD (call) max iterations of ???
                      (ret) remaining iterations
        Return: AX = ???
            STACK unchanged
        0007h unused
        Return: AX = 0001h
        0008h unused
        Return: AX = 0001h
        0009h copy protected-mode memory into conventional memory
        STACK:    WORD    selector for source segment
            WORD    segment of source if in real mode???
            DWORD    offset of source
            WORD    number of bytes to copy
            DWORD -> low-memory destination
        Return: AX = status
            STACK unchanged
        000Ah copy conventional memory into protected-mode memory
        STACK:    WORD    selector for destination segment
            WORD    segment of destination if in real mode???
            DWORD    offset of destination
            WORD    number of bytes to copy
            DWORD -> low-memory source
        Return: AX = status
            STACK unchanged
        000Bh get ??? pointers
        STACK:    WORD desired pointer
                0000h get ???
                0002h get protected-mode CR3
                0003h get 4K page table buffer pointer
                else Return: DX:AX = FFFFh:FFFFh
        Return: DX:AX = requested pointer
            STACK unchanged
        000Ch set ??? pointers
        STACK:    WORD desired pointer
                0000h set ???
                0002h set protected-mode CR3
                0003h set 4K page table buffer pointer
                else ignore
            DWORD new value for pointer
        Return: STACK unchanged
        000Dh get ??? pointers
        STACK:    WORD desired pointer
                0000h get ???
                0001h get ???
                0002h get ???
                0003h get ???
                0004h get ???
                0005h get ???
                0006h get ???
                0007h get ???
                else Return: DX:AX = FFFFh:FFFFh
        Return: DX:AX = desired pointer
            STACK unchanged
        000Eh set ??? pointer
        STACK:    WORD desired pointer
                0000h set ???
                0001h set ???
                0002h set ???
                0003h set ???
                0004h set ???
                0005h set ???
                0006h set ???
                0007h set ???
                else Return: DX:AX = FFFFh:FFFFh
        Return: STACK unchanged
        000Fh get ???
        Return: AX = ??? (seen 0008h)
        0010h get ???
        Return: AX = ???
        0011h determine whether selector is valid
        STACK:    WORD    possible selector
        Return: AX = selector or 0000h if invalid
            STACK unchanged
        0012h get physical address
        STACK:    WORD    selector for desired segment
            WORD    segment number if in real mode
            DWORD    offset within segment
        Return: DX:AX = 32-bit physical address or 00000000h on error
            BX destroyed
            STACK unchanged
        0013h ???
        Note:    normally jumps to code for function 0012h
        0014h copy protected-mode memory to conventional memory, with ???
        STACK:    WORD    selector for source segment
            WORD    segment of source if in real mode???
            DWORD    offset of source
            WORD    number of bytes to copy
            DWORD -> low-memory destination
        Return: AX = status???
            STACK unchanged
        0015h copy conventional memory to protected-mode memory, with ???
        STACK:    WORD    selector for destination segment
            WORD    segment of destination if in real mode???
            DWORD    offset of destination
            WORD    number of bytes to copy
            DWORD -> low-memory source
        Return: AX = status???
            STACK unchanged
        0016h set ??? pointer
        STACK:    WORD    unused
            DWORD -> ??? or 0000h:0000h
        Return: AX = 0000h
            STACK unchanged
        0017h allocate real-mode procedure???
        STACK:    DWORD    ASCIZ name of procedure
            DWORD ???
            DWORD    address of subroutine to invoke
        Return: AX = status
                0032h procedure by that name exists
                0033h no more real-mode procedures available
            DX destroyed
            STACK unchanged
        0018h unused
        Return: AX = 0001h
        0019h get parameter block
        Return: DX:AX -> parameter block (format unknown at this time,
                  but 92h bytes)
                  (preceded by signature "!!PARAM-BLOCK!!")
        001Ah get ???
        Return: AX = ??? (0148h seen)
        001Bh free real-mode procedure???
        STACK:    DWORD -> ASCIZ name of procedure
        Return: ???
            STACK unchanged
        001Ch check whether packets from protected mode task pending
        Return: AX = 0001h if packets pending, 0000h if not
        001Dh set ???
        STACK:    DWORD ??? or 0000h:0000h
        Return: AX,BX destroyed
            STACK unchanged
        001Eh ???
        STACK:    WORD ??? (high byte ignored)
            DWORD -> data structure (below)
        Return: AX,BX,CX,DX destroyed
            data structure updated
            STACK unchanged
        Format of data structure:
        Offset    Size    Description
         00h  2 BYTEs    unused
         02h    WORD    ???
         04h    WORD    ???
         06h    WORD    ???
         08h  2 BYTEs    unused
         0Ah    WORD    ???
         0Ch    WORD    (call) ???
                (ret) offset of this data structure (BUG?)
        001Fh set ???
        STACK:    WORD ??? (set to 0001h if zero)
        Return: AX destroyed
            STACK unchanged
        0020h ???
        STACK:    DWORD -> ??? (8 bytes of data)
        Return: AX = ???
            STACK unchanged
        0021h ???
        STACK:    DWORD -> ??? (8 bytes of data)
            WORD    ???
            WORD    ???
        Return: AX = ???
            STACK unchanged
        0022h ???
        STACK:    DWORD -> ??? (8 bytes of data)
            DWORD -> 4-byte buffer for results
        Return: AX = ???
            STACK unchanged
        0023h ???
        STACK:    DWORD -> ??? (8 bytes of data)
        Return: AX = ???
            STACK unchanged
        0024h set ???
        STACK:    WORD ???
        Return: AX destroyed
            STACK unchanged
        0025h get ???
        Return: AX = ??? (value set with func 0024h)
        0026h BUG: jumps to hyperspace due to fencepost error
        FFFFh set DOS memory management functions
        BX:SI -> FAR routine for allocating DOS memory
              (called with AH=48h,BX=number of paragraphs to alloc;
              returns CF clear, AX=segment of allocated memory, or
                  CF set on error)
        CX:DI -> FAR routine for freeing DOS memory
              (called with AH=49h,ES=segment of block to free;
              returns CF set on error, AX=error code)
        Note: each of these pointers normally points at INT 21/RETF
        other Return: AX = 0001h
Note:    BX may be destroyed by any of the API calls
--------E-2FFBA1BX0084-----------------------
INT 2F U - TKERNEL (Borland DOS extender) - UNINSTALL
    AX = FBA1h
    BX = 0084h
    ES:DI -> response buffer (see #2392)
Return: ES:DI buffer filled
SeeAlso: AX=FBA1h/BX=0081h,AX=FBA1h/BX=0084h

Format of TKERNEL response buffer:
Offset    Size    Description    (Table 2392)
 00h  4 BYTEs    signature "IABH"
 04h    WORD    success indicator
        0001h failed (INT 2F hooked by another program)
        unchanged if successful
 06h    WORD    segment of ???
 08h    WORD    segment of ??? memory block to free if nonzero
 0Ah    WORD    segment of ??? memory block to free if nonzero
--------s-2FFBFBES0000-----------------------
INT 2F U - SoundBlaster speech driver - INSTALLATION CHECK
    AX = FBFBh
    ES = 0000h
Return: ES nonzero if installed
        ES:BX -> entry point data structure (see #2393)
SeeAlso: INT 80/BX=0000h,INT F3"SoundBlaster"

Format of SoundBlaster entry point data structure:
Offset    Size    Description    (Table 2393)
 00h  3 BYTEs    signature "FB "
 03h    BYTE    driver major version number???
 04h    DWORD    speech driver entry point (see #2394)
 08h 24 BYTEs    ???
 20h  ? BYTEs    data buffer for calling speech driver
          (can be 117 bytes or more)

(Table 2394)
Call SoundBlaster speech driver entry point with:
    AL = function
        07h speak a string
        data buffer (see #2393) contains:
            BYTE  length of string
              N BYTEs string to speak
--------K-2FFD12-----------------------------
INT 2F - KS/KEYSTKCT.EXE - INSTALLATION CHECK
    AX = FD12h
Return: AX = 0093h if installed
        ES = resident code segment
        ES:CX -> internal "putbuf" routine
Program: KS/KEYSTKCT.EXE is a key stacking utility (4DOS KEYSTACK.SYS
      look-alike) by Martin Gerdes, published in c't 11/1991, which can be
      loaded as a device driver or as a TSR. It does not emulate 4DOS
      KSTACK API
Note:    the default buffer size is 128 keys
--------N-2FFE00BX4454-----------------------
INT 2F - PC-NFS ??? - INSTALLATION CHECK
    AX = FE00h
    BX = 4454h ("DT")
    CX = 4B52h ("KR")
    DX = 4E4Dh ("NM")
Return: AL = FFh if installed
       BX = 524Eh ("RM")
       CX = 4D44h ("MD")
       DX = 544Bh ("TK")
Note:    DV/X 1.10 DVPCNFS.DVR searches AH=FEh,FFh,C0h-FDh for a valid response
SeeAlso: AX=FE08h
--------N-2FFE00BX4454-----------------------
INT 2F - PC-NFS ??? - INSTALLATION CHECK
    AX = FE00h
    BX = 4454h ("DT")
    CX = 4B52h ("KR")
    DX = 544Dh ("TM")
Return: AL = FFh if installed
       BX = 5254h ("RT")
       CX = 4D44h ("MD")
       DX = 544Bh ("TK")
Note:    DV/X 1.10 DVPCNFS.DVR searches AH=FEh,FFh,C0h-FDh for a valid response
SeeAlso: AX=FE08h
--------U-2FFE00DI4E55-----------------------
INT 2F U - NORTON UTILITIES 5.0+ TSRs - INSTALLATION CHECK/STATUS REPORT
    AX = FE00h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply
        lowercase version of SI on entry (i.e. SI OR 2020h)
    AH = status
        00h installed but disabled internally
        01h installed and enabled
    AL = installed product
        00h NCACHE-x or DISKREET
        01h SPEEDRV / FILESAVE / EP / DISKMON v6+ installed
        02h NCACHE2 / SMARTCAN
        45h DISKMON v5 installed
    BX = length of *.INI file (DISKMON and FILESAVE/EP/SMARTCAN only)
          (see #2396,#2397)
    CX = segment of resident portion
        FFFFh if completely loaded high (NCACHE)
---FILESAVE/EP---
    DL = ??? (apparently always 00h)
---DISKMON---
    DX = ??? (apparently always 1AE6h [v5] / 1B86h [v6] / 1C26h [v7])
Notes:    the value returned in CX is incorrect for NCACHE 6.00
    all Norton Caches install as SMARTAAR drivers like SMARTDRV v3
    NCACHE2 and SPEEDRV both support the SMARTDRV v4+ installation check
    to detect Diskreet NDisk drives use CDS/DPB (see INT 21/AH=52h)
SeeAlso: AX=4A10h/BX=0000h,AX=FE01h,AX=FE02h,AX=FE03h,AX=FE04h,AX=FE05h
SeeAlso: INT 21/AX=4402h"SMARTDRV"

(Table 2395)
Values for Norton Utilities TSR identifier:
 4346h    ("CF") NCACHE-F (v5) / NCACHE (v6) / NCACHE2 (v7+) / SPEEDRV
 4353h    ("CS") NCACHE-S (v5 only)
 4443h    ("DC") DISKREET
 444Dh    ("DM") DISKMON
 4653h    ("FS") FILESAVE (v5) / EP (v6) / SMARTCAN (v7+)

Format of DISKMON.INI file:
Offset    Size    Description    (Table 2396)
-6Ch 108 BYTEs    (in memory copy only)
        list of filenames which are always protected:
          IBMBIO.COM/IBMDOS.COM, IO.SYS/MSDOS.SYS, TBIOS.SYS/TDOS.SYS,
          MIO.SYS/IO.BIN, COMMAND.COM
 00h    BYTE    ??? always 01h
 01h    BYTE    disk light (00h off, 01h on)
 02h    BYTE    disk protection (00h off, 01h on)
 03h    BYTE    protected areas
        01h system area
        02h files
        03h system area and files
        04h entire disk
 04h    BYTE    floppy access (00h not allowed, 01h allowed)
 05h 27 BYTEs    filename extension list (9 entries)
        (lowercase, blank padded or = 000000h)
 20h 240 BYTEs    filename list (20 entries)
        (lowercase, name and extension blank padded, with '.')
Note:    CX:0508h -> copy in installed TSR (v5)
    CX:052Fh -> copy in installed TSR (v6)
    CX:04E0h -> copy in installed TSR (v7-v8)

