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Text File | 1996-10-20 | 362KB | 9,468 lines

Interrupt List, part 9 of 15 Copyright (c) 1989,1990,1991,1992,1993,1994,1995,1996 Ralf Brown --------D-21FF------------------------------- INT 21 - DOS v2.11-2.13 - OEM FUNCTION AH = FFh Return: AL = 00h if no OEM function handler installed (see AH=F8h"OEM") SeeAlso: AH=F8h"OEM",AH=FEh"OEM" --------K-21FF------------------------------- INT 21 - CED (Command EDitor) - INSTALLABLE COMMANDS AH = FFh AL = subfunction 00h add installable command BL = mode bit 0 = 1 callable from DOS prompt bit 1 = 1 callable from application DS:SI -> CR-terminated command name ES:DI -> FAR routine entry point 01h remove installable command DS:SI -> CR-terminated command name 02h reserved, may be used to test for CED installation Return: CF clear if successful CF set on error AX = error code 01h invalid function 02h command not found (subfunction 01h only) 08h insufficient memory (subfunction 00h only) 0Eh bad data (subfunction 00h only) AH = FFh if CED not installed Program: CED is a shareware DOS command-line enhancer by Christopher J. Dunford SeeAlso: AX=0A00h --------E-21FF------------------------------- INT 21 - DJ GO32.EXE 80386+ DOS extender - DOS EXTENSIONS AH = FFh AL = function 01h create file 02h open file 03h get file statistics 04h get time of day 05h set time of day 06h stat 07h system Program: GO32.EXE is a DOS extender included as part of the 80386 port of the GNU C/C++ compiler by DJ Delorie and distributed as DJGPP SeeAlso: INT 10/AH=FFh"GO32" --------K-21FF------------------------------- INT 21 - DOSED.COM - INSTALLATION CHECK AH = FFh DS:SI -> "DOSED" ES = 0000h Return: ES:DI -> "DOSED" if installed Program: DOSED is a free DOS commandline editor/history buffer by Sverre H. Huseby --------v-21FF------------------------------- INT 21 - VIRUS - "Sunday", "Tumen 0.5", "Hero" - INSTALLATION CHECK AH = FFh Return: AH = 00h if "Tumen 0.5" or "Hero" resident AX = 0400h if "Sunday" resident SeeAlso: AX=FEDCh"VIRUS",AX=FF01h"VIRUS" --------E-21FF------------------------------- INT 21 UP - Rational Systems DOS/4GW - API AH = FFh DH = function (00h-17h) (also see separate entries below) DL = subfunction or argument Return: CF clear if valid function number AX = status??? CF set if invalid function SeeAlso: INT 15/AX=BFDCh --------E-21FF--DH00------------------------- INT 21 UP - Rational Systems DOS/4GW - GET VERSION??? AH = FFh DH = 00h DL = ??? (78h seen) Return: CF clear EAX = 4734FFFFh (high word is byte-swapped "4G") if DOS/4G installed Note: Quarterdeck's DESQview/X X Toolkit library uses this call to determine whether the direct-mapped linear 4GB segment's selector is 34h or 38h SeeAlso: INT 21/AH=FFh/DH=00h"DOS/4GW" --------E-21FF--DH02------------------------- INT 21 UP - Rational Systems DOS/4GW - SET ??? AH = FFh DH = 02h DL = ??? Return: CF clear --------E-21FF--DH05------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 05h BX = ??? Return: ??? --------E-21FF--DH06------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 06h BX = ??? Return: ??? --------E-21FF--DH07------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 07h BX = ??? Return: ??? --------E-21FF--DH08------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 08h BX = ??? CX = ??? ES = ??? Return: ??? --------E-21FF--DH09------------------------- INT 21 UP - Rational Systems DOS/4GW - GET ??? AH = FFh DH = 09h Return: ES:BX -> ??? --------E-21FF--DH0A------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 0Ah AL = ??? BX = ??? CX = ??? Return: ES = ??? or 0000h --------E-21FF--DH0B------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 0Bh AL = ??? BX = ??? CX = ??? Return: ??? --------E-21FF--DH0C------------------------- INT 21 UP - Rational Systems DOS/4GW - GET/SET ??? AH = FFh DH = 0Ch DL = ??? (00h or 01h) Return: CF clear if successful AL = previous value of ??? CF set on error (DL out of range) AX = FFFFh --------E-21FF--DH0D------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 0Dh ??? Return: ??? --------E-21FF--DH0E------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 0Eh Return: DX:AX -> XBRK structure (see #0410 at INT 15/AX=BF02h) BX = ??? CX = ??? SeeAlso: INT 15/AX=BF02h --------E-21FF--DH0F------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 0Fh ??? Return: ??? --------E-21FF--DH10------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 10h AL = ??? BX = ??? CX = ??? DI = ??? SI = ??? Return: ??? Note: among other things, frees two memory blocks via INT 21/AH=49h --------E-21FF--DH11------------------------- INT 21 UP - Rational Systems DOS/4GW - NOP AH = FFh DH = 11h --------E-21FF--DH12------------------------- INT 21 UP - Rational Systems DOS/4GW - EXCHANGE ??? POINTERS AH = FFh DH = 12h DS:SI -> new ??? ES:DI -> new ??? Return: DS:SI -> previous ??? ES:DI -> previous ??? --------E-21FF--DH13------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 13h AL = ??? ES = ??? Return: ??? --------E-21FF--DH14------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 14h BX = ??? CX = ??? Return: CF clear AX = ??? DX = ??? --------E-21FF--DH15------------------------- INT 21 UP - Rational Systems DOS/4GW - GET ??? FUNCTIONS AH = FFh DH = 15h Return: CF clear DX:AX -> FAR function for ??? CX:BX -> FAR function for ??? SI:DI -> FAR function for ??? --------E-21FF--DH16------------------------- INT 21 UP - Rational Systems DOS/4GW - GET ??? AH = FFh DH = 16h Return: AX = ??? --------E-21FF--DH17------------------------- INT 21 UP - Rational Systems DOS/4GW - ??? AH = FFh DH = 17h AL = ??? DL = ??? Return: ??? --------N-21FF00----------------------------- INT 21 - TopWare Network OS v5.10+ - GET SYSTEM INFORMATION AX = FF00h CL = what to get 00h user information (see #1864) 01h drive mapping (see #1865) 02h printer server(s) 05h local DOS drive number Return: ES:BX -> desired information Program: TopWare Network Operating System is manufactured by Grand Computer Company Note: this call is only supported on Workstations, not on the server SeeAlso: AX=FF04h,INT 2F/AX=FF00h Format of TopWare user information: Offset Size Description (Table 1864) 00h BYTE node ID 01h 15 BYTEs user name 10h WORD user number 12h BYTE group number Format of TopWare drive mapping [array]: Offset Size Description (Table 1865) 00h BYTE bits 6-0: drive number (1=A:, etc.) bit 7: this is a server drive 01h 3 BYTEs mapping drive (for example, "C:\") 04h 64 BYTEs current directory --------E-21FF00DX0078----------------------- INT 21 - Rational Systems DOS/4G - INSTALLATION CHECK AX = FF00h DX = 0078h Return: AL <> 00h if installed GS = segment of kernel if nonzero SeeAlso: INT 15/AX=BF02h --------v-21FF01----------------------------- INT 21 - VIRUS - "Drop" - INSTALLATION CHECK AX = FF01h Return: AX = 01FFh if resident SeeAlso: AH=FEh"VIRUS",AX=FF0Fh"FLU_SHOT" --------N-21FF04----------------------------- INT 21 - TopWare Network OS v5.10+ - GET/SET DEFAULT FILE PROTECTION ATTRIBS AX = FF04h CL = function 00h get protections Return: BH = read attribute BL = write attribute 01h set protections BH = read attribute BL = write attribute Note: this function is supported only on Workstations, not on the server SeeAlso: AX=FF00h"TopWare" --------v-21FF0F----------------------------- INT 21 - FLU_SHOT+ v1.83 - INSTALLATION CHECK AX = FF0Fh Return: AX = 0101h if resident Program: FLU_SHOT+ is an antivirus/antitrojan program by Ross M. Greenberg and Software Concepts Design Note: the "PSQR/1720" virus calls this function to determine whether FLU_SHOT+ is present SeeAlso: AH=FFh"VIRUS",AX=FF10h"VIRUS" --------v-21FF10----------------------------- INT 21 - VIRUS - "Twins" - INSTALLATION CHECK AX = FF10h Return: AL = 07h if resident SeeAlso: AX=FF0Fh,AX=FFFEh --------N-21FF80DHFF------------------------- INT 21 - TopWare Network OS v5.10+ - SEND MESSAGE AX = FF80h DH = FFh DL = destination address (FFh for broadcast) CX = message length (max 2000) DS:SI -> message to be sent (see #1866) Return: nothing Program: TopWare Network Operating System is manufactured by Grand Computer Company Notes: this function is supported on both Workstations and the server there is no guarantee that the message will be received correctly, or at all, by the destination Format of TopWare message: Offset Size Description (Table 1866) 00h BYTE type code 07h TopSend 11h user application other reserved for TopWare 01h var data Note: sending messages with a type code other than 11h will cause unpredictable results --------N-21FF82----------------------------- INT 21 - TopWare Network OS v5.10+ - GET STATION ADDRESS AX = FF82h Return: AL = station address Note: this function is supported on both Workstations and the server SeeAlso: AX=FF91h --------N-21FF8C----------------------------- INT 21 - TopWare Network OS v5.10+ - GET STATUS OF TopShow/Emulated FUNCTION AX = FF8Ch BL = subfunction 00h get TopShow status FFh get Emulated status Return: AL = status 00h not installed 01h already installed --------N-21FF8D----------------------------- INT 21 - TopWare Network OS v5.10+ - CALL TopShow FUNCTION AX = FF8Dh CH = monochrome flag (01h monochrome, 00h not monochrome) CL = screen mode of station to be viewed (see #1867) BL = graphic page number for monochrome Return: AL = status (00h successful, else failed) SeeAlso: AX=FF8Eh,AX=FFCFh (Table 1867) Values for TopWare screen mode: 00h text mode 01h 720x348 02h 640x408 03h 720x352 04h 640x390 05h reserved --------N-21FF8E----------------------------- INT 21 - TopWare Network OS v5.10+ - CANCEL TopShow FUNCTION AX = FF8Eh Return: AL = 00h (successful, TopShow removed) SeeAlso: AX=FF8Dh --------N-21FF91----------------------------- INT 21 - TopWare Network OS v5.10+ - GET FILE SERVER STATION NUMBER AX = FF91h Return: AL = station number of file server SeeAlso: AX=FF82h --------N-21FF97----------------------------- INT 21 - TopWare Network OS v5.10+ - GET MAXIMUM STATION NUMBER (server only) AX = FF97h Return: AL = maximum station number SeeAlso: AX=FF98h --------N-21FF98----------------------------- INT 21 - TopWare Network OS v5.10+ - GET MAXIMUM FILE NUMBER (server only) AX = FF98h Return: AL = maximum file SeeAlso: AX=FF97h --------N-21FF9A----------------------------- INT 21 - TopWare Network OS v5.10+ - RECEIVE OF USER-DEFINED PACKETS AX = FF9Ah ES:BX -> buffer for user-defined packet (see #1868) Return: nothing Format of TopWare user-defined packet: Offset Size Description (Table 1868) 00h BYTE FFh 01h WORD (call) length of data field plus 3 (ret) length of received message (0000h if none received) 03h BYTE destination ID (FFh for broadcast message) 04h BYTE sending station ID 05h BYTE type code (11h; all other codes reserved for TopWare) 06h N BYTEs received message --------N-21FF9F----------------------------- INT 21 - TopWare Network OS v5.10+ - ENABLE/DISABLE TopTerm SERVICE AX = FF9Fh CL = new state (00h disable [disregard TopTerm packets], 01h enable) Return: AL = status (00h successful, FFh failed) Note: this function is only supported by Workstations, not the server --------N-21FFB0----------------------------- INT 21 - TopWare Network OS v5.10+ - GET SPOOLER PRINTING PRIORITY AX = FFB0h Return: AL = priority status (see #1869) SeeAlso: AX=FFB1h Bitfields for TopWare printer priority status: Bit(s) Description (Table 1869) 2 LPT3 has high priority 1 LPT2 has high priority 0 LPT1 has high priority --------N-21FFB1----------------------------- INT 21 - TopWare Network OS v5.10+ - SET SPOOLER PRINTING PRIORITY AX = FFB1h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CH = new priority (00h normal, 01h high) Return: nothing SeeAlso: AX=FFB0h --------N-21FFB3----------------------------- INT 21 - TopWare Network OS v5.10+ - GET DEFAULT START-OF-JOB FORMFEED STATUS AX = FFB3h Return: AL = starting formfeed status (see #1870) SeeAlso: AX=FFB4h,AX=FFC0h Bitfields for TopWare printer start-of-job formfeed status: Bit(s) Description (Table 1870) 2 LPT3 has formfeed enabled 1 LPT2 has formfeed enabled 0 LPT1 has formfeed enabled --------N-21FFB4----------------------------- INT 21 - TopWare Network OS v5.10+ - SET DEFAULT START-OF-JOB FORMFEED STATUS AX = FFB4h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CH = new formfeed status (00h off, 01h on) Return: nothing SeeAlso: AX=FFB3h,AX=FFC1h --------N-21FFBB----------------------------- INT 21 - TopWare Network OS v5.10+ - GET PRINTER SERVER STATION ADDRESS AX = FFBBh CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) Return: AL = current mapping printer server station number 00h if local SeeAlso: AX=FFBCh --------N-21FFBC----------------------------- INT 21 - TopWare Network OS v5.10+ - CANCEL TopShow FUNCTION AX = FFBCh CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CL = printer server station address or 00h for local printer Return: AL = status (00h successful, else failed) SeeAlso: AX=FFBBh --------N-21FFBD----------------------------- INT 21 - TopWare Network OS v5.10+ - GET CURRENT AUTOPRINT TIME AX = FFBDh CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) Return: AX = current AutoPrint timeout in clock ticks SeeAlso: AX=FFBEh --------N-21FFBE----------------------------- INT 21 - TopWare Network OS v5.10+ - SET AUTOPRINT TIME AX = FFBEh CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) BX = timeout in clock ticks SeeAlso: AX=FFBDh --------N-21FFBF----------------------------- INT 21 - TopWare Network OS v5.10+ - GET LOGON USER INFORMATION AX = FFBFh DX:BX -> buffer for logon information (see #1871) Return: AL = status (00h successful, else failed) AH = number of logged-in stations Format of TopWare logon information: Offset Size Description (Table 1871) 00h BYTE station address 01h 15 BYTEs username --------N-21FFC0----------------------------- INT 21 - TopWare Network OS v5.10+ - GET DEFAULT END-OF-JOB FORMFEED STATUS AX = FFC0h Return: AL = ending formfeed status (see #1872) SeeAlso: AX=FFB3h,AX=FFC1h Bitfields for TopWare printer end-of-job formfeed status: Bit(s) Description (Table 1872) 2 LPT3 has formfeed enabled 1 LPT2 has formfeed enabled 0 LPT1 has formfeed enabled --------N-21FFC1----------------------------- INT 21 - TopWare Network OS v5.10+ - SET DEFAULT END-OF-JOB FORMFEED STATUS AX = FFC1h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CH = new formfeed status (00h off, 01h on) Return: nothing SeeAlso: AX=FFB4h,AX=FFC0h --------N-21FFC2----------------------------- INT 21 - TopWare Network OS v5.10+ - GET DEFAULT COPIES OF SPOOLING FILE AX = FFC2h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) Return: AL = default number of copies printed SeeAlso: AX=FFC7h --------N-21FFC3----------------------------- INT 21 - TopWare Network OS v5.10+ - GET SHARING STATUS OF PRINTER SERVER AX = FFC3h Return: AL = sharing status of printers (see #1873) FFh if not a printer server Bitfields for TopWare printer sharing status: Bit(s) Description (Table 1873) 2 LPT3 is shared 1 LPT2 is shared 0 LPT1 is shared --------N-21FFC4----------------------------- INT 21 - TopWare Network OS v5.10+ - GET/SET LPT PORT ON PRINT SERVER AX = FFC4h BL = subfunction 00h get Return: AL = mapped printer port on print server 01h set CL = network printer port (00h LPT1, 01h LPT2, 02h LPT3) CH = local printer (00h LPT1, 01h LPT2, 02h LPT3) --------N-21FFC6----------------------------- INT 21 - TopWare Network OS v5.10+ - SET DEFAULT PRINT FILE HEADER AX = FFC6h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CL = header state (00h off, 01h on) SeeAlso: AX=FFC8h --------N-21FFC7----------------------------- INT 21 - TopWare Network OS v5.10+ - SET DEFAULT PRINT COPIES AX = FFC7h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CL = new default number of copies to print SeeAlso: AX=FFC2h --------N-21FFC8----------------------------- INT 21 - TopWare Network OS v5.10+ - GET DEFAULT PRINT FILE HEADER STATUS AX = FFC8h Return: AL = header status for printers (see #1874) SeeAlso: AX=FFC6h Bitfields for TopWare print header status: Bit(s) Description (Table 1874) 2 LPT3 has headers enabled 1 LPT2 has headers enabled 0 LPT1 has headers enabled --------N-21FFC9----------------------------- INT 21 - TopWare Network OS v5.10+ - SET PRINTER SHARING AX = FFC9h CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CL = new sharing state (00h off, 01h on) Return: AL = status (00h successful, FFh not printer server) --------N-21FFCA----------------------------- INT 21 - TopWare Network OS v5.10+ - MOVE FILE FROM ONE PRINT SERVER TO ANOTHER AX = FFCAh CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CL = original printer server station address BL = target printer server station address DS:DX -> filename (12 bytes) Return: AL = status (00h successful, else failed) SeeAlso: AX=FFCBh --------N-21FFCB----------------------------- INT 21 - TopWare Network OS v5.10+ - DELETE FILE FROM SPOOLING QUEUE AX = FFCBh CH = printer number (00h LPT1, 01h LPT2, 02h LPT3) CL = printer server station address DS:DX -> filename (12 bytes) Return: AL = status (00h successful, else failed) SeeAlso: AX=FFCAh --------N-21FFCC----------------------------- INT 21 - TopWare Network OS v5.10+ - GET PRINT SERVER'S SPOOLING QUEUE STATUS AX = FFCCh CL = printer server station address BH = start item number of spooling file for print server BL = number of the item to be retrieved DS:DX -> buffer for queued file information (see #1875) Return: AL = status 00h successful AH = number of spool files DS:DX buffer filled nonzero failed Format of TopWare queued file information buffer [16-item array, one element]: Offset Size Description (Table 1875) 00h 12 BYTEs filename 0Ch DWORD size 10h WORD date 12h WORD time 14h 15 BYTEs username 23h BYTE count 24h BYTE flag: header 25h BYTE print number --------N-21FFCD----------------------------- INT 21 - TopWare Network OS v5.10+ - GET STATUS OF ALL PRINT SERVERS AX = FFCDh DS:DX -> buffer for server status (see #1876) Return: AL = status 00h successful AH = number of print servers nonzero failed Format of TopWare server status: Offset Size Description (Table 1876) 00h BYTE station address 01h 15 BYTEs username 10h BYTE flag: 01h printer is shared, 00h sharing disabled 11h BYTE number of files pending in queue --------N-21FFCF----------------------------- INT 21 - TopWare Network OS v5.10+ - CALL TopLook FUNCTION AX = FFCFh DH = page number (0-2, 2 is text mode) DL = type 00h look at specific screen 01h AutoLook on FFh AutoLook off BH = station number wishing to look BL = station number to be looked at CH = monochrome flag (01h monochrome, 00h not monochrome) CL = screen mode (see #1867) Return: AL = status (00h successful, nonzero failed) SeeAlso: AX=FF8Dh --------N-21FFD6----------------------------- INT 21 - TopWare Network OS v5.10+ - GET KEYCARD SERIAL NUMBER AND MAX USERS AX = FFD6h ES:BX -> 12-byte buffer for keycard serial number Return: CX = maximum number of users ES:BX buffer filled --------N-21FFD7----------------------------- INT 21 - TopWare Network OS v5.10+ - GET NETWORK PROTECTION ATTRIBUTES STATUS AX = FFD7h Return: AL = status (00h disabled, 01h enabled) --------N-21FFE3DL00------------------------- INT 21 - TopWare Network OS v5.10+ - INITIATE ACCESS TO SPECIFIC PACKET TYPE AX = FFE3h DL = 00h BX = packet type for Ethernet header (IP = 0800h, ARP = 0806h, etc.) ES:DI -> receive routine (see #1878) Return: CF clear if successful AX = handle number CF set on error DH = error code (03h,05h,09h,0Ah,11h) (see #1877) SeeAlso: AX=FFE3h/DL=01h (Table 1877) Values for TopWare error code: 01h invalid handle 03h no interfaces of the specified type found 05h bad packet type 09h insufficient space 0Ah type already being accessed 0Ch unable to send packet (usually hardware error) 11h invalid function (Table 1878) Values TopWare receive routine is called with: AX = function 0000h request packet buffer CX = packet size Return: ES:DI -> buffer or 0000h:0000h to discard packet 0001h packet copied CX = packet size DS:SI -> copied packet (same as returned ES:DI above) --------N-21FFE3DL01------------------------- INT 21 - TopWare Network OS v5.10+ - END ACCESS TO SPECIFIC PACKET TYPE AX = FFE3h DL = 01h BX = handle returned by AX=FFE3h/DL=00h Return: CF clear if successful CF set on error DH = error code (01h,11h) (see #1877) Note: the specified access handle will no longer be valid after this call SeeAlso: AX=FFE3h/DL=00h --------N-21FFE3DL02------------------------- INT 21 - TopWare Network OS v5.10+ - SEND PACKET AX = FFE3h DL = 02h CX = length of data buffer DS:SI -> buffer containing data Return: CF clear if successful CF set on error DH = error code (0Ch,11h) (see #1877) --------N-21FFE3DL03------------------------- INT 21 - TopWare Network OS v5.10+ - GET LOCAL NETWORK INTERFACE ADDRESS AX = FFE3h DL = 03h ES:DI -> 6-byte buffer for address SeeAlso: AX=FFE3h/DL=00h --------v-21FFFE----------------------------- INT 21 - VIRUS - "08/15"/"Many Fingers" - INSTALLATION CHECK AX = FFFEh Return: AX = 0815h if resident SeeAlso: AX=FF10h,AX=FFFEh/BX=0000h --------v-21FFFEBX0000----------------------- INT 21 - VIRUS - "Anti-Thunderbyte/LEMMING" - INSTALLATION CHECK AX = FFFEh BX = 0000h Return: BX = FFFFh if resident SeeAlso: AX=FFFEh,AX=FFFFh --------v-21FFFF----------------------------- INT 21 - VIRUS - "Ontario", "Year 1992"/"B1M92" - INSTALLATION CHECK AX = FFFFh Return: AX = 0000h if "Ontario" resident AX = 1992h if "Year 1992"/"B1M92" resident SeeAlso: AX=FF0Fh,AX=FFFFh/CX=0000h,INT 6B"VIRUS" --------v-21FFFFCX0000----------------------- INT 21 - VIRUS - "Revenge" - INSTALLATION CHECK AX = FFFFh CX = 0000h Return: CX = 0006h if resident SeeAlso: AX=FFFFh,INT 6B"VIRUS" --------D-22--------------------------------- INT 22 - DOS 1+ - PROGRAM TERMINATION ADDRESS Desc: this vector specifies the address of the routine which is to be given control after a program is terminated; it should never be called directly, since it does not point at an interrupt handler Notes: this vector is restored from the DWORD at offset 0Ah in the PSP during termination, and then a FAR JMP is performed to the address in INT 22 normally points at the instruction immediately following INT 21/AH=4Bh call which loaded the current program SeeAlso: INT 20,INT 21/AH=00h,INT 21/AH=31h,INT 21/AH=4Ch --------G-22--------------------------------- INT 22 - COMTROL HOSTESS i/ISA DEBUGGER - CHANGE FIRMWARE DEBUGGING PORT AL = new firmware debugging port Return: ??? SeeAlso: INT 21"COMTROL",INT 23"COMTROL" --------D-23--------------------------------- INT 23 - DOS 1+ - CONTROL-C/CONTROL-BREAK HANDLER ---DOS 1.x--- Return: AH = 00h abort program if all registers preserved, restart DOS call ---DOS 2+--- CF clear Return: all registers preserved return via RETF with CF set or (MS-DOS 1,DR DOS) RETF 2 with CF set DOS will abort program with errorlevel 0 else (RETF/RETF 2 with CF clear or IRET with CF ignored) interrupted DOS call is restarted Notes: this interrupt is invoked whenever DOS detects a ^C or ^Break; it should never be called directly MS-DOS 1.25 also invokes INT 23 on a divide overflow (INT 00) MS-DOS remembers the stack pointer before calling INT 23, and if it is not the same on return, pops and discards the top word; this is what permits a return with RETF as well as IRET or RETF 2 MS-DOS 2.1+ ignores the returned CF if SP is the same on return as it was when DOS called INT 23, so RETF 2 will not terminate the program Novell DOS 7 always pops a word if CF is set on return, so one should not return with RETF 2 and CF set or IRET with the stored flags' CF set any DOS call may safely be made within the INT 23 handler, although the handler must check for a recursive invocation if it does call DOS SeeAlso: INT 1B --------G-23--------------------------------- INT 23 - COMTROL HOSTESS i/ISA DEBUGGER - GET CONFIGURATION INFORMATION AL = query type 00h get old config map Return: AX = old config map 01h get dual-ported RAM map Return: BX:AX = dual-ported RAM map 02h get SCC port map Return: BX:AX = SCC port map SeeAlso: INT 22"COMTROL",INT 26"COMTROL" --------D-24--------------------------------- INT 24 C - DOS 1+ - CRITICAL ERROR HANDLER Notes: invoked when a critical (usually hardware) error is encountered by DOS (see #1879); should never be called directly when DOS terminates a program, it copies the previous value of the INT 24 vector out of the PSP (see #0725) and into the interrupt vector table SeeAlso: INT 21/AH=95h (Table 1879) Values critical error handler is called with: AH = type and processing flags (see #1880) AL = drive number if AH bit 7 clear BP:SI -> device driver header (see #0987 at INT 21/AH=52h) (BP:[SI+4] bit 15 set if character device) DI low byte contains error code if AH bit 7 set (see #1881) STACK: DWORD return address for INT 24 call WORD flags pushed by INT 24 WORD original AX on entry to INT 21 WORD BX WORD CX WORD DX WORD SI WORD DI WORD BP WORD DS WORD ES DWORD return address for INT 21 call WORD flags pushed by INT 21 Return: AL = action code (see #1882) SS,SP,DS,ES,BX,CX,DX preserved Notes: the only DOS calls the handler may make are INT 21/AH=01h-0Ch,30h,59h if the handler returns to the application by popping the stack, DOS will be in an unstable state until the first call with AH > 0Ch for DOS 3.1+, IGNORE (AL=00h) is turned into FAIL (AL=03h) on network critical errors if IGNORE specified but not allowed, it is turned into FAIL if RETRY specified but not allowed, it is turned into FAIL if FAIL specified but not allowed, it is turned into ABORT (DOS 3.0+) if a critical error occurs inside the critical error handler, the DOS call is automatically failed (AL set to 03h and the INT 24 call skipped) Bitfields for critical error type and processing flags: Bit(s) Description (Table 1880) 7 clear = disk I/O error set = -- if block device, bad FAT image in memory -- if char device, error code in DI 6 unused 5 Ignore allowed (DOS 3.0+) 4 Retry allowed (DOS 3.0+) 3 Fail allowed (DOS 3.0+) 2-1 disk area of error 00 = DOS area 01 = FAT 10 = root dir 11 = data area 0 set if write, clear if read (Table 1881) Values for critical error code: 00h write-protection violation attempted 01h unknown unit for driver 02h drive not ready 03h unknown command given to driver 04h data error (bad CRC) 05h bad device driver request structure length 06h seek error 07h unknown media type 08h sector not found 09h printer out of paper 0Ah write fault 0Bh read fault 0Ch general failure 0Dh (DOS 3.0+) sharing violation 0Eh (DOS 3.0+) lock violation 0Fh invalid disk change 10h (DOS 3.0+) FCB unavailable 11h (DOS 3.0+) sharing buffer overflow 12h (DOS 4.0+) code page mismatch 13h (DOS 4.0+) out of input 14h (DOS 4.0+) insufficient disk space (Table 1882) Values for critical error handler action code: 00h ignore error and continue processing request 01h retry operation 02h terminate program as though INT 21/AH=4Ch called (INT 20h for DOS 1.x) 03h fail system call in progress (DOS 3+) --------D-25--------------------------------- INT 25 - DOS 1+ - ABSOLUTE DISK READ (except partitions > 32M) AL = drive number (00h = A:, 01h = B:, etc) CX = number of sectors to read (not FFFFh) DX = starting logical sector number (0000h - highest sector on drive) DS:BX -> buffer for data Return: CF clear if successful CF set on error AH = status (see #1883) AL = error code (same as passed to INT 24 in DI) may destroy all other registers except segment registers Notes: original flags are left on stack, and must be popped by caller this call bypasses the DOS filesystem examination of CPWIN386.CPL indicates that if this call fails with error 0408h on an old-style (<32M) call, one should retry the call with the high bit of the drive number in AL set Novell DOS 7 decides whether the old-style or new-style (>32M) version of INT 25 must be used solely on the basis of the partition's size, thus forcing use of the new-style call even for data in the first 32M of the partition BUGS: DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an invalid drive number DR DOS 3.41 will return with a jump instead of RETF, leaving the wrong number of bytes on the stack; use the huge-partition version (INT 25/CX=FFFFh) for all partition sizes under DR DOS 3.41 SeeAlso: INT 13/AH=02h,INT 25/CX=FFFFh,INT 26,INT 21/AX=7305h (Table 1883) Values for disk I/O status: 80h device failed to respond (timeout) 40h seek operation failed 20h controller failed 10h data error (bad CRC) 08h DMA failure 04h requested sector not found 03h write-protected disk (INT 26 only) 02h bad address mark 01h bad command --------D-25----CXFFFF----------------------- INT 25 - DOS 3.31+ - ABSOLUTE DISK READ (>32M hard-disk partition) CX = FFFFh AL = drive number (0=A, 1=B, etc) DS:BX -> disk read packet (see #1884) Return: CF clear if successful CF set on error AH = status (see #1883) AL = error code (same as passed to INT 24 in DI) may destroy all other registers except segment registers Notes: partition is potentially >32M (and requires this form of the call) if bit 1 of the device attribute word in the device driver is set original flags are left on stack, and must be removed by caller this call bypasses the DOS filesystem SeeAlso: INT 13/AH=02h,INT 25,INT 26/CX=FFFFh,INT 21/AX=7305h Format of disk read packet: Offset Size Description (Table 1884) 00h DWORD sector number 04h WORD number of sectors to read 06h DWORD transfer address --------k-25CDCD----------------------------- INT 25 - Stacker - GET DEVICE DRIVER ADDRESS AX = CDCDh DS:BX -> buffer for address (see #1885) CX = 0001h DX = 0000h Return: AX = CDCDh if Stacker installed DS:BX buffer filled Note: not supported by Stacker Anywhere; to obtain the Stacker device driver address and to detect drives controlled by all versions of Stacker, INT 21/AX=4404h"Stacker" or lookup via the CDS and DPB should be preferred (see INT 21/AH=52h) Stacker Anywhere does not link its built-in device driver into the standard device driver chain, but it can be found via CDS/DPB SeeAlso: INT 21/AX=4404h"Stacker" Format of Stacker v2+ driver address buffer: Offset Size Description (Table 1885) 00h WORD signature CDCDh 02h WORD ??? 0001h 04h DWORD pointer to Stacker signature at device driver offset 1Ah (see #1886) Format of Stacker v2+ device driver: Offset Size Description (Table 1886) 00h DWORD pointer to next driver, offset=FFFFh if last driver FFFFh:FFFFh for Stacker Anywhere 04h WORD device attributes (see #0988,#0989) 06h WORD device strategy entry point 08h WORD device interrupt entry point 0Ah BYTE number of subunits (drives) supported by driver 0 for Stacker Anywhere 0Bh 7 BYTEs signature "STAC-CD" for Stacker and Stacker Anywhere 12h 7 BYTEs ??? 19h BYTE always = 01h ?? (Stacker Anywhere points here) 1Ah WORD signature A55Ah (all other Stacker versions point here) 1Ch WORD Stacker version * 64h 0C8h = 200, 012Ch = 300, 0190h = 400 (also Stacker Anywhere) 1Eh WORD offset of volume-specific information offset table (list of WORDs, one per drive, containing offsets to various information) 20h 56 BYTEs n/a 58h BYTE volume number, set after INT 21/AX=4404h, INT 21/AX=4408h (use to index into volume-specific info offset table, should be set to FFh before and tested for change after) 59h 19 BYTEs n/a 6Ch 4 BYTEs ASCII string "SWAP" 70h 26 BYTEs drive mapping table (one byte for each drive A: through Z:) (only used for drives swapped by SSWAP.COM; other drives compressed by Stacker can be found with the standard device driver header signature (see INT 21/AH=52h) ---Stacker 4, Stacker Anywhere--- 8Ah 40 BYTEs ??? B2h 4 BYTEs ASCII string "SWP2" B6h 26 BYTEs drive table ??? D0h 150 BYTEs ??? 166h 60 BYTEs LZSINFO structure (see #2087 at INT 2F/AX=4A12h) SeeAlso: #1887,#0987 at INT 21/AH=52h Format of Stacker boot record: Offset Size Description (Table 1887) 1F0h 8 BYTEs Stacker signature (first byte is CDh) 1F8h DWORD pointer to start of Stacker device driver 1FCh WORD Stacker volume number 1FEh WORD ??? SeeAlso: #1886 --------c-25--FFSI4358----------------------- INT 25 - PC-CACHE.SYS - INSTALLATION CHECK AL = FFh SI = 4358h Return: SI = 6378h if installed CX = segment of device driver PC-CACHE.SYS DX = version (major in DH, minor in DL) Program: PC-CACHE.SYS is a small device driver used by PC-Cache v5.x to obtain access to certain disk drivers for devices such as Bernoulli drives SeeAlso: INT 13/AH=A0h --------D-26--------------------------------- INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions > 32M) AL = drive number (00h = A:, 01h = B:, etc) CX = number of sectors to write (not FFFFh) DX = starting logical sector number (0000h - highest sector on drive) DS:BX -> data to write Return: CF clear if successful CF set on error AH = status (see #1883) AL = error code (same as passed to INT 24 in DI) AX = 0207h if more than 64K sectors on drive -- use new-style call may destroy all other registers except segment registers Notes: original flags are left on stack, and must be popped by caller this call bypasses the DOS filesystem, though DOS 5+ invalidates any disk buffers referencing sectors which are written with this call examination of CPWIN386.CPL indicates that if this call fails with error 0408h on an old-style (<32M) call, one should retry the call with the high bit of the drive number in AL set Novell DOS 7 decides whether the old-style or new-style (>32M) version of INT 26 must be used solely on the basis of the partition's size, thus forcing use of the new-style call even for data in the first 32M of the partition BUGS: DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an invalid drive number DR DOS 3.41 will return with a jump instead of RETF, leaving the wrong number of bytes on the stack; use the huge-partition version (INT 26/CX=FFFFh) for all partition sizes under DR DOS 3.41 SeeAlso: INT 13/AH=03h,INT 25,INT 26/CX=FFFFh,INT 21/AX=7305h --------D-26----CXFFFF----------------------- INT 26 - DOS 3.31+ - ABSOLUTE DISK WRITE (>32M hard-disk partition) CX = FFFFh AL = drive number (0=A, 1=B, etc) DS:BX -> disk write packet (see #1888) Return: CF clear if successful CF set on error AH = status (see #1883) AL = error code (same as passed to INT 24 in DI) AX = 0207h if more than 64K sectors on drive -- use new-style call may destroy all other registers except segment registers Notes: partition is potentially >32M (and requires this form of the call) if bit 1 of the device attribute word in the device driver is set original flags are left on stack, and must be removed by caller this call bypasses the DOS filesystem, though DOS 5+ invalidates any disk buffers referencing sectors which are written with this call SeeAlso: INT 13/AH=03h,INT 25/CX=FFFFh,INT 26,INT 21/AX=7305h Format of disk write packet: Offset Size Description (Table 1888) 00h DWORD sector number 04h WORD number of sectors to read 06h DWORD transfer address --------G-26--------------------------------- INT 26 - COMTROL HOSTESS i/ISA DEBUGGER - ENTER/EXIT EXTENDED ADDRESSING MODE ??? Return: ??? SeeAlso: INT 23"COMTROL",INT 27"COMTROL" --------D-27--------------------------------- INT 27 - DOS 1+ - TERMINATE AND STAY RESIDENT DX = number of bytes to keep resident (max FFF0h) CS = segment of PSP Return: never Notes: this is an obsolete call INT 22, INT 23, and INT 24 are restored from the PSP does not close any open files the minimum number of bytes which will remain resident is 110h for DOS 2.x and 60h for DOS 3.0+; there is no minimum for DOS 1.x, which implements this service in COMMAND.COM rather than the DOS kernel SeeAlso: INT 21/AH=31h --------G-27--------------------------------- INT 27 - COMTROL HOSTESS i/ISA DEBUGGER - INVOKE REMOTE TURBO DEBUGGER KERNEL ??? Return: ??? Desc: invoke a copy of the remote Turbo Debugger kernel on the Hostess i controller SeeAlso: INT 20"COMTROL",INT 26"COMTROL" --------D-28--------------------------------- INT 28 C - DOS 2+ - DOS IDLE INTERRUPT SS:SP = top of MS-DOS stack for I/O functions Return: all registers preserved Desc: This interrupt is invoked each time one of the DOS character input functions loops while waiting for input. Since a DOS call is in progress even though DOS is actually idle during such input waits, hooking this function is necessary to allow a TSR to perform DOS calls while the foreground program is waiting for user input. The INT 28h handler may invoke any INT 21h function except functions 00h through 0Ch. Notes: under DOS 2.x, the critical error flag (the byte immediately after the InDOS flag) must be set in order to call DOS functions 50h/51h from the INT 28h handler without destroying the DOS stacks. calls to INT 21/AH=3Fh,40h from within an INT 28 handler may not use a handle which refers to CON at the time of the call, the InDOS flag (see INT 21/AH=34h) is normally set to 01h; if larger, DOS is truly busy and should not be reentered the default handler is an IRET instruction supported in OS/2 compatibility box the _MS-DOS_Programmer's_Reference_ for DOS 5.0 incorrectly documents this interrupt as superseded SeeAlso: INT 21/AH=34h,INT 2A/AH=84h,INT 2F/AX=1680h --------D-29--------------------------------- INT 29 C - DOS 2+ - FAST CONSOLE OUTPUT AL = character to display Return: nothing BX may be destroyed by some versions of DOS 3.3 Notes: automatically called when writing to a device with bit 4 of its device driver header set (see also INT 21/AH=52h) COMMAND.COM v3.2 and v3.3 compare the INT 29 vector against the INT 20 vector and assume that ANSI.SYS is installed if the segment is larger the default handler under DOS 2.x and 3.x simply calls INT 10/AH=0Eh the default handler under DESQview 2.2 understands the <Esc>[2J screen-clearing sequence, calls INT 10/AH=0Eh for all others SeeAlso: INT 21/AH=52h,INT 2F/AX=0802h,INT 79 --------U-29E60DCL0E------------------------- INT 29 - ShowGFX - INSTALLATION CHECK AX = E60Dh CL = 0Eh DX = C0DEh Return: DX = DEC0h Program: ShowGFX is a PCBoard graphics driver by Solar Designer --------N-2A00------------------------------- INT 2A - NETWORK - INSTALLATION CHECK AH = 00h Return: AH <> 00h if installed CF set if NetWare v2.15 NetBIOS emulator installed Note: supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET, etc. SeeAlso: INT 5C"NetBIOS" --------N-2A0000----------------------------- INT 2A - AT&T Starlan Extended NetBIOS (var length names) - INSTALLATION CHECK AX = 0000h Return: AH = DDh SeeAlso: INT 5B"Extended NetBIOS" --------N-2A01------------------------------- INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NETBIOS REQUEST,NO ERROR RETRY AH = 01h ES:BX -> NCB (see #2500 at INT 5C"NetBIOS") Return: AL = NetBIOS error code AH = status 00h no error 01h error occurred SeeAlso: AH=04h,AX=0500h,INT 5B"Extended NetBIOS",INT 5C"NetBIOS" --------N-2A02------------------------------- INT 2A - NETWORK (Microsoft) - SET NET PRINTER MODE AH = 02h ??? Return: ??? --------N-2A0300----------------------------- INT 2A - NETWORK - CHECK DIRECT I/O AX = 0300h DS:SI -> ASCIZ device name (may be full path or only drive specifier-- must include the colon) Return: CF clear if direct physical addressing (INT 13,INT 25) permissible CF set if access via files only Notes: do not use direct disk accesses if this function returns CF set or the device is redirected (INT 21/AX=5F02h) use AH=00h to determine whether the network is installed; if not, direct physical access is allowed may take some time to execute, so programs which need to check frequently should save the result of the first call this function is called by the DOS kernel on INT 25 and INT 26 supported by PC LAN Program, LAN Manage, LANtastic, NetWare, 10NET, etc. SeeAlso: INT 13/AH=02h,INT 13/AH=03h,INT 25,INT 26,INT 21/AX=5F02h --------N-2A04------------------------------- INT 2A - NETWORK - EXECUTE NetBIOS REQUEST AH = 04h AL = error retry 00h automatically retry request on errors 09h, 12h, and 21h (see #2499 at INT 5C"NetBIOS") 01h no retry 02h ??? ES:BX -> Network Control Block (see #2500 at INT 5C"NetBIOS") Return: AX = 0000h if successful AH = 01h on error AL = error code Notes: invokes either INT 5B or INT 5C as appropriate supported by PC LAN Program, LANtastic, LAN Manager, NetWare, 10NET, etc. NetWare 2.15 NetBIOS emulator returns CF clear if successful, CF set on error PC LAN Program defines any non-zero return value in AH as an error indicator for subfunction 00h, and any non-zero return value in AX as an error indicator for subfunction 01h SeeAlso: AH=00h,AH=01h,AX=0500h,INT 5B"Extended NetBIOS",INT 5C"NetBIOS" --------N-2A0500----------------------------- INT 2A - NETWORK - GET NETWORK RESOURCE AVAILABILITY AX = 0500h Return: AX reserved BX = number of network names available CX = number of network control blocks available DX = number of network sessions available Notes: supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET, etc. the application should call this function before using any network resources, and maintain its own count to avoid exceeding the network's resource limits SeeAlso: AH=00h,AH=01h,AH=04h,INT 5C"NetBIOS" --------N-2A06------------------------------- INT 2A - NETBIOS, LANtastic - NETWORK PRINT-STREAM CONTROL AH = 06h AL = function 01h set concatenation mode all printer output put in one job until return to DOS prompt 02h set truncation mode (default) printer open/close or BIOS/DOS output switch starts new job 03h flush printer output and start new print job Return: CF set on error AX = error code CF clear if successful Notes: subfunction 03h is equivalent to Ctrl/Alt/keypad-* supported by PC LAN Program, LANtastic, NetWare, 10NET, etc. LANtastic v4.x no longer supports this call this function sets the printer mode for all redirected printers SeeAlso: INT 21/AX=5D08h,INT 21/AX=5D09h,INT 2F/AX=1125h --------N-2A07------------------------------- INT 2A U - PC Network v1.00 - RECEIVER.COM - ??? AH = 07h ??? 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 SeeAlso: AH=86h --------N-2A2001----------------------------- INT 2A - MS Networks or NETBIOS - ??? AX = 2001h ??? Return: ??? Note: intercepted by DESQview 2.x --------N-2A2002----------------------------- INT 2A - NETWORK - ??? AX = 2002h ??? Return: ??? Note: called by MS-DOS 3.30-6.00 APPEND --------N-2A2003----------------------------- INT 2A - NETWORK - ??? AX = 2003h ??? Return: ??? Note: called by MS-DOS 3.30-6.00 APPEND --------N-2A4147DX0000----------------------- INT 2A U - NetSoft DOS-NET v1.20+ - INSTALLATION CHECK AX = 4147h ('AG') DX = 0000h Return: DX = 4147h if installed DS:SI -> configuration data (see #1889) Program: DOS-NET is a shareware networking package by Albert Graham Note: this call is supported by CLIENT.COM, SERVER.COM, ROUTER.COM, and NETDOS.COM SeeAlso: INT 65/DX=4147h,INT 65/DX=4741h Format of DOS-NET v1.20 configuration data area: Offset Size Description (Table 1889) 00h BYTE ??? 01h BYTE interrupt number used by DOS-NET APIs 02h WORD function number to place in AX for above interrupt 04h BYTE minor version as two BCD digits (e.g. 20h for v1.20) 05h BYTE major version number (01h for v1.20) 06h 2 BYTEs ??? 08h WORD ??? (used by ARCNET.COM) bit 15: ??? (set by MACTEST.COM) 0Ah WORD ??? (used by NDIS.COM and ODI.COM) 0Ch 22 BYTEs ??? 24h DWORD -> ??? function (set by PROTECT.COM) 28h 12 BYTEs ??? 34h DWORD -> ??? function (set by FASTVIEW.COM) 38h DWORD -> ??? function (set by FASTVIEW.COM) 58h DWORD -> ??? (offsets 04h and 1Ah from value are used by NETFILES) ??? 7Ch WORD ??? 7Eh WORD ??? (may be high half of a DWORD at 7Ch) ??? A8h DWORD -> ??? (used by SM.COM) ??? 114h WORD ??? 116h WORD ??? (may be high half of a DWORD at 114h) ??? 1BDh BYTE ??? flags bit 0: ??? bit 6: ??? ??? 1E1h BYTE ??? ??? 208h WORD ??? (used by SM.COM, MACTEST) 282h WORD ??? 284h 2 BYTEs ??? 286h WORD ??? flags bit 0: ??? ??? 31Eh WORD ??? 320h WORD ??? (used by NDIS.COM and ODI.COM) 322h 8 BYTEs ??? 32Ah WORD ??? (used by NDIS.COM and ODI.COM) ??? 33Eh 4 BYTEs ??? (used by ODI.COM) 342h N BYTEs ??? (used by NDIS.COM) ??? 3CFh BYTE ??? flags bit 2: ??? 3D2h BYTE installed-component flags bit 0: PROTECT installed bit 1: NETCACHE installed bit 3: SM.COM installed bit 7: NETDEBUG installed 3D3h BYTE installed-component flags bit 0: NETFILES installed bit 6: FASTVIEW installed ??? 3FFh BYTE ??? (used by NDIS.COM) 400h BYTE ??? 401h BYTE ??? (used by SM.COM) 402h BYTE ??? (used by SM.COM) ??? 448h BYTE ??? 449h BYTE ??? (used by MACTEST) 44Ah BYTE ??? (used by PROTECT) 44Bh BYTE ??? 44Ch BYTE ??? 44Dh BYTE ??? (used by SM.COM) 44Eh BYTE ??? (used by SM.COM, MACTEST) ??? --------N-2A7802----------------------------- INT 2A - NETWORK - PC LAN PROG v1.31+ - GET LOGGED ON USER NAME AX = 7802h ES:DI -> 8-byte buffer to be filled Return: AL = 00h if no user logged on to Extended Services AL <> 00h if user logged on to Extended Services buffer at ES:DI filled with name, padded to 8 chars with blanks. --------D-2A80------------------------------- INT 2A CU - NETWORK - BEGIN DOS CRITICAL SECTION AH = 80h AL = critical section number (00h-0Fh) (see #1890) Notes: normally hooked to avoid interrupting a critical section, rather than called the handler should ensure that none of the critical sections are reentered, usually by suspending a task which attempts to reenter an active critical section the DOS kernel does not invoke critical sections 01h and 02h unless it is patched. DOS 3.1+ contains a zero-terminated list of words beginning at offset -11 from the Swappable Data Area (see #1027 at INT 21/AX=5D06h); each word contains the offset within the DOS data segment of a byte which must be changed from C3h (RET) to 50h (POP AX) under DOS 3.x or from 00h to a nonzero value under DOS 4.0+ to enable use of critical sections. For DOS 4.0+, all words in this list point at the byte at offset 0D0Ch. MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into far calls to its own handler, and does not reflect the calls back to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or ModifyDOSInt2A=0 in the [386Enh] section Novell NETX does not issue INT 2A/AH=80h and INT 2A/AH=81h calls when it intercepts INT 21 calls and processes them itself SeeAlso: AH=81h,AH=82h,AX=8700h,INT 21/AX=5D06h,INT 21/AX=5D0Bh (Table 1890) Values for DOS critical section number: 01h DOS kernel, SHARE.EXE, DOSMGR apparently for maintaining the integrity of DOS/SHARE/NET data structures 02h DOS kernel, DOSMGR ensures that no multitasking occurs while DOS is calling an installable device driver 05h network redirector 06h DOS 4.x only IFSFUNC 08h ASSIGN.COM 0Ah MSCDEX, CORELCDX 0Fh IBM PC LAN server (while intercepting INT 10/AH=06h,07h,0Eh) --------D-2A81------------------------------- INT 2A CU - NETWORK - END DOS CRITICAL SECTION AH = 81h AL = critical section number (00h-0Fh) (see #1890) Notes: normally hooked rather than called the handler should reawaken any tasks which were suspended due to an attempt to enter the specified critical section MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into far calls to its own handler, and does not reflect the calls back to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or ModifyDOSInt2A=0 in the [386Enh] section SeeAlso: AH=80h,AH=82h,AX=8700h --------D-2A82------------------------------- INT 2A CU - NETWORK - END DOS CRITICAL SECTIONS 0 THROUGH 7 AH = 82h Notes: called by the INT 21h function dispatcher for function 0 and functions greater than 0Ch except 59h, and on process termination the handler should reawaken any tasks which were suspended due to an attempt to enter one of the critical sections 0 through 7 SeeAlso: AH=81h --------N-2A84------------------------------- INT 2A CU - NETWORK - KEYBOARD BUSY LOOP AH = 84h Note: similar to DOS's INT 28h, called from inside the DOS keyboard input loop (i.e. INT 21/AH=07h or INT 21/AH=08h) to allow the network software to process requests SeeAlso: INT 28 --------N-2A86------------------------------- INT 2A U - PC Network v1.00 - RECEIVER.COM - ??? AH = 86h ??? Return: ??? SeeAlso: AH=07h,AH=C4h --------P-2A8700----------------------------- INT 2A CU - PRINT - BEGIN BACKGROUND PRINTING AX = 8700h CF clear Return: CF clear if OK to print in background now CF set if background printing not allowed at this time Desc: used to inform interested programs that PRINT is about to start its background processing, and allow those programs to postpone the processing if necessary Notes: when PRINT gains control and wants to begin printing, it calls this function. If CF is clear on return, PRINT begins its background processing, and calls AX=8701h when it is done. If CF is set on return, PRINT will relinquish control immediately, and will not call AX=8701h PCVENUS (an early network shell by IBM and CMU) hooks this call to prevent background printing while its own code is active SeeAlso: AH=80h,AH=81h,AX=8701h --------P-2A8701----------------------------- INT 2A CU - PRINT - END BACKGROUND PRINTING AX = 8701h Desc: used to inform interested programs that PRINT has completed its background processing Note: called by PRINT after it has performed some background printing; not called if AX=8700h returned with CF set. SeeAlso: AX=8700h --------N-2A89------------------------------- INT 2A U - PC Network v1.00 - RECEIVER.COM - ??? AH = 89h AL = ??? (ASSIGN uses 08h) ??? Return: ??? --------I-2A90------------------------------- INT 2A U - IBM PC 3270 EMULATION PROGRAM - ??? AH = 90h ??? Return: ??? Note: the LANtastic redirector and SERVER.EXE use this function with AL=01h, 03h-07h,0Ch-11h --------N-2AC2------------------------------- INT 2A U - Network - ??? AH = C2h AL = subfunction 07h ??? 08h ??? BX = 0001h ??? Return: ??? Note: this function is called by the DOS 3.30-6.00 APPEND --------N-2AC4------------------------------- INT 2A U - PC Network v1.00 - RECEIVER.COM - ??? AH = C4h AL = subfunction 07h ??? 08h ??? BX = ??? ??? Return: ??? SeeAlso: AH=86h --------N-2AD800----------------------------- INT 2A U - Novell NetWare Lite - SERVER - SET ??? AX = D800h Return: nothing Desc: sets ??? flag, and sets ??? to initial value Note: called by CLIENT SeeAlso: AX=D801h,AX=D850h --------N-2AD801----------------------------- INT 2A U - Novell NetWare Lite - SERVER - RESET ??? AX = D801h Return: nothing Desc: clears the ??? flag set by AX=D800h Note: called by CLIENT SeeAlso: AX=D800h,AX=D850h --------N-2AD850----------------------------- INT 2A U - Novell NetWare Lite - CLIENT - INCREMENT ??? AX = D850h Return: nothing Desc: increments an internal byte-sized counter Note: this function is intercepted by DV/X 1.10 PEERSERV.DVR and the Advanced NetWare 4.0 DOS Requester SeeAlso: AX=D851h --------N-2AD851----------------------------- INT 2A U - Novell NetWare Lite - CLIENT - RESET ??? AX = D851h Return: nothing Desc: resets an internal byte-sized counter to zero Note: this function is intercepted by DV/X 1.10 PEERSERV.DVR and the Advanced NetWare 4.0 DOS Requester SeeAlso: AX=D850h --------N-2AD852----------------------------- INT 2A U - Novell NetWare - DOS Requester v1.03 - ??? AX = D852h Return: ??? Note: calls the NetWare Lite SERVER installation check, and sets ??? pointer SeeAlso: AX=D853h,INT 2F/AX=D880h --------N-2AD853----------------------------- INT 2A U - Novell NetWare - DOS Requester v1.03 - ??? AX = D853h Return: ??? Note: clears the pointer set by AX=D852h SeeAlso: AX=D852h --------N-2AE0------------------------------- INT 2A U - PC Network 1.00 - ??? AH = E0h AL = subfunction??? (01h,02h, maybe others) ??? Return: ??? Note: called by PCNet 1.00 NET.COM, a shell program from which others are run --------N-2AFF90----------------------------- INT 2A - PC/TCP PREDIR.EXE - ??? AX = FF90h Return: AX = ??? Note: PREDIR.EXE is the network printer redirector included as part of the PC/TCP system by FTP Software, Inc. --------N-2AFF91----------------------------- INT 2A - PC/TCP PREDIR.EXE - ??? AX = FF91h BX = ??? Return: AX = status??? --------N-2AFF92----------------------------- INT 2A - PC/TCP PREDIR.EXE - INSTALLATION CHECK AX = FF92h Return: AX = 0000h if installed BX = redirected printer port (FFFFh if no printers redirected) CX = version (CH = major, CL = minor) Note: PREDIR.EXE is the network printer redirector included as part of the PC/TCP system by FTP Software, Inc. --------N-2AFF93----------------------------- INT 2A - PC/TCP PREDIR.EXE - ??? AX = FF93h Return: AX = ??? --------N-2AFF94----------------------------- INT 2A - PC/TCP PREDIR.EXE - ??? AX = FF94h BX = ??? CX = ??? DX = ??? Return: AX = ??? Note: PREDIR.EXE is the network printer redirector included as part of the PC/TCP system by FTP Software, Inc. --------N-2AFF95----------------------------- INT 2A - PC/TCP PREDIR.EXE - GET CONFIGURATION STRINGS AX = FF95h CX = what to get 0000h ??? (returned pointer to "C:\COMMAND.COM") 0001h spooling program 0002h ??? 