Format of FILESAVE.INI / EP.INI / SMARTCAN.INI file:
Offset    Size    Description    (Table 2397)
 00h 26 BITs    drive list (bit set: file protection on, cleared: off):
 00h    BYTE    drives    A: - H:
 01h    BYTE    drives    I: - P:
 02h    BYTE    drives    Q: - X:
 03h    BYTE    drives    Y: - Z:
 04h    BYTE    which files to protect
        00h all files
        01h all files with extension in list
        02h all files except those with extension in list
 05h 27 BYTEs    filename extension list (9 entries, uppercase, ASCIZ)
 20h    BYTE    include files with archive bit clear (00h no, 01h yes)
 21h    WORD    number of days after which files are purged (0 = never)
 23h    WORD    max kilobytes of erased file space to hold (0 = all)
Note:    CX:03D2h -> copy in installed TSR (v5)
    CX:03F5h -> copy in installed TSR (v6)
    CX:0434h -> copy in installed TSR (v7-v8)
--------U-2FFE00DX474F-----------------------
INT 2F - GO! v3.22+ - API
    AX = FE00h
    DX = 474Fh ('GO')
    SI = function number
        0063h (BCD for '?') installation check
        0078h (BCD for 'N') non-registered search (two levels only)
        0082h (BCD for 'R') reserved for registered version
        0083h (BCD for 'S') reserved for registered version
        0085h (BCD for 'U') uninstall
    BX:CX -> buffer (for search functions)
        buffer filled with search spec, i.e. "APL" to get first
          directory containing the substring APL, ":\APL" to find
          the first top-level directory beginning with the letters
          APL
Return: BX:CX buffer filled with result (search functions only)
        result is counted ASCIZ directory name, empty string if
        no matches (i.e. first byte is length of name, followed by
        name)
Program: GO! is a shareware directory locator TSR by Steve Ryckman
Note:    the application-supplied buffer for the requests and results which
      BX:CX points at must lie outside the conventional (low-640K)
      memory, since the TSR swaps memory on pop-up; a common location is
      the last 96 bytes of the video memory or a UMB
--------U-2FFE01DI4E55-----------------------
INT 2F U - NORTON UTILITIES 5.0+ TSRs - ENABLE
    AX = FE01h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h)
    AX = status
        0002h successful (DISKMON, FILESAVE, EP)
        FE00h successful (NCACHE-x, DISKREET)
Notes:    if the enable/disable calls are used on DISKMON or NCACHE-x, the status
      report generated by the programs still indicates the previous state,
      and DISKMON.INI is not updated
    apparently has no effect on DISKREET
SeeAlso: AX=FE00h,AX=FE02h
--------U-2FFE02DI4E55-----------------------
INT 2F U - NORTON UTILITIES 5.0+ TSRs - DISABLE
    AX = FE02h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h)
    AX = status
        0004h successful (DISKMON, FILESAVE)
        FE00h successful (NCACHE-x, DISKREET)
Notes:    (see also AX=FE01h)
    this function appears to be unsafe, as the cache buffers are not
      flushed
SeeAlso: AX=FE00h,AX=FE01h
--------U-2FFE03DI4E55-----------------------
INT 2F U - NORTON UTILITIES 5.0+ TSRs - FLUSH BUFFERS
    AX = FE03h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h)
    AX = status
        0006h successful???
Notes:    only supported by DISKMON, FILESAVE, and NCACHE-x
    useful for flushing NCACHE before rebooting
SeeAlso: AX=FE00h,AX=FE10h
--------U-2FFE04DI4E55-----------------------
INT 2F U - NORTON UTILITIES 5.0+ DISKMON, FILESAVE / EP - internal - ???
    AX = FE04h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI or 2020h)
    AX = status
        0008h successful???
SeeAlso: AX=FE00h
--------U-2FFE05DI4E55-----------------------
INT 2F U - NORTON UTILITIES 5.0+ DISKMON, FILESAVE / EP - internal - ???
    AX = FE05h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI or 2020h)
    AX = status
        000Ah successful???
Note:    reportedly dangerous
SeeAlso: AX=FE00h
--------N-2FFE08-----------------------------
INT 2F - PC-NFS ??? - GET ???
    AX = FE08h
Return: ES:BX -> ???
Notes:    DV/X 1.10 DVPCNFS.DVR searches AH=FEh,FFh,C0h-FDh for a valid response
    both the driver responding to AX=FE00h/DX=4E4Dh and the one responding
      to AX=FE00h/DX=544Dh support this function
SeeAlso: AX=FE00h/BX=4454h
--------U-2FFE10DI4E55-----------------------
INT 2F U - NORTON UTILITIES 6.0 NCACHE - REBOOT
    AX = FE10h
    DI = 4E55h ("NU")
    SI = TSR identifier (see #2395)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI or 2020h)
    AX = status
Note:    probably used to flush NCACHE buffers and reboot when Ctrl-Alt-Del is
      detected
SeeAlso: AX=FE03h
--------S-2FFEEF-----------------------------
INT 2F - RTS Control TSR - INSTALLATION CHECK
    AX = FEEFh
Return: AX = EFFEh if installed
        BX = port address
Program: RTS Control TSR is a utility by Michal Szokolo to lower the RTS
      signal on a COM port during disk accesses to avoid losing incoming
      data
--------N-2FFF00-----------------------------
INT 2F - Topware Network Operating System - INSTALLATION CHECK
    AX = FF00h
Return: AL = status
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
SeeAlso: AX=FF01h,AX=FF02h,AX=FF10h,INT 21/AX=FF00h"Topware",INT 7A"Topware"
--------N-2FFF01-----------------------------
INT 2F - Topware Network Operating System - GET VERSION
    AX = FF01h
Return: AX = version
SeeAlso: AX=FF00h,AX=FF02h
--------N-2FFF02-----------------------------
INT 2F - TopWare Network OS v5.10+ - GET TopNet VERSION STRING
    AX = FF02h
Return: ES:BX -> version string
SeeAlso: AX=FF00h,AX=FF01h
--------N-2FFF10-----------------------------
INT 2F - TopWare Network OS v5.10+ - TopTerm - INSTALLATION CHECK
    AX = FF10h
Return: AL = status (00h not installed, 01h installed)
SeeAlso: AX=FF00h,AX=FF11h,AX=FF12h,AX=FF13h
--------N-2FFF11-----------------------------
INT 2F - TopWare Network OS v5.10+ - TopTerm - ENABLE KEYBOARD SERVICE
    AX = FF11h
Note:    this function is only available on workstations, not on the server
SeeAlso: AX=FF10h,AX=FF12h
--------N-2FFF12-----------------------------
INT 2F - TopWare Network OS v5.10+ - TopTerm - DISABLE KEYBOARD SERVICE
    AX = FF12h
Note:    this function is only available on workstations, not on the server
SeeAlso: AX=FF10h,AX=FF11h
--------N-2FFF13-----------------------------
INT 2F - TopWare Network OS v5.10+ - TopTerm - SET INSTALLATION FLAG
    AX = FF13h
    CL = new state (00h off, 01h on)
SeeAlso: AX=FF10h
--------N-2FFF14-----------------------------
INT 2F - TopWare Network OS v5.10+ - START BACKGROUND RECEIVE VIDEO DATA
    AX = FF14h
Note:    this function is only available on workstations, not on the server
SeeAlso: AX=FF10h,AX=FF15h
--------N-2FFF15-----------------------------
INT 2F - TopWare Network OS v5.10+ - END BACKGROUND RECEIVE VIDEO DATA
    AX = FF15h
Note:    this function is only available on workstations, not on the server
SeeAlso: AX=FF10h,AX=FF14h
--------N-2FFF16-----------------------------
INT 2F - TopWare Network OS v5.10+ - SET CONTROL NUMBER OF "SHOW" SCREEN
    AX = FF16h
    BL = which to set (00h TopShow, FFh TopTerm)
    CX = destination screen
        0000h all stations
        0000h-00FFh (TopTerm only) send to group CL
        8001h-80FEh send to station CL
SeeAlso: AX=FF18h
--------N-2FFF18-----------------------------
INT 2F - TopWare Network OS v5.10+ - SEND FULL SCREEN OF DATA FOR TopShow
    AX = FF18h
SeeAlso: AX=FF00h,AX=FF16h,AX=FF27h
--------N-2FFF23-----------------------------
INT 2F - TopWare Network OS v5.10+ - CLOSE SPOOL FILES AND START PRINTING
    AX = FF23h
SeeAlso: AX=FF00h
--------N-2FFF27-----------------------------
INT 2F - TopWare Network OS v5.10+ - GET "SHOW" TYPE
    AX = FF27h
Return: AL = type (00h complete version, 01h simple version)
    BL = "show" functions flag (00h disabled, 01h enabled)
SeeAlso: AX=FF16h,AX=FF18h
--------D-30---------------------------------
INT 30 - (NOT A VECTOR!) - DOS 1+ - FAR JMP instruction for CP/M-style calls
   the CALL 5 entry point does a FAR jump to here
Note:    under DOS 2+, the instruction at PSP:0005 points two bytes too low in
      memory
SeeAlso: INT 21/AH=26h
--------V-30---------------------------------
INT 30 - QRIP/TSR - USED BY GRAPHICS LIBRARY
Program: QRIP/TSR is a shareware TSR by Shane Hathaway implementing the Remote
      Imaging Protocol (RIP, RIPscrip) used by several BBS systems to
      provide a graphical user interface
SeeAlso: INT 2F/AX=ACF0h
--------W-30---------------------------------
INT 30 P - MS Windows 3.1+ - PROTECTED-MODE CALLBACK
SeeAlso: INT 20"Windows"
--------D-31---------------------------------
INT 31 - overwritten by CP/M jump instruction in INT 30
--------v-31---------------------------------
INT 31 - VIRUS - "Vacsina" series - INSTALLATION CHECK (NOT A VECTOR!)
Note:    if one of the Vacsina viruses is resident, the low byte of this
      interrupt still contains the last byte of the INT 30 CP/M JMP
      instruction, but the remaining three bytes are 7Fh 39h followed
      by the Vacsina version number
SeeAlso: INT 21/AX=FFFFh"VIRUS",INT 32"VIRUS"
--------E-310000-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE LDT DESCRIPTORS
    AX = 0000h
    CX = number of descriptors to allocate
Return: CF clear if successful
        AX = base selector
    CF set on error
        AX = error code (DPMI 1.0+) (see #2398)
Notes:    DPMI is the DOS Protected-Mode Interface
    the base and limit of the returned descriptors will be 0, and the type
      will be "data"
    add the value returned by INT 31/AX=0003h to move to subsequent
      descriptors if multiple descriptors were allocated
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0001h,AX=000Dh,INT 21/AX=3501h

(Table 2398)
Values for DPMI 1.0 error code:
 0000h-7FFFh DOS error passed through by DPMI
 8001h    unsupported function
 8002h    object in wrong state for function
 8003h    system integrity would be endangered
 8004h    deadlock detected
 8005h    pending serialization request cancelled
 8010h    out of DPMI internal resources
 8011h    descriptor unavailable
 8012h    linear memory unavailable
 8013h    physical memory unavailable
 8014h    backing store unavailable
 8015h    callback unavailable
 8016h    handle unavailable
 8017h    maximum lock count exceeded
 8018h    shared memory already serialized exclusively by another
 8019h    shared memory already serialized shared by another client
 8021h    invalid value for numeric or flag parameter
 8022h    invalid segment selector
 8023h    invalid handle
 8024h    invalid callback
 8025h    invalid linear address
 8026h    request not supported by hardware
--------E-310001-----------------------------
INT 31 P - DPMI 0.9+ - FREE LDT DESCRIPTOR
    AX = 0001h
    BX = selector to free
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #2398)
Notes:    only one descriptor is freed per call
    the program's initial CS, DS, and SS descriptors may be freed
    (DPMI 1.0+) any segment registers containing the freed selector are
      set to 0000h
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0000h,AX=000Ah,AX=000Dh,INT 21/AX=3502h
--------E-310002-----------------------------
INT 31 P - DPMI 0.9+ - SEGMENT TO DESCRIPTOR
    AX = 0002h
    BX = real mode segment
Return: CF clear if successful
        AX = selector corresponding to real mode segment (64K limit)
    CF set on error
        AX = error code (DPMI 1.0+) (8011h) (see #2398)
Notes:    multiple calls for the same real mode segment return the same selector
    the returned descriptor can never be modified or freed
    not supported by MS Windows 3.0 in Standard mode
--------E-310003-----------------------------
INT 31 P - DPMI 0.9+ - GET NEXT SELECTOR INCREMENT VALUE
    AX = 0003h
Return: CF clear
        AX = value to add to get next sequential selector
Notes:    the increment will be a power of two
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0000h
--------E-310004-----------------------------
INT 31 P - DPMI 0.9+ - LOCK SELECTOR
    AX = 0004h
    BX = selector to lock (prevent paging)
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0005h,AX=0600h
--------E-310005-----------------------------
INT 31 P - DPMI 0.9+ - UNLOCK SELECTOR
    AX = 0005h
    BX = selector to unlock (permit paging)
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0004h,AX=0601h
--------E-310006-----------------------------
INT 31 P - DPMI 0.9+ - GET SEGMENT BASE ADDRESS
    AX = 0006h
    BX = selector
Return: CF clear if successful
        CX:DX = linear base address of segment
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #2398)
Note:    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,INT 21/AX=3504h
--------E-310007-----------------------------
INT 31 P - DPMI 0.9+ - SET SEGMENT BASE ADDRESS
    AX = 0007h
    BX = selector
    CX:DX = linear base address
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8022h,8025h) (see #2398)
Notes:    only modify descriptors allocated with INT 31/AX=0000h
    only the low 24 bits of the address will be used by 16-bit DPMI
      implementations even on a 386 or higher
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0006h,AX=0008h,AX=0009h,AX=000Ch,INT 21/AX=3503h
SeeAlso: INT 21/AH=E9h"OS/286",INT 2C/AX=0002h
--------E-310008-----------------------------
INT 31 P - DPMI 0.9+ - SET SEGMENT LIMIT
    AX = 0008h
    BX = selector
    CX:DX = segment limit
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see #2398)
Notes:    CX must be zero for 16-bit DPMI implementations
    limits greater than 1MB must be page aligned (low 12 bits set)
    only modify descriptors allocated with INT 31/AX=0000h
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,AX=0009h,AX=000Ch,INT 21/AX=3505h,INT 21/AH=E9h"OS/286"
SeeAlso: INT 2C/AX=0003h,#0405 at INT 15/AH=89h
--------E-310009-----------------------------
INT 31 P - DPMI 0.9+ - SET DESCRIPTOR ACCESS RIGHTS
    AX = 0009h
    BX = selector
    CL = access rights/type byte (see #0406 at INT 15/AH=89h)
    CH = 80386 extended rights/type byte (see #0407 at INT 15/AH=89h)
        (32-bit DPMI implementations only)
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see #2398)
Notes:    if the Present bit is clear, CL bits 0-3 may have any value
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,AX=0008h,AX=000Ch,INT 21/AX=2514h,INT 2C/AX=0004h
SeeAlso: INT 2C/AX=0005h
--------E-31000A-----------------------------
INT 31 P - DPMI 0.9+ - CREATE ALIAS DESCRIPTOR
    AX = 000Ah
    BX = selector
Return: CF clear if successful
        AX = new data selector
    CF set on error
        AX = error code (DPMI 1.0+) (8011h,8022h) (see #2398)
Notes:    fails if selector in BX is not a code segment or is invalid
    use INT 31/AX=0001h to free new selector
    future changes to the original selector will not be reflected in the
      returned alias selector
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0001h
--------E-31000B-----------------------------
INT 31 P - DPMI 0.9+ - GET DESCRIPTOR
    AX = 000Bh
    BX = LDT selector
    ES:(E)DI -> 8-byte buffer for copy of descriptor
Return: CF clear if successful
        buffer filled
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #2398)
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=000Ch
--------E-31000C-----------------------------
INT 31 P - DPMI 0.9+ - SET DESCRIPTOR
    AX = 000Ch
    BX = LDT selector
    ES:(E)DI -> 8-byte buffer containing descriptor
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see #2398)
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    only modify descriptors allocated with INT 31/AX=0000h
    DPMI 1.0+ automatically reloads any segment registers containing the
      selector being modified
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=000Bh
--------E-31000D-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE SPECIFIC LDT DESCRIPTOR
    AX = 000Dh
    BX = LDT selector
Return: CF clear if successful
        descriptor allocated
    CF set on error
        AX = error code (DPMI 1.0+) (8011h,8022h) (see #2398)
Notes:    free descriptor with INT 31/AX=0001h
    the first 16 descriptors (04h-7Ch) are reserved for this function, but
      some may already be in use by other applications under DPMI 0.9;
      DPMI 1.0 guarantees 16 descriptors per client
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0000h,AX=0001h
--------E-31000E-----------------------------
INT 31 P - DPMI 1.0+ - GET MULTIPLE DESCRIPTORS
    AX = 000Eh
    CX = number of descriptors to copy
    ES:(E)DI -> descriptor buffer (see #2399)
Return: CF clear if successful
        descriptors copied
    CF set on error
        AX = error code (8022h) (see #2398)
        CX = number of descriptors successfully copied
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    if the function fails, the first CX descriptors are valid; the
      remainder are not modified
SeeAlso: AX=000Bh,AX=000Fh