0003h spool file name 0004h swap file name Return: AX = status 0000h successful BX:DX -> ASCIZ configuration string --------N-2AFF96----------------------------- INT 2A - PC/TCP PREDIR.EXE - SET PRINT JOB TERMINATION CONFIGURATION AX = FF96h CX = what to set 0000h ??? 0001h print-on-hotkey state 0002h print-on-exit state 0003h print job timeout in clock ticks 0004h print-on-EOF state BX = new value (0000h disabled, 0001h enabled except for timeout) Return: AX = ??? SeeAlso: AX=FF97h Note: PREDIR.EXE is the network printer redirector included as part of the PC/TCP system by FTP Software, Inc. --------N-2AFF97----------------------------- INT 2A - PC/TCP PREDIR.EXE - GET PRINT JOB TERMINATION CONFIGURATION AX = FF97h CX = what to get 0000h ??? 0001h print-on-hotkey state 0002h print-on-exit state 0003h print job timeout in clock ticks 0004h print-on-EOF state Return: AX = status 0000h successful BX = old value (0000h disabled, 0001 enabled except for timeout) SeeAlso: AX=FF96h --------D-2B--------------------------------- INT 2B - DOS 2+ - RESERVED Note: this vector is not used in MS-DOS versions <= 6.22, and points at an IRET instruction --------D-2B--------------------------------- INT 2B - IBM ROM-DOS v4.0 - ??? AH = function 00h ??? (modifies data in IBMBIO.COM) 01h internal operations 02h ??? AL = index (00h-0Ch) Return: AX = ??? or (CMOS 2Dh and CMOS 2Eh) 03h get ??? data Return: AX = (CMOS 2Dh and CMOS 2Eh) BX = FFFFh other does nothing Note: function 03h is called by ROMSHELL.COM; if BX != 0, then the ES:DI from INT 2F/AX=1982h points at valid data SeeAlso: INT 2F/AX=1982h --------D-2C--------------------------------- INT 2C - DOS 2+ - RESERVED Note: this vector is not used in DOS versions <= 6.00, and points at an IRET --------O-2C--------------------------------- INT 2C - STARLITE architecture - KERNEL API Note: STARLITE is an architecture by General Software for a series of MS-DOS compatible operating systems (OEM DOS, NETWORK DOS, and SMP DOS) to be released in 1991. The interrupt number is subject to change before the actual release. --------m-2C--------------------------------- INT 2C R - Cloaking - CALL PROTECTED-MODE PASSALONG CHAIN Notes: when this interrupt is invoked in V86 mode, RM386 will invoke the first in a chain of protected-mode handlers, and will only pass execution to the V86-mode INT 2C handler if none of the handlers in the passalong chain handle the call instead. This is the method by which the real-mode stub of a cloaked application communicates with the protected-mode portion. the cloaking host calls the passalong chain with EAX=58494E33h ('WIN3') when MS Windows starts up and with EAX=334E4958h ('3NIW') when Windows shuts down; between these two broadcasts, the additional Windows-only Cloaking services are available this function was first introduced with RM386 (RAM-MAN/386) v6.00, the memory manager included in Helix Software's Netroom SeeAlso: INT 2C/AX=0009h,INT 2F/AX=4310h"Cloaking" --------m-2C0000----------------------------- INT 2C P - Cloaking - ALLOCATE GDT SELECTOR AX = 0000h EBX = base address CL = access mode byte CH = extended access mode byte (omit limit field) EDX = segment limit Return: CF clear if successful AX = selector CF set on error AX = error code (see #1891) Notes: this INT 2C interface is used by Netroom's DPMI.EXE v3.00 to access extended memory, set the base address to the desired physical address plus 400000h (4M) this function was first introduced with RM386 (RAM-MAN/386) v6.00, the memory manager included in Helix Software's Netroom SeeAlso: AX=0001h,AX=0002h,AX=0003h,AX=0004h,AX=0005h,INT 31/AH=57h,#0405 (Table 1891) Values for Cloaking error code: 0001h no more selectors 0002h not a GDT ring 0 selector 0003h invalid selector (out of range, not user selector) 0004h selector not allocated --------m-2C0001----------------------------- INT 2C P - Cloaking - FREE GDT SELECTOR AX = 0001h SI = selector Return: CF clear if successful CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0000h,INT 2F/AX=4310h"Cloaking" --------m-2C0002----------------------------- INT 2C P - Cloaking - SET SEGMENT BASE ADDRESS AX = 0002h SI = selector EBX = new physical base addres Return: CF clear if successful CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0000h,AX=0003h,AX=0004h,INT 31/AX=0007h,#0405 --------m-2C0003----------------------------- INT 2C P - Cloaking - SET SEGMENT LIMIT AX = 0003h SI = selector EBX = new limit Return: CF clear if successful CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0000h,AX=0002h,AX=0004h,INT 31/AX=0008h --------m-2C0004----------------------------- INT 2C P - Cloaking - SET SEGMENT ACCESS MODE AX = 0004h SI = selector CL = new access mode byte (see #0406) Return: CF clear if successful CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0005h,INT 31/AX=0009h --------m-2C0005----------------------------- INT 2C P - Cloaking - SET SEGMENT EXTENDED ACCESS MODE AX = 0005h SI = selector CL = new extended access mode byte (limit field ignored) (see #1892) Return: CF clear if successful CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0004h,INT 31/AX=0009h Bitfields for extended access mode byte: Bit(s) Description (Table 1892) 7 4K granularity instead of byte granularity 6 32-bit code segment 5 reserved (0) 4 segment available to system SeeAlso: #0407 --------m-2C0006----------------------------- INT 2C P - Cloaking - GET PROTECTED-MODE INTERRUPT VECTOR AX = 0006h CL = vector (00h-7Fh) Return: CF clear DX:EBX -> current interrupt handler Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0007h,INT 31/AX=0204h --------m-2C0007----------------------------- INT 2C P - Cloaking - SET PROTECTED-MODE INTERRUPT VECTOR AX = 0007h CL = vector (00h-7Fh) DX:EBX -> interrupt handler Return: CF clear Notes: this function was first introduced with RM386 (RAM-MAN/386) v6.00 the IDT entry's type remains unchanged SeeAlso: AX=0006h,INT 31/AX=0205h --------m-2C0008----------------------------- INT 2C P - Cloaking - GET PASSALONG ADDRESS AX = 0008h Return: CF clear DX:EBX = current passalong address Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0009h,AX=002Ch,INT 2F/AX=4310h"Cloaking" --------m-2C0009----------------------------- INT 2C P - Cloaking - SET PASSALONG ADDRESS AX = 0009h DX:EBX = new value for passalong address (see #1893) Return: CF clear Notes: when an INT 2C instruction is executed in V86 mode, the Cloaking host calls the passalong address. The handler should check whether the upcall is of interest to it, and if not it should jump to the old passalong address (retrieved with AX=0008h before the handler was installed). The final handler should return with CF clear to cause the interrupt to be reflected back to V86 mode if none of the passalong handlers is triggered this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0008h,AX=002Dh,INT 2C"PASSALONG CHAIN" (Table 1893) Values Cloaking passalong address is called with: EAX = CS:IP of byte following INT 2C instruction invoking passalong SS:EBX -> caller registers (see #1894) CF clear others undefined Return: CF clear: pass along to V86-mode INT 2C handler CF set: return immediately to V86 mode Format of Cloaking caller registers: Offset Size Description (Table 1894) 00h DWORD EDI 04h DWORD ESI 08h DWORD EBP 0Ch DWORD reserved (ESP from PUSHAD instruction) 10h DWORD EBX 14h DWORD EDX 18h DWORD ECX 1Ch DWORD EAX 20h DWORD error code 24h DWORD EIP 28h WORD CS 2Ah WORD padding 2Ch DWORD EFLAGS 30h DWORD ESP 34h WORD SS 36h WORD padding --remainder not available if protected-mode ring3 trap--- 38h WORD ES 3Ah WORD padding 3Ch WORD DS 3Eh WORD padding 40h WORD FS 42h WORD padding 44h WORD GS 46h WORD padding --------m-2C000A----------------------------- INT 2C P - Cloaking - GET BASE ADDRESS OF GDT SELECTOR AX = 000Ah SI = selector Return: CF clear if successful EBX = segment base address CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00, the memory manager included in Helix Software's Netroom SeeAlso: AX=0000h,AX=0002h,AX=000Bh --------m-2C000B----------------------------- INT 2C P - Cloaking - GET SELECTOR LIMIT AX = 000Bh SI = selector Return: CF clear if successful EBX = segment base address CF set on error AX = error code (see #1891) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=000Ah,INT 2F/AX=4310h"Cloaking" --------m-2C--------------------------------- INT 2C P - RM386 v6.00 - CLOAKING - RESERVED FOR CLOAKED BIOS USE UNDER WINDOWS AX = function (000Ch-001Fh) --------m-2C000F----------------------------- INT 2C P - Cloaking v1.01 - "Simulate_Shell_Event" AX = 000Fh ECX = event code (see #1895) DX = subfunction for event EDX high word = boost value (see #1896) SI:EDI -> completion procedure Return: CF clear if successful (event scheduled) CF set on error Note: this function is only available while MS Windows is running SeeAlso: AX=0011h,AX=0012h,INT 2F/AX=1605h,INT 2F/AX=4310h"Cloaking" (Table 1895) Values for Cloaking shell event code: 0414h Hot key event subevent 0000h: Alt-Space subevent 0001h: Alt-Enter subevent 0002h: Dir-VM 0415h Switch context subevent 0000h for DOS VM context, nonzero for System VM context 0416h Clipboard event 0417h Termination event subevent 0000h for normal termination, nonzero for error 0418h Display message subevent 0000h for normal message, nonzero for system model ASAP 0419h Crash 041Ah Paste complete subevent 0000h: normal subevent 0001h: cancelled by user subevent 0002h: cancelled 041Bh Contention event 041Ch Screen switch subevent 0000h: forward subevent 0001h: back 041Dh Filesystem change 041Eh Check Focus 041Fh Panic Bitfields for boost value: Bit(s) Description (Table 1896) 0 boost system VM until focus changes 1 boost system VM on Switcher screen 2 boost system VM until response 3 boost system VM during clipboard activity 4 boost system VM during print screen 5 boost system VM during update --------m-2C0011----------------------------- INT 2C P - Cloaking v1.01 - "Switch_VMs_and_Call_back" AX = 0011h EBX = handle of VM to be made active SI:EDI -> 32-bit FAR completion procedure Return: CF clear if successful (scheduled) CF set on error Notes: this function is only available while MS Windows is running the completion procedure is called with CF clear if the specified VM has been made active, or with CF set on error SeeAlso: AX=000Fh,AX=0012h --------m-2C0012----------------------------- INT 2C P - Cloaking v1.01 - "Query_Current_VM" AX = 0012h Return: CF clear EBX = handle of active VM ESI = handle of system VM ECX = VM status flags (see #1897) EDX = shell flags (see #1898) Note: this function is only available while MS Windows is running in enhanced mode SeeAlso: AX=000Fh,AX=0011h,AX=0013h Bitfields for VM status flags: Bit(s) Description (Table 1897) 0 in exclusive mode 1 runs in background 2 being created 3 suspended 4 not executable 5 executing in protected mode 6 contains PM application 7 32-bit PM application 8 called from VxD 9 high priority background 10 blocked on semaphore 11 awakening 12 has pageable V86 13 has locked V86 14 is scheduled 15 idle 16 closing Bitfields for shell flags: Bit(s) Description (Table 1898) 2 windowed 5 Alt-Tab reserved 6 Alt-Esc reserved 7 Alt-Space reserved 8 Alt-PrtSc reserved 9 Alt-Enter reserved 10 Alt-PrtSc reserved 11 PrtSc reserved 12 polling enabled 13 no HMA 14 has shortcut key 15 locked EMS handles 16 locked XMS handles 17 fast paste enabled 18 locked V86 memory 30 close-on-exit enabled --------m-2C0013----------------------------- INT 2C P - Cloaking v1.01 - "Issue_System_Modal_Message" AX = 0013h EDX = message box flags (see #1899) DS:ECX -> ASCIZ message text DS:EDI -> ASCIZ caption Return: CF clear EAX = response code Note: this function is only available while MS Windows is running in enhanced mode SeeAlso: AX=000Fh,AX=0012h Bitfields for message box flags: Bit(s) Description (Table 1899) 3-0 response codes (see #1900) 7-4 icon codes 1 = Warning hand 2 = exclamation mark 4 = asterisk 9-8 default response (0 = first button, 1 = second, 2 = third) 12 message is system model 15 don't change focus 29 hang with interrupts enabled 30 do not window 31 execute ASAP (Table 1900) Values for response codes: 00h OK 01h OK, Cancel 02h Abort, Retry, Ignore 03h Yes, No, Cancel 04h Yes, No 05h Retry, Cancel --------m-2C001D----------------------------- INT 2C P - Cloaking v1.01 - GET INT 2C API HANDLER ENTRY POINT AX = 001Dh Return: CF clear DX:EBX = selector:offset of Cloaking host INT 2C handler Desc: get the Cloaking host's entry point to bypass any other programs which may have hooked INT 2C in protected mode Note: the returned entry point must be called with a simulated INT, i.e. a PUSHD must precede the far call to the handler SeeAlso: INT 2F/AX=4310h"Cloaking" --------m-2C001E----------------------------- INT 2C P - Cloaking v1.01 - CLEAR CRITICAL SECTION AX = 001Eh Return: CF clear Desc: allow MS Windows to switch to another VM after having prevented it by invoking a critical section SeeAlso: AX=001Fh,INT 15/AX=101Ch,INT 2F/AX=1682h --------m-2C001F----------------------------- INT 2C P - Cloaking v1.01 - SET CRITICAL SECTION AX = 001Fh Return: CF clear Desc: prevent MS Windows from switching to another VM SeeAlso: AX=001Eh,INT 15/AX=101Bh,INT 2F/AX=1681h --------m-2C0020----------------------------- INT 2C P - Cloaking - GET SIZE OF PROTECTED-MODE STATE AX = 0020h Return: EAX = number of bytes required for storing state Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0021h,AX=0022h --------m-2C0021----------------------------- INT 2C P - Cloaking - SAVE PROTECTED-MODE STATE AX = 0021h ES:EDI -> buffer for protected-mode state Return: CF clear buffer filled Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0020h,AX=0022h --------m-2C0022----------------------------- INT 2C P - Cloaking - RESTORE PROTECTED-MODE STATE AX = 0022h DS:ESI -> buffer containing previously-saved protected-mode state Return: CF clear if successful state restored CF set on error (invalid buffer contents) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0020h,AX=0021h --------m-2C0023----------------------------- INT 2C P - Cloaking - ISSUE PROTECTED-MODE XMS CALL AX = 0023h Notes: not currently implemented--NOP in RM386 v6.00 this function was first introduced with RM386 (RAM-MAN/386) v6.00 --------m-2C0024----------------------------- INT 2C P - Cloaking - SET V86-MODE STACK AX = 0024h DX:EBX = new value for V86-mode SS:ESP Return: nothing Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 --------m-2C0025----------------------------- INT 2C P - Cloaking - CALL V86-MODE PROCEDURE AX = 0025h DS:EBX -> client register structure (see #1894) Return: CF clear if successful client register structure updated CF set if no more nested procedure call space available Notes: this call uses the V86-mode stack supplied in the client structure, and calls the routine specified by CS:IP in the client structure this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0026h,AX=0027h,INT 31/AX=0301h --------m-2C0026----------------------------- INT 2C P - Cloaking - CALL V86-MODE INTERRUPT HANDLER AX = 0026h DS:EBX -> client register structure (see #1894) CX = interrupt number Return: CF clear if successful client register structure updated CF set if no more nested procedure call space available Notes: this call uses the V86-mode stack supplied in the client structure this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0025h,AX=0027h,INT 31/AX=0300h --------m-2C0027----------------------------- INT 2C P - Cloaking - CHAIN TO V86-MODE INTERRUPT HANDLER AX = 0027h DS:EBX -> client register structure (see #1894) Return: CF clear if successful client register structure updated CF set if no more nested procedure call space available Notes: this call uses the V86-mode stack supplied in the client structure, and jumps to the address specified by CS:IP in the client structure this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0025h,AX=0026h --------m-2C0028----------------------------- INT 2C P - Cloaking - GET ESP0 FROM TSS AX = 0028h Return: CF clear EAX = TSS's ESP0 Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00, the memory manager included in Helix Software's Netroom --------m-2C0029----------------------------- INT 2C P - Cloaking - SET SECONDARY STACK AX = 0029h DX:EBX = new value for SS:ESP of ring 3 secondary stack Return: CF clear Desc: inform RM386 of the ring 3 interrupt stack location Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 --------m-2C002A----------------------------- INT 2C P - Cloaking - SET 8259 IRQ BASE VECTORS AX = 002Ah BL = base vector of master interrupt controller CL = base vector of slave interrupt controller Notes: this call merely informs RM386 that the caller has changed the interrupt mappings this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: INT 67/AX=DE0Bh --------m-2C002BCH81------------------------- INT 2C P - Cloaking - PROTECTED-MODE VIRTUAL DMA SERVICES AX = 002Bh CH = 81h CL = subfunction (02h-0Ch) other registers as appropriate for subfunction Return: varies by function CF set on error Notes: these functions are equivalent to the INT 4B/AX=81xxh subfunctions with the same numbers this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: INT 4B/AX=8102h,INT 4B/AX=810Ch --------m-2C002C----------------------------- INT 2C P - Cloaking - GET PORT-TRAPPING PASSALONG AX = 002Ch Return: CF clear DX:EBX = current I/O trapping passalong address Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0008h,AX=002Dh --------m-2C002D----------------------------- INT 2C P - Cloaking - SET PORT-TRAPPING PASSALONG AX = 002Dh DX:EBX = new I/O trapping passalong address (see #1901) Return: CF clear Notes: RM386 calls the passalong address whenever an access to a monitored I/O port is attempted; the handler should check whether it is a port that it is interested in, and if not call the previous passalong address (which was retrieved with AX=002Ch before installing the new handler) this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=0009h,AX=002Ch,INT 67/AX=5DEAh (Table 1901) Values Cloaking port-trapping passalong address is called with: EAX = CS:IP of faulting instruction (unless executing in protected-mode ring 3) SS:EBX -> caller register structure (see #1894) check EFLAGS V86-mode bit for type CX = first two bytes of I/O instruction which was trapped DX = port to which I/O is being performed CF clear Return: CF clear if RM386 should perform I/O operation CF set if I/O should be skipped Note: RM386 skips the trapped I/O instruction, so the passalong handler should not modify the client CS:EIP --------m-2C002E----------------------------- INT 2C P - Cloaking - TRAP I/O PORT AX = 002Eh DX = port number to trap Return: CF clear if successful CF set on error (port out of range or reserved) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=002Fh,AX=0030h --------m-2C002F----------------------------- INT 2C PU - Cloaking - UNTRAP I/O PORT AX = 002Fh DX = port number for which to cancel trapping Return: CF clear if successful CF set on error (port out of range or reserved) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=002Eh,AX=0030h --------m-2C0030----------------------------- INT 2C PU - Cloaking - GET TRAPPING STATE OF SPECIFIED PORT AX = 0030h DX = port number Return: CF clear if successful BX = current state (0000h not trapped, 0001h trapped) CF set on error (port out of range or reserved) Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00 SeeAlso: AX=002Eh,AX=002Fh --------m-2C0031----------------------------- INT 2C PU - RM386 v6.00 - BUG AX = 0031h Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's Netroom Note: due to a fencepost error, RM386 v6.00 will branch unpredictably if invoked with this function --------m-2C0031----------------------------- INT 2C P - Cloaking v1.01 - ALLOCATE V86 CALLBACK AX = 0031h DX:EBX = CS:EIP of protected-mode routine to be invoked by callback Return: CF clear if successful EBX = CS:IP of V86-mode callback handler CF set on error SeeAlso: AX=0032h --------m-2C0032----------------------------- INT 2C P - Cloaking v1.01 - FREE V86 CALLBACK AX = 0032h EBX = CS:IP of V86-mode callback handler Return: CF clear if successful CF set on error AX = error code 0005h invalid callback address 0006h callback already free SeeAlso: AX=0032h --------m-2C0033----------------------------- INT 2C P - Cloaking v1.01 - REGISTER CLOAKING CLIENT AX = 0033h DS:EDX -> client registration structure (see #1902) Return: CF clear if successful CF set on error (linked list corrupt) SeeAlso: AX=0034h,#2058 at INT 2F/AX=4310h"Cloaking" Format of client registration structure: Offset Size Description (Table 1902) 00h PWORD link to next structure 06h PWORD link to previous structure 0Ch 2 BYTEs client version (major, minor) 0Eh 20 BYTEs client name 22h DWORD physical address of client start 26h DWORD client's total size in bytes Note: the link area should not be modified once the structure has been used for the registration call --------m-2C0034----------------------------- INT 2C P - Cloaking v1.01 - UNREGISTER CLOAKING CLIENT AX = 0034h DS:EDX -> client registration structure (see #1902) Return: CF clear if successful CF set on error (linked list corrupt) Note: the client must unregister before freeing the XMS block containing its registration structure(s) SeeAlso: AX=0033h,#2058 at INT 2F/AX=4310h"Cloaking" --------D-2D--------------------------------- INT 2D - DOS 2+ - RESERVED Note: this vector is not used in DOS versions <= 6.00, and points at an IRET BUG: RM386 v6.00-6.02 (as distributed with Helix's Netroom v3.x) contains a stack bug in its protected-mode INT 2D handler which causes a crash when INT 2D is invoked from V86 mode --------t-2D--------------------------------- INT 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.6] AH = multiplex number AL = function 00h installation check 01h get private entry point 02h uninstall 03h request popup 04h determine chained interrupts 05h get hotkey list 06h get device-driver information 07h-0Fh reserved for future enhancements Return: AL = 00h (not implemented) other application-dependent other registers vary by function (also see individual entries below) Return: varies by function Notes: programs should not use fixed multiplex numbers; rather, a program should scan all multiplex numbers from 00h to FFh, remembering the first unused multiplex in case the program is not yet installed. For multiplex numbers which are in use, the program should compare the first 16 bytes of the signature string to determine whether it is already installed on that multiplex number. If not previously installed, it should use the first free multiplex number. functions other than 00h are not valid unless a program is installed on the selected multiplex number to be considered fully compliant with version 3.6 of the specification, programs must implement at least functions 00h, 02h (no resident uninstall code required), and 04h (return value 04h). TSRs that provide hotkeys with which the user can activate them must also implement function 05h. TSRs which provide DOS device drivers must also implement function 06h. The absolute minimum fully-compliant implementation has an overhead of 64 bytes (80 bytes with function 05h) plus 22 bytes per hooked interrupt (for the interrupt sharing protocol header and hook list entry). the signature string and description may be used by memory mappers to display the installed programs to be considered fully compliant, users of this specification must adhere to the IBM interrupt sharing protocol (see #1903), which will permit removal of TSRs in arbitrary order and interrupt handler reordering. All TSRs following this specification should be removable unless they are loaded from CONFIG.SYS, though they need not keep the code for removing themselves resident; it is acceptable for a separate program to perform the interrupt unhooking and memory-freeing steps of removal. A sample public-domain implementation including example TSRs and utility programs may be found in a separate package distributed as AMISLnnn.ZIP (AMISL092.ZIP as of this writing). Please let me know if you choose to follow this proposal. The signature and a list of the private API calls you use would be appreciated, as well. SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h SeeAlso: INT 2D/AL=05h,INT 2D/AL=06h,INT 2F"NOTES" Format of interrupt sharing protocol interrupt handler entry point: Offset Size Description (Table 1903) 00h 2 BYTEs short jump to actual start of interrupt handler, immediately following this data block (EBh 10h) 02h DWORD address of next handler in chain 06h WORD signature 424Bh 08h BYTE EOI flag 00h software interrupt or secondary hardware interrupt handler 80h primary hardware interrupt handler (will issue EOI) 09h 2 BYTEs short jump to hardware reset routine must point at a valid FAR procedure (may be just RETF) 0Bh 7 BYTEs reserved (0) by IBM for future expansion Note: when chaining to the prior handler, the interrupt handler must perform an indirect jump/call using the address at offset 02h in the ISP header. This permits another AMIS TSR to hook itself into the chain at a position other than as the first handler to receive an interrupt. SeeAlso: INT F1/AH=01h"Common ISDN API",INT F1/AH=06h"CAPI",#3281 --------t-2D--00----------------------------- INT 2D - AMIS v3.0+ - INSTALLATION CHECK AL = 00h AH = multiplex number for program Return: AL = 00h if free AL = FFh if multiplex number in use CX = binary version number (CH = major, CL = minor) DX:DI -> signature string (see #1904) identifying the program using the multiplex number SeeAlso: INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h SeeAlso: INT 2D/AL=06h Index: installation check;Alternate Multiplex Interrupt Specification Index: installation check;AMIS|installation check;FASTMOUS Index: installation check;SPELLER|installation check;Monitor Index: installation check;NOLPT|installation check;NOTE Index: installation check;RBkeyswp|installation check;SWITCHAR Index: installation check;VGABLANK|installation check;EATMEM Index: installation check;RECALL|installation check;XPTR2 Format of AMIS signature string: Offset Size Description (Table 1904) 00h 8 BYTEs blank-padded manufacturer's name (possibly abbreviated) 08h 8 BYTEs blank-padded product name 10h 64 BYTEs ASCIZ product description (optional, may be a single 00h) Note: it is not necessary to reserve a full 64 bytes for the description, just enough to store the actual ASCIZ string SeeAlso: #1905 (Table 1905) Values for AMIS signatures known to be in use: 'Byrial J' 'EKLAVO ' permits keyboard entry of Esperanto accented letters 'CoveSoft' 'Burnout+' shareware screen saver Burnout Plus 'Crynwr ' 'SPELLER ' TSR spelling-checker 'CPH1995 ' 'CDTSR ' resident CD-Audio player 'CPH1996 ' 'DSAPI ' 'CSJewell' 'Modula3L' Curtis Jewell's Modula-3 compiler (non-TSR) 'DAISYCHA' 'INDRIVER' Advanced Parallel Port daisy chain driver (vendor name in product description field, if desired) (see also INT 2D/AL=DCh) 'DTown SD' 'DTU ' DTown Software Development's DTown Utilities (see also INT 2D/AL=20h) 'ECLIPSE ' 'PLUMP ' Eclipse Software's printer and plotter spooler 'GraySoft' 'GIPC ' GraySoft's Inter-Process Communications driver 'heathh ' 'Monitor ' 'Helge O ' TSRs by Helge Olav Helgesen 'J. Berry' 'RATSR ' RemoteAccess Network Manager workstation module 'JWB ' 'RAMLIGHT' James Birdsall's on-screen RAMdisk activity indicator 'M Better' 'iHPFS ' Marcus Better's HPFS filesystem driver for DOS 'M. Paul ' 'FREEVER ' DOS version-faking TSR by Matthias Paul 'Nildram ' 'ST ' Screen Thief graphics screen grabber 'Pino Nav' 'ALTMENU ' activate any program's menu bar by pressing Alt key 'Pino Nav' 'Keybit ' Pino Navato's KEYBIT Lite Italian keyboard driver v4+ 'PowrQuot' 'CAPRILOG' 'PowrQuot' 'CAPRITSR' 'PowrQuot' 'CAPRIWIN' 'R-Ware ' 'dLite ' run-time data decompression TSR 'Ralf B ' 'disaXXYY' RBdisabl -- disable key scancode XX w/ shift states YY 'Ralf B ' 'DUALVGA ' dual-VGA support, screen blanker, and DPMS driver 'Ralf B ' 'FASTMOUS' example TSR included with sample AMIS library code 'Ralf B ' 'NoBreak ' disable Ctrl-@, Ctrl-C, and Ctrl-Break keys 'Ralf B ' 'NOLPT n ' example TSR -- turn LPTn into bit-bucket 'Ralf B ' 'NOTE ' example TSR -- popup note-taker 'Ralf B ' 'RBclock ' RBclock -- on-screen real-time clock 'Ralf B ' 'RBclockE' RBclock -- on-screen elapsed-time clock 'Ralf B ' 'RBdvorak' Dvorak keyboard mapping w/ opt Esc/~, LCtrl/CapsLk swap 'Ralf B ' 'RBkcount' display count of keystrokes on screen 'Ralf B ' 'RBkeyswp' RBkeyswap v3.0+ -- swap Esc/~ and LCtrl/CapsLock keys 'Ralf B ' 'RBnoboot' disable Ctrl-Alt-Del key combination 'Ralf B ' 'ShftCaps' require Shift-CapsLock to turn on CapsLock 'Ralf B ' 'ShftNumL' require Shift-NumLock to turn off NumLock 'Ralf B ' 'SWITCHAR' example TSR -- add switchar() support removed from DOS5 'Ralf B ' 'VGABLANK' VGA-only screen blanker 'Sally IS' 'Mdisk ' removeable, resizeable RAMdisk 'Sally IS' 'Scr2Tex ' screen dumper with output in (La)Tex format 'SRT ' 'STOPBOOT' reboot preventer by Steve Talbot 'Thaco ' 'NEST ' Eirik Pedersen's programmer's delimiter matcher 'TifaWARE' 'EATMEM ' George A. Theall's public domain memory restrictor for testing programs (v1.1+) 'TifaWARE' 'RECALL ' public domain commandline editor and history (v1.2+) 'Todd ' 'XPTR2 ' PC-to-Transputer interface by Todd Radel 'WlkngOwl' 'NoiseSYS' NOISE.SYS random-number generator SeeAlso: #1904 --------t-2D--01----------------------------- INT 2D - AMIS v3.0+ - GET PRIVATE ENTRY POINT AL = 01h AH = multiplex number for program Return: AL = 00h if all API calls via INT 2D AL = FFh if entry point supported DX:BX -> entry point for bypassing interrupt chain Note: this function is not valid unless a program is installed on the specified multiplex number; use INT 2D/AL=00h to check SeeAlso: INT 2D/AL=00h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h SeeAlso: INT 2D/AL=06h Index: entry point;Alternate Multiplex Interrupt|entry point;AMIS --------t-2D--02----------------------------- INT 2D - AMIS v3.0+ - UNINSTALL AL = 02h AH = multiplex number for program DX:BX = return address for successful uninstall (may be ignored by TSR) Return: AL = status 00h not implemented (makes TSR non-compliant with specification) 01h unsuccessful 02h can not uninstall yet, will do so when able 03h safe to remove, but no resident uninstaller (TSR still enabled) BX = segment of memory block with resident code 04h safe to remove, but no resident uninstaller (TSR now disabled) BX = segment of memory block with resident code 05h not safe to remove now, try again later 06h disabled, but can not be removed from memory because loaded from CONFIG.SYS 07h safe to remove, but no resident device-driver uninstaller. Caller must unlink device drivers from DOS device chain as well as unhooking interrupts and freeing memory BX = segment of memory block with resident code FFh successful return at DX:BX with AX destroyed if successful and TSR honors specific return address Note: this function is not valid unless a program is installed on the specified multiplex number; use INT 2D/AL=00h to check SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h SeeAlso: INT 2D/AL=06h Index: uninstall;Alternate Multiplex Interrupt Specification|uninstall;AMIS --------t-2D--03----------------------------- INT 2D - AMIS v3.0+ - REQUEST POP-UP AL = 03h AH = multiplex number for program Return: AL = status 00h not implemented or TSR is not a pop-up 01h can not pop up at this time, try again later 02h can not pop up yet, will do so when able 03h already popped up 04h unable to pop up, user intervention required BX = standard reason code 0000h unknown failure 0001h interrupt chain passes through memory which must be swapped out to pop up 0002h swap-in failed CX = application's reason code if nonzero FFh TSR popped up and was exited by user BX = return value 0000h no return value 0001h TSR unloaded 0002h-00FFh reserved 0100h-FFFFh application-dependent Note: this function is not valid unless a program is installed on the specified multiplex number; use INT 2D/AL=00h to check SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=04h,INT 2D/AL=05h SeeAlso: INT 2D/AL=06h --------t-2D--04----------------------------- INT 2D - AMIS v3.0+ - DETERMINE CHAINED INTERRUPTS AL = 04h AH = multiplex number for program BL = interrupt number (except 2Dh) Return: AL = status 00h not implemented (makes TSR non-compliant with specification) 01h (obsolete) unable to determine 02h (obsolete) interrupt hooked 03h (obsolete) interrupt hooked, address returned DX:BX -> TSR's interrupt BL handler 04h list of hooked interrupts returned DX:BX -> interrupt hook list (see #1906) FFh interrupt not hooked Notes: BL is ignored if the TSR returns AL=04h; in that case, the caller needs to scan the return list rather than making additional calls to this function. If the return is not 00h or 04h, then the caller must cycle through the remaining interrupt numbers it wishes to check. return values 01h through 03h may not be used by AMIS v3.6-compliant programs; they are included here solely for compatibility with version 3.3, though they were probably never used in any implementation for return values 01h through 03h, since INT 2D is known to be hooked, the resident code need not test for BL=2Dh (to minimize its size), and the return value is therefore undefined in that case. this function is not valid unless a program is installed on the specified multiplex number; use INT 2D/AL=00h to check SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=05h SeeAlso: INT 2D/AL=06h Format of AMIS interrupt hook list [array]: Offset Size Description (Table 1906) 00h BYTE interrupt number (last entry in array is 2Dh) 01h WORD offset within hook list's segment of the interrupt handler this will point at the initial short jump of the interrupt sharing protocol header (see #1903) SeeAlso: #1907 --------t-2D--05----------------------------- INT 2D - AMIS v3.5+ - GET HOTKEYS AL = 05h AH = multiplex number for program Return: AL = status 00h not implemented FFh supported DX:BX -> hotkey list (see #1907) Notes: this function is not valid unless a program is installed on the specified multiplex number; use INT 2D/AL=00h to check programs which provide hotkeys are required to provide this function to be fully compliant with this specification SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h SeeAlso: INT 2D/AL=06h Format of AMIS hotkey list: Offset Size Description (Table 1907) 00h BYTE type of hotkey checking (see #1908) 01h BYTE number of hotkeys (may be zero if TSR can disable hotkeys) 02h 6N BYTEs array of hotkey definitions (one per hotkey, first should be primary hotkey) Offset Size Description 00h BYTE hotkey scan code (00h/80h if shift states only) hotkey triggers on release if bit 7 set 01h WORD required shift states (see #1909) 03h WORD disallowed shift states (see #1909) 05h BYTE hotkey flags (see #1910) Notes: except for bit 7, the shift states correspond exactly to the return values from INT 16/AH=12h. A set bit in the required states word indicates that the corresponding shift state must be active when the hotkey's scan code is received for the hotkey to be recognized; a clear bit means that the corresponding state may be ignored. A set bit in the disallowed shift states word indicates that the corresponding shift state must be inactive. for the disallowed-states word, if one of the "either" bits is set, then both the corresponding left bit and right bit must be set examples: Ctrl-Alt-Del monitoring: 53h 000Ch 0003h 06h Alt-key tap (DESQview): B8h 0000h 0007h 08h Shf-Shf-N (NOTE.COM): 31h 0003h 000Ch 00h Index: hotkeys;AMIS SeeAlso: #0005 Bitfields for type of AMIS hotkey checking: Bit(s) Description (Table 1908) 0 checks before chaining INT 09 1 checks after chaining INT 09 2 checks before chaining INT 15/AH=4Fh 3 checks after chaining INT 15/AH=4Fh 4 checks on INT 16/AH=00h,01h,02h 5 checks on INT 16/AH=10h,11h,12h 6 checks on INT 16/AH=20h,21h,22h 7 reserved (0) SeeAlso: #1907 Bitfields for AMIS shift states: Bit(s) Description (Table 1909) 0 right shift pressed 1 left shift pressed 2 either control key pressed 3 either Alt key pressed 4 ScrollLock active 5 NumLock active 6 CapsLock active 7 either shift key pressed 8 left control key pressed 9 left Alt key pressed 10 right control key pressed 11 right Alt key pressed 12 ScrollLock pressed 13 NumLock pressed 14 CapsLock pressed 15 SysReq key pressed Notes: if bit 2 is set, either control key may be pressed for the hotkey; if bits 8 and 10 are both set, then both control keys must be pressed. Similarly for bits 3 and 9/11, as well as 7 and 0/1. the SysReq key is often labeled SysRq SeeAlso: #1907,#1910 Bitfields for AMIS hotkey flags: Bit(s) Description (Table 1910) 0 hotkey chained before processing 1 hotkey chained after processing 2 others should pass through this hotkey so that it can be monitored 3 hotkey will not activate if other keys pressed/released before hotkey press is completed 4 this key is remapped into some other key 5 this key is conditionally chained (sometimes passed on, sometimes swallowed) 6-7 reserved (0) SeeAlso: #1907,#1909 --------t-2D--06----------------------------- INT 2D - AMIS v3.6 - GET DEVICE-DRIVER INFORMATION AL = 06h AH = multiplex number for program Return: AL = number of device driver headers supplied by prog. AH = device-driver flags (see #1911) DX:BX -> first device driver header (see #0987) Program: AMIS is the Alternate Multiplex Interrupt Specification promulgated by Ralf Brown Notes: if AL=00h, AH,BX,DX are meaningless and may be destroyed this function is not valid unless a program is installed on the specified multiplex number; use INT 2D/AL=00h to check programs which provide device drivers are required to support this function to be considered fully compliant with v3.6+ of the specification SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h SeeAlso: INT 2D/AL=05h Bitfields for AMIS device-driver information flags: Bit(s) Description (Table 1911) 0 program loaded from CONFIG.SYS, and thus can not be removed from memory (leave clear if unable to determine) 1 device driver headers have not been linked into DOS device chain 2 reentrant device driver(s) --------N-2D--10----------------------------- INT 2D - RATSR 2.0+ - GET STATUS AL = 10h AH = AMIS multiplex number for RATSR Return: AL = status 01h listening (no connection) 02h receiving \ 03h sending > station being monitored 04h initializing receive / AH = keyboard lock status (00h unlocked, 01h locked) Program: RATSR is a utility by James Berry provided with RemoteAccess/Professional, a commercial bulletin board system, that allows remote control of a station over a network SeeAlso: INT 2D"AMIS" --------d-2D--10----------------------------- INT 2D - dLite 1.0+ - GET PARAMETER BLOCK ADDRESS AL = 10h AH = AMIS multiplex number for dLite Return: CF clear if successful ES:BX -> parameter block (see #1912) CF set on error Program: dLite is a shareware TSR by Rainer Schuetze which transparently expands compressed files when they are read SeeAlso: AL=11h"dLite",AL=12h"dLite",INT 21/AX=FEDCh"PCMANAGE" Format of dLite parameter block: Offset Size Description (Table 1912) 00h BYTE TSR flags (see #1913) 01h WORD maximum number of programs needing original filesize 03h WORD current number of programs needing original filesize 05h WORD maximum number of files that can be handled by dLite (should be the same as FILES= in CONFIG.SYS) 07h WORD offset (in the same segment as the parameter block) of the table of programs needing the original filesize (8 bytes each, without path or extension, uppercase, and zero \ terminated if shorter than 8 bytes) Bitfields for dLite TSR flags: Bit(s) Description (Table 1913) 0 deny FCB access 1 dLite sleeping rather than activated 2 always indicate original filesize when reading directory entries, rather than only for specified programs 3-7 reserved SeeAlso: #1912 --------V-2D--10----------------------------- INT 2D - Burnout Plus v3.00 - GET STATE/CONTROL INFORMATION AL = 10h AH = AMIS multiplex number for Burnout Plus Return: AL = 01h BX = Burnout Plus status (see #1914) CX = record of features loaded (see #1915) ES:DI -> Burnout Plus control structure (see #1916) Program: Burnout Plus is a DOS screen saver from Cove Software SeeAlso: INT 14/AX=AA01h,INT 2D"AMIS" Index: screen saver;Burnout Plus Bitfields for Burnout Plus status: Bit(s) Description (Table 1914) 0 screen is blanked 1 MS Windows is active (Burnout Plus deactivated) 2-15 reserved Bitfields for Burnout Plus features loaded/features enabled: Bit(s) Description (Table 1915) 0 mouse activity monitor 1 passkey support 2 password support 3 continuous clear 4 software blanking 5 video activity monitor 6 disk activity monitor 7 activating keystroke suppression SeeAlso: #1916 Format of Burnout Plus control structure: Offset Size Description (Table 1916) 00h BYTE size of structure in bytes 01h WORD Burnout Plus version 03h WORD screen blanking reset count in clock ticks 05h WORD current countdown value in clock ticks 07h BYTE type of timeout specification 08h BYTE instant-blank hotkey 09h WORD extended status information (see #1917) the bits for password, passkey, and software blanking are ignored and cannot be enabled or disabled externally 0Bh WORD features enabled (see #1915) Note: all fields except the first two may be modified by external programs to affect the operation of Burnout Plus Index: hotkeys;Burnout Plus Bitfields for extended Burnout Plus status information: Bit(s) Description (Table 1917) 0 Burnout Plus disabled 1 force screen to blank on next clock tick 2 restore screen if currently blanked 3-15 reserved Note: 1 and 2 are automatically cleared by Burnout Plus after blanking or restoring the screen SeeAlso: #1916 --------V-2D--10----------------------------- INT 2D U - Screen Thief v1.00 - FREE HIGH MEMORY BUFFERS AL = 10h AH = AMIS multiplex number for Screen Thief Return: nothing Program: Screen Thief is a graphics screen grabber Note: releases any code and data stored in EMS, DOS UMBs, or XMS UMBs, but does not release the low-memory stub; this may be used to effect a partial uninstall if INT 2D/AL=02h fails SeeAlso: INT D8"Screen Thief" --------i-2D--10----------------------------- INT 2D U - RAMLIGHT v1.0 - GET MONITORING INFORMATION AL = 10h AH = AMIS multiplex number for RAMLIGHT Return: ES:BX -> array of fake device driver headers used in monitoring CX = number of drives being monitored??? --------U-2D--10----------------------------- INT 2D - DTown Utilities v1.40+ - EXTENDED API INSTALLATION CHECK AL = 10h Return: AL = FFh BL = extended API availability (00h no, 01h API is loaded) SeeAlso: INT 2D/AL=11h"DTown",INT 2D/AL=20h,INT 2D/AL=50h --------s-2D--10----------------------------- INT 2D - CDTSR - GET INTERNAL VARIABLE TABLE AL = 10h AH = AMIS multiplex number for CDTSR Return: CX:DX -> CDTSR internal variable structure (see #1918) Program: CDTSR is a resident audio CD player by Colin Hill SeeAlso: INT 2D/AL=11h"CDTSR",INT 2D/AL=12h"CDTSR",INT 2D/AL=13h"CDTSR" Format of CDTSR internal variable structure: Offset Size Description (Table 1918) 00h BYTE hotkey scan code (see #0005) 01h BYTE hotkey shift states 02h BYTE flag: repeat 03h BYTE flag: custom repeat 04h BYTE flag: background polling 05h DWORD (read-only) internal timing variable 09h DWORD current track play position, in frames 0Dh DWORD current disk play position, in frames 11h BYTE number of entries in track program 12h BYTE index into track program currently playing (FFh if not playing) 13h 100 BYTEs track program (each byte contains one track number) 77h BYTE saved cursor end scan line 78h BYTE saved cursor start scan line 79h BYTE currently playing track 7Ah BYTE CD driver media-change flag 7Bh WORD video base segment during last popup 7Dh WORD video page offset during last popup 7Fh BYTE currently-selected track 80h DWORD begin of custom repeat, in frames 84h DWORD end of custom repeat, in frames 88h WORD track program index of top list item --------K-2D--10----------------------------- INT 2D - KEYBIT Lite v5+ - GET POINTER TO STATUS BYTE AL = 10h AH = AMIS multiplex number for KEYBIT Lite Return: DX:BX -> status byte (see #1919) Program: KEYBIT Lite is an enhanced Italian keyboard driver by Pino Navato. SeeAlso: INT 2D"AMIS" Bitfields for KEYBIT Lite status byte: Bit(s) Description (Table 1919) 7 KEYBIT Lite active 6 E-mail support active 5-0 reserved Notes: E-mail support is one of the original features of KEYBIT Lite. It is the automatic conversion of the 8-bits ASCII chars produced by some keys available on Italian keyboards to couples of 7-bits chars. Message editors should always enable e-mail support, they should also restore its original status before exiting. The user can change both status bits by hotkeys. --------K-2D--10----------------------------- INT 2D - ALTMENU - GET POINTER TO KEY CODE AL = 10h AH = AMIS multiplex number for signature 'Pino Nav' 'ALTMENU ' Return: DX:BX -> WORD key code to insert in keyboard buffer on Alt-key tap Program: Pino Navato's freeware ALTMENU permits activating the menu bar of any program by pressing the Alt key alone. Notes: The value in the key code word will be returned in AX by a call to INT 16/AH=00h after the Alt key is pressed by itself ALTMENU may be disabled by setting the key code equal to 0000h SeeAlso: INT 16/AH=00h,INT 2D"AMIS" --------d-2D--11----------------------------- INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET ORIGINAL SIZE AL = 11h AH = AMIS multiplex number for dLite BX = file handle Return: CF clear if successful DX:AX = size of uncompressed file CF set on error (not dPressed file) SeeAlso: AL=10h"dLite",AL=12h"dLite" --------U-2D--11----------------------------- INT 2D - DTown Utilities v1.40+ - UTILITY INSTALLATION CHECK AL = 11h BL = function 00h get number of installed utilities Return: BL = number of utilities 01h get installed utilities DX:DI -> buffer containing one byte for each utility Return: DX:DI buffer filled with flags (0=no,1=yes) indicating whether the corresponding utility is loaded Return: AL = FFh if supported Note: this function is only available if the extended API has been installed in the resident portion SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h --------s-2D--11----------------------------- INT 2D - CDTSR - REPROGRAM CDTSR AL = 11h AH = AMIS multiplex number for CDTSR Return: nothing Program: CDTSR is a resident audio CD player by Colin Hill Desc: reprograms CDTSR based on the values in the internal variable structure (see #1918), which may have been changed by an application SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=12h"CDTSR",INT 2D/AL=13h"CDTSR" --------d-2D--12----------------------------- INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET COMPRESSED SIZE AL = 12h AH = AMIS multiplex number for dLite BX = file handle Return: CF clear if successful DX:AX = size of compressed file CF set on error (not dPressed file) SeeAlso: AL=10h"dLite",AL=11h"dLite" --------s-2D--12----------------------------- INT 2D - CDTSR - DISABLE POPUP AL = 12h AH = AMIS multiplex number for CDTSR Return: nothing SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=11h"CDTSR",INT 2D/AL=13h"CDTSR" --------U-2D--12----------------------------- INT 2D - FREEVER - GET ORIGINAL DOS VERSION INFO AL = 12h AH = AMIS multiplex number for FREEVER 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) Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar to SETVER for any DOS-compatible OS, written by Matthias Paul SeeAlso: INT 2D/AL=13h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=17h"FREEVER" --------s-2D--13----------------------------- INT 2D - CDTSR - ENABLE POPUP AL = 13h AH = AMIS multiplex number for CDTSR Return: nothing Program: CDTSR is a resident audio CD player by Colin Hill SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=11h"CDTSR",INT 2D/AL=12h"CDTSR" --------U-2D--13----------------------------- INT 2D - FREEVER - SET VERSION NUMBERS AL = 13h AH = AMIS multiplex number for FREEVER 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: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=17h"FREEVER" --------U-2D--14----------------------------- INT 2D - FREEVER - ENABLE TSR AL = 14h AH = AMIS multiplex number for FREEVER Return: AL = FFh if successful SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=16h"FREEVER" --------U-2D--15----------------------------- INT 2D - FREEVER - DISABLE TSR AL = 15h AH = AMIS multiplex number for FREEVER Return: AL = FFh if successful SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=16h"FREEVER" --------U-2D--16----------------------------- INT 2D - FREEVER - GET TSR STATUS AL = 16h AH = AMIS multiplex number for FREEVER Return: AL = FFh if successful BL = status 01h resident and active 02h resident and inactive SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=17h"FREEVER" --------U-2D--17----------------------------- INT 2D - FREEVER - GET TaskMAX STATUS AT INSTALLATION AL = 17h AH = AMIS multiplex number for FREEVER Return: AL = FFh if successful BL = status 00h if TaskMAX not loaded before SETDRVER FFh if TaskMAX was loaded before SETDRVER Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar to SETVER for any DOS-compatible OS, written by Matthias Paul SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=16h"FREEVER" --------U-2D--20----------------------------- INT 2D - DTown Utilities v1.40+ - GET POP-UP HANDLER ADDRESS AL = 20h Return: AL = FFh if available DX:DI -> DTU popup-handler Program: DTown Utilities is a freeware programmer's utility TSR by Jeroen van Disseldorp Note: this function is only available if the extended API has been installed in the resident portion SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=21h,INT 2D/AL=50h,INT 2D/AL=51h SeeAlso: INT 03"DTown" --------U-2D--21----------------------------- INT 2D - DTown Utilities v1.40+ - POP UP AL = 21h BL = which utility to bring up 00h active utility 01h help screen 0Ah ASCII table 0Bh memory view 0Ch CPU status 0Dh calculator 0Eh miscellaneous 0Fh file viewer 10h disassembler Return: AL = status 00h already active FFh popped up successfully BX = 0000h Note: this function is only available if the extended API has been installed in the resident portion SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h --------U-2D--50----------------------------- INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET ADDRESS AL = 50h CX:DX = new address for start of memory view utility's display Note: this function is only available if the extended API has been installed in the resident portion Return: AL = FFh if supported SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=21h,INT 2D/AL=51h --------U-2D--51----------------------------- INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET REFERENCE AL = 51h BL = reference ("bookmark") number CX:DX = new address for reference Return: AL = status 00h invalid index FFh reference set Note: this function is only available if the extended API has been installed in the resident portion Program: DTown Utilities is a shareware programmer's utility TSR by Jeroen van Disseldorp SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h --------b-2D--DC----------------------------- INT 2D C - DAISY.SYS - BROADCAST: CHAIN RESCANNED AL = DCh AH = AMIS multiplex number for signature 'DAISYCHA' 'INDRIVER' DL = LPT Port Rescanned Program: DAISY.SYS is a daisy chain manager for