Format of DPMI descriptor buffer entry (one per descriptor to get):
Offset    Size    Description    (Table 2399)
 00h    WORD    selector (set by client)
 02h    QWORD    descriptor (set by host)
--------E-31000F-----------------------------
INT 31 P - DPMI 1.0+ - SET MULTIPLE DESCRIPTORS
    AX = 000Fh
    CX = number of descriptors to copy
    ES:(E)DI -> descriptor buffer (see #2400)
Return: CF clear if successful
        descriptors copied
    CF set on error
        AX = error code (8021h,8022h,8025h) (see #2398)
        CX = number of descriptors successfully copied
Notes:    16-bit programs use ES:DI as pointer, 32-bit must use ES:EDI
    if the function fails, the first CX descriptors are valid; the
      remainder are not modified
    DPMI 1.0+ automatically reloads any segment registers containing a
      selector being modified
SeeAlso: AX=000Ch,AX=000Eh

Format of DPMI descriptor buffer entry (one per descriptor to set):
Offset    Size    Description    (Table 2400)
 00h    WORD    selector
 02h    QWORD    descriptor
--------E-310100-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE DOS MEMORY BLOCK
    AX = 0100h
    BX = number of paragraphs to allocate
Return: CF clear if successful
        AX = real mode segment of allocated block
        DX = first selector for allocated block
    CF set on error
        AX = DOS error code (07h,08h) (see #1020 at INT 21/AH=59h/BX=0000h)
        (DPMI 1.0+) DPMI error code (8011h) (see #2398)
        BX = size (in paragraphs) of largest available block
Notes:    multiple contiguous selectors are allocated for blocks of more than 64K
      if the caller is a 16-bit program
    never modify or deallocate returned descriptors
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0101h,AX=0501h
--------E-310101-----------------------------
INT 31 P - DPMI 0.9+ - FREE DOS MEMORY BLOCK
    AX = 0101h
    DX = selector of block
Return: CF set if successful
    CF set on error
        AX = DOS error code (07h,09h) (see #1020 at INT 21/AH=59h/BX=0000h)
Notes:    all descriptors allocated for the block are automatically freed
    DPMI 1.0+ automatically zeros any segment registers containing a
      selector freed by this function
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0100h,AX=0102h,AX=0502h
--------E-310102-----------------------------
INT 31 P - DPMI 0.9+ - RESIZE DOS MEMORY BLOCK
    AX = 0102h
    BX = new block size in paragraphs
    DX = selector of block
Return: CF clear if successful
    CF set on error
        AX = DOS error code (07h,08h,09h)
          (see #1020 at INT 21/AH=59h/BX=0000h)
        (DPMI 1.0+) DPMI error code (8011h,8022h) (see #2398)
        BX = maximum block size (in paragraphs) possible
Notes:    increasing the size of a block past a 64K boundary will fail if the
      next descriptor in the LDT is already in use
    shrinking a block past a 64K boundary will cause some selectors to be
      freed; DPMI 1.0+ automatically zeros any segment registers containing
      a selector freed by this function
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0100h
--------E-310200-----------------------------
INT 31 P - DPMI 0.9+ - GET REAL MODE INTERRUPT VECTOR
    AX = 0200h
    BL = interrupt number
Return: CF clear
    CX:DX = segment:offset of real mode interrupt handler
Note:    the DPMI implementation is required to support all 256 vectors
SeeAlso: AX=0201h,AX=0204h,INT 21/AX=2503h
--------E-310201-----------------------------
INT 31 P - DPMI 0.9+ - SET REAL MODE INTERRUPT VECTOR
    AX = 0201h
    BL = interrupt number
    CX:DX = segment:offset of real mode handler
Return: CF clear
Note:    all memory that may be touched by a hardware interrupt handler must be
      locked down with INT 31/AX=0600h
SeeAlso: AX=0200h,AX=0205h,AX=0600h,INT 21/AX=2505h
--------E-310202-----------------------------
INT 31 P - DPMI 0.9+ - GET PROCESSOR EXCEPTION HANDLER VECTOR
    AX = 0202h
    BL = exception number (00h-1Fh)
Return: CF clear if successful
        CX:(E)DX = selector:offset of handler
    CF set on error
        AX = error code (DPMI 1.0+) (8021h) (see #2398)
Notes:    16-bit programs receive the pointer in CX:DX, 32-bit programs in CX:EDX
    DPMI 1.0+ supports this function only for backward compatibility; use
       AX=0210h or AX=0211h instead
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0203h,AX=0210h,AX=0211h,INT 2F/AX=FB42h/BX=0021h
--------E-310203-----------------------------
INT 31 P - DPMI 0.9+ - SET PROCESSOR EXCEPTION HANDLER VECTOR
    AX = 0203h
    BL = exception number (00h-1Fh)
    CX:(E)DX = selector:offset of handler
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8021h,8022h) (see #2398)
Notes:    32-bit programs must supply an offset in EDX and use a 32-bit interrupt
      stack frame on chaining to the next exception handler
    the handler should return using a FAR return
    all fault stack frames contain an error code, but it is only valid for
      exceptions 08h and 0Ah-0Eh
    handlers will only be called if the exception occurs in protected mode,
      and the DPMI host does not transparently handle the exception
    the handler may change certain values on the stack frame
      (see #2401,#2402)
    DPMI 1.0+ supports this function only for backward compatibility; use
       AX=0212h or AX=0213h instead
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0202h,AX=0212h,AX=0213h,INT 2F/AX=FB42h/BX=0022h

Format of stack frame for 16-bit programs: (offset from SS:SP)
Offset    Size    Description    (Table 2401)
 00h    DWORD    return CS:IP (do not change)
 04h    WORD    error code
 06h    DWORD    CS:IP of exception
 0Ah    WORD    flags
 0Ch    DWORD    SS:SP

Format of stack frame for 32-bit programs: (offset from SS:ESP)
Offset    Size    Description    (Table 2402)
 00h    DWORD    return EIP (do not change)
 04h    WORD    return CS selector (do not change)
 06h    WORD    reserved (do not change)
 08h    DWORD    error code
 0Ch    DWORD    EIP of exception
 10h    WORD    CS selector of exception
 12h    WORD    reserved (do not change)
 14h    DWORD    EFLAGS
 18h    DWORD    ESP
 1Ch    WORD    SS
 1Eh    WORD    reserved (do not change)
--------E-310204-----------------------------
INT 31 P - DPMI 0.9+ - GET PROTECTED MODE INTERRUPT VECTOR
    AX = 0204h
    BL = interrupt number
Return: CF clear
    CX:(E)DX = selector:offset of handler
Notes:    16-bit programs use CX:DX, 32-bit programs use CX:EDX
    DPMI implementations are required to support all 256 vectors
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0200h,AX=0205h,INT 21/AX=2502h,INT 2C/AX=0006h
SeeAlso: INT 2F/AX=FB42h/BX=0024h
--------E-310205-----------------------------
INT 31 P - DPMI 0.9+ - SET PROTECTED MODE INTERRUPT VECTOR
    AX = 0205h
    BL = interrupt number
    CX:(E)DX = selector:offset of handler
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8022h) (see #2398)
Notes:    16-bit programs use CX:DX, 32-bit programs use CX:EDX
    32-bit programs must use a 32-bit interrupt stack frame when chaining
      to the next handler
    DPMI implementations are required to support all 256 vectors
    hardware interrupts are reflected to the virtual machine's primary
      client, software interrupts to the current client
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0201h,AX=0204h,INT 21/AX=2504h,INT 2C/AX=0007h
SeeAlso: INT 2F/AX=FB42h/BX=0025h
--------E-310210-----------------------------
INT 31 P - DPMI 1.0+ - GET PROTECTED MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0210h
    BL = exception number (00h-1Fh)
Return: CF clear if successful
        CX:(E)DX = selector:offset of exception handler
    CF set on error
        AX = error code (8021h) (see #2398)
Note:    DPMI host reflects exception to current client's handler
SeeAlso: AX=0202h,AX=0211h,AX=0212h
--------E-310211-----------------------------
INT 31 P - DPMI 1.0+ - GET REAL MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0211h
    BL = exception number (00h-1Fh)
Return: CF clear if successful
        CX:(E)DX = selector:offset of exception handler
    CF set on error
        AX = error code (8021h) (see #2398)
Notes:    returns address of protected-mode handler for real-mode exception
    DPMI host performs a switch to protected mode, reflects the exception
      to the virtual machine's primary client, and returns to real mode
      on the handler's completion
SeeAlso: AX=0202h,AX=0210h,AX=0213h
--------E-310212-----------------------------
INT 31 P - DPMI 1.0+ - SET PROTECTED MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0212h
    BL = exception or fault number (00h-1Fh)
    CX:(E)DX = exception handler selector:offset
Return: CF clear if successful
    CF set on error
        AX = error code (8021h,8022h) (see #2398)
Note:    DPMI host sends exception to current client's handler
SeeAlso: AX=0203h,AX=0210h,AX=0213h
--------E-310213-----------------------------
INT 31 P - DPMI 1.0+ - SET REAL MODE EXTENDED PROCESSOR EXCEPTION HANDLER
    AX = 0213h
    BL = exception or fault number (00h-1Fh)
    CX:(E)DX = exception handler selector:offset
Return: CF clear if successful
    CF set on error
        AX = error code (8021h,8022h) (see #2398)
Notes:    specifies address of protected-mode handler for real-mode exception
    DPMI host performs a switch to protected mode, reflects the exception
      to the virtual machine's primary client, and returns to real mode
      on the handler's completion
SeeAlso: AX=0203h,AX=0211h,AX=0212h
--------E-310300-----------------------------
INT 31 P - DPMI 0.9+ - SIMULATE REAL MODE INTERRUPT
    AX = 0300h
    BL = interrupt number
    BH = flags
        bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
            reserved, must be 0 (DPMI 1.0+)
        others: reserved, must be 0
    CX = number of words to copy from protected mode to real mode stack
    ES:(E)DI = selector:offset of real mode call structure (see #2403)
Return: CF clear if successful
        real mode call structure modified (all fields except SS:SP, CS:IP
          filled with return values from real mode interrupt)
    CF set on error
        AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #2398)
    protected mode stack unchanged
Notes:    16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI
    CS:IP in the real mode call structure is ignored for this call,
      instead, the indicated interrupt vector is used for the address
    the flags in the call structure are pushed on the real mode stack to
      form an interrupt stack frame, and the trace and interrupt flags are
      clear on entry to the handler
    DPMI will provide a small (30 words) real mode stack if SS:SP is zero
    the real mode handler must return with the stack in the same state as
      it was on being called
SeeAlso: AX=0302h,AX=FF01h,INT 21/AX=2511h,INT 21/AH=E3h"OS/286"
SeeAlso: INT 2C/AX=0026h,INT 2F/AX=FB42h/BX=000Dh

Format of DPMI real mode call structure:
Offset    Size    Description    (Table 2403)
 00h    DWORD    EDI
 04h    DWORD    ESI
 08h    DWORD    EBP
 0Ch    DWORD    reserved (00h)
 10h    DWORD    EBX
 14h    DWORD    EDX
 18h    DWORD    ECX
 1Ch    DWORD    EAX
 20h    WORD    flags
 22h    WORD    ES
 24h    WORD    DS
 26h    WORD    FS
 28h    WORD    GS
 2Ah    WORD    IP
 2Ch    WORD    CS
 2Eh    WORD    SP
 30h    WORD    SS
--------E-310301-----------------------------
INT 31 P - DPMI 0.9+ - CALL REAL MODE PROCEDURE WITH FAR RETURN FRAME
    AX = 0301h
    BH = flags
        bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
            reserved, must be 0 (DPMI 1.0+)
        others: reserved must be 0
    CX = number of words to copy from protected mode to real mode stack
    ES:(E)DI = selector:offset of real mode call structure
          (see #2403 at INT 31/AX=0300h)
Return: CF clear if successful
        real mode call structure modified (all fields except SS:SP, CS:IP
          filled with return values from real mode interrupt)
    CF set on error
        AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #2398)
    protected mode stack unchanged
Notes:    16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI
    the real mode procedure must exit with a FAR return
    DPMI will provide a small (30 words) real mode stack if SS:SP is zero
    the real mode handler must return with the stack in the same state as
      it was on being called
SeeAlso: AX=0300h,AX=0302h,AX=FF02h,INT 21/AX=250Eh,INT 21/AH=E1h"OS/286"
SeeAlso: INT 2C/AX=0025h
--------E-310302-----------------------------
INT 31 P - DPMI 0.9+ - CALL REAL MODE PROCEDURE WITH IRET FRAME
    AX = 0302h
    BH = flags
        bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
            reserved, must be 0 (DPMI 1.0+)
        others: reserved, must be 0
    CX = number of words to copy from protected mode to real mode stack
    ES:(E)DI = selector:offset of real mode call structure
          (see #2403 at INT 31/AX=0300h)
Return: CF clear if successful
        real mode call structure modified (all fields except SS:SP, CS:IP
          filled with return values from real mode interrupt)
    CF set on error
        AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #2398)
    protected mode stack unchanged
Notes:    16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI
    the flags in the call structure are pushed on the real mode stack to
      form an interrupt stack frame, and the trace and interrupt flags are
      clear on entry to the handler
    the real mode procedure must exit with an IRET
    DPMI will provide a small (30 words) real mode stack if SS:SP is zero
    the real mode handler must return with the stack in the same state as
      it was on being called
SeeAlso: AX=0300h
--------E-310303-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE REAL MODE CALLBACK ADDRESS
    AX = 0303h
    DS:(E)SI = selector:offset of procedure to call
    ES:(E)DI = selector:offset of real mode call structure (see #2403)
Return: CF clear if successful
        CX:DX = segment:offset of real mode call address (see #2404)
    CF set on error
        AX = error code (DPMI 1.0+) (8015h) (see #2398)
Notes:    the real mode call structure is static, causing reentrancy problems;
      its contents are only valid at the time of a callback
    the called procedure must modify the real mode CS:IP before returning
    values are returned to real mode by modifying the real mode call struc
    DPMI hosts must provide at least 16 callbacks per client
    the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 does
      not support this function
SeeAlso: AX=0304h,AX=0C00h

(Table 2404)
Values DPMI real-mode callback procedure is called with:
    DS:(E)SI = selector:offset of real mode SS:SP
    ES:(E)DI = selector:offset of real mode call structure
    SS:(E)SP = locked protected mode API stack
    interrupts disabled
Return: (with IRET)
    ES:(E)DI = selector:offset of real mode call structure to restore
--------E-310304-----------------------------
INT 31 P - DPMI 0.9+ - FREE REAL MODE CALLBACK ADDRESS
    AX = 0304h
    CX:DX = real mode callback address
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8024h) (see #2398)
Note:    the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 does
      not support this function
SeeAlso: AX=0303h
--------E-310305-----------------------------
INT 31 P - DPMI 0.9+ - GET STATE SAVE/RESTORE ADDRESSES
    AX = 0305h
Return: CF clear
    AX = size in bytes of state buffer
    BX:CX = real mode address of procedure to save/restore state
    SI:(E)DI = protected mode procedure to save/restore state (see #2405)
Notes:    the buffer size will be zero if it is not necessary to preserve state
    16-bit programs should call SI:DI, 32-bit programs should call SI:EDI
    this function is only needed if using the raw mode switch service
SeeAlso: AX=0306h

(Table 2405)
Call DPMI state-save procedures with:
    AL = direction
        00h save state
        01h restore state
    ES:(E)DI -> state buffer
Return: all registers preserved
--------E-310306-----------------------------
INT 31 P - DPMI 0.9+ - GET RAW MODE SWITCH ADDRESSES
    AX = 0306h
Return: CF clear
    BX:CX -> procedure to switch from real to protected mode (see #2406)
    SI:(E)DI -> procedure to switch from protected to real mode
Notes:    16-bit programs should jump to SI:DI, 32-bit programs should use SI:EDI
    the caller must save and restore the state of the task with AX=0305h
    not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0305h

(Table 2406)
Values to JUMP at mode-switch procedures with:
    AX = new DS
    CX = new ES
    DX = new SS
    (E)BX = new (E)SP
    SI:(E)DI = new CS:(E)IP
Notes:    BP/EBP is preserved across the call, but AX/EAX, BX/EBX, CX/ECX,
      DX/EDX, SI/ESI, and DI/EDI will be undefined; FS and GS will be 0000h
    interrupts will stay disabled during the entire mode switch if they
      are disabled on entry to the mode-switch procedure
--------E-310400-----------------------------
INT 31 P - DPMI 0.9+ - GET DPMI VERSION
    AX = 0400h
Return: CF clear
    AH = major version of DPMI spec supported
    AL = two-digit minor version of DPMI spec supported
    BX = DPMI host flags (see #2407)
    CL = processor type (02h=80286, 03h=80386, 04h=80486)
    DH = curr value of virtual master interrupt controller base interrupt
    DL = curr value of virtual slave interrupt controller base interrupt
BUG:    Windows NT versions from the March 1993 beta to at least the Final
      release with fixes to CSD002 report version 0090h (0.144); this has
      reportedly been corrected in the Windows NT 3.5 beta
SeeAlso: AX=0401h,INT 21/AX=250Ch,INT 2F/AX=1687h,INT 4B/AX=8102h/DX=0000h
SeeAlso: INT 67/AX=DE0Ah

Bitfields for DPMI host flags:
Bit(s)    Description    (Table 2407)
 0    running under an 80386 (32-bit) implementation
 1    processor returns to real mode for reflected interrupts instead of V86
      mode
 2    virtual memory supported
 3    reserved (undefined)
 4-15    reserved (zero)
--------E-310401-----------------------------
INT 31 P - DPMI 1.0+ - GET DPMI CAPABILITIES
    AX = 0401h
    ES:(E)DI -> 128-byte buffer for host description (see #2408)
Return: CF clear if successful
        AX = capabilities (see #2409)
        CX = reserved (00h)
        DX = reserved (00h)
        buffer filled
    CF set on error (DPMI 0.9 only)
SeeAlso: AX=0400h

Format of DPMI host description:
Offset    Size    Description    (Table 2408)
 00h    BYTE    host major version number
 01h    BYTE    host minor version number
 02h 126 BYTEs    ASCIZ host vendor name

Bitfields for DPMI capabilities:
Bit(s)    Description    (Table 2409)
 0    paged accessed/dirty supported (see AX=0506h,AX=0507h)
 1    exceptions restartability supported
 2    device mapping supported (see AX=0508h)
 3    conventional memory mapping supported (see AX=0509h)
 4    demand zero-fill supported
 5    write-protect client capability supported
 6    write-protect host capability supported
 7-15    reserved
--------E-310500-----------------------------
INT 31 P - DPMI 0.9+ - GET FREE MEMORY INFORMATION
    AX = 0500h
    ES:(E)DI -> buffer for memory information (see #2410)
Return: CF clear
Notes:    16-bit programs use ES:DI, 32-bit programs use ES:EDI
    this function must be considered advisory because other applications
      may affect the results at any time after the call
    fields not supported by the DPMI implementation are filled with
      FFFFFFFFh
    DPMI 1.0+ supports this function solely for backward compatibility; use
      AX=050Bh instead
    the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 only
      returns the first field in the memory information record
SeeAlso: AX=0501h,AX=050Bh,AX=0604h

Format of DPMI memory information:
Offset    Size    Description    (Table 2410)
 00h    DWORD    largest available block in bytes
 04h    DWORD    maximum unlocked page allocation
 08h    DWORD    maximum locked page allocation
 0Ch    DWORD    total linear address space in pages
 10h    DWORD    total unlocked pages
 14h    DWORD    free pages
 18h    DWORD    total physical pages
 1Ch    DWORD    free linear address space in pages
 20h    DWORD    size of paging file/partition in pages
 24h 12 BYTEs    reserved
--------E-310501-----------------------------
INT 31 P - DPMI 0.9+ - ALLOCATE MEMORY BLOCK
    AX = 0501h
    BX:CX = size in bytes
Return: CF clear if successful
        BX:CX = linear address of block
        SI:DI = memory block handle for resizing and freeing block
    CF set on error
        AX = error code (DPMI 1.0+) (8012h-8014h,8016h,8021h)(see #2398)
Notes:    no selectors are allocated
    the memory block is allocated unlocked (can be locked with AX=0600h)
    allocations are often page granular (see AX=0604h)
    under MS Windows 3.10 Enhanced mode with paging enabled, it is possible
      for this function to fail even if AX=0500h indicates that enough
      memory is available
SeeAlso: AX=0000h,AX=0100h,AX=0500h,AX=0502h,AX=0503h,AX=0504h,AX=0D00h
SeeAlso: INT 2F/AX=FB42h/BX=0002h
--------E-310502-----------------------------
INT 31 P - DPMI 0.9+ - FREE MEMORY BLOCK
    AX = 0502h
    SI:DI = handle of memory block
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #2398)
Note:    any selectors allocated for the memory block must also be freed,
      preferably before freeing the memory block
SeeAlso: AX=0001h,AX=0101h,AX=0501h,AX=0D01h
--------E-310503-----------------------------
INT 31 P - DPMI 0.9+ - RESIZE MEMORY BLOCK
    AX = 0503h
    BX:CX = new size in bytes (nonzero)
    SI:DI = handle of memory block
Return: CF clear if successful
        BX:CX = new linear address
        SI:DI = new handle of memory block
    CF set on error
        AX = error code (DPMI 1.0+) (8012h-8014h,8016h,8021h,8023h)
        (see #2398)
Notes:    any selectors pointing at the block must be updated
    the previous memory block handle becomes invalid
    an error is returned if the new size is 0
SeeAlso: AX=0102h,AX=0501h,AX=0505h
--------E-310504-----------------------------
INT 31 P - DPMI 1.0+ - ALLOCATE LINEAR MEMORY BLOCK
    AX = 0504h
    EBX = page-aligned linear address of memory block (00000000h if any
          address is acceptable)
    ECX = size in bytes (nonzero)
    EDX = flags
        bit 0: set to create committed pages instead of uncommitted pages
        bits 1-31 reserved (0)
Return: CF clear if successful
        EBX = linear address of memory block
        ESI = memory block handle
    CF set on error
        AX = error code (8001h,8012h-8014h,8016h,8021h,8025h)(see #2398)
Note:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
SeeAlso: AX=0501h,AX=0505h
--------E-310505-----------------------------
INT 31 P - DPMI 1.0+ - RESIZE LINEAR MEMORY BLOCK
    AX = 0505h
    ESI = memory block handle
    ECX = new size in bytes (nonzero)
    EDX = flags
        bit 0: create committed pages rather than uncommitted pages
        bit 1: segment descriptor update required
        ES:EBX -> buffer containing array of WORDs with selectors
        EDI = number of selectors in array
        bits 2-31 reserved (0)
Return: CF clear if successful
        EBX = new linear base address
        ESI = new memory block handle
    CF set on error
        AX = error code (8001h,8012h-8014h,8016h,8021h,8023h)(see #2398)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    the old memory block handle becomes invalid
    if EDX bit 1 set and the block's base address is changed, DPMI updates
      all descriptors for selectors in the update buffer which fall within
      the memory block
SeeAlso: AX=0503h,AX=0504h
--------E-310506-----------------------------
INT 31 P - DPMI 1.0+ - GET PAGE ATTRIBUTES
    AX = 0506h
    ESI = memory block handle
    EBX = offset in memory block of first page
    ECX = number of pages
    ES:EDX -> array of WORDs to hold page attributes (see #2411)
Return: CF clear if successful
        buffer filled
    CF set on error
        AX = error code (8001h,8023h,8025h) (see #2398)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    if EBX is not page-aligned, it will be rounded down
SeeAlso: AX=0504h,AX=0507h,INT 21/AX=251Dh,INT 21/AX=EB00h