parallel port peripherals conforming to the IEEE 1284.3 Committee's daisy chain specification. Desc: This Broadcast is sent whenever daisy chain IDs are reassigned to warn parallel port device drivers that their daisy chain ID may have been changed. Note: This function is a callout from DAISY.SYS, NOT a call into DAISY.SYS SeeAlso: INT 17/AX=0200h"Enhanced Parallel Port",#0530,#1905 --------l-2E--------------------------------- INT 2E U - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION DS:SI -> commandline to execute (see #1920) Return: all registers except CS:IP destroyed AX = status (4DOS v4.0) 0000h successful FFFFh error before processing command (not enough memory, etc) other error number returned by command Notes: this call allows execution of arbitrary commands (including COMMAND.COM internal commands) without loading another copy of COMMAND.COM if COMMAND.COM is the user's command interpreter, the primary copy executes the command; this allows the master environment to be modified by issuing a "SET" command, but changes in the master environment will not become effective until all programs descended from the primary COMMAND.COM terminate since COMMAND.COM processes the string as if typed from the keyboard, the transient portion needs to be present, and the calling program must ensure that sufficient memory to load the transient portion can be allocated by DOS if necessary results are unpredictable if invoked by a program run from a batch file because this call is not reentrant and COMMAND.COM uses the same internal variables when processing a batch file hooked but ignored by 4DOS v3.0 COMMAND.COM replacement unless SHELL2E has been loaded the MS-DOS 5 Programmer's Reference calls this "Reload Transient" Format of DOS commandline: Offset Size Description (Table 1920) 00h BYTE length of command string, not counting trailing CR 01h var command string N BYTE 0Dh (CR) --------O-2E--------------------------------- INT 2E UP - Windows NT - NATIVE API EAX = function number EDX = address of parameter block Return: ??? --------l-2E----BXE22E----------------------- INT 2E - 4DOS v2.x-3.03 SHELL2E.COM - UNINSTALL BX = E22Eh DS:SI -> zero byte Return: if successful, SHELL2E terminates itself with INT 21/AH=4Ch ----------2F--------------------------------- INT 2F - Multiplex - NOTES AH = identifier of program which is to handle the interrupt 00h-7Fh reserved for DOS B8h-BFh reserved for networks C0h-FFh reserved for applications AL is the function code This is a general mechanism for verifying the presence of a TSR and communicating with it. When searching for a free identifier code for AH using the installation check (AL=00h), the calling program should set BX/CX/DX to 0000h and must not depend on any registers other than CS:IP and SS:SP to be valid on return, since numerous programs now use additional registers on input and/or output for the installation check. Notes: Since the multiplex chain is growing so long, and beginning to experience multiplex number collisions, I have proposed an alternate multiplex interrupt on INT 2D. If you decide to use the alternate multiplex, please let me know. DOS and some other programs return values in the flags register, so any TSR which chains by calling the previous handler rather than jumping to it should ensure that the returned flags are preserved and passed back to the original caller SeeAlso: INT 2D"ALTERNATE MULTIPLEX" --------t-2F--------------------------------- INT 2F - BMB Compuscience Canada Utilities Interface - INSTALLATION CHECK AH = xx (dynamically assigned based upon a search for a multiplex number which doesn't answer installed) AL = 00h installation check ES:DI = EBEBh:BEBEh Return: AL = 00h not installed 01h not installed, not OK to install FFh installed; if ES:DI was EBEBh:BEBEh on entry, ES:DI will point to a string of the form 'MMMMPPPPPPPPvNNNN' where MMMM is a short form of the manufacturer's name, PPPPPPPP is a product name and NNNN is the product's version number --------t-2F--------------------------------- INT 2F - Ross Wentworth's Turbo Pascal POPUP LIBRARY AH = programmer-selected multiplex number AL = function 00h installation check Return: AL = FFh if installed 01h get TSR interrupt vectors Return: DX:AX -> vector table (see #1921) 02h get TSR code segment Return: AX = code segment for all interrupt handlers 03h call user exit routine and release TSR's memory 04h get signature string Return: DX:AX -> counted string containing signature 05h get TSR's INT 2F handler Return: DX:AX -> INT 2F handler 06h enable/disable TSR BL = new state (00h disabled, 01h enabled) 07h activate TSR (popup if not disabled) 08h get hotkeys BL = which hotkey (00h = hotkey 1, 01h = hotkey 2) Return: AX = hotkey (AH = keyflags, AL = scancode) 09h set hotkey BL = which hotkey (00h = hotkey 1, 01h = hotkey 2) CX = new hotkey (CH = keyflags, CL = scancode) 0Ah-1Fh reserved Index: installation check;Ross Wentworth POPUP library Index: hotkeys;Ross Wentworth POPUP library Format of POPUP vector table entry: Offset Size Description (Table 1921) 00h BYTE vector number (00h = end of table) 01h DWORD original vector 05h WORD offset of interrupt handler in TSR's code segment --------t-2F--------------------------------- INT 2F - CiriSOFT Spanish University of Valladolid TSR's Interface AH = xx (dynamically assigned based upon a search for a multiplex number from C0h to FFh which doesn't answer installed) AL = 00h installation check ES:DI = 1492h:1992h Return: AL = 00h not installed 01h not installed, not OK to install FFh installed; and if ES:DI was 1492h:1992h on entry, ES:DI will point to author_name_ver table (see #1922) AH = FFh Note: this interface permits advanced communication with TSRs: it is possible to make a generic uninstall utility, advanced TSR relocator programs in order to fit fragmented memory areas, etc. See also: INT 2D"AMIS",INT 2F"Compuscience" Index: installation check;CiriSOFT TSR interface Index: uninstall;CiriSOFT TSR interface Format of CiriSOFT author_name_ver table: Offset Size Description (Table 1922) -16 WORD segment of the start of the resident TSR code (CS in programs with PSP, XMS upper memory segment if installed as UMB...) -14 WORD offset of the start of the resident TSR code (frequently 100h in *.COM programs and 0 in upper memory TSR's). -12 WORD memory used by TSR (in paragraphs). Knowing the memory area used by TSR is possible to determine if hooked vectors are still pointing it (and if it is safe to uninstall). -10 BYTE characteristics byte (see #1923) -9 BYTE number of multiplex entry used (redefinition available). Note that the TSR must use THIS variable in it's INT 2Fh handler. -8 WORD offset to vector_area table (see #1924) -6 WORD offset to extra_area table (see #1925,#1923 [bit 7]) -4 4 BYTEs signature string "*##*" 00h var "AUTHOR:PROGRAM_NAME:VERSION",0 (variable length, this area is used in order to determine if the TSR is already resident and it's version code; the ':' char is used as delimiter) Bitfields for CiriSOFT characteristics byte: Bit(s) Description (Table 1923) 0-2 type 000 normal program (with PSP) 001 upper XMS memory block (needed HIMEM.SYS function to free memory when uninstalling) 010 device driver (*.SYS) 011 device driver in EXE format 1xx others (reserved) 3-6 reserved 7 set if extra_table defined and supported (see #1925) SeeAlso: #1922 Format of CiriSOFT vector_area table: Offset Size Description (Table 1924) -1 BYTE number of vectors intercepted by TSR 00h BYTE first vector number 01h DWORD first vector pointer before installing the TSR 05h BYTE second vector number 06h DWORD second vector pointer before installing the TSR 0Ah ... (and so on) Note: the TSR must use these variables to invoke the previous interrupt handler routines SeeAlso: #1922 Format of extra_area table (needed only to improve relocation feature): Offset Size Description (Table 1925) 00h WORD offset to external_ctrl table (see #1926) 0000h if not supported 02h WORD reserved for future use (0) SeeAlso: #1922 Format of CiriSOFT external_ctrl table: Offset Size Description (Table 1926) 00h BYTE bit 0: TSR is relocatable (no absolute segment references) 01h WORD offset to a variable which can activate/inhibit the TSR ---And if bit 0 in offset 00h is off: 03h DWORD pointer to ASCIZ pathname for executable file which supports /SR parameter (silent installation & inhibit) 07h DWORD pointer to first variable to initialize on the copy reloaded from the previous TSR still resident 0Bh DWORD pointer to last variable (all variables packed in one block) --------c-2F00------------------------------- INT 2F U - DOS 2.x only PRINT.COM - ??? AH = 00h ??? Return: ??? Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler values in AH other than 00h or 01h cause PRINT to return the number of files in the queue in AH SeeAlso: AH=01h --------P-2F00------------------------------- INT 2F U - PSPRINT - PRINT JOB CONTROL AH = 00h ??? Return: ??? --------c-2F0080----------------------------- INT 2F - DOS 3.1+ PRINT - GIVE PRINT A TIME SLICE AX = 0080h Return: after PRINT executes Notes: PRINT returns AL=01h if AH=00h but AL is not 80h on entry this function is not supported by the Novell DOS 7 PRINT.COM --------N-2F00D8----------------------------- INT 2F - Personal NetWare - VLM - ??? AX = 00D8h ??? Return: ??? Note: hooked by one of the .VLMs loaded by VLM.EXE v1.10, but apparently a NOP --------c-2F01------------------------------- INT 2F U - DOS 2.x only PRINT.COM - ??? AH = 01h ??? Return: ??? Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler values in AH other than 00h or 01h cause PRINT to return the number of files in the queue in AH SeeAlso: AH=00h --------c-2F0100----------------------------- INT 2F - DOS 3.0+ PRINT - INSTALLATION CHECK AX = 0100h Return: AL = status 00h not installed 01h not installed, but not OK to install FFh installed AH = 00h (Novell DOS 7) SeeAlso: AX=0101h --------c-2F0100SI20D6----------------------- INT 2F U - PrintCache 3.1 PRINT.COM - INSTALLATION CHECK AX = 0100h SI = 20D6h DI = 8761h Return: AX = 00FFh if installed DI = 0001h if PrintCache's PRINT.COM installed and magic values match SI = resident code segment Program: PrintCache PRINT.COM is a DOS PRINT replacement included in LaserTools' PrintCache memory/disk-based print spooler package Note: if either of SI or DI differ from the indicated magic values, only AX will be modified on return, for compatibility with DOS PRINT SeeAlso: AX=0101h/SI=20D6h,AX=C000h"PCACHE" --------c-2F0101----------------------------- INT 2F - DOS 3.0+ PRINT - SUBMIT FILE FOR PRINTING AX = 0101h DS:DX -> submit packet (see #1927) Return: CF clear if successful AL = status 01h added to queue 9Eh now printing CF set on error AX = error code (see #1928,#1020 at INT 21/AH=59h/BX=0000h) SeeAlso: AX=0102h Format of PRINT submit packet: Offset Size Description (Table 1927) 00h BYTE level (must be 00h) 01h DWORD pointer to ASCIZ filename (no wildcards) (Table 1928) Values for PRINT error code: 0001h invalid function 0002h file not found 0003h path not found 0004h out of file handles 0005h access denied 0008h print queue full 0009h spooler busy 000Ch name too long 000Fh invalid drive --------c-2F0101SI20D6----------------------- INT 2F U - PrintCache v3.1 PRINT.COM - SUBMIT FILE FOR PRINTING AX = 0101h SI = 20D6h DI = 8761h DS:DX -> submit packet (see #1927) CL = print options bit 4: use default options Return: CF clear if successful AL = status 01h added to queue 9Eh now printing CF set on error AX = error code (see #1928) Program: PrintCache PRINT.COM is a DOS PRINT replacement included in LaserTools' PrintCache memory/disk-based print spooler package Note: if either SI or DI differs from the indicated magic values on entry, PrintCache will use the default print options for the file for compatibility with DOS PRINT SeeAlso: AX=0100h/SI=20D6h,AX=0101h,AX=0107h"PrintCache" --------c-2F0102----------------------------- INT 2F - DOS 3.0+ PRINT - REMOVE FILE FROM PRINT QUEUE AX = 0102h DS:DX -> ASCIZ filename (wildcards allowed) Return: CF clear if successful CF set on error AX = error code (see #1928) SeeAlso: AX=0101h,AX=0103h --------c-2F0103----------------------------- INT 2F - DOS 3.0+ PRINT - CANCEL ALL FILES IN PRINT QUEUE AX = 0103h Return: CF clear if successful CF set on error AX = error code (see #1928) SeeAlso: AX=0102h --------c-2F0104----------------------------- INT 2F - DOS 3.0+ PRINT - FREEZE PRINT QUEUE TO READ JOB STATUS AX = 0104h Return: CF clear if successful DX = error count since status last read DS:SI -> print queue CF set on error AX = error code (see #1928) Desc: get the list of print jobs, temporarily suspending PRINT's activities to avoid changing the list while it is being examined Notes: the print queue is an array of 64-byte ASCIZ filenames terminated by an empty filename; the first name is the file currently being printed printing is stopped until AX=0105h is called to prevent the queue from changing while the filenames are being read SeeAlso: AX=0101h,AX=0105h --------c-2F0105----------------------------- INT 2F - DOS 3.0+ PRINT - RESTART PRINT QUEUE AFTER STATUS READ AX = 0105h Return: CF clear if successful CF set on error AX = error code (see #1928) Desc: restart PRINT's activities once an application finishes examining the print queue SeeAlso: AX=0104h --------c-2F0106----------------------------- INT 2F - DOS 3.3+ PRINT - GET PRINTER DEVICE AX = 0106h Return: CF set if files in print queue AX = error code 0008h (queue full) DS:SI -> device driver header (see #0987) CF clear if print queue empty AX = 0000h Desc: determine which device, if any, PRINT is currently using for output Notes: undocumented prior to the release of MS-DOS 5.0 this function can be used to allow a program to avoid printing to the printer on which PRINT is currently performing output SeeAlso: AX=0104h --------c-2F0107----------------------------- INT 2F U - PrintCache v3.1 PRINT.COM - SET TRAILING FORM FEEDS AX = 0107h CL bit 0: output form feed between print jobs Return: AL destroyed SeeAlso: AX=0100h/SI=20D6h,AX=0101h/SI=20D6h --------N-2F0200----------------------------- INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - INSTALLATION CHECK AX = 0200h Return: AL = FFh if installed Desc: determine whether the PC LAN Program redirector is installed SeeAlso: AX=0201h,AX=0203h --------N-2F0201----------------------------- INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ??? AX = 0201h Return: nothing??? Notes: this function is called by the DOS 3.3+ PRINT.COM AX=0202h appears to be the opposite function these functions are supposedly used to signal opening and closing of printers SeeAlso: AX=0202h --------N-2F0202----------------------------- INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ??? AX = 0202h ??? Return: nothing??? Notes: this function is called by the DOS 3.3+ PRINT.COM these functions are supposedly used to signal opening and closing of printers SeeAlso: AX=0201h --------N-2F0203----------------------------- INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ??? AX = 0203h Return: nothing??? Notes: this function is called by the DOS 3.3+ PRINT.COM AX=0204h appears to be the opposite function these functions are supposedly used to signal opening and closing of printers SeeAlso: AX=0200h,AX=0204h --------N-2F0204----------------------------- INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ??? AX = 0204h ??? Return: nothing??? Notes: this function is called by the DOS 3.3+ PRINT.COM AX=0203h appears to be the opposite function these functions are supposedly used to signal opening and closing of printers SeeAlso: AX=0200h,AX=0203h --------N-2F--------------------------------- INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ??? AX = 02xxh ??? Return: ??? --------l-2F0500----------------------------- INT 2F U - DOS 3.0+ CRITICAL ERROR HANDLER - INSTALLATION CHECK AX = 0500h Return: AL = 00h not installed, OK to install 01h not installed, can't install FFh installed Desc: determine whether a critical error message override is installed Note: this set of functions allows a user program to partially or completely override the default critical error handler's message in COMMAND.COM SeeAlso: AH=05h,INT 24 --------l-2F05------------------------------- INT 2F CU - DOS 3.0+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING AH = 05h ---DOS 3.x--- AL = extended error code (not zero) ---DOS 4.0+ --- AL = error type 01h DOS extended error code 02h parameter error BX = error code Return: CF clear if successful ES:DI -> ASCIZ error message (read-only) AL = completion state 00h message requires completion with device name, drive, etc. 01h message is complete as returned CF set if error code can't be converted to string AX,DI,ES destroyed other flags corrupted Notes: called at start of COMMAND.COM's default critical error handler if installed by a user program, allowing partial or complete overriding of the default error messages subfunction 02h is called by many DOS 4 external programs DR DOS's COMMAND.COM appends additional info ("0 files copied") to the returned string SeeAlso: AX=0500h,AX=122Eh,INT 24 --------U-2F0600----------------------------- INT 2F - DOS 3.0+ ASSIGN - INSTALLATION CHECK AX = 0600h Return: AL = status 00h not installed 01h not installed, but not OK to install FFh installed Notes: ASSIGN is not a TSR in DR DOS 5.0; it is internally replaced by SUBST (see INT 21/AH=52h) undocumented prior to the release of DOS 5.0 SeeAlso: AX=0601h,INT 21/AH=52h --------U-2F0601----------------------------- INT 2F U - DOS 3.0+ ASSIGN - GET DRIVE ASSIGNMENT TABLE AX = 0601h Return: ES = segment of ASSIGN work area and assignment table Note: the 26 bytes starting at ES:0103h specify which drive each of A: to Z: is mapped to. Initially set to 01h 02h 03h.... SeeAlso: AX=0600h,AX=AF14h"WinDOS" --------D-2F0800----------------------------- INT 2F U - DRIVER.SYS support - INSTALLATION CHECK AX = 0800h Return: AL = status 00h not installed, OK to install 01h not installed, not OK to install FFh installed Desc: determine whether the internal support code used by DRIVER.SYS is present; it is always present in DOS 3.2+ Note: supported by DR DOS 5.0 and Novell DOS 7 --------D-2F0801----------------------------- INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE AX = 0801h DS:DI -> drive data table (see #1935,#1936,#1937) Return: AX,BX,SI,ES destroyed Notes: moves down internal list of drive data tables, copying and modifying the drive description flags word for tables referencing same physical drive the data table is appended to the chain of tables supported by DR DOS 5.0 and Novell DOS 7 SeeAlso: AX=0803h --------D-2F0802----------------------------- INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST AX = 0802h ES:BX -> device driver request header (see #1931) Return: request header updated as per requested operation Notes: supported by DR DOS 5.0 DOS 3.2 executes this function on any AL value from 02h through F7h; DOS 4.0+ executes this function on AL=02h and AL=04h-F7h the command codes (see #1929) and structures described below apply to all drivers which support the appropriate commands; this call is just one of a number of ways in which a device driver request may be invoked this call reportedly leaves one word on the stack under MS-DOS 6.2, so the stack pointer should be saved and restored around the call to this function supported by Novell DOS 7 SeeAlso: AX=0800h,AX=0801h,AX=0803h,AX=1510h,INT 21/AH=52h,INT 21/AH=99h SeeAlso: INT 21/AH=9Ah (Table 1929) Values for device driver command code: 00h INIT 01h MEDIA CHECK (block devices) 02h BUILD BPB (block devices) 03h IOCTL INPUT 04h INPUT 05h NONDESTRUCTIVE INPUT, NO WAIT (character devices) 06h INPUT STATUS (character devices) 07h INPUT FLUSH (character devices) 08h OUTPUT 09h OUTPUT WITH VERIFY 0Ah OUTPUT STATUS (character devices) 0Bh OUTPUT FLUSH (character devices) 0Ch IOCTL OUTPUT 0Dh (DOS 3.0+) DEVICE OPEN 0Eh (DOS 3.0+) DEVICE CLOSE 0Fh (DOS 3.0+) REMOVABLE MEDIA (block devices) 10h (DOS 3.0+) OUTPUT UNTIL BUSY (character devices) 11h (European MS-DOS 4.0) STOP OUTPUT (console screen drivers only) 12h (European MS-DOS 4.0) RESTART OUTPUT (console screen drivers only) 13h (DOS 3.2+) GENERIC IOCTL 14h unused 15h (European MS-DOS 4.0) RESET UNCERTAIN MEDIA FLAG 16h unused 17h (DOS 3.2+) GET LOGICAL DEVICE 18h (DOS 3.2+) SET LOGICAL DEVICE 19h (DOS 5.0+) CHECK GENERIC IOCTL SUPPORT 80h (CD-ROM) READ LONG 81h (CD-ROM) reserved 82h (CD-ROM) READ LONG PREFETCH 83h (CD-ROM) SEEK 84h (CD-ROM) PLAY AUDIO 85h (CD-ROM) STOP AUDIO 86h (CD-ROM) WRITE LONG 87h (CD-ROM) WRITE LONG VERIFY 88h (CD-ROM) RESUME AUDIO Bitfields for device request status: Bit(s) Description (Table 1930) 15 error 14-11 reserved 10 ??? set by DOS kernel on entry to some driver calls 9 busy 8 done (may be clear on return under European MS-DOS 4.0) 7-0 error code if bit 15 set (see #1932) Format of device driver request header: Offset Size Description (Table 1931) 00h BYTE length of request header 01h BYTE subunit within device driver 02h BYTE command code (see #1929) 03h WORD status (filled in by device driver) (see #1930) ---DOS--- 05h 4 BYTEs reserved (unused in DOS 2.x and 3.x) 09h DWORD (European MS-DOS 4.0 only) pointer to next request header in device's request queue (other versions) reserved (unused in DOS 2.x and 3.x) ---STARLITE architecture--- 05h DWORD pointer to next request header 09h 4 BYTEs reserved ---command code 00h--- 0Dh BYTE (ret) number of units 0Eh DWORD (call) pointer to DOS device helper function (see #1933) (European MS-DOS 4.0 only) (call) pointer past end of memory available to driver (DOS 5+) (ret) address of first free byte following driver 12h DWORD (call) pointer to commandline arguments (ret) pointer to BPB array (block drivers) or 0000h:0000h (character drivers) 16h BYTE (DOS 3.0+) drive number for first unit of block driver (0=A) ---European MS-DOS 4.0--- 17h DWORD pointer to function to save registers on stack ---DOS 5+ --- 17h WORD (ret) error-message flag 0001h MS-DOS should display error msg on init failure ---command code 01h--- 0Dh BYTE media descriptor 0Eh BYTE (ret) media status 00h don't know 01h media has not changed FFh media has been changed 0Fh DWORD (ret, DOS 3.0+) pointer to previous volume ID if the OPEN/CLOSE/RM bit in device header is set and disk changed ---command code 02h--- 0Dh BYTE media descriptor 0Eh DWORD transfer address -> scratch sector if NON-IBM FORMAT bit in device header set -> first FAT sector otherwise 12h DWORD pointer to BPB (set by driver) (see #1004 at INT 21/AH=53h) ---command codes 03h,0Ch--- (see also INT 21/AX=4402h"DOS 2+",INT 21/AX=4403h"DOS") 0Dh BYTE media descriptor (block devices only) 0Eh DWORD transfer address 12h WORD (call) number of bytes to read/write (ret) actual number of bytes read or written ---command codes 04h,08h,09h (except Compaq DOS 3.31, DR DOS 6)--- 0Dh BYTE media descriptor (block devices only) 0Eh DWORD transfer address 12h WORD byte count (character devices) or sector count (block devices) 14h WORD starting sector number (block devices only) 16h DWORD (DOS 3.0+) pointer to volume ID if error 0Fh returned 1Ah DWORD (DOS 4.0+) 32-bit starting sector number (block devices with device attribute word bit 1 set only) if starting sector number above is FFFFh (see INT 21/AH=52h) ---command codes 04h,08h,09h (Compaq DOS 3.31, DR DOS 6)--- 0Dh BYTE media descriptor (block devices only) 0Eh DWORD transfer address 12h WORD byte count (character devices) or sector count (block devices) 14h DWORD 32-bit starting sector number (block devices only) Note: to reliably determine which variant of the request block for functions 04h,08h,09h has been passed to the driver, check the length field as well as the word at offset 14h. If the length is 1Eh and 14h=FFFFh, use the DWORD at 1Ah as the starting sector number; if the length is 18h, use the DWORD at 14h; otherwise, use the WORD at 14h. ---command code 05h--- 0Dh BYTE byte read from device if BUSY bit clear on return ---command codes 06h,07h,0Ah,0Bh,0Dh,0Eh,0Fh--- no further fields ---command code 10h--- 0Dh BYTE unused 0Eh DWORD transfer address 12h WORD (call) number of bytes to write (ret) actual number of bytes written ---command codes 11h,12h--- 0Dh BYTE reserved ---command code 15h--- no further fields ---command codes 13h,19h--- 0Dh BYTE category code 00h unknown 01h COMn: 03h CON 05h LPTn: 07h mouse (European MS-DOS 4.0) 08h disk 9Eh (STARLITE) Media Access Control driver 0Eh BYTE function code 00h (STARLITE) MAC Bind request 0Fh WORD copy of DS at time of IOCTL call (apparently unused in DOS 3.3) SI contents (European MS-DOS 4.0) 11h WORD offset of device driver header (see #0987) DI contents (European MS-DOS 4.0) 13h DWORD pointer to parameter block from INT 21/AX=440Ch or AX=440Dh ---command codes 80h,82h--- 0Dh BYTE addressing mode 00h HSG (default) 01h Phillips/Sony Red Book 0Eh DWORD transfer address (ignored for command 82h) 12h WORD number of sectors to read (if 0 for command 82h, request is an advisory seek) 14h DWORD starting sector number logical sector number in HSG mode frame/second/minute/unused in Red Book mode (HSG sector = minute * 4500 + second * 75 + frame - 150) 18h BYTE data read mode 00h cooked (2048 bytes per frame) 01h raw (2352 bytes per frame, including EDC/ECC) 19h BYTE interleave size (number of sectors stored consecutively) 1Ah BYTE interleave skip factor (number of sectors between consecutive portions) ---command code 83h--- 0Dh BYTE addressing mode 00h HSG (default) 01h Phillips/Sony Red Book 0Eh DWORD transfer address (ignored) 12h WORD number of sectors to read (ignored) 14h DWORD starting sector number (see also above) ---command code 84h--- 0Dh BYTE addressing mode 00h HSG (default) 01h Phillips/Sony Red Book 0Eh DWORD starting sector number (see also above) 12h DWORD number of sectors to play ---command codes 85h,88h--- no further fields ---command codes 86h,87h--- 0Dh BYTE addressing mode 00h HSG (default) 01h Phillips/Sony