Bitfields for DPMI page attribute word:
Bit(s)    Description    (Table 2411)
 0-2    page type
    000 uncommitted
    001 committed
    010 mapped (see AX=0508h,AX=0509h)
    other currently unused
 3    page is read/write rather than read-only
 4    accessed/dirty bits supplied in bits 5 and 6
 5    page has been accessed (only valid if bit 4 set)
 6    page has been written (only valid if bit 4 set)
 7-15    reserved (0)
--------E-310507-----------------------------
INT 31 P - DPMI 1.0+ - MODIFY PAGE ATTRIBUTES
    AX = 0507h
    ESI = memory block handle
    EBX = offset in memory block of first page
    ECX = number of pages
    ES:EDX -> array of WORDs with new page attributes (see #2411)
Return: CF clear if successful
    CF set on error
        AX = error code (8001h,8002h,8013h,8014h,8021h,8023h,8025h)
        (see #2398)
        ECX = number of pages which have been set
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    if EBX is not page-aligned, it will be rounded down
SeeAlso: AX=0504h,AX=0506h,INT 21/AX=251Eh
--------E-310508-----------------------------
INT 31 P - DPMI 1.0+ - MAP DEVICE IN MEMORY BLOCK
    AX = 0508h
    ESI = memory block handle
    EBX = page-aligned offset within memory block of page(s) to be mapped
    ECX = number of pages to map
    EDX = page-aligned physical address of device
Return: CF clear if successful
    CF set on error
        AX = error code (8001h,8003h,8023h,8025h) (see #2398)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    support of this function is optional; hosts are also allowed to support
      the function for some devices but not others
SeeAlso: AX=0504h,AX=0509h,AX=0800h,AX=0801h
--------E-310509-----------------------------
INT 31 P - DPMI 1.0+ - MAP CONVENTIONAL MEMORY IN MEMORY BLOCK
    AX = 0509h
    ESI = memory block handle
    EBX = page-aligned offset within memory block of page(s) to map
    ECX = number of pages to map
    EDX = page-aligned linear address of conventional (below 1M) memory
Return: CF clear if successful
    CF set on error
        AX = error code (8001h,8003h,8023h,8025h) (see #2398)
Notes:    only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
    support of this function is optional
SeeAlso: AX=0504h,AX=0508h,AX=0801h
--------E-31050A-----------------------------
INT 31 P - DPMI 1.0+ - GET MEMORY BLOCK SIZE AND BASE
    AX = 050Ah
    SI:DI = memory block handle
Return: CF clear if successful
        SI:DI = size in bytes
        BX:CX = base address
    CF set on error
        AX = error code (8023h) (see #2398)
SeeAlso: AX=0501h,AX=0504h
--------E-31050B-----------------------------
INT 31 P - DPMI 1.0+ - GET MEMORY INFORMATION
    AX = 050Bh
    ES:(E)DI -> 128-byte buffer for memory information (see #2412)
Return: CF clear if successful
    CF set on error (DPMI 0.9 only)
Note:    16-bit programs use ES:DI, 32-bit programs must use ES:EDI
SeeAlso: AX=0500h

Format of DPMI memory information:
Offset    Size    Description    (Table 2412)
 00h    DWORD    total allocated bytes of physical memory controlled by host
 04h    DWORD    total allocated bytes of virtual memory controlled by host
 08h    DWORD    total available bytes of virtual memory controlled by host
 0Ch    DWORD    total allocated bytes of virtual memory for curr virtual mach
 10h    DWORD    total available bytes of virtual memory for curr virtual mach
 14h    DWORD    total allocated bytes of virtual memory for current client
 18h    DWORD    total available bytes of virtual memory for current client
 1Ch    DWORD    total locked bytes for current client
 20h    DWORD    maximum locked bytes for current client
 24h    DWORD    highest linear address available to current client
 28h    DWORD    largest available memory block in bytes
 2Ch    DWORD    minimum allocation unit in bytes
 30h    DWORD    allocation alignment unit size in bytes
 34h 76 BYTEs    reserved (00h)
--------E-310600-----------------------------
INT 31 P - DPMI 0.9+ - LOCK LINEAR REGION
    AX = 0600h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is locked
        AX = error code (DPMI 1.0+) (8013h,8017h,8025h) (see #2398)
Notes:    pages at beginning and end will be locked if the region overlaps them
    may be called multiple times for a given page; the DPMI host keeps a
      lock count for each page
SeeAlso: AX=0004h,AX=0601h,INT 21/AX=251Ah,INT 21/AX=EB06h
--------E-310601-----------------------------
INT 31 P - DPMI 0.9+ - UNLOCK LINEAR REGION
    AX = 0601h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is unlocked
        AX = error code (DPMI 1.0+) (8002h,8025h) (see #2398)
Notes:    pages at beginning and end will be unlocked if the region overlaps them
    memory whose lock count has not reached zero remains locked
SeeAlso: AX=0005h,AX=0600h,INT 21/AX=251Bh,INT 21/AX=EB07h
--------E-310602-----------------------------
INT 31 P - DPMI 0.9+ - MARK REAL MODE REGION AS PAGEABLE
    AX = 0602h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is made pageable
        AX = error code (DPMI 1.0+) (8002h,8025h) (see #2398)
Notes:    must relock all unlocked real mode memory before terminating process
      for DPMI 0.9; DPMI 1.0+ automatically relocks real mode memory
    pages at beginning and end will be unlocked if the region overlaps them
    pageability of real mode pages is binary, not a count
SeeAlso: AX=0600h,AX=0603h
--------E-310603-----------------------------
INT 31 P - DPMI 0.9+ - RELOCK REAL MODE REGION
    AX = 0603h
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
        none of the memory is relocked
        AX = error code (DPMI 1.0+) (8002h,8013h,8025h) (see #2398)
Notes:    pages at beginning and end will be relocked if the region overlaps them
    pageability of real mode pages is binary, not a count
SeeAlso: AX=0602h
--------E-310604-----------------------------
INT 31 P - DPMI 0.9+ - GET PAGE SIZE
    AX = 0604h
Return: CF clear if successful
        BX:CX = page size in bytes
    CF set on error
        AX = error code (DPMI 1.0+) (see also #2398)
        8001h unsupported, 16-bit host
BUG:    the Borland C++ 3.1 DPMILOAD returns with CF clear but BX and CX
      unchanged
--------E-310700-----------------------------
INT 31 Pu - DPMI 0.9+ - MARK PAGES AS PAGING CANDIDATES
    AX = 0700h
    BX:CX = starting linear page number
    SI:DI = number of pages to mark as paging candidates
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0701h,AX=0702h
--------E-310701-----------------------------
INT 31 Pu - DPMI 0.9+ - DISCARD PAGES
    AX = 0701h
    BX:CX = starting linear page number
    SI:DI = number of pages to discard
Return: ???
Note:    although marked as reserved in versions 0.9 and 1.0 of the DPMI
      specification, this function is called by MS Windows TASKMAN,
      PROGMAN, and KERNEL
SeeAlso: AX=0700h,AX=0703h
--------E-310702-----------------------------
INT 31 P - DPMI 0.9+ - MARK PAGE AS DEMAND PAGING CANDIDATE
    AX = 0702h
    BX:CX = starting linear address
    SI:DI = number of bytes to mark as paging candidates
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8025h) (see #2398)
Notes:    this function is advisory, and does not force immediate paging
    partial pages will not be discarded
SeeAlso: AX=0700h,AX=0703h
--------E-310703-----------------------------
INT 31 P - DPMI 0.9+ - DISCARD PAGE CONTENTS
    AX = 0703h
    BX:CX = starting linear address
    SI:DI = number of bytes to mark as discarded
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8025h) (see #2398)
Notes:    this function is advisory, and may be ignored by DPMI implementations
    partial pages will not be discarded
SeeAlso: AX=0701h,AX=0702h
--------E-310800-----------------------------
INT 31 P - DPMI 0.9+ - PHYSICAL ADDRESS MAPPING
    AX = 0800h
    BX:CX = physical address (should be above 1 MB)
    SI:DI = size in bytes
Return: CF clear if successful
        BX:CX = linear address which maps the requested physical memory
    CF set on error
        AX = error code (DPMI 1.0+) (8003h,8021h) (see #2398)
Notes:    implementations may refuse this call because it can circumvent protects
    the caller must build an appropriate selector for the memory
    do not use for memory mapped in the first megabyte
SeeAlso: AX=0002h,AX=0508h,AX=0509h,AX=0801h,INT 21/AX=250Ah,INT 21/AX=EB05h
--------E-310801-----------------------------
INT 31 P - DPMI 1.0+ - FREE PHYSICAL ADDRESS MAPPING
    AX = 0801h
    BX:CX = linear address returned by AX=0800h
Return: CF clear if successful
    CF set on error
        AX = error code (8025h) (see #2398)
Note:    should be called at end of access to device mapped with AX=0800h
SeeAlso: AX=0508h,AX=0509h,AX=0800h,INT 21/AX=EB03h
--------E-310900-----------------------------
INT 31 P - DPMI 0.9+ - GET AND DISABLE VIRTUAL INTERRUPT STATE
    AX = 0900h
Return: CF clear
    virtual interrupts disabled
    AL = previous interrupt state (00h disabled, 01h enabled)
    AH preserved
Notes:    the previous state may be restored simply by executing another INT 31
    a CLI instruction may be used if the previous state is unimportant,
      but should be assumed to be very slow due to trapping by the host
SeeAlso: AX=0901h,AX=0902h
--------E-310901-----------------------------
INT 31 P - DPMI 0.9+ - GET AND ENABLE VIRTUAL INTERRUPT STATE
    AX = 0901h
Return: CF clear
    virtual interrupts enabled
    AL = previous interrupt state (00h disabled, 01h enabled)
    AH preserved
Notes:    the previous state may be restored simply by executing another INT 31
    a STI instruction may be used if the previous state is unimportant,
      but should be assumed to be very slow due to trapping by the host
SeeAlso: AX=0900h,AX=0902h
--------E-310902-----------------------------
INT 31 P - DPMI 0.9+ - GET VIRTUAL INTERRUPT STATE
    AX = 0902h
Return: CF clear
    AL = current interrupt state (00h disabled, 01h enabled)
Note:    should be used rather than PUSHF because that instruction yields the
      physical interrupt state rather than the per-client virtualized
      interrupt flag
SeeAlso: AX=0900h,AX=0901h
--------E-310A00-----------------------------
INT 31 P - DPMI 0.9+ - GET VENDOR SPECIFIC API ENTRY POINT
    AX = 0A00h
    DS:(E)SI -> case-sensitive ASCIZ vendor name or identifier
Return: CF clear if successful
        ES:(E)DI -> FAR extended API entry point
        DS, FS, GS, EAX, EBX, ECX, EDX, ESI, EBP destroyed
    CF set on error
        AX = error code (DPMI 1.0+) (8001h) (see #2398)
Notes:    extended API parameters are vendor-specific
    DPMI 1.0+ supports this function solely for backward compatibility; use
      INT 2F/AX=168Ah instead
    this function is not supported by MS Windows 3.10, BC++ 3.1 DPMILOAD,
      or QDPMI v1.0x; use INT 2F/AX=168Ah instead.    It is supported by
      386MAX v7.01.
SeeAlso: INT 2F/AX=168Ah
--------E-310B00-----------------------------
INT 31 P - DPMI 0.9+ - SET DEBUG WATCHPOINT
    AX = 0B00h
    BX:CX = linear address
    DL = size (1,2,4 bytes)
    DH = type (00h execute, 01h write, 02h read/write)
Return: CF clear if successful
        BX = watchpoint handle
    CF set on error
        AX = error code (DPMI 1.0+) (8016h,8021h,8025h) (see #2398)
SeeAlso: AX=0212h,AX=0601h
--------E-310B01-----------------------------
INT 31 P - DPMI 0.9+ - CLEAR DEBUG WATCHPOINT
    AX = 0B01h
    BX = watchpoint handle
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #2398)
Note:    the watchpoint handle is freed
SeeAlso: AX=0B00h
--------E-310B02-----------------------------
INT 31 P - DPMI 0.9+ - GET STATE OF DEBUG WATCHPOINT
    AX = 0B02h
    BX = watchpoint handle
Return: CF clear if successful
        AX = status flags
        bit 0: watch point has been executed since AX=0B00h or AX=0B03h
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #2398)
SeeAlso: AX=0B00h,AX=0B03h
--------E-310B03-----------------------------
INT 31 P - DPMI 0.9+ - RESET DEBUG WATCHPOINT
    AX = 0B03h
    BX = watchpoint handle
Return: CF clear if successful
    CF set on error
        AX = error code (DPMI 1.0+) (8023h) (see #2398)
SeeAlso: AX=0B02h
--------E-310C00-----------------------------
INT 31 P - DPMI 1.0+ - INSTALL RESIDENT HANDLER INIT CALLBACK
    AX = 0C00h
    ES:(E)DI -> resident service provider structure (see #2413)
Return: CF clear if successful
    CF set on error
        AX = error code (8015h,8021h,8025h) (see #2398 at AX=0000h)
Note:    calling this function declares an intent to provide resident
      protected mode services after terminating with AX=0C01h
SeeAlso: AX=0303h,AX=0C01h