Red Book 0Eh DWORD transfer address (ignored in write mode 0) 12h WORD number of sectors to write 14h DWORD starting sector number (also see above) 18h BYTE write mode 00h mode 0 (write all zeros) 01h mode 1 (default) (2048 bytes per sector) 02h mode 2 form 1 (2048 bytes per sector) 03h mode 2 form 2 (2336 bytes per sector) 19h BYTE interleave size (number of sectors stored consecutively) 1Ah BYTE interleave skip factor (number of sectors between consecutive portions) (Table 1932) Values for device driver error code: 00h write-protect violation 01h unknown unit 02h drive not ready 03h unknown command 04h CRC error 05h bad drive request structure length 06h seek error 07h unknown media 08h sector not found 09h printer out of paper 0Ah write fault 0Bh read fault 0Ch general failure 0Dh reserved 0Eh (CD-ROM) media unavailable 0Fh invalid disk change (Table 1933) Call European MS-DOS 4.0 device helper function with: DL = function 00h "SchedClock" called on each timer tick AL = tick interval in milliseconds 01h "DevDone" device I/O complete ES:BX -> request header Note: must update status word first; may be called from an interrupt handler 02h "PullRequest" pull next request from queue DS:SI -> DWORD pointer to start of device's request queue Return: ZF clear if pending request ES:BX -> request header ZF set if no more requests 03h "PullParticular" remove specific request from queue DS:SI -> DWORD pointer to start of device's request queue ES:BX -> request header Return: ZF set if request header not found 04h "PushRequest" push the request onto the queue DS:SI -> DWORD pointer to start of device's request queue ES:BX -> request header interrupts disabled 05h "ConsInputFilter" keyboard input check AX = character (high byte 00h if PC ASCII character) Return: ZF set if character should be discarded ZF clear if character should be handled normally Note: called by keyboard interrupt handler so DOS can scan for special input characters 06h "SortRequest" push request in sorted order by starting sector DS:SI -> DWORD pointer to start of device's request queue ES:BX -> request header interrupts disabled 07h "SigEvent" send signal on keyboard event AH = event identifier Return: AL,FLAGS destroyed 09h "ProcBlock" block on event AX:BX = event identifier (typically a pointer) CX = timeout in ms or 0000h for never DH = interruptable flag (nonzero if pause may be interrupted) interrupts disabled Return: after corresponding ProcRun call CF clear if event wakeup, set if unusual wakeup ZF set if timeout wakeup, clear if interrupted AL = wakeup code, nonzero if unusual wakeup interrupts enabled BX,CX,DX destroyed Note: block process and schedules another to run 0Ah "ProcRun" unblock process AX:BX = event identifier (typically a pointer) Return: AX = number of processes awakened ZF set if no processes awakened BX,CX,DX destroyed 0Bh "QueueInit" initialize/clear character queue DS:BX -> character queue structure (see #1934) Note: the queue size field must be set before calling 0Dh "QueueWrite" put a character in the queue DS:BX -> character queue (see #1934) AL = character to append to end of queue Return: ZF set if queue is full ZF clear if character stored 0Eh "QueueRead" get a character from the queue DS:BX -> character queue (see #1934) Return: ZF set if queue is empty ZF clear if characters in queue AL = first character in queue 10h "GetDOSVar" return pointer to DOS variable AL = index of variable 03h current process ID BX = index into variable if AL specifies an array CX = expected length of variable Return: CF clear if successful DX:AX -> variable CF set on error AX,DX destroyed BX,CX destroyed Note: the variables may not be modified 14h "Yield" yield CPU if higher-priority task ready to run Return: FLAGS destroyed 1Bh "CritEnter" begin system critical section DS:BX -> semaphore (6 BYTEs, initialized to zero) Return: AX,BX,CX,DX destroyed 1Ch "CritLeave" end system critical section DS:BX -> semaphore (6 BYTEs, initialized to zero) Return: AX,BX,CX,DX destroyed Note: must be called in the context of the process which called CritEnter on the semaphore Note: the DWORD pointing at the request queue must be allocated by the driver and initialized to 0000h:0000h. It always points at the next request to be executed Format of European MS-DOS 4.0 character queue: Offset Size Description (Table 1934) 00h WORD size of queue in bytes 02h WORD index of next character out 04h WORD count of characters in the queue 06h N BYTEs queue buffer --------D-2F0803----------------------------- INT 2F U - DOS 4.0+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST AX = 0803h Return: DS:DI -> first drive data table in list (see #1935,#1936,#1937) Note: not available under DR DOS 5.0, but supported by Novell DOS 7 (using the MS-DOS 4+ data table format) SeeAlso: AX=0801h Format of DOS 3.30 drive data table: Offset Size Description (Table 1935) 00h DWORD pointer to next table (offset FFFFh if last table) 04h BYTE physical unit number (for INT 13) 05h BYTE logical drive number (0=A:) 06h 19 BYTEs BIOS Parameter Block (see also INT 21/AH=53h) Offset Size Description 00h WORD bytes per sector 02h BYTE sectors per cluster, FFh if unknown 03h WORD number of reserved sectors 05h BYTE number of FATs 06h WORD number of root dir entries 08h WORD total sectors 0Ah BYTE media descriptor, 00h if unknown 0Bh WORD sectors per FAT 0Dh WORD sectors per track 0Fh WORD number of heads 11h WORD number of hidden sectors 19h BYTE flags bit 6: 16-bit FAT instead of 12-bit FAT 1Ah WORD number of DEVICE OPEN calls without corresponding DEVICE CLOSE 1Ch 11 BYTEs volume label or "NO NAME " if none (always "NO NAME" for fixed media) 27h BYTE terminating null for volume label??? 28h BYTE device type (see #0903 at INT 21/AX=440Dh"DOS 3.2+") 29h WORD bit flags describing drive (see #1938) 2Bh WORD number of cylinders 2Dh 19 BYTEs BIOS Parameter Block for highest capacity supported 40h 3 BYTEs ??? 43h 9 BYTEs filesystem type???, default = "NO NAME " (apparently only MS-DOS 3.30 fixed media, nulls for removable media and PC-DOS 3.30) 4Ch BYTE least-significant byte of last-accessed cylinder number ---removable media--- 4Dh DWORD time of last access in clock ticks (FFFFFFFFh if never) ---fixed media--- 4Dh WORD partition (FFFFh = primary, 0001h = extended) 4Fh WORD absolute cylinder number of partition's start on physical drive (always FFFFh if primary partition) SeeAlso: #1936,#1937 Format of COMPAQ DOS 3.31 drive data table: Offset Size Description (Table 1936) 00h DWORD pointer to next table (offset FFFFh if last table) 04h BYTE physical unit number (for INT 13) 05h BYTE logical drive number (0=A:) 06h 25 BYTEs BIOS Parameter Block (see #1937) 1Fh 6 BYTEs reserved fields from BPB above??? 25h BYTE flags bit 6: 16-bit FAT instead of 12-bit FAT bit 5: large volume??? 26h WORD device-open count??? 28h 11 BYTEs volume label or "NO NAME " if none (always "NO NAME" for fixed media) 33h BYTE terminating null for volume label 34h BYTE device type (see #0903 at INT 21/AX=440Dh"DOS 3.2+") 35h WORD bit flags describing drive (see #1938) 37h WORD number of cylinders 39h 25 BYTEs BIOS parameter block for highest capacity drive supports 52h 6 BYTEs ??? apparently always zeros 58h BYTE least-significant byte of last-accessed cylinder number ---removable media--- 59h DWORD time of last access in clock ticks (FFFFFFFFh if never) ---fixed media--- 59h WORD partition (FFFFh = primary, 0001h = extended) 5Bh WORD absolute cylinder number of partition's start on physical drive (always FFFFh if primary partition) SeeAlso: #1935,#1937 Format of DOS 4.0-6.0 drive data table: Offset Size Description (Table 1937) 00h DWORD pointer to next table (offset FFFFh if last table) 04h BYTE physical unit number (for INT 13) 05h BYTE logical drive number (0=A:) 06h 25 BYTEs BIOS Parameter Block (see also INT 21/AH=53h) Offset Size Description 00h WORD bytes per sector 02h BYTE sectors per cluster, FFh if unknown 03h WORD number of reserved sectors 05h BYTE number of FATs 06h WORD number of root dir entries 08h WORD total sectors (refer to offset 15h if zero) 0Ah BYTE media descriptor, 00h if unknown 0Bh WORD sectors per FAT 0Dh WORD sectors per track 0Fh WORD number of heads 11h DWORD number of hidden sectors 15h DWORD total sectors if WORD at 08h is zero 1Fh BYTE flags bit 6: 16-bit FAT instead of 12-bit bit 7: unsupportable disk (all accesses will return Not Ready) 20h WORD device-open count 22h BYTE device type (see #0903 at INT 21/AX=440Dh"DOS 3.2+") 23h WORD bit flags describing drive (see #1938) 25h WORD number of cylinders (for partition only, if hard disk) 27h 25 BYTEs BIOS Parameter Block for default (highest) capacity supported 40h 6 BYTEs reserved (part of BPB above) 46h BYTE last track accessed ---removable media--- 47h DWORD time of last access in clock ticks (FFFFFFFFh if never) ---fixed media--- 47h WORD partition (FFFFh = primary, 0001h = extended) always 0001h for DOS 5+ 49h WORD absolute cylinder number of partition's start on physical drive (FFFFh if primary partition in DOS 4.x) ------ 4Bh 11 BYTEs volume label or "NO NAME " if none (apparently taken from extended boot record rather than root directory) 56h BYTE terminating null for volume label 57h DWORD serial number 5Bh 8 BYTEs filesystem type ("FAT12 " or "FAT16 ") 63h BYTE terminating null for filesystem type SeeAlso: #1935,#1936 Bitfields for flags describing drive: Bit(s) Description (Table 1938) 0 fixed media 1 door lock ("changeline") supported 2 current BPB locked 3 all sectors in a track are the same size 4 physical drive has multiple logical units 5 current logical drive for shared physical drive 6 disk change detected 7 device parameters were changed (set DASD before formatting) (see #0902 at INT 21/AX=440Dh"DOS 3.2+") 8 disk reformatted (BPB of current media was changed) 9 access flag (fixed media only, disables reads and writes) (see #0908 at INT 21/AX=440Dh"DOS 3.2+") --------f-2F1000----------------------------- INT 2F - SHARE - INSTALLATION CHECK AX = 1000h Return: AL = status 00h not installed, OK to install 01h not installed, not OK to install FFh installed BUGS: values of AL other than 00h put DOS 3.x SHARE into an infinite loop (08E9: OR AL,AL 08EB: JNZ 08EB) <- the buggy instruction (DOS 3.3) values of AL other than described here put PC-DOS 4.00 into the same loop (the buggy instructions are the same) Notes: supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh if DOS 4.01 SHARE was automatically loaded, file sharing is in an inactive state (due to the undocumented /NC flag used by the autoload code) until this call is made DOS 5+ chains to the previous handler if AL <> 00h on entry Windows Enhanced mode hooks this call and reports that SHARE is installed even when it is not SeeAlso: AX=1080h,INT 21/AH=52h --------d-2F1001----------------------------- INT 2F U - DR DOS 6.0 SHARE internal - SET ??? AX = 1001h DX:BX -> ???function Notes: this function is also supported by SuperStor, a disk-compression program by Addstor which is bundled with DR DOS 6.0, and the Novell DOS 7 DELWATCH.EXE the default handler for the pointer set by this call under DELWATCH simply returns with CF set SeeAlso: AX=1000h,AX=F800h --------f-2F1040----------------------------- INT 2F U - DOS 4 only SHARE internal - ??? AX = 1040h ??? Return: AL = FFh??? SeeAlso: AX=1000h --------f-2F1080----------------------------- INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS AX = 1080h Return: AL = status F0h successful FFh checking was already on Note: DOS 4.x SHARE has dual functions: FCB support for large (>32M) media and file sharing checks. The undocumented commandline flag /NC can be used to disable the sharing code. SeeAlso: AX=1000h,AX=1081h --------f-2F1081----------------------------- INT 2F U - DOS 4 only SHARE internal - TURN OFF FILE SHARING CHECKS AX = 1081h Return: AL = status F0h successful FFh checking was already off Note: (see AX=1080h) SeeAlso: AX=1000h,AX=1080h --------O-2F10FE----------------------------- INT 2F U - Novell DOS 7 DELWATCH.EXE - INSTALLATION CHECK AX = 10FEh Return: AX = 20FFh if installed and active DX:BX -> private entry point (see #1939) (Table 1939) Call DELWATCH private entry point with: AH = function 00h NOP??? Return: AX = 0000h CX = 0004h (unsupported function) 01h disable DELWATCH on drive AL = drive number (00h = A:) Return: AX = status (0000h if failed, FFFFh if successful) 02h ??? AL = drive number (00h = A:) ??? Return: ??? 03h ??? AL = drive number (00h = A:) CX = ??? (0000h/0001h) ??? Return: ??? 04h ??? AL = drive number (00h = A:) ??? Return: ??? 05h ??? AL = drive number (00h = A:) ??? Return: ??? 06h enable DELWATCH on drive AL = drive number with bit 7 set (80h = A:, etc.) BX = maximum files of same name in one directory to save CX = maximum files to save on this disk ??? Return: AX = status 0000h failed FFFFh successful CX = error code on failure (0004h if AL < 80h on entry) 07h ??? 08h set file extensions list AL = sense (00h exclude named extensions, 01h only named ext.) DS:BX -> 31-byte ASCIZ extension list (three blank-padded bytes per extension) Return: AX = FFFFh (successful) 09h ??? AL = drive number (00h = A:) ??? Return: ??? 0Ah ??? AL = drive number (00h = A:) ??? Return: ??? 0Bh reset ??? Return: AX = FFFFh (successful) see also function 0Dh 0Ch check if drive enabled AL = drive number with bit 7 set (80h = A:, etc.) Return: AX = state 0000h disabled or error (check CX) 0001h drive enabled CX = error code (0004h invalid drive number) 0Dh set ??? BX = ??? Return: AX = FFFFh (successful) see also function 0Bh 0Eh ??? AL = drive number (00h = A:) ??? Return: ??? Return: AX = 0000h, CX = 0001h if DELWATCH busy registers unchanged if AH >= 0Fh on entry --------O-2F10FF----------------------------- INT 2F U - Multiplex - DR DOS 5.0 - ??? AX = 10FFh ES:BX -> ??? Note: sets pointer in kernel --------N-2F1100----------------------------- INT 2F C - NETWORK REDIRECTOR - INSTALLATION CHECK AX = 1100h Return: AL = status 00h not installed, OK to install 01h not installed, not OK to install FFh installed AH = product identifier (ad hoc by various manufacturers) 00h if PC Tools v8 DRIVEMAP 42h ('B') for Beame&Whiteside BWNFS v3.0a 6Eh ('n') for NetWare Lite v1.1 CLIENT Notes: this function is called by the DOS 3.1+ kernel in DOS 4.x only, the 11xx calls are all in IFSFUNC.EXE, not in the PC LAN Program redirector; DOS 5+ moves the calls back into the redirector the PC Network 1.00 redirector (renamed to PC LAN Program in 1.1-1.3) only supports AL=00h-27h --------d-2F1100SFDADA----------------------- INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK AX = 1100h subfn DADAh STACK: WORD DADAh Return: AL = status 00h not installed, OK to install STACK unchanged 01h not installed, not OK to install STACK unchanged FFh installed STACK: WORD ADADh if MSCDEX installed DADBh if Lotus CD/Networker installed Note: although MSCDEX sets the stack word to ADADh on return, any value other than DADAh is considered to mean that MSCDEX is already installed; Lotus CD/Networker v4+ uses this feature to fool MSCDEX into thinking it is already installed when it is in fact CD/Networker that is installed Index: installation check;Lotus CD/Networker Index: Lotus CD/Networker;installation check --------N-2F1101----------------------------- INT 2F CU - NETWORK REDIRECTOR - REMOVE REMOTE DIRECTORY AX = 1101h SS = DOS DS SDA first filename pointer -> fully-qualified directory name SDA CDS pointer -> current directory structure for drive with dir Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1103h,AX=1105h,INT 21/AH=3Ah,INT 21/AH=60h --------N-2F1102----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - REMOVE REMOTE DIRECTORY AX = 1102h SS = DOS DS SDA first filename pointer -> fully-qualified directory name SDA CDS pointer -> current directory structure for drive with dir Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: appears to be identical to AX=1101h; MS internal documentation calls this function "SEQ_RMDIR" SeeAlso: AX=1101h --------N-2F1103----------------------------- INT 2F CU - NETWORK REDIRECTOR - MAKE REMOTE DIRECTORY AX = 1103h SS = DOS DS SDA first filename pointer -> fully-qualified directory name SDA CDS pointer -> current directory structure for drive with dir Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1101h,AX=1105h,INT 21/AH=39h,INT 21/AH=60h --------N-2F1104----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - MAKE REMOTE DIRECTORY AX = 1104h SS = DOS DS SDA first filename pointer -> fully-qualified directory name SDA CDS pointer -> current directory structure for drive with dir Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: appears to be identical to AX=1103h SeeAlso: AX=1103h --------N-2F1105----------------------------- INT 2F CU - NETWORK REDIRECTOR - CHDIR AX = 1105h SS = DOS DS SDA first filename pointer -> fully-qualified directory name SDA CDS pointer -> current directory structure for drive with dir Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful CDS updated with new path Notes: this function is called by the DOS 3.1+ kernel directory string in CDS should not have a terminating backslash unless the current directory is the root SeeAlso: AX=1101h,AX=1103h,INT 21/AH=3Bh,INT 21/AH=60h --------N-2F1106----------------------------- INT 2F CU - NETWORK REDIRECTOR - CLOSE REMOTE FILE AX = 1106h BX = device info word from SFT ES:DI -> SFT SFT DPB field -> DPB of drive containing file Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful SFT updated (redirector must decrement open count, which may be done with INT 2F/AX=1208h) Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1116h,AX=1201h,AX=1208h,AX=1227h,INT 21/AH=3Eh --------N-2F1107----------------------------- INT 2F CU - NETWORK REDIRECTOR - COMMIT REMOTE FILE AX = 1107h ES:DI -> SFT SFT DPB field -> DPB of drive containing file Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful all buffers for file flushed directory entry updated Note: this function is called by the DOS 3.1+ kernel SeeAlso: INT 21/AH=68h,INT 21/AX=5D01h --------N-2F1108----------------------------- INT 2F CU - NETWORK REDIRECTOR - READ FROM REMOTE FILE AX = 1108h ES:DI -> SFT SFT DPB field -> DPB of drive containing file CX = number of bytes SS = DOS DS SDA DTA field -> user buffer Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful CX = number of bytes read (0000h = end of file) SFT updated Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1109h,AX=1229h,INT 21/AH=3Fh"DOS",INT 21/AX=5D06h --------N-2F1109----------------------------- INT 2F CU - NETWORK REDIRECTOR - WRITE TO REMOTE FILE AX = 1109h ES:DI -> SFT SFT DPB field -> DPB of drive containing file CX = number of bytes SS = DOS DS SDA DTA field -> user buffer Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful CX = number of bytes written SFT updated Notes: this function is called by the DOS 3.1+ kernel PrintCache v3.1 PCACHE.EXE intercepts this function for SFTs where the Device Driver Header field points at PCACHE, but does not intercept any other network redirector functions SeeAlso: AX=1107h,AX=1108h,INT 21/AH=40h,INT 21/AX=5D06h --------N-2F110A----------------------------- INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE AX = 110Ah BX = file handle CX:DX = starting offset SI = high word of size STACK: WORD low word of size ES:DI -> SFT SFT DPB field -> DPB of drive containing file SS = DOS DS Return: CF set on error AL = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) STACK unchanged Notes: this function is called by the DOS 3.10-3.31 kernel the redirector is expected to resolve lock conflicts SeeAlso: AX=110Bh,INT 21/AH=5Ch --------N-2F110A----------------------------- INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - LOCK/UNLOCK REGION OF FILE AX = 110Ah BL = function 00h lock 01h unlock CX = number of lock/unlock parameters (0001h for DOS 4.0-6.1) DS:DX -> parameter block (see #1940) ES:DI -> SFT SFT DPB field -> DPB of drive containing file SS = DOS DS Return: CF set on error AL = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) Notes: this function is called by the DOS 4.0+ kernel the redirector is expected to resolve lock conflicts SeeAlso: AX=110Bh,INT 21/AH=5Ch Format of parameter block entry [array, but currently limited to single entry]: Offset Size Description (Table 1940) 00h DWORD start offset 04h DWORD size of region --------N-2F110B----------------------------- INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - UNLOCK REGION OF FILE AX = 110Bh BX = file handle CX:DX = starting offset SI = high word of size STACK: WORD low word of size ES:DI -> SFT for file SFT DPB field -> DPB of drive containing file Return: CF set on error AL = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) STACK unchanged Note: this function is called by the DOS 3.1-3.31 kernel; DOS 4.0+ calls AX=110Ah instead SeeAlso: AX=110Ah,INT 21/AH=5Ch --------N-2F110C----------------------------- INT 2F CU - NETWORK REDIRECTOR - GET DISK INFORMATION AX = 110Ch ES:DI -> current directory structure for desired drive Return: CF clear if data valid AL = sectors per cluster AH = media ID byte BX = total clusters CX = bytes per sector DX = number of available clusters CF set if data invalid Note: this function is called by the DOS 3.1+ kernel SeeAlso: INT 21/AH=36h --------N-2F110D----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - SET REMOTE FILE'S ATTRIBUTES AX = 110Dh SDA first filename pointer -> name of file ??? Return: ??? Note: similar to AX=110Eh SeeAlso: AX=110Eh --------N-2F110E----------------------------- INT 2F CU - NETWORK REDIRECTOR - SET REMOTE FILE'S ATTRIBUTES AX = 110Eh SS = DOS DS SDA first filename pointer -> fully-qualified name of file SDA CDS pointer -> current directory structure for drive with file STACK: WORD new file attributes Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful STACK unchanged Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=110Dh,AX=110Fh,INT 21/AX=4301h,INT 21/AH=60h --------N-2F110F----------------------------- INT 2F CU - NETWORK REDIRECTOR - GET REMOTE FILE'S ATTRIBUTES AND SIZE AX = 110Fh SS = DOS DS SDA first filename pointer -> fully-qualified name of file SDA CDS pointer -> current directory structure for drive with file Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful AX = file attributes BX:DI = file size Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=110Eh,INT 21/AX=4300h,INT 21/AH=60h --------N-2F1110----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET REMOTE FILE'S ATTRIBUTES AND SIZE AX = 1110h SDA first filename pointer -> name of file ??? Return: ??? Note: appears to be similar to AX=110Fh SeeAlso: AX=110Eh --------N-2F1111----------------------------- INT 2F CU - NETWORK REDIRECTOR - RENAME REMOTE FILE AX = 1111h SS = DS = DOS DS SDA first filename pointer = offset of fully-qualified old name SDA second filename pointer = offset of fully-qualified new name SDA CDS pointer -> current directory structure for drive with file Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1112h,INT 21/AH=56h,INT 21/AH=60h --------N-2F1112----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - RENAME REMOTE FILE AX = 1112h SS = DS = DOS DS SDA first filename pointer -> name of file ??? Return: ??? Note: similar to AX=1111h SeeAlso: AX=1111h --------N-2F1113----------------------------- INT 2F CU - NETWORK REDIRECTOR - DELETE REMOTE FILE AX = 1113h SS = DS = DOS DS SDA first filename pointer -> fully-qualified filename in DOS DS SDA CDS pointer -> current directory structure for drive with file Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Notes: this function is called by the DOS 3.1+ kernel the filespec may contain wildcards SeeAlso: AX=1114h,INT 21/AH=41h,INT 21/AH=60h --------N-2F1114----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - DELETE REMOTE FILE AX = 1114h SDA first filename pointer -> name of file ??? Return: ??? Note: similar to AX=1113h SeeAlso: AX=1113h --------N-2F1115----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - OPEN REMOTE FILE AX = 1115h SS = DOS DS ES:DI -> SFT ??? ??? Return: ??? Note: similar to AX=1116h SeeAlso: AX=1116h,AX=112Eh --------N-2F1116----------------------------- INT 2F CU - NETWORK REDIRECTOR - OPEN EXISTING REMOTE FILE AX = 1116h ES:DI -> uninitialized SFT SS = DOS DS SDA first filename pointer -> fully-qualified name of file to open STACK: WORD file access and sharing modes (see #0749 at INT 21/AH=3Dh) Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful SFT filled (except handle count, which DOS manages itself) STACK unchanged Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1106h,AX=1115h,AX=1117h,AX=1118h,AX=112Eh,INT 21/AH=3Dh SeeAlso: INT 21/AH=60h --------N-2F1117----------------------------- INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE REMOTE FILE AX = 1117h ES:DI -> uninitialized SFT SS = DOS DS SDA first filename pointer -> fully-qualified name of file to open SDA CDS pointer -> current directory structure for drive with file STACK: WORD file creation mode low byte = file attributes (see #0748 at INT 21/AH=3Ch) high byte = 00h normal create, 01h create new file Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful SFT filled (except handle count, which DOS manages itself) STACK unchanged Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1106h,AX=1116h,AX=1118h,AX=112Eh,INT 21/AH=3Ch,INT 21/AH=60h --------N-2F1118----------------------------- INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE FILE WITHOUT CDS AX = 1118h ES:DI -> uninitialized SFT SS = DOS DS SDA first filename pointer -> fully-qualified name of file STACK: WORD file creation mode low byte = file attributes high byte = 00h normal create, 01h create new file Return: ??? STACK unchanged Note: this function is called by the DOS 3.1+ kernel when creating a file on a drive for which the SDA CDS pointer has offset FFFFh SeeAlso: AX=1106h,AX=1116h,AX=1117h,AX=112Eh,INT 21/AH=60h --------N-2F1119----------------------------- INT 2F CU - NETWORK REDIRECTOR - FIND FIRST FILE