Format of DPMI resident service provider structure:
Offset    Size    Description    (Table 2413)
 00h    QWORD    descriptor for 16-bit data segment
 08h    QWORD    descriptor for 16-bit code segment (zeros if not supported)
 10h    WORD    offset of 16-bit callback procedure
 12h  2 BYTEs    reserved
 14h    QWORD    descriptor for 32-bit data segment
 1Ch    QWORD    descriptor for 32-bit code segment (zeros if not supported)
 24h    DWORD    offset of 32-bit callback procedure
--------E-310C01-----------------------------
INT 31 P - DPMI 1.0+ - TERMINATE AND STAY RESIDENT
    AX = 0C01h
    BL = return code
    DX = number of paragraphs of DOS memory to reserve (0 or >= 6)
Return: never
Notes:    should only be used if the program will only provide services to
      other DPMI programs
    any protected mode memory remains allocated to the program unless
      explicitly freed before this call
    must first call AX=0C00h or program will simply be terminated
SeeAlso: AX=0C00h,INT 21/AH=31h
--------E-310D00-----------------------------
INT 31 P - DPMI 1.0+ - ALLOCATE SHARED MEMORY
    AX = 0D00h
    ES:(E)DI -> shared memory allocation request structure (see #2414)
Return: CF clear if successful
        request structure updated
    CF set on error
        AX = error code (8012h,8013h,8014h,8016h,8021h) (see #2398)
Note:    first 16 bytes of memory block will be initialized to zeros on the
      first allocation
SeeAlso: AX=0501h,AX=0D01h,AX=0D02h

Format of DPMI shared memory allocation request structure:
Offset    Size    Description    (Table 2414)
 00h    DWORD    requested length of shared memory block in bytes
 04h    DWORD    (ret) allocated length of block
 08h    DWORD    (ret) shared memory handle
 0Ch    DWORD    (ret) linear address of memory block
 10h    PWORD    selector:offset32 of ASCIZ name for memory block
        (name max 128 bytes)
 16h  2 BYTEs    reserved
 18h  4 BYTEs    reserved (00h)
--------E-310D01-----------------------------
INT 31 P - DPMI 1.0+ - FREE SHARED MEMORY
    AX = 0D01h
    SI:DI = shared memory block handle
Return: CF clear if successful
    CF set on error
        AX = error code (8023h) (see #2398)
Notes:    handle becomes invalid after this call
    DPMI maintains separate global and virtual machine use counts for each
      shared memory block; when the global use counts reaches zero, the
      block is finally destroyed
SeeAlso: AX=0502h,AX=0D00h
--------E-310D02-----------------------------
INT 31 P - DPMI 1.0+ - SERIALIZE SHARED MEMORY
    AX = 0D02h
    SI:DI = shared memory block handle
    DX = flags
        bit 0: return immediately rather than suspending if serialization
          unavailable
        bit 1: shared rather than exclusive serialization
        bits 2-15 reserved (0)
Return: CF clear if successful
    CF set on error
        AX = error code (8004h,8005h,8017h-8019h,8023h) (see #2398)
Notes:    an exclusive serialization blocks any other serialization attempts for
      the same block by another virtual machine; a shared serialization
      blocks attempts at exclusive serialization by another virtual machine
    hosts are not required to detect deadlock
    a client's interrupt handler can cancel a serialization call which
      caused it to block by calling AX=0D03h
SeeAlso: AX=0D00h,AX=0D03h
--------E-310D03-----------------------------
INT 31 P - DPMI 1.0+ - FREE SERIALIZATION ON SHARED MEMORY
    AX = 0D03h
    SI:DI = shared memory block handle
    DX = flags
        bit 0: release shared serialization rather than exclusive serialztn
        bit 1: free pending serialization
        bits 2-15 reserved (0)
Return: CF clear if successful
    CF set on error
        AX = error code (8002h,8023h) (see #2398 at AX=0000h)
SeeAlso: AX=0D00h,AX=0D02h
--------E-310E00-----------------------------
INT 31 P - DPMI 1.0+ - GET COPROCESSOR STATUS
    AX = 0E00h
Return: CF clear
    AX = coprocessor status (see #2415)
Note:    supported by 386MAX v6.01, which otherwise only supports DPMI 0.9
SeeAlso: AX=0E01h

Bitfields for DPMI coprocessor status:
Bit(s)    Description    (Table 2415)
 0    numeric coprocessor enabled for current client
 1    client is emulating coprocessor
 2    numeric coprocessor is present
 3    host is emulating coprocessor instructions
 4-7    coprocessor type
    0000 none
    0010 80287
    0011 80387
    0100 80486 with numeric coprocessor
    other reserved
 8-15    not used
--------E-310E01-----------------------------
INT 31 P - DPMI 1.0+ - SET EMULATION
    AX = 0E01h
    BX = coprocessor flag bits (see #2416)
Return: CF clear if successful
    CF set on error
        AX = error code (8026h) (see #2398 at AX=0000h)
Note:    supported by 386MAX v6.01, which otherwise only supports DPMI 0.9
SeeAlso: AX=0E00h

Bitfields for DPMI coprocessor flags:
Bit(s)    Description    (Table 2416)
 0    enable numeric coprocessor for current client
 1    client will emulate coprocessor
 2-15    not used
--------E-3157-------------------------------
INT 31 - Netroom3 DPMI.EXE v3.00 - ???
    AH = 57h
    AL = subfunction (at least 02h,03h,04h,05h,07h,08h,09h,0Ah)
    ???
Return: ???
SeeAlso: INT 2C/AX=0000h"Cloaking"
--------E-315702-----------------------------
INT 31 - Netroom3 DPMI.EXE v3.00 - SWITCH TO PROTECTED MODE
    AX = 5702h
    DX = PSP segment of caller
    STACK: WORD    ???
           WORD    flags (bit 0 set if 32-bit program)
Return: as for DPMI mode-switch entry point (see #2001 at INT 2F/AX=1687h)
Note:    this function is called by the real-mode DPMI mode-switch entry point
SeeAlso: INT 2F/AX=1687h
--------E-31EE00------------------------
INT 31 - DOS32 v3.0+ - GET DOS32 VERSION AND SELECTOR VALUES
    AX = EE00h
Return: AL = minor version (BCD)
    AH = major version (BCD)
    DL = system type (1=raw DOS, 2=XMS, 4=VCPI, 8=DPMI)
    BX = selector of 4GB data segment with zero base address
Program: DOS32 is a 32 bit DOS extender by Adam Seychell.
SeeAlso: AX=EE02h
--------E-31EE02------------------------
INT 31 - DOS32 v3.0+ - GET DOS32 ADDRESS INFORMATION
    AX = EE02h
Return: AX = real-mode segment of temporary 8K buffer (v3.1+)
    EBX = 32bit linear address of the program segment
    EDX = Total size in bytes of the programs .EXE file after linking.
    ESI = offset address of PSP
    EDI = offset address of program environment
    ECX = offset address of the program's .EXE ASCIZ file name and path
SeeAlso: AX=EE00h,AX=EE20h
--------E-31EE10------------------------
INT 31 - DOS32 v3.2+ - SET UP A DOS32 LOADABLE LIBRARY
    AX = EE10h
    EDX -> library ASCIZ path\filename
    EBX = number of bytes to seek from beginning of file
Return: CF clear if successful
        EAX = size of memory block required to store library
        EBX = size of library file
    CF set on error
        AL = error code.
        01h error opening or reading file
        02h bad DOS32 library file
SeeAlso: AX=EE00h,AX=EE11h
--------E-31EE11------------------------
INT 31 - DOS32 v3.2+ - LOAD LIBRARY FILE
    AX = EE11h
    EDX -> near pointer of memory block to store library
Return: CF clear if successful
        EDX = near pointer to the dynamic library public
    CF set on error
Note:    must first successfuly call function AX=EE10h before calling this
      function
SeeAlso: AX=EE00h,AX=EE10h
--------E-31EE20------------------------
INT 31 - DOS32 v3.0+ - GET REAL MODE CALL BACK ADDRESS WITH RETF STACK FRAME
    AX = EE20h
    ESI = offset of the real mode call back function
Return: CF clear if successful
        CX:DX = real mode address to call up to the protected mode
          procedure
    CF set on error
SeeAlso: AX=EE00h,AX=EE02h,AX=EE21h
--------E-31EE21------------------------
INT 31 - DOS32 v3.0+ - GET REAL MODE CALL BACK ADDRESS WITH IRET STACK FRAME
    AX = EE21h
    ESI = offset of the real mode call back function
Return: CF clear if successful
        CX:DX = real mode address to call up to the protected mode
          procedure
    CF set on error
SeeAlso: AX=EE20h
--------E-31EE30------------------------
INT 31 - DOS32 v3.0+ - TERMINATE AND STAY RESIDENT
    AX = EE30h
SeeAlso: AX=EE21h,AX=EE40h,INT 21/AH=31h
--------E-31EE40------------------------
INT 31 - DOS32 v3.0+ - UNDO PREVIOUS MEMORY ALLOCATION or DMA BUFFER
    AX = EE40h
Return: CF clear if successful
    CF set on error
SeeAlso: AX=EE41h,AX=EE42h
--------E-31EE41------------------------
INT 31 - DOS32 v3.0+ - ALLOCATE 16KB DMA BLOCK
    AX = EE41h
Return: CF clear if successful
        EBX -> 16KB DMA block (physical address)
        EDX -> 16KB DMA block (offset address)
    CF set on error
SeeAlso: AX=EE40h,AX=EE42h
--------E-31EE42------------------------
INT 31 - DOS32 v3.0+ - ALLOCATE MEMORY BLOCK
    AX = EE42h
    EDX = size in bytes
Return: CF clear if successful
        EAX = size in bytes
        EDX -> memory block
    CF set on error
Note:    size is rounded off to the next 4KB boundary
SeeAlso: AX=EE40h,AX=EE41h
--------E-31FF00-----------------------------
INT 31 P - CauseWay - "Info" - GET SYSTEM SELECTORS/FLAGS
    AX = FF00h
Return: AX = selector for flag address space (base 00000000h, limit 4GB)
    BX = selector for current PSP segment (limit 0100h)
    (E)CX = size of DOS transfer buffer (max 64K)
    DX = real-mode segment address of DOS transfer buffer
    ES:(E)SI = protected-mode address of DOS transfer buffer
    EDI = system flags (see #2417)
Program: CauseWay is a 386 DOS extender by Michael Devore and John Wildsmith
      for use with Watcom C++ or assembly language programs
Notes:    the entire transfer buffer can be addressed with a 16-bit offset in
      protected mode
    CauseWay always maps selector 0040h to the BIOS data segment at
      real-mode segment 0040h; when not running under a DPMI host, CauseWay
      also provides selectors A000h, B000h, and B800h mapped to video
      memory
SeeAlso: AX=FF25h

Bitfields for CauseWay system flags:
Bit(s)    Description    (Table 2417)
 0    32-bit code
 1    virtual memory manage enabled
 3-2    mode: 00 raw extended memory, 01 VCPI, 10 DPMI
 4    DPMI available
 5    VCPI available
 6    no memory managers
 7    application descriptor table type: 0 = GDT, 1 = LDT
 14-8    reserved
 15    debugging engine present
--------E-31FF01-----------------------------
INT 31 P - CauseWay - "IntXX" - SIMULATE REAL-MODE INTERRUPT
    AX = FF01h
    BL = interrupt number
    ES:(E)DI -> real-mode register list (see #2403 at AX=0300h)
Return: register list updated
Note:    CauseWay fills in the values for SS, SP, and FLAGS itself, and ignores
      the values specified for CS and IP
SeeAlso: AX=0300h,AX=FF02h
--------E-31FF02-----------------------------
INT 31 P - CauseWay - "FarCallReal" - SIMULATE REAL-MODE FAR CALL
    AX = FF02h
    ES:(E)DI -> real-mode register list (see #2403 at AX=0300h)
Return: register list updated
SeeAlso: AX=0301h,AX=FF01h
--------E-31FF03-----------------------------
INT 31 P - CauseWay - "GetSel" - ALLOCATE NEW SELECTOR
    AX = FF03h
Return: CF clear if successful
        BX = new selector
    CF set on error
Note:    the new selector is initialized with a base address of 000000h, a limit
      of 0000h, and attributes read/write expand-up data
SeeAlso: AX=FF04h,AX=FF05h,AX=FF06h
--------E-31FF04-----------------------------
INT 31 P - CauseWay - "RelSel" - RELEASE A SELECTOR
    AX = FF04h
    BX = selector
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF03h,AX=FF06h
--------E-31FF05-----------------------------
INT 31 P - CauseWay - "CodeSel" - CONVERT SELECTOR TO EXECUTABLE CODE SELECTOR
    AX = FF05h
    BX = selector
    CL = default operation size (00h = 16-bit, 01h = 32-bit)
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF03h
--------E-31FF06-----------------------------
INT 31 P - CauseWay - "AliasSel" - CREATE READ/WRITE DATA ALIAS SELECTOR
    AX = FF06h
    BX = original selector
Return: CF clear if successful
        AX = new data selector aliasing original selector
    CF set on error
SeeAlso: AX=FF03h,AX=FF04h
--------E-31FF07-----------------------------
INT 31 P - CauseWay - "GetSelDet" - GET SELECTOR BASE AND LIMIT
    AX = FF07h
    BX = selector
Return: CF clear if successful
        CX:DX = base address
        SI:DI = limit (bytes)
    CF set on error
SeeAlso: AX=FF08h,AX=FF09h
--------E-31FF08-----------------------------
INT 31 P - CauseWay - "GetSelDet32" - GET SELECTOR BASE AND LIMIT (32-bit)
    AX = FF08h
Return: CF clear if successful
        EDX = base address
        ECX = limit (bytes)
    CF set on error
SeeAlso: AX=FF07h,AX=FF0Ah
--------E-31FF09-----------------------------
INT 31 P - CauseWay - "SetSelDet" - SET SELECTOR BASE AND LIMIT
    AX = FF09h
    BX = selector
    CX:DX = new base address
    SI:DI = new byte-granular limit
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF07h,AX=FF0Ah
--------E-31FF0A-----------------------------
INT 31 P - CauseWay - "SetSelDet32" - SET SELECTOR BASE AND LIMIT (32-bit)
    AX = FF0Ah
    BX = selector
    EDX = new base address
    ECX = new byte-granular limit
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF08h,AX=FF09h
--------E-31FF0B-----------------------------
INT 31 P - CauseWay - "GetMem" - ALLOCATE BLOCK OF MEMORY
    AX = FF0Bh
    CX:DX = size in bytes (FFFFh:FFFFh to get size of largest available)
Return: CF clear if successful
        BX = selector for accessing block if requested size not FFFFh:FFFFh
        CX:DX = size of largest available block if requested FFFFh:FFFFh
    CF set on error
SeeAlso: AX=FF0Ch,AX=FF0Dh,AX=FF0Fh,AX=FF10h,AX=FF2Ch
--------E-31FF0C-----------------------------
INT 31 P - CauseWay - "GetMem32" - ALLOCATE BLOCK OF MEMORY (32-bit)
    AX = FF0Ch
    ECX = size in bytes (FFFFFFFFh to get size of largest available block)
Return: CF clear if successful
        BX = selector for accessing block if requested size not FFFFh:FFFFh
        ECX = size of largest available block if requested FFFFh:FFFFh
    CF set on error
SeeAlso: AX=FF0Bh,AX=FF0Eh,AX=FF0Fh,AX=FF11h
--------E-31FF0D-----------------------------
INT 31 P - CauseWay - "ResMem" - RESIZE MEMORY BLOCK
    AX = FF0Dh
    BX = selector for block to be resized
    CX:DX = new size in bytes
Return: CF clear if successful
    CF set on error
Note:    the memory block may have to be copied to another location in order
      to satisfy the requested new size, in which case the base address
      of the selector is updated
SeeAlso: AX=FF0Bh,AX=FF0Eh,AX=FF12h
--------E-31FF0E-----------------------------
INT 31 P - CauseWay - "ResMem32" - RESIZE MEMORY BLOCK (32-bit)
    AX = FF0Eh
    BX = selector for block to be resized
    ECX = new size in bytes
Return: CF clear if successful
    CF set on error
Note:    the memory block may have to be copied to another location in order
      to satisfy the requested new size, in which case the base address
      of the selector is updated
SeeAlso: AX=FF0Ch,AX=FF0Dh,AX=FF13h
--------E-31FF0F-----------------------------
INT 31 P - CauseWay - "RelMem" - RELEASE PREVIOUSLY ALLOCATED MEMORY
    AX = FF0Fh
    BX = selector for block to be released
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF0Bh,AX=FF0Ch,AX=FF14h
--------E-31FF10-----------------------------
INT 31 P - CauseWay - "GetMemLinear" - ALLOCATE MEMORY WITHOUT SELECTOR
    AX = FF10h
    CX:DX = size of block in bytes
Return: CF clear if successful
        SI:DI = linear address of allocated block
    CF set on error
Note:    this function may return addresses above 16M
SeeAlso: AX=FF0Bh,AX=FF11h,AX=FF12h,AX=FF14h
--------E-31FF11-----------------------------
INT 31 P - CauseWay - "GetMemLinear32" - ALLOCATE MEMORY WITHOUT SELECTOR
    AX = FF11h
    ECX = size of block in bytes
Return: CF clear if successful
        ESI = linear address of allocated block
    CF set on error
Note:    this function may return addresses above 16M
SeeAlso: AX=FF0Ch,AX=FF10h,AX=FF13h,AX=FF14h
--------E-31FF12-----------------------------
INT 31 P - CauseWay - "ResMemLinear" - RESIZE LINEAR MEMORY BLOCK
    AX = FF12h
    CX:DX = new size in bytes
    SI:DI = linear address of block to be resized
Return: CF clear if successful
       SI:DI = new linear address of block
    CF set on error
SeeAlso: AX=FF0Dh,AX=FF10h,AX=FF13h
--------E-31FF13-----------------------------
INT 31 P - CauseWay - "ResMemLinear32" - RESIZE LINEAR MEMORY BLOCK (32-bit)
    AX = FF13h
    ECX = new size in bytes
    ESI = linear address of block to be resized
Return: CF clear if successful
       ESI = new linear address of block
    CF set on error
SeeAlso: AX=FF0Eh,AX=FF11h,AX=FF12h
--------E-31FF14-----------------------------
INT 31 P - CauseWay - "RelMemLinear" - RELEASE LINEAR MEMORY BLOCK
    AX = FF14h
    SI:DI = linear address of block to be released
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF0Fh,AX=FF10h,AX=FF15h
--------E-31FF15-----------------------------
INT 31 P - CauseWay - "RelMemLinear32" - RELEASE LINEAR MEMORY BLOCK (32-bit)
    AX = FF15h
    ESI = linear address of block to be released
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF0Fh,AX=FF11h,AX=FF15h
--------E-31FF16-----------------------------
INT 31 P - CauseWay - "GetMemNear" - ALLOCATE APPLICATION-RELATIVE MEMORY
    AX = FF16h
    EBX = size in bytes of block to allocate
Return: CF clear if successful
       ESI = application-relative linear address of allocated block
    CF set on error
SeeAlso: AX=FF17h,AX=FF18h,AX=FF19h
--------E-31FF17-----------------------------
INT 31 P - CauseWay - "ResMemNear" - RESIZE APPLICATION-RELATIVE MEMORY BLOCK
    AX = FF17h
    EBX = size in bytes of block to allocate
    ESI = application-relative linear address of block
Return: CF clear if successful
        ESI = new application-relative linear address of block
    CF set on error
SeeAlso: AX=FF16h,AX=FF18h,AX=FF19h
--------E-31FF18-----------------------------
INT 31 P - CauseWay - "RelMemNear" - RELEASE APPLICATION-RELATIVE MEMORY BLOCK
    AX = FF18h
    ESI = application-relative linear address of block
Return: CF clear if successful
    CF set on error
SeeAlso: AX=FF16h,AX=FF17h,AX=FF19h
--------E-31FF19-----------------------------
INT 31 P - CauseWay - "Linear2Near" - CONVERT LINEAR TO APP-RELATIVE ADDRESS
    AX = FF19h
    ESI = linear address
Return: ESI = application-relative linear address
SeeAlso: AX=FF1Ah
--------E-31FF1A-----------------------------
INT 31 P - CauseWay - "Near2Linear" - CONVERT APP-RELATIVE TO LINEAR ADDRESS
    AX = FF1Ah
    ESI = application-relative linear address
Return: ESI = linear address
SeeAlso: AX=FF19h
--------E-31FF1B-----------------------------
INT 31 P - CauseWay - "LockMem" - LOCK REGION OF MEMORY
    AX = FF1Bh
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    prevent memory from being swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be locked as well
SeeAlso: AX=FF1Ch,AX=FF1Dh
--------E-31FF1C-----------------------------
INT 31 P - CauseWay - "LockMem32" - LOCK REGION OF MEMORY (32-bit)
    AX = FF1Ch
    ESI = starting linear address
    ECX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    prevent memory from being swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be locked as well
SeeAlso: AX=FF1Bh,AX=FF1Eh,AX=FF1Fh
--------E-31FF1D-----------------------------
INT 31 P - CauseWay - "UnLockMem" - UNLOCK REGION OF MEMORY
    AX = FF1Dh
    BX:CX = starting linear address
    SI:DI = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    allow memory to be swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be unlocked as well
SeeAlso: AX=FF1Bh,AX=FF1Eh
--------E-31FF1E-----------------------------
INT 31 P - CauseWay - "UnLockMem32" - UNLOCK REGION OF MEMORY (32-bit)
    AX = FF1Eh
    ESI = starting linear address
    ECX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    allow memory to be swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be unlocked as well
SeeAlso: AX=FF1Ch,AX=FF1Dh,AX=FF20h
--------E-31FF1F-----------------------------
INT 31 P - CauseWay - "LockMemNear" - LOCK APPLICATION-RELATIVE MEMORY REGION
    AX = FF1Fh
    ESI = starting application-relative linear address
    EBX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    prevent memory from being swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be locked as well
SeeAlso: AX=FF1Ch,AX=FF20h
--------E-31FF20-----------------------------
INT 31 P - CauseWay - "UnLockMemNear" - UNLOCK APP-RELATIVE MEMORY REGION
    AX = FF20h
    ESI = starting application-relative linear address
    ECX = size of region in bytes
Return: CF clear if successful
    CF set on error
Desc:    allow memory to be swapped out by the virtual memory manager
Note:    locks are applied on 4K page boundaries, so memory above and below
      the specified region may be unlocked as well
SeeAlso: AX=FF1Eh,AX=FF1Fh
--------E-31FF21-----------------------------
INT 31 P - CauseWay - "GetMemDOS" - ALLOCATE CONVENTIONAL MEMORY
    AX = FF21h
    BX = number of paragraphs to allocate
Return: CF clear if successful
        AX = real-mode segment of allocated block
        DX = initial selector for block
    CF set on error
        AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h)
        BX = size of largest available block
Note:    if the requested size is greater than 64K, contiguous selectors will
      be allocated, one for each 64K; for 32-bit applications, the first
      selector's limit will be set to the size of the entire block, while
      that selector will have a limit of 64K for 16-bit applications.  All
      selectors after the first one have a limit of 64K except the final
      one
SeeAlso: AX=FF22h,AX=FF23h,INT 21/AH=48h
--------E-31FF22-----------------------------
INT 31 P - CauseWay - "ResMemDOS" - RESIZE CONVENTIONAL MEMORY BLOCK
    AX = FF22h
    BX = new size in paragraphs
    DX = initial selector for block
Return: CF clear if successful
    CF set on error
        AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h)
        BX = maximum number of paragraphs available
Note:    this function will also fail if the block is expanded past a 64K
      boundary and the next selector is already in use
SeeAlso: AX=FF21h,AX=FF23h,INT 21/AH=49h
--------E-31FF23-----------------------------
INT 31 P - CauseWay - "RelMemDOS" - RELEASE CONVENTIONAL MEMORY BLOCK
    AX = FF23h
    DX = initial selector for block
Return: CF clear if successful
    CF set on error
        AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h)
Note:    all descriptors allocated for the block are freed
SeeAlso: AX=FF21h,AX=FF22h,INT 21/AH=4Ah
--------E-31FF24-----------------------------
INT 31 P - CauseWay - "ExecOverlay" - LOAD AND OPTIONALLY EXECUTE APP CODE
    AX = FF24h
    EBX = flags
        bit 0: don't execute (overlay only)
        bit 1: don't preserve relocation information
    ES:EDX -> filename (see also #2418)
    FS:ESI -> commandline (ESI = 00000000h if no commandline)
    GS:EDI -> name (CW's /o option)
Return: CF clear if successful
        ---EBX bit 0 set---
        CX:EDX = program entry point (CS:EIP)
        SI = segment of PSP
        ---EBX bit 1 set---
        BX:EAX = initial SS:ESP
        EDI high word = base segment
        EDI low word = number of segments
        EBP = start of segment definitions
    CF set on error
        AX = error code
        0001h DOS file access error
        0002h not a CuaseWay 3P file
        0003h not enough memory
SeeAlso: AX=FF2Ah,INT 21/AH=4Bh

Format of CauseWay executable:
Offset    Size    Description    (Table 2418)
 00h  2 BYTEs    signature "3P"
 02h    DWORD    size of header data in bytes
 06h    DWORD    size of EXE image data in bytes
 0Ah    DWORD    number of bytes of program memory required
 0Eh    WORD    number of segment definitions (see #2420)
 10h    DWORD    number of relocation table entries
 14h    DWORD    offset of program entry point
 18h    WORD    segment list entry number for entry point's CS
 1Ah    DWORD    initial ESP
 1Eh    WORD    segment list entry number for initial SS
 20h    DWORD    control flags (see #2419)
 24h    DWORD    automatic stack size in bytes if ESP entry = 00000000h
 28h    BYTE    length of name (name follows program image)
 29h 23 BYTEs    reserved
SeeAlso: #0935,#0950 at INT 21/AH=4Bh

Bitfields for CauseWay executable control flags:
Bit(s)    Description    (Table 2419)
 0    16-bit interrupt stack frame
 7    descriptor table type (0 = GDT, 1 = LDT)
 14    16-bit default data size
 31    compressed EXE image
Note:    bits 0 and 14 should always be equal
SeeAlso: #2418