WITHOUT CDS AX = 1119h SS = DS = DOS DS [DTA] = uninitialized 21-byte findfirst search data (see #0967 at INT 21/AH=4Eh) SDA first filename pointer -> fully-qualified search template SDA search attribute = attribute mask for search Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful [DTA] = updated findfirst search data (bit 7 of first byte must be set) [DTA+15h] = standard directory entry for file (see #0700) Notes: this function is called by the DOS 3.1+ kernel DOS 4.x IFSFUNC returns CF set, AX=0003h SeeAlso: AX=111Ah,AX=111Bh,INT 21/AH=1Ah --------N-2F111A----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - FIND NEXT FILE WITHOUT CDS AX = 111Ah ??? Return: CF set AX = error code (03h for DOS 4.01 IFSFUNC) Note: use AX=111Ch for DOS 5+ SeeAlso: AX=1119h,AX=111Ch --------N-2F111B----------------------------- INT 2F CU - NETWORK REDIRECTOR - FINDFIRST AX = 111Bh SS = DS = DOS DS [DTA] = uninitialized 21-byte findfirst search data (see #0967 at INT 21/AH=4Eh) SDA first filename pointer -> fully-qualified search template SDA CDS pointer -> current directory structure for drive with file SDA search attribute = attribute mask for search Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful [DTA] = updated findfirst search data (bit 7 of first byte must be set) [DTA+15h] = standard directory entry for file (see #0700) Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1119h,AX=111Ch,INT 21/AH=1Ah,INT 21/AH=4Eh,INT 21/AH=60h --------N-2F111C----------------------------- INT 2F CU - NETWORK REDIRECTOR - FINDNEXT AX = 111Ch SS = DS = DOS DS ES:DI -> CDS ES:DI -> DTA (MSDOS v5.0) [DTA] = 21-byte findfirst search data (see #0967 at INT 21/AH=4Eh) Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful [DTA] = updated findfirst search data (bit 7 of first byte must be set) [DTA+15h] = standard directory entry for file (see #0700) Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1119h,AX=111Bh,INT 21/AH=1Ah,INT 21/AH=4Fh --------N-2F111D----------------------------- INT 2F CU - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS (ABORT) AX = 111Dh SS = DOS DS SDA PSP segment field = PSP of terminating process Return: nothing Notes: used when a process is aborted; the process being terminated is indicated by the "sharing PSP" field in the SDA (offset 1Ah/1Ch) this function is called by the DOS 3.1+ kernel closes all FCBs opened by process SeeAlso: INT 21/AX=5D04h --------N-2F111E----------------------------- INT 2F CU - NETWORK REDIRECTOR - DO REDIRECTION AX = 111Eh SS = DOS DS STACK: WORD function to execute 5F00h get redirection mode BL = type (03h printer, 04h disk) Return: BH = state (00h off, 01h on) 5F01h set redirection mode BL = type (03h printer, 04h disk) BH = state (00h off, 01h on) 5F02h get redirection list entry BX = redirection list index DS:SI -> 16-byte local device name buffer ES:DI -> 128-byte network name buffer Return: must set user's BX to device type and CX to stored parameter value, using AX=1218h to get stack frame address 5F03h redirect device BL = device type (see INT 21/AX=5F03h) CX = stored parameter value DS:SI -> ASCIZ source device name ES:DI -> destination ASCIZ network path + ASCIZ passwd 5F04h cancel redirection DS:SI -> ASCIZ device name or network path 5F05h get redirection list extended entry BX = redirection list index DS:SI -> buffer for ASCIZ source device name ES:DI -> buffer for destination ASCIZ network path Return: BH = status flag BL = type (03h printer, 04h disk) CX = stored parameter value BP = NETBIOS local session number 5F06h similar to 5F05h??? Return: CF set on error AX = error code (see #1020 at INT 21/AH=59h/BX=0000h) STACK unchanged Notes: this function is called by the DOS 3.1+ kernel on INT 21/AH=5Fh (including LAN Manager calls) the PC Network 1.00 redirector does not support function 5F06h SeeAlso: INT 21/AX=5F00h,INT 21/AX=5F01h,INT 21/AX=5F02h,INT 21/AX=5F03h SeeAlso: INT 21/AX=5F04h,INT 21/AX=5F05h,INT 21/AX=5F06h --------N-2F111F----------------------------- INT 2F CU - NETWORK REDIRECTOR - PRINTER SETUP AX = 111Fh STACK: WORD function 5E02h set printer setup 5E03h get printer setup 5E04h set printer mode 5E05h get printer mode Return: CF set on error AX = error code (see #1020 at INT 21/AH=59h/BX=0000h) STACK unchanged Note: this function is called by the DOS 3.1+ kernel SeeAlso: INT 21/AX=5E02h,INT 21/AX=5E03h,INT 21/AX=5E04h,INT 21/AX=5E05h --------N-2F1120----------------------------- INT 2F CU - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS AX = 1120h DS = DOS DS ??? Return: CF clear (successful) Notes: this function is called by the DOS 3.1+ kernel uses CDS array pointer and LASTDRIVE= entries in DOS list of lists SeeAlso: INT 21/AH=0Dh,INT 21/AX=5D01h --------N-2F1121----------------------------- INT 2F CU - NETWORK REDIRECTOR - SEEK FROM END OF REMOTE FILE AX = 1121h CX:DX = offset (in bytes) from end ES:DI -> SFT SFT DPB field -> DPB of drive with file SS = DOS DS Return: CF set on error AL = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful DX:AX = new file position Note: this function is called by the DOS 3.1+ kernel, but only when seeking from the end of a file opened with sharing modes set in such a manner that another process is able to change the size of the file while it is already open SeeAlso: AX=1228h,INT 21/AH=42h --------N-2F1122----------------------------- INT 2F CU - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK AX = 1122h SS = DOS DS DS = PSP of process about to terminate Return: ??? Notes: this function is called by the DOS 3.1+ kernel after calling this function, the kernel calls INT 2F/AX=111Dh SeeAlso: AX=111Dh,INT 21/AH=4Ch,INT 60/DI=0601h --------N-2F1123----------------------------- INT 2F CU - NETWORK REDIRECTOR - QUALIFY REMOTE FILENAME AX = 1123h DS:SI -> ASCIZ filename to canonicalize ES:DI -> 128-byte buffer for qualified name Return: CF set if not resolved Notes: called by MS-DOS 3.1+ kernel, but not called by DR DOS 5.0 unless the filename matches the name of a character device called first when DOS attempts to resolve a filename (unless inside an AX=5D00h server call); if this fails, DOS resolves the name locally SeeAlso: AX=1221h,INT 21/AH=60h --------N-2F1124----------------------------- INT 2F CU - NETWORK REDIRECTOR - TURN OFF REMOTE PRINTER AX = 1124h ES:DI -> SFT SS = DOS DS ??? Return: CX = ??? Note: this function is called by the DOS 3.1+ kernel if AX=1126h returns CF set SeeAlso: AX=1126h --------N-2F1125----------------------------- INT 2F CU - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE AX = 1125h STACK: WORD subfunction 5D07h get print stream state Return: DL = current state 5D08h set print stream state DL = new state 5D09h finish print job Return: CF set on error AX = error code (see #1020 at INT 21/AH=59h/BX=0000h) STACK unchanged Note: this function is called by the DOS 3.1+ kernel SeeAlso: INT 21/AX=5D07h,INT 21/AX=5D08h,INT 21/AX=5D09h --------N-2F1126----------------------------- INT 2F CU - NETWORK REDIRECTOR - REMOTE PRINTER ECHO ON/OFF AX = 1126h ES:DI -> SFT for file handle 4??? SS = DOS DS??? ??? Return: CF set on error Notes: this function is called by the DOS 3.1+ kernel called when print echoing (^P, ^PrtSc) changes state and STDPRN has bit 11 of the device information word in the SFT set SeeAlso: AX=1124h --------N-2F1127----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED AX = 1127h Return: CF set AX = 0001h (invalid function) (see #1020 at INT 21/AH=59h/BX=0000h) --------N-2F1127BX4E57----------------------- INT 2F - NetWare 4.0 - REMOTE FILE COPY AX = 1127h BX = 4E57h ('NW') (signature identifying this as a NetWare call) SI = source file handle DI = destination file handle DX:CX = number of bytes to copy, starting at current file position Return: CF clear if successful CF set on error AX = error code (05h,06h,0Bh,11h,3Bh) (see #1020) DX:CX = number of bytes successfully copied (file position updated) Notes: this is the only call which may be made directly to the NetWare redirector from an application COMMAND.COM's COPY and DOS's XCOPY reportedly call INT 21/AX=1127h in order to speed up copies between files on the same network server; if error code 11h (not same device) is returned, the copy is performed in the usual manner. However, no such calls appear to be present in MS-DOS 6.22. --------N-2F1128----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED AX = 1128h Return: CF set AX = 0001h (invalid function) (see #1020 at INT 21/AH=59h/BX=0000h) --------N-2F1129----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED AX = 1129h Return: CF set AX = 0001h (invalid function) (see #1020 at INT 21/AH=59h/BX=0000h) --------N-2F112A----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - CLOSE ALL FILES FOR PROCESS AX = 112Ah DS = DOS DS ??? Return: ??? Note: does something to each IFS driver --------N-2F112B----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL AX = 112Bh SS = DOS DS CX = function/category DS:DX -> parameter block STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh) ??? Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: this function is called by the DOS 4.0 kernel --------N-2F112C----------------------------- INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - "UPDATE_CB" - ??? AX = 112Ch SS = DOS DS SDA current SFT pointer -> SFT for file ??? Return: CF set on error Note: called by SHARE in DOS 5.0-6.0 --------N-2F112D----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - EXTENDED ATTRIBUTES AX = 112Dh BL = subfunction (value of AL on INT 21) 02h get extended attributes 03h get extended attribute properties 04h set extended attributes Return: CF clear else ??? Return: CX = ??? (00h or 02h for DOS 4.01) ES:DI -> SFT for file SS = DOS DS Return: DS = DOS DS Note: this function is called by the DOS 4.0 kernel on INT 21/AX=5702h, INT 21/AX=5703h, and INT 21/AX=5704h SeeAlso: INT 21/AX=5702h,INT 21/AX=5703h,INT 21/AX=5704h,INT 21/AH=6Eh --------N-2F112E----------------------------- INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - EXTENDED OPEN/CREATE FILE AX = 112Eh SS = DS = DOS DS ES:DI -> uninitialized SFT for file STACK: WORD file attribute for created/truncated file low byte = file attributes high byte = 00h normal create/open, 01h create new file SDA first filename pointer -> fully-qualified filename SDA extended file open action = action code (see #1112 at INT 21/AX=6C00h) SDA extended file open mode = open mode for file (see INT 21/AX=6C00h) Return: CF set on error AX = error code CF clear if successful CX = result code 01h file opened 02h file created 03h file replaced (truncated) SFT initialized (except handle count, which DOS manages itself) Note: this function is called by the DOS 4.0+ kernel BUG: this function is not called correctly under some DOS versions (at least 5.0 and 6.2): the file attribute on the stack is not correct if the action code is 11h, the result code in CX is not passed back to the application. SeeAlso: AX=1115h,AX=1116h,AX=1117h,INT 21/AX=6C00h --------N-2F112F----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - IFS IOCTL AX = 112Fh SS = DOS DS STACK: WORD function in low byte 00h ??? DS:SI -> Current Directory Structure??? CL = drive (1=A:) 01h ??? DS:SI -> ??? CL = file handle??? 02h ??? DS:SI -> Current Directory Structure??? DI = ??? CX = drive (1=A:) ??? Return: CF set on error AX = DOS error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful Note: this function is called by the DOS 4.0 kernel SeeAlso: INT 21/AH=6Bh --------N-2F1130----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET IFSFUNC SEGMENT AX = 1130h Return: ES = CS of resident IFSFUNC --------N-2F1180----------------------------- INT 2F - LAN Manager Enhanced DOS Services - ??? AX = 1180h ??? Return: ??? --------N-2F1182----------------------------- INT 2F - LAN Manager Enhanced DOS Services - INSTALL SERVICE AX = 1182h ??? Return: ??? --------N-2F1184----------------------------- INT 2F - LAN Manager Enhanced DOS - ??? AX = 1184h ??? Return: ??? --------N-2F1186----------------------------- INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe AX = 1186h DS:SI -> stack frame (see #1941) Return: CF clear if successful CF set if error AX = error code Note: LAN Manager enhance mode adds features beyond the standard redirector file/printer services SeeAlso: AX=118Fh,AX=1190h,AX=1191h,INT 21/AX=5F39h Format of LAN Manager DosReadAsynchNmPipe stack frame: Offset Size Description (Table 1941) 00h DWORD -> number of bytes read 04h WORD size of buffer 06h DWORD -> buffer 0Ah DWORD -> return code 0Eh DWORD function to call on completion as function( char far *buffer ) 12h WORD handle --------N-2F118A----------------------------- INT 2F - LAN Manager 2.0+ DOS Enhanced ENCRYPT.EXE - STREAM ENCRYPTION SERVICE AX = 118Ah BX = function (0000h or 0001h) Return: CF clear if successful AX = 1100h success CF set if error AX = 0001h, etc. SeeAlso: AX=1186h,AH=41h,AH=42h,AH=4Bh --------N-2F118B----------------------------- INT 2F - LAN Manager Enhanced DOS - ??? AX = 118Bh ??? Return: ??? --------N-2F118C----------------------------- INT 2F - LAN Manager Enhanced DOS - ??? AX = 118Ch ??? Return: ??? --------N-2F118E----------------------------- INT 2F - LAN Manager Enhanced DOS - ??? AX = 118Eh ??? Return: ??? --------N-2F118F----------------------------- INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe AX = 118Fh DS:SI -> stack frame (see #1942) Return: CF clear if successful CF set if error AX = error code SeeAlso: AX=1186h,AX=1191h,INT 21/AX=5F3Ah Format of LAN Manager DosReadAsynchNmPipe stack frame: Offset Size Description (Table 1942) 00h DWORD -> number of bytes read 04h WORD Size of buffer 06h DWORD -> buffer 0Ah DWORD -> return code 0Eh DWORD function to call on completion as function( char far *buffer ) 12h WORD handle --------N-2F1190----------------------------- INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe2 AX = 1190h DS:SI -> stack frame (see #1943) Return: CF clear if successful CF set if error AX = error code SeeAlso: AX=1186h,AX=1191h Format of LAN Manager DosReadAsynchNmPipe2 stack frame: Offset Size Description (Table 1943) 00h DWORD -> number of bytes read 04h WORD size of buffer 06h DWORD -> buffer 0Ah DWORD -> return code 0Eh DWORD function to call on completion as function( char far *buffer ) 12h WORD handle 14h DWORD ??? --------N-2F1191----------------------------- INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe2 AX = 1191h DS:SI -> stack frame (see #1944) Return: CF clear if successful CF set if error AX = error code SeeAlso: AX=118Fh,AX=1190h,INT 21/AX=5F3Ah Format of LAN Manager DosReadAsynchNmPipe2 stack frame: Offset Size Description (Table 1944) 00h DWORD -> number of bytes read 04h WORD size of buffer 06h DWORD -> buffer 0Ah DWORD -> return code 0Eh DWORD function to call on completion as function( char far *buffer ) 12h WORD handle 14h DWORD ??? --------D-2F1200----------------------------- INT 2F U - DOS 3.0+ internal - INSTALLATION CHECK AX = 1200h Return: AL = FFh (for compatibility with other INT 2F functions) --------D-2F1201----------------------------- INT 2F U - DOS 3.0+ internal - CLOSE CURRENT FILE AX = 1201h SS = DOS DS (must be using a DOS internal stack) SDA current SFT pointer -> SFT of file to close Return: CF set on error BX??? CX new reference count of SFT ES:DI -> SFT for file SeeAlso: AX=1106h,AX=1227h,INT 21/AH=3Eh --------D-2F1202----------------------------- INT 2F U - DOS 3.0+ internal - GET INTERRUPT ADDRESS AX = 1202h STACK: WORD vector number Return: ES:BX -> interrupt vector (DWORD containing handler's address) STACK unchanged --------D-2F1203----------------------------- INT 2F U - DOS 3.0+ internal - GET DOS DATA SEGMENT AX = 1203h Return: DS = data segment of IBMDOS.COM/MSDOS.SYS Note: for DOS prior to version 5.0, the data segment is the same as the code segment --------D-2F1204----------------------------- INT 2F U - DOS 3.0+ internal - NORMALIZE PATH SEPARATOR AX = 1204h STACK: WORD character to normalize Return: AL = normalized character (forward slash turned to backslash, all others unchanged) ZF set if path separator STACK unchanged --------D-2F1205----------------------------- INT 2F U - DOS 3.0+ internal - OUTPUT CHARACTER TO STANDARD OUTPUT AX = 1205h STACK: WORD character to output Return: STACK unchanged Note: can be called only from within DOS --------D-2F1206----------------------------- INT 2F U - DOS 3.0+ internal - INVOKE CRITICAL ERROR AX = 1206h DI = error code BP:SI -> device driver header (see #0987) SS = DOS DS (must be using a DOS internal stack) STACK: WORD value to be passed to INT 24 in AX Return: AL = 0-3 for Abort, Retry, Ignore, Fail STACK unchanged SeeAlso: INT 24 --------D-2F1207----------------------------- INT 2F U - DOS 3.0+ internal - MAKE DISK BUFFER MOST-RECENTLY USED AX = 1207h DS:DI -> disk buffer Return: nothing Desc: move the indicated buffer to the end of the disk buffer chain (least- recently used is first); under DOS 3.3, the buffer is then moved to the start of the disk buffer chain if it was marked unused Notes: can be called only from within DOS this function is nearly the same as AX=120Fh SeeAlso: AX=120Fh --------D-2F1208----------------------------- INT 2F U - DOS 3.0+ internal - DECREMENT SFT REFERENCE COUNT AX = 1208h ES:DI -> SFT Return: AX = original value of reference count Notes: if the reference count was 1, it is set to FFFFh (since 0 indicates that the SFT is not in use). It is the caller's responsibility to set the reference count to zero after cleaning up. used by network redirectors such as MSCDEX SeeAlso: AX=1106h --------D-2F1209----------------------------- INT 2F U - DOS 3.0+ internal - FLUSH AND FREE DISK BUFFER AX = 1209h DS:DI -> disk buffer Return: disk buffer marked unused, contents written to disk if buffer dirty Note: can be called only from within DOS SeeAlso: AX=120Eh,AX=1215h --------D-2F120A----------------------------- INT 2F U - DOS 3.0+ internal - PERFORM CRITICAL ERROR INTERRUPT AX = 120Ah DS = SS = DOS DS (must be using a DOS internal stack) STACK: WORD extended error code Return: AL = user response (0=ignore, 1=retry, 2=abort, 3=fail) CF clear if retry, set otherwise STACK unchanged Notes: can only be called during a DOS function call, as it uses various fields in the SDA to set up the registers for the INT 24 reportedly sets current DPB's first root directory sector to 1 SeeAlso: INT 24 --------D-2F120B----------------------------- INT 2F U - DOS 3.0+ internal - SIGNAL SHARING VIOLATION TO USER AX = 120Bh ES:DI -> system file table entry for previous open of file STACK: WORD extended error code (should be 20h--sharing violation) Return: CF clear if operation should be retried CF set if operation should not be retried AX = error code (20h) (see #1020 at INT 21/AH=59h/BX=0000h) STACK unchanged Notes: can only be called during a DOS function call should only be called if an attempt was made to open an already-open file contrary to the sharing rules invokes INT 24 if SFT file opened via FCB or in compatibility mode with inheritance allowed --------D-2F120C----------------------------- INT 2F U - DOS 3.0+ internal - OPEN DEVICE AND SET SFT OWNER/MODE AX = 120Ch SDA current SFT pointer -> SFT for file DS = DOS DS SS = DOS DS (must be using a DOS internal stack) Return: ES, DI, AX destroyed Notes: invokes "device open" call on device driver for SFT changes owner of last-accessed SFT to calling process if it was opened via FCB called by network redirectors such as MSCDEX --------D-2F120D----------------------------- INT 2F U - DOS 3.0+ internal - GET DATE AND TIME AX = 120Dh SS = DOS DS (must be using a DOS internal stack) Return: AX = current date in packed format (see #1006 at INT 21/AX=5700h) DX = current time in packed format (see #1005 at INT 21/AX=5700h) SeeAlso: INT 21/AH=2Ah,INT 21/AH=2Ch --------D-2F120E----------------------------- INT 2F U - DOS 3.0+ internal - MARK ALL DISK BUFFERS UNREFERENCED AX = 120Eh SS = DOS DS (must be using a DOS internal stack) Return: DS:DI -> first disk buffer Notes: clears "referenced" flag on all disk buffers in DOS 5+, this has become essentially a NOP, invoking the same code used by AX=1224h (SHARING DELAY) SeeAlso: AX=1209h,AX=1210h,INT 21/AH=0Dh --------D-2F120F----------------------------- INT 2F U - DOS 3.0+ internal - MAKE BUFFER MOST RECENTLY USED AX = 120Fh DS:DI -> disk buffer SS = DOS DS (must be using a DOS internal stack) Return: DS:DI -> next buffer in buffer list Desc: move the indicated buffer to the end of the disk buffer chain (least- recently used is first); under DOS 3.3, the buffer is then moved to the start of the disk buffer chain if it was marked unused Note: this function is the same as AX=1207h except that it returns a pointer to the buffer following the specified buffer in the buffer chain SeeAlso: AX=1207h --------D-2F1210----------------------------- INT 2F U - DOS 3.0+ internal - FIND UNREFERENCED DISK BUFFER AX = 1210h DS:DI -> first disk buffer to check Return: ZF clear if found DS:DI -> first unreferenced disk buffer ZF set if not found Note: in DOS 5+, this has become essentially a NOP, invoking the same code used by AX=1224h (SHARING DELAY) SeeAlso: AX=120Eh --------D-2F1211----------------------------- INT 2F U - DOS 3.0+ internal - NORMALIZE ASCIZ FILENAME AX = 1211h DS:SI -> ASCIZ filename to normalize ES:DI -> buffer for normalized filename Return: destination buffer filled with uppercase filename, with slashes turned to backslashes SeeAlso: AX=121Eh,AX=1221h --------D-2F1212----------------------------- INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING AX = 1212h ES:DI -> ASCIZ string Return: CX = length of string SeeAlso: AX=1225h --------D-2F1213----------------------------- INT 2F U - DOS 3.0+ internal - UPPERCASE CHARACTER AX = 1213h STACK: WORD character to convert to uppercase Return: AL = uppercase character STACK unchanged --------D-2F1214----------------------------- INT 2F U - DOS 3.0+ internal - COMPARE FAR POINTERS AX = 1214h DS:SI = first pointer ES:DI = second pointer Return: ZF set if pointers are equal, ZF clear if not equal CF clear if pointers equal, CF set if not --------D-2F1215----------------------------- INT 2F U - DOS 3.0+ internal - FLUSH BUFFER AX = 1215h DS:DI -> disk buffer SS = DOS DS (must be using a DOS internal stack) STACK: WORD drives for which to skip buffer ignore buffer if drive same as high byte, or bytes differ and the buffer is for a drive OTHER than that given in low byte Return: STACK unchanged Note: can be called only from within DOS SeeAlso: AX=1209h --------D-2F1216----------------------------- INT 2F U - DOS 3.0+ internal - GET ADDRESS OF SYSTEM FILE TABLE ENTRY AX = 1216h BX = system file table entry number Return: CF clear if successful ES:DI -> system file table entry BX = relative entry number in system file table containing entry AX destroyed CF set if BX greater than FILES= Note: supported by DR DOS 5+ SeeAlso: AX=1220h --------D-2F1217----------------------------- INT 2F U - DOS 3.0+ internal - GET CURRENT DIRECTORY STRUCTURE FOR DRIVE AX = 1217h SS = DOS DS (must be using a DOS internal stack) STACK: WORD drive (0 = A:, 1 = B:, etc) Return: CF set on error (drive > LASTDRIVE) CF clear if successful DS:SI -> current directory structure for specified drive STACK unchanged SeeAlso: AX=1219h --------D-2F1218----------------------------- INT 2F U - DOS 3.0+ internal - GET CALLER'S REGISTERS AX = 1218h Return: DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack) Note: only valid while within DOS --------D-2F1219----------------------------- INT 2F U - DOS 3.0+ internal - SET DRIVE??? AX = 1219h SS = DOS DS (must be using a DOS internal stack) STACK: WORD drive (0 = default, 1 = A:, etc) Return: ??? STACK unchanged Notes: calls AX=1217h builds a current directory structure if inside server call (INT 21/AX=5D00h) SeeAlso: AX=1217h,AX=121Fh --------D-2F121A----------------------------- INT 2F U - DOS 3.0+ internal - GET FILE'S DRIVE AX = 121Ah DS:SI -> filename Return: AL = drive (0 = default, 1 = A:, etc, FFh = invalid) DS:SI -> filename without leading X: (if present) SeeAlso: INT 21/AH=19h,INT 21/AH=60h --------D-2F121B----------------------------- INT 2F U - DOS 3.0+ internal - SET YEAR/LENGTH OF FEBRUARY AX = 121Bh CL = year - 1980 Return: AL = number of days in February Note: requires DS to be set to the DOS data segment SeeAlso: INT 21/AH=2Bh"DATE" --------D-2F121C----------------------------- INT 2F U - DOS 3.0+ internal - CHECKSUM MEMORY AX = 121Ch DS:SI -> start of memory to checksum CX = number of bytes DX = initial checksum SS = DOS DS (must be using a DOS internal stack) Return: AX, CX destroyed DX = checksum DS:SI -> first byte after checksummed range Notes: used by DOS to determine day count since 1/1/80 given a date supported by DR DOS 5.0+ SeeAlso: AX=121Dh --------D-2F121D----------------------------- INT 2F U - DOS 3.0+ internal - SUM MEMORY AX = 121Dh DS:SI -> memory to add up CX = 0000h DX = limit Return: AL = byte which exceeded limit CX = number of bytes before limit exceeded DX = remainder after adding first CX bytes DS:SI -> byte beyond the one which exceeded the limit Notes: used by DOS to determine year or month given day count since 1/1/80 supported by DR DOS 5.0+ SeeAlso: AX=121Ch --------D-2F121E----------------------------- INT 2F U - DOS 3.0+ internal - COMPARE FILENAMES AX = 121Eh DS:SI -> first ASCIZ filename ES:DI -> second ASCIZ filename Return: ZF set if filenames equivalent, ZF clear if not Note: supported by DR DOS 5.0+ SeeAlso: AX=1211h,AX=1221h --------D-2F121F----------------------------- INT 2F U - DOS 3.0+ internal - BUILD CURRENT DIRECTORY STRUCTURE AX = 121Fh SS = DOS DS (must be using a DOS internal stack) STACK: WORD drive letter Return: ES:DI -> current directory structure (will be overwritten by next call) STACK unchanged --------D-2F1220----------------------------- INT 2F U - DOS 3.0+ internal - GET JOB FILE TABLE ENTRY AX = 1220h BX = file handle Return: CF set on error AL = 6 (invalid file handle) CF clear if successful ES:DI -> JFT entry for file handle in current process Notes: the byte pointed at by ES:DI contains the number of the SFT for the file handle, or FFh if the handle is not open supported by DR DOS 5.0+ SeeAlso: AX=1216h,AX=1229h --------D-2F1221----------------------------- INT 2F U - DOS 3.0+ internal - CANONICALIZE FILE NAME AX = 1221h DS:SI -> file name to be fully qualified ES:DI -> 128-byte buffer for resulting canonical file name SS = DOS DS (must be using a DOS internal stack) Return: (see INT 21/AH=60h) Note: identical to INT 21/AH=60h SeeAlso: AX=1123h,INT 21/AH=60h --------D-2F1222----------------------------- INT 2F U - DOS 3.0+ internal - SET EXTENDED ERROR INFO AX = 1222h SS = DOS data segment SS:SI -> 4-byte records BYTE error code, FFh = last record BYTE error class, FFh = don't change BYTE suggested action, FFh = don't change BYTE error locus, FFh = don't change SDA error code set Return: SI destroyed SDA error class, error locus, and suggested action fields set Note: can be called only from within DOS SeeAlso: AX=122Dh,INT 21/AH=59h/BX=0000h,INT 21/AX=5D0Ah --------D-2F1223----------------------------- INT 2F U - DOS 3.0+ internal - CHECK IF CHARACTER DEVICE AX = 1223h DS = DOS DS SS = DOS DS (must be using a DOS internal stack) SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name SDA+22Bh (DOS 4.0-6.0) = eight-character blank-padded name Return: CF set if no character device by that name found CF clear if found BH = low byte of device attribute word Note: can only be called from within DOS SeeAlso: INT 21/AX=5D06h,INT 21/AX=5D0Bh --------D-2F1224----------------------------- INT 2F U - DOS 3.0+ internal - SHARING RETRY DELAY AX = 1224h SS = DOS DS (must be using a DOS internal stack) Return: after delay set by INT 21/AX=440Bh, unless in server call (INT 21/AX=5D00h) Note: delay is dependent on the processor speed, and is skipped entirely if inside a server call SeeAlso: INT 21/AX=440Bh,INT 21/AH=52h,INT 62/AX=0097h --------D-2F1225----------------------------- INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING AX = 1225h DS:SI -> ASCIZ string Return: CX = length of string Note: supported by DR DOS 5.0+ SeeAlso: AX=1212h --------D-2F1226----------------------------- INT 2F U - DOS 3.3+ internal - OPEN FILE AX = 1226h CL = access mode DS:DX -> ASCIZ filename SS = DOS DS (must be using a DOS internal stack) Return: CF set on error AL = error code (see #1020 at INT 21/AH=59h/BX=0000h) CF clear if successful AX = file handle Notes: can only be called from within DOS equivalent to INT 21/AH=3Dh used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel SeeAlso: AX=1227h,INT 21/AH=3Dh --------D-2F1227----------------------------- INT 2F U - DOS 3.3+ internal - CLOSE FILE AX = 1227h BX = file handle SS = DOS DS (must be using a DOS internal stack) Return: CF set on error AL = 06h invalid file handle CF clear if successful Notes: can only be called from within DOS equivalent to INT 21/AH=3Eh used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel SeeAlso: AX=1106h,AX=1201h,AX=1226h,INT 21/AH=3Eh --------D-2F1228BP4200----------------------- INT 2F U - DOS 3.3+ internal - MOVE FILE POINTER AX = 1228h BP = 4200h, 4201h, 4202h (see INT 21/AH=42h) BX = file handle CX:DX = offset in bytes SS = DOS DS (must be using a DOS internal stack) Return: as for INT 21/AH=42h Notes: equivalent to INT 21/AH=42h, but may only be called from inside a DOS function call sets user stack frame pointer to dummy buffer, moves BP to AX, performs LSEEK, and restores frame pointer used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel SeeAlso: INT 21/AH=42h --------D-2F1229----------------------------- INT 2F U - DOS 3.3+ internal - READ FROM FILE AX = 1229h BX = file handle CX = number of bytes to read DS:DX -> buffer SS = DOS DS (must be using a DOS internal stack) Return: as for INT 21/AH=3Fh"DOS" Notes: equivalent to INT 21/AH=3Fh, but may only be called when already inside a DOS function call used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel SeeAlso: AX=1226h,INT 21/AH=3Fh"DOS" --------D-2F122A----------------------------- INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT AX = 122Ah BX = entry point to set (0001h or 0002h) DS:SI -> FASTOPEN entry point (see #1945,#1946) (entry point not set if SI = FFFFh for DOS 4.0+) Return: CF set if specified entry point already set Notes: entry point in BX is ignored under DOS 3.30 both entry points set to same handler by DOS 4.01 DOS 5.0 and 6.0 only set entry point 1 (Table 1945) Values DOS 3.30+ FASTOPEN entry point is called with: AL = 01h Lookup CX = ??? seems to be offset DI = ??? seems to be offset SI = offset in DOS DS of filename AL = 02h insert file into FASTOPEN cache AL = 03h delete file from FASTOPEN cache SI = offset in DOS DS of filename AL = 04h purge FASTOPEN cache AH = subfunction (00h,01h,02h) ES:DI -> ??? CX = ??? (subfunctions 01h and 02h only) Returns: CF set on error or not installed Note: function 03h calls function 01h first SeeAlso: #1946,#1947 (Table 1946) Values PC-DOS 4.01 FASTOPEN is additionally called with: AL = 04h ??? AH = 03h ??? AL = 05h ??? AL = 0Bh ??? AL = 0Ch ??? AL = 0Dh ??? AL = 0Eh ??? AL = 0Fh ??? AL = 10h ??? SeeAlso: #1945,#1947 (Table 1947) Values MS-DOS 5.0-6.0 FASTOPEN is additionally called with: AL = 04h purge FASTOPEN cache AH = 03h ??? AL = 05h ??? DL = drive (00h = A:) ??? AL = 06h ??? ??? SeeAlso: #1945,#1946 --------D-2F122B----------------------------- INT 2F U - DOS 3.3+ internal - IOCTL AX = 122Bh BP = 44xxh SS = DOS DS (must be using a DOS internal stack) additional registers as appropriate for INT 21/AX=44xxh Return: as for INT 21/AH=44h Notes: equivalent to INT 21/AH=44h, but may only be called when already inside a DOS function call sets user stack frame pointer to dummy buffer, moves BP to AX, performs IOCTL, and restores frame pointer used by NLSFUNC in accessing COUNTRY.SYS when invoked by the DOS kernel SeeAlso: INT 21/AH=44h --------D-2F122C----------------------------- INT 2F U - DOS 3.3+ internal - GET DEVICE CHAIN AX = 122Ch Return: BX:AX -> header of second device driver (NUL is first) in driver chain Note: although this function exists in DR DOS 5.0 and Novell DOS 7, it always returns 0000h:0000h prior to Novell DOS 7 Update 15 SeeAlso: INT 21/AH=52h --------D-2F122D----------------------------- INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE AX = 122Dh SS = DOS DS Return: AX = current extended error code SeeAlso: AX=1222h,INT 21/AH=59h/BX=0000h --------D-2F122E----------------------------- INT 2F U - DOS 4.0+ internal - GET OR SET ERROR TABLE ADDRESSES AX = 122Eh DL = subfunction 00h get standard DOS error table (see #1948) Return: ES:DI -> error table (DOS 4: errors 00h-12h,50h-5Bh) (DOS 5: errors 00h-26h,4Fh,51h-59h) 01h set standard DOS error table ES:DI -> error table 02h get parameter error table (errors 00h-0Ah) Return: ES:DI -> error table 03h set parameter error table ES:DI -> error table 04h get critical/SHARE error table (errors 13h-2Bh) Return: ES:DI -> error table 05h set critical/SHARE error table ES:DI -> error table 06h get ??? error table Return: ES:DI -> error table or 0000h:0000h 07h set ??? error table ES:DI -> error table 08h get error message retriever (see #1949) Return: ES:DI -> FAR procedure to fetch error message 09h set ??? error table ES:DI -> error table Notes: if the returned segment on a "get" is 0001h, then the offset specifies the offset of the error message table within COMMAND.COM, and the procedure returned by DL=08h should be called DOS 5+ COMMAND.COM does not allow setting any of the addresses (calls with DL odd are ignored); they are always returned with segment 0001h for DOS 5.0, the standard and critical/SHARE error tables are combined into a single error table SeeAlso: AX=0500h,INT 21/AH=59h/BX=0000h Format of DOS 4.x error table: Offset Size Description (Table 1948) 00h BYTE FFh 01h 2 BYTEs 04h,00h (DOS version???) 03h BYTE number of error headers following 04h 2N WORDs table of all error headers for table Offset Size Description 00h WORD error message number 02h WORD offset of error message from start of header error messages are count byte followed by msg Note: DOS 5 error tables consist of one word per error number; each word contains either the offset of a counted string or 0000h (Table 1949) Call error retrieval function with: AX = error number (see #1950) DI = offset of error table Return: ES:DI -> error message (counted string) Notes: this function needs to access COMMAND.COM if the messages were not loaded into memory permanently with /MSG; the caller should assume that the returned message will be overwritten by the next call of the function supported by DR DOS 5.0 (Table 1950) Values for parameter errors: 01h Too many parameters 02h Required Parameter missing 03h Invalid switch 04h Invalid keyword 06h Parameter value not in allowed range 07h Parameter value not allowed 08h Parameter value not allowed 09h Parameter format not correct 0Ah Invalid parameter 0Bh Invalid parameter combination --------D-2F122F----------------------------- INT 2F U - DOS 4.x internal - SET DOS VERSION NUMBER TO RETURN AX = 122Fh DX = DOS version number (0000h = return true DOS version) Note: not available under DR DOS 5.0 or 6.0 SeeAlso: INT 21/AH=30h,INT 21/AX=3306h --------O-2F12FFBL00------------------------- INT 2F - FreeDOS - FDAK-DDT - INSTALLATION CHECK / STATUS CHECK AX = 12FFh BL = 00h Return: AL = DDh if installed BH = state (00h disabled, nonzero enabled) BL = readonly flag (00h writable, nonzero read-only) Program: FDAK-DDT is the FreeDOS Alternative Kernel Device Drivers Testing release by Yury A. Semenov SeeAlso: AX=12FFh/BL=07h --------O-2F12FFBL01------------------------- INT 2F - FreeDOS - FDAK-DDT - ENABLE FDAK DRIVERS AX = 12FFh BL = 01h SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=02h --------O-2F12FFBL02------------------------- INT 2F - FreeDOS - FDAK-DDT - DISABLE FDAK DRIVERS AX = 12FFh BL = 02h SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=01h --------O-2F12FFBL03------------------------- INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-ONLY AX = 12FFh BL = 03h ??? SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=04h --------O-2F12FFBL04------------------------- INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-WRITE AX = 12FFh BL = 04h ??? SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=03h --------O-2F12FFBL05------------------------- INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR ON AX = 12FFh BL = 05h Note: not yet implemented as of January 1996 SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=06h --------O-2F12FFBL06------------------------- INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR OFF AX = 12FFh BL = 06h Note: not yet implemented as of January 1996 SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=05h --------O-2F12FFBL07------------------------- INT 2F - FreeDOS - FDAK-DDT - UNINSTALL AX = 12FFh BL = 07h Return: ES = segment of FDAK memory block Note: the caller must free the memory block returned in ES (via INT 21/AH=49h) SeeAlso: AX=12FFh/BL=00h --------m-2F12FFBX0006----------------------- INT 2F U - DR DOS 6, Novell DOS 7 - EMM386.EXE - VIDEO MEMORY SPACE CONTROL AX = 12FFh BX = 0006h DX = 0000h CX = function 0000h get status of video memory space (MEMMAX /V) 0001h map memory into video memory space (MEMMAX +V) 0002h unmap memory from video memory space (MEMMAX -V) Return: CF clear if successful AX = 0000h (successful) BX = segment of reserved video RAM CX = segment of used video RAM DX = segment of first upper MCB Notes: this functionality is provided by EMM386, and partially supported by HIDOS.SYS BL specifies which program handles the call, BH is the function number SeeAlso: AX=D201h/BX=4849h --------O-2F12FFBX0000----------------------- INT 2F U - Novell DOS 7 - GET ??? AX = 12FFh BX = 0000h Return: AX = 0000h if supported DX = ??? (internal data) SeeAlso: AX=12FFh/BX=0001h --------O-2F12FFBX0001----------------------- INT 2F U - Novell DOS 7 - SET ??? AX = 12FFh BX = 0001h DX = new value for ??? Return: AX = 0000h if supported SeeAlso: AX=12FFh/BX=0000h --------O-2F12FFBX0002----------------------- INT 2F U - Novell DOS 7 - GET ??? SIZE AX = 12FFh BX = 0002h Return: AX = 0000h if supported DX = size of/required-for ??? in paragraphs SeeAlso: AX=12FFh/BX=0003h --------O-2F12FFBX0003----------------------- INT 2F U - Novell DOS 7 - SET ??? AX = 12FFh BX = 0003h DX = new value for ??? Return: AX = 0000h if supported SeeAlso: AX=12FFh/BX=0002h --------O-2F12FFBX0007----------------------- INT 2F U - Novell DOS 7 - SCRIPT.EXE - GET ??? AX = 12FFh BX = 0007h CX = 0000h Return: CF clear if installed AX = 0000h BX = ??? (4426h) CX = ??? (0068h) DX = PSP segment of resident code??? SI = ??? (4AFAh) ES = resident code segment --------O-2F12FFBX0009----------------------- INT 2F U - Novell DOS 7 - SET ??? AX = 12FFh BX = 0009h DX = new value for ??? Return: ??? Note: the DX value is stored at offset 66h in SYSVARS and offset 18h in the Novell DOS 7 internal variable table --------m-2F12FFBX0106----------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - GET VERSION??? AX = 12FFh BX = 0106h Return: CF clear if successful AX = 0000h (successful) BX = EDC0h (signature) CL = memory manager variant (02h,03h) (02h when DPMI/VCPI disabled, 03h when DPMI/VCPI loaded) CH = ??? (00h) DX = version??? (0300h for v3.0) ES = segment of EMM386 low-memory stub Notes: BL specifies which program handles the call, BH is the function number if the word at ES:0012h is nonzero, if contains the offset within segment ES of the CEMM-compatible entry point (see #1951) if no other program has hooked INT 67, an alternate installation check is to test for the string "NOVELL EXPANDED MEMORY MANAGER 386" at offset 14h in the INT 67 handler's segment; the word immediately preceding this string contains the offset of the API entry point if it is nonzero Index: entry point;Novell EMM386 (Table 1951) Call Novell EMM386.EXE entry point with: AH = 00h get memory manager's status??? ??? AH = 01h set memory manager's status??? ??? AH = 02h Weitek coprocessor support??? AL = subfunction??? more functions??? SeeAlso: #0855 at INT 21/AX=4402h/SF=02h,#2915 at INT 67/AX=FFA5h --------m-2F12FFBL06------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - ??? AX = 12FFh BL = 06h BH = function (02h-09h) ??? Return: ??? --------O-2F12FFBX0EDC----------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - CHECK IF MULTITASKING SUPPORT LOADED??? AX = 12FFh BX = 0EDCh ('EDC' = Novell European Development Center) Return: AX = 0000h if ??? loaded CF clear BX = 0000h Notes: called by Novell DOS 7 TaskMgr if this function returns with AX=0000h, then the code necessary to support the API on INT 2F/AX=2780h is loaded and that API becomes available for use because the request is handled on the initial trap to the memory manager caused by INT instructions, this function must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h,AX=2780h/CL=04h --------D-2F13------------------------------- INT 2F U - DOS 3.2+ - SET DISK INTERRUPT HANDLER AH = 13h DS:DX -> interrupt handler disk driver calls on read/write ES:BX = address to restore INT 13 to on system halt (exit from root shell) or warm boot (INT 19) Return: DS:DX set by previous invocation of this function ES:BX set by previous invocation of this function Notes: IO.SYS hooks INT 13 and inserts one or more filters ahead of the original INT 13 handler. The first is for disk change detection on floppy drives, the second is for tracking formatting calls and correcting DMA boundary errors, the third is for working around problems in a particular version of IBM's ROM BIOS before the first call, ES:BX points at the original BIOS INT 13; DS:DX also points there unless IO.SYS has installed a special filter for hard disk reads (on systems with model byte FCh and BIOS date "01/10/84" only), in which case it points at the special filter most DOS 3.2+ disk access is via the vector in DS:DX, although a few functions are still invoked via an INT 13 instruction this is a dangerous security loophole for any virus-monitoring software which does not trap this call ("INT13", "Nomenklatura", and many Bulgarian viruses are known to use it to get the original ROM entry point) SeeAlso: INT 13/AH=01h,INT 19,INT 9D"VIRUS" --------N-2F13------------------------------- INT 2F U - MS-NET - ??? AH = 13h ??? Return: ??? Note: supposedly used to move (or control the movement of) NCBs --------U-2F1400----------------------------- INT 2F C - NLSFUNC.COM - INSTALLATION CHECK AX = 1400h Return: AL = 00h not installed, OK to install 01h not installed, not OK FFh installed Notes: this function is called by the DOS v3.3+ kernel supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh supported by DR DOS 5.0 documented for MS-DOS 5+, but undocumented in prior versions SeeAlso: AX=1401h"NLSFUNC",AX=1402h"NLSFUNC" --------D-2F1400----------------------------- INT 2F - European MS-DOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK AX = 1400h Return: AX = FFFFh if installed BX = maximum memory required to save screen and keyboard info CF clear if successful CF set on error AX = error code 0002h invalid function 0004h unknown error Note: the POPUP interface is used by background programs (see INT 21/AH=80h) to communicate with the user SeeAlso: AX=1401h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP" --------U-2F1401----------------------------- INT 2F CU - NLSFUNC.COM - CHANGE CODE PAGE AX = 1401h DS:SI -> internal code page structure (see #1952) BX = new code page (see #1099 at INT 21/AX=6602h) DX = country code??? Return: AL = status 00h successful else DOS error code Note: this function is called by the DOS v3.3+ kernel SeeAlso: AX=1400h"NLSFUNC",AX=1402h"NLSFUNC",INT 21/AH=66h Format of DOS 3.30 internal code page structure: Offset Size Description (Table 1952) 00h 8 BYTEs ??? 08h 64 BYTEs name of country information file 48h WORD system code page (see #1099 at INT 21/AX=6602h) 4Ah WORD number of supported subfunctions 4Ch 5 BYTEs data to return for INT 21/AX=6502h 51h 5 BYTEs data to return for INT 21/AX=6504h 56h 5 BYTEs data to return for INT 21/AX=6505h 5Bh 5 BYTEs data to return for INT 21/AX=6506h 60h 41 BYTEs data to return for INT 21/AX=6501h --------D-2F1401----------------------------- INT 2F - European MS-DOS 4.0 POPUP - "PostPu" - OPEN/CLOSE POPUP SCREEN AX = 1401h DL = function (00h open, 01h close) DH = wait flag 00h block until screen opens 01h return error if screen is not available 02h urgent--always open screen immediately Return: CF clear if successful BX = amount of memory needed to save screen and keyboard info, 0000h if default save location can be used (only if DH was 02h) CF set on error Note: the application using the screen is frozen until the popup screen is closed SeeAlso: AX=1400h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP" --------U-2F1402----------------------------- INT 2F CU - NLSFUNC.COM - GET EXTENDED COUNTRY INFO AX = 1402h BP = subfunction (same as AL for INT 21/AH=65h) BX = code page (see #1099 at INT 21/AX=6602h) DX = country code (see #0747 at INT 21/AH=38h) DS:SI -> internal code page structure (see #1952) ES:DI -> user buffer CX = size of user buffer Return: AL = status 00h successful else DOS error code Notes: this function is called by the DOS v3.3+ kernel on INT 21/AH=65h code page structure apparently only needed for COUNTRY.SYS pathname SeeAlso: AX=1401h"NLSFUNC",AX=1403h"NLSFUNC",AX=1404h,INT 21/AH=65h --------D-2F1402----------------------------- INT 2F - European MS-DOS 4.0 POPUP - "SavePu" - SAVE POPUP SCREEN AX = 1402h ES:DI -> save buffer (0000h:0000h for default buffer in POPUP) Return: CF clear if successful CF set on error AX = error code (see #1953) SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1403h"POPUP" (Table 1953) Values for POPUP error code: 0001h process does not own screen 0004h unknown error 0005h invalid pointer --------U-2F1403----------------------------- INT 2F CU - NLSFUNC.COM - SET CODE PAGE AX = 1403h DS:SI -> internal code page structure (see #1952) BX = code page (see #1099 at INT 21/AX=6602h) DX = country code (see #0747 at INT 21/AH=38h) Return: AL = status ??? Note: this function is called by the DOS v3.3+ kernel on INT 21/AH=38h SeeAlso: AX=1402h"NLSFUNC",AX=1404h,INT 21/AH=38h"SET" --------D-2F1403----------------------------- INT 2F - European MS-DOS 4.0 POPUP - "RestorePu" - RESTORE SCREEN AX = 1403h ES:DI -> buffer containing saved screen (0000h:0000h for default buffer in POPUP) Return: CF clear if successful CF set on error AX = error code (see #1953) SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1402h"POPUP" --------U-2F1404----------------------------- INT 2F CU - NLSFUNC.COM - GET COUNTRY INFO AX = 1404h BX = code page (see #1099 at INT 21/AX=6602h) DX = country code (see #0747 at INT 21/AH=38h) DS:SI -> internal code page structure (see #1952) ES:DI -> user buffer Return: AL = status ??? Notes: this function is called by the DOS v3.3+ kernel on INT 21/AH=38h code page structure apparently only needed for COUNTRY.SYS pathname SeeAlso: AX=1402h,AX=1403h,INT 21/AH=38h"GET" --------U-2F14FE----------------------------- INT 2F U - DR DOS 5.0 NLSFUNC - GET EXTENDED COUNTRY INFORMATION AX = 14FEh BX = code page (FFFFh=global code page) (see #1099 at INT 21/AX=6602h) DX = country ID (FFFFh=current country) (see #0747 at INT 21/AH=38h) ES:DI -> country information buffer CL = info ID 01h get general internationalization info 02h get pointer to uppercase table 04h get pointer to filename uppercase table 05h get pointer to filename terminator table 06h get pointer to collating sequence table 07h get pointer to Double-Byte Character Set table CF set (used to return error if not installed) Return: CF clear if successful DS:SI -> requested information CF set on error Notes: DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh, or FFh on entry. the DR DOS kernel calls this function on INT 21/AX=6501h the value in CL is not range-checked by the DR DOS 5.0 NLSFUNC SeeAlso: #1954,AX=14FFh,INT 21/AH=65h Format of DR DOS COUNTRY.SYS file: Offset Size Description (Table 1954) 00h 126 BYTEs copyright notice (terminated with Ctrl-Z, padded with NULs) 7Eh WORD signature EDC1h 80h var country pointer records Offset Size Description 00h WORD country code (0000h if end of array) 02h WORD code page (see #1099 at INT 21/AX=6602h) 04h WORD ??? (0000h) 06h 7 WORDs offsets in file for data tables for subfunctions 01h-07h var var country information --------U-2F14FF----------------------------- INT 2F U - DR DOS 5.0 NLSFUNC - PREPARE CODE PAGE AX = 14FFh BX = code page (see #1099 at INT 21/AX=6602h) Return: AX = ??? ZF set if AX=0000h Notes: DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh, or FFh on entry. passes codepage preparation request to each character device supporting the generic IOCTL call SeeAlso: AX=14FEh,INT 21/AX=440Ch,INT 21/AX=6602h --------U-2F1500----------------------------- INT 2F - DOS 4.00 GRAPHICS.COM - INSTALLATION CHECK AX = 1500h Return: AX = FFFFh ES:DI -> ??? (graphics data?) Note: this installation check conflicts with the CD-ROM Extensions installation check; moved to AX=AC00h in later versions SeeAlso: AX=AC00h --------d-2F1500BX0000----------------------- INT 2F - CD-ROM - INSTALLATION CHECK AX = 1500h BX = 0000h Return: BX = number of CD-ROM drive letters used CX = starting drive letter (0=A:) Notes: this installation check DOES NOT follow the format used by other software this installation check conflicts with the DOS 4.00 GRAPHICS.COM installation check BUG: this function may return an incorrect starting drive letter when INTERLNK is installed SeeAlso: AX=150Ch,AX=15FFh,INT 2F/AX=D000h"Lotus" --------c-2F1500CH90------------------------- INT 2F U - CDBLITZ v2.11 - INSTALLATION CHECK AX = 1500h CH = 90h (function number) BX = 1234h (magic value for CDBLITZ) Return: CX = 1234h if installed CF clear DX = BCD version number (DH = major, DL = minor) Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc. SeeAlso: AX=1500h/CH=99h --------c-2F1500CH91------------------------- INT 2F U - CDBLITZ v2.11 - GET STATISTICS AX = 1500h CH = 91h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear ES:BX -> statistics record (see #1955) SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=97h Format of CDBLITZ statistics record: Offset Size Description (Table 1955) 00h WORD cache mode (see also AX=1500h/CH=94h) 0001h 'min', 0002h 'max' 02h DWORD number of read calls??? 06h DWORD total number of sectors read 0Ah DWORD unused??? (zero) 0Eh DWORD number of cache hit sectors 12h WORD cache size in KB 14h WORD unused??? (zero) 16h WORD cache state (0000h disabled, 0001h enabled) --------c-2F1500CH92------------------------- INT 2F U - CDBLITZ v2.11 - ENABLE CACHE AX = 1500h CH = 92h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=93h,AX=1500h/CH=94h --------c-2F1500CH93------------------------- INT 2F U - CDBLITZ v2.11 - DISABLE CACHE AX = 1500h CH = 93h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h --------c-2F1500CH94------------------------- INT 2F U - CDBLITZ v2.11 - SET 'MAX' MODE (CACHE BOTH DIRECTORIES AND DATA) AX = 1500h CH = 94h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h --------c-2F1500CH95------------------------- INT 2F U - CDBLITZ v2.11 - SET 'MIN' MODE (CACHE ONLY DIRECTORY ENTRIES) AX = 1500h CH = 95h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=94h --------c-2F1500CH96------------------------- INT 2F U - CDBLITZ v2.11 - FLUSH CACHE AX = 1500h CH = 96h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear Note: this function resets the counts for number of sectors read and number of cache hits, but no other values in the statistics record (see #1955) SeeAlso: AX=1500h/CH=90h --------c-2F1500CH97------------------------- INT 2F U - CDBLITZ v2.11 - GET CACHE STATISTICS AX = 1500h CH = 97h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear AL = cache mode (01h