Format of CauseWay segment definition [array]:
Offset    Size    Description    (Table 2420)
 00h    DWORD    start offset within program image
 04h    DWORD    length and type
        bits 0-19: length
        bit 20:       granularity (if set, length is in 4K pages)
        bits 21-24: type
            0000 code
            0001 read/write data
            0010 stack
            0011 read-only data
        bit 25: force segment descriptor's D bit to 0
        bit 26: force segmetn descriptor's D bit to 1
SeeAlso: #2418
--------E-31FF25-----------------------------
INT 31 P - CauseWay - "GetDOSTrans" - GET DOS TRANSFER BUFFER
    AX = FF25h
Return: BX = real-mode segment of transfer buffer
    ECX = transfer buffer size
    DX = protected-mode selector for transfer buffer
Note:    the default buffer size of 8K is sufficient for most applications,
      but an application performing large amounts of file I/O may benefit
      from allocating its own, larger buffer
SeeAlso: AX=FF00h,AX=FF26h
--------E-31FF26-----------------------------
INT 31 P - CauseWay - "SetDOSTrans" - SET DOS TRANSFER BUFFER
    AX = FF26h
    BX = real-mode segment of new transfer buffer
    ECX = new transfer buffer size
    DX = protected-mode selector for new transfer buffer
Return: nothing
Note:    the specific buffer must be located in conventional memory; only the
      first 64K will be used
SeeAlso: AX=FF25h
--------E-31FF27-----------------------------
INT 31 P - CauseWay v1.3 - "GetMCBSize" - GET CURRENT MCB ALLOCATION BLOCK SIZE
    AX = FF27h
Return: ECX = current threshold
Desc:    determine the memory allocation size below which CauseWay will use
      internal MCB chains rather than allocating full 4K pages via DPMI
SeeAlso: AX=FF00h,AX=FF28h
--------E-31FF28-----------------------------
INT 31 P - CauseWay v1.3 - "SetMCBSize" - SET MCB MEMORY ALLOCATION BLOCK SIZE
    AX = FF28h
    ECX = new threshold (0000000h to disable MCB memory allocation system)
Return: CF clear if successful
        threshold unchanged (default 16K)
    CF set on error (threshold > 64K)
Desc:    specify the memory allocation size below which CauseWay will use
      internal MCB chains rather than allocating full 4K pages via DPMI
Note:    the specified threshold will be rounded up to the next higher multiple
      of 4K
SeeAlso: AX=FF00h,AX=FF27h
--------E-31FF29-----------------------------
INT 31 P - CauseWay v1.3 - "GetSels" - ALLOCATE MULTIPLE SELECTORS
    AX = FF29h
    CX = number of selectors to allocate
Return: BX = base selector
Desc:    allocate multiple contiguous selectors, initializing each to have a
      base address and limit of zero
SeeAlso: AX=FF00h,AX=FF04h
--------E-31FF2A-----------------------------
INT 31 P - CauseWay v1.3 - "cwLoad" - LOAD ANOTHER CAUSEWAY PROGRAM AS OVERLAY
    AX = FF2Ah
    DS:EDX -> filename
Return: CF clear if successful
        CX:EDX = CS:EIP of entry point
        BX:EAX = initial SS:ESP for program
        SI = PSP for overlay program
    CF set on error
        AX = error code (01h file error, 02h not a 3P file, 03h no memory)
Note:    the returned PSP can be given to "RelMem" (AX=FF0Fh) to release the
      overlay's memory and selectors; only selectors and memory allocated
      during loading will be freed by RelMem unless one switches PSPs with
      INT 21/AH=50h
SeeAlso: AX=FF00h,AX=FF24h
--------E-31FF2B-----------------------------
INT 31 P - CauseWay v1.3 - "cwcInfo" - VALIDATE AND GET SIZE OF CWC FILE
    AX = FF2Bh
    BX = file handle for CWC-compressed file
Return: CF clear if successful
        ECX = expanded file size
    CF set on error (not a CWC-compressed file)
SeeAlso: AX=FF00h,AX=FFFBh
--------E-31FF2C-----------------------------
INT 31 P - CauseWay v1.3 - "GetMemSO" - ALLOCATE MEMORY AND RETURN SEL:OFFSET
    AX = FF2Ch
    CX:DX = block size in bytes
Return: CF clear if successful
       SI:DI = selector:offset of allocated memory
    CF set on error
Note:    unlike "GetMem" (AX=FF0Bh), this function will reuse selectors until a
      segment is full, rather than allocating a new selector for each
      memory block
SeeAlso: AX=FF00h,AX=FF2Dh,AX=FF2Eh
--------E-31FF2D-----------------------------
INT 31 P - CauseWay v1.3 - "ResMemSO" - RESIZE SELECTOR:OFFSET MEMORY BLOCK
    AX = FF2Dh
    SI:DI = selector:offset for memory block
    CX:DX = new size of block
Return: CF clear if successful
       SI:DI = new selector:offset for memory block
    CF set on error
SeeAlso: AX=FF00h,AX=FF2Ch,AX=FF2Eh
--------E-31FF2E-----------------------------
INT 31 P - CauseWay v1.3 - "RelMemSO" - RELEASE SELECTOR:OFFSET MEMORY BLOCK
    AX = FF2Eh
    SI:DI = selector:offset for memory block
SeeAlso: AX=FF00h
--------E-31FFFB-----------------------------
INT 31 P - Causeway v1.3 - "cwcLoad" - LOAD/EXPAND CWC-COMPRESSED FILE
    AX = FFFBh
    BX = source file handle
    ES:EDI -> memory buffer into which to expand file
Return: CF clear if successful
        ECX = expanded data length
    CF set on error
        EAX = error code (01h file error, 02h bad data, 03h not CWC file)
Note:    the provided file may consist of the concatenation of several CWC
      files; the one beginning at the current file position will be
      expanded
SeeAlso: AX=FF2Bh
--------v-32---------------------------------
INT 32 - VIRUS - reportedly used by "Tiny" Viruses
SeeAlso: INT 21/AX=FFFFh"VIRUS",INT 31"VIRUS",INT 44"VIRUS"
--------v-32---------------------------------
INT 32 - VIRUS - "Plovdiv 1.3"/"Damage 1.3" - ORIGINAL INT 21h VECTOR
SeeAlso: INT 31"VIRUS",INT 9E"VIRUS"
--------y-326E-------------------------------
INT 32 - NOISE.SYS 0.53 - API
    AH = 6Eh (function ID)
    AL = subfunction (see INT 32/AX=6E00h)
Return: CF set on error
        AL = error code (see #2421)
    CF clear if successful
Notes:    INT 32 is only a proposed interface for NOISE.SYS. Use the IOCTL READ
      from the RANDOM device to determine the interrupt and function ID
      used by the driver, since future versions may use the Alternate
      Multiplex Interrupt (AMIS) at INT 2Dh.
    the beta v0.51 had a substantially different API on INT 32/AH=6Eh

(Table 2421)
Values for NOISE.SYS error codes:
 00h    subfunction not supported
 FBh    random pool is empty
 FCh    quality of sample is too low
 FDh    too many processes using the API or driver
 FEh    subfunction is disabled in the current build
 FFh    successful
--------y-326E00-----------------------------
INT 32 - NOISE.SYS v0.53+ - INSTALLATION CHECK
    AX = 6E00h
Return: AL = installation status
        00h not installed
        FFh installed
        CX = version (ie, 0123h = Version 1.2.3)
        DX:DI -> signature string
--------y-326E01-----------------------------
INT 32 - NOISE.SYS v0.53+ - GET ENTRY POINT
    AX = 6E01h
Return: AL = FFh
    DX:DI -> far call hook
----------326E04-----------------------------
INT 32 - NOISE.SYS v0.55+ - GET INTERRUPT HOOK LIST
    AX = 6E04h
Return: AL = status
        00h = unimplemented
        04h = DX:BX -> interrupt hook list
        FEh = subfunction disabled
Note:    the hook list array ends with API interrupt (usually 32h, although
      it will differ if the API is installed at another interrupt)
----------326E06-----------------------------
INT 32 - NOISE.SYS v0.55+ - GET DEVICE DRIVER HEADER
    AX = 6E06h
Return: AL = number of device drivers in NOISE.SYS chain
        02h = default (for RANDOM and URANDOM devices)
    AH = AMIS device driver flags (set to 00h for now)
    DX:BX -> first device in chain (see #0987)
SeeAlso: INT 2D/AL=06h
--------y-326E10-----------------------------
INT 32 - NOISE.SYS v0.53+ - STATUS CHECK
    AX = 6E10h
Return: CF set on error
        AL = error code (FDh) (see #2421)
    CF clear if successful
        AL = status
        FFh successful
        BH = number of processes using the API
        CX = number of random bytes waiting
        DX = maximum possible bytes waiting
        (if CX=DX, the pool is full)
Note:    this subfunction is a convenient way to check the driver if any
      fresh bytes are waiting in the output pool.
SeeAlso: INT 32/AH=6Eh,AX=6E00h,AX=6E11h
--------y-326E11-----------------------------
INT 32 - NOISE.SYS v0.53+ - GET ENTROPY ESTIMATE
    AX = 6E11h
Return: CF set on error
        AL = error code (00h,FDh,FEh) (see #2421)
    CF clear if successful
        EBX = estimated bit count (refer to note below)
        CL = FRACBITS (number of fractional bits)
        EDX = low 32-bits of total number of samples added
Note:  the estimated number of fresh random bits is equal to
      (EAX >> FRACBITS) + ((EAX & ((1 << FRACBITS)-1) / (1 << FRACBITS))
SeeAlso: AH=6Eh,AX=6E00h
--------y-326E12-----------------------------
INT 32 - NOISE.SYS v0.53+ - ADD SAMPLE FROM FAST TIMER
    AX = 6E12h
Return: CF set on error
        AL = error code (FCh,FDh,FEh) (see #2421)
    CF clear if successful
        CX = number of random bytes waiting
Note:    subfunctions 12h and 13h are meant for applications or devices
      which are able to gather entropy from other sources which are
      not polled by NOISE.SYS (for example, a communications driver
      could use this call to sample packet arrival times).
SeeAlso: AX=6E00h,AX=6E10h,AX=6E13h
--------y-326E13-----------------------------
INT 32 - NOISE.SYS v0.53+ - ADD 16-BIT SAMPLE TO RANDOM POOL
    AX = 6E13h
    DX = sample
Return: CF set on error
        AL = error code (FCh,FEh) (see #2421)
    CF clear if successful
        CX = number of random bytes waiting
SeeAlso: AX=6E00h,AX=6E11h
--------y-326E14-----------------------------
INT 32 - NOISE.SYS v0.53+ - GET FLAGS
    AX = 6E14h
Return: BX = flags (see #2422)
    CX = mask of settable flags in BX
SeeAlso: AX=6E00h,AX=6E15h

Bitfields for NOISE.SYS flags:
Bit(s)    Description    (Table 2422)
 0    MS Windows active
 1-5    reserved
 6    clock drift sampling
 7    video retrace drift sampling
 8    network access sampling (not implemented yet in 0.53)
 9    CD-ROM access sampling (not implemented yet in 0.53)
 10    DOS spinner
 11    DOS process start/end and miscellaneous process activity sampling
 12    mouse movement/button sampling
 13    disk sampling (INT 13)
 14    keystroke timings
 15    reserved for hardware RNG
--------y-326E15-----------------------------
INT 32 - NOISE.SYS v0.53+ - SET FLAGS
    AX = 6E15h
    BX = flags (see #2422)
Return: BX = new flags
Note:    flags which AX=6E14h indicates are not settable should be masked off
      by ANDing with the CX returned by AX=6E14h
SeeAlso: AX=6E00h,AX=6E14h
--------y-326E16-----------------------------
INT 32 - NOISE.SYS v0.53+ - READ URANDOM BYTES
    AX = 6E16h
    CX = number of bytes
    ES:DI -> buffer
Return: CF set on error
        AL = error code (FDh,FEh) (see #2421)
    CF clear if successful
        CX = number of random bytes read
SeeAlso: AX=6E00h,AX=6E12h,AX=6E17h
--------y-326E17-----------------------------
INT 32 - NOISE.SYS v0.53+ - READ RANDOM BYTES
    AX = 6E17h
    CX = number of bytes
    ES:DI -> buffer
Return: CF set on error
        AL = error code (FBh,FDh,FEh) (see #2421)
    CF clear if successful
        CX = number of random bytes read
SeeAlso: AX=6E00h,AX=6E16h
----------326E18-----------------------------
INT 32 - NOISE.SYS v0.6+ - READ CONTROL RECORD
    AX = 6E18h
    CX = buffer size
    ES:DI -> buffer
Return: AL = status
        00h unimplemented (before v0.6)
        FEh subfunction is disabled
        FFh successful
        CX = number of bytes read
Note:    the control record corresponds to the IOCTL Read record for the RANDOM
      device
----------326E-------------------------------
INT 32 - NOISE.SYS - RESERVED FOR FUTURE USE
    AH = 6Eh
    AL = 19h to 3Fh
Return: AL = 00h
Note:    these functions are reserved for future use; user additions to the
      the driver should use subfunctions 40h to FFh.
--------!---Section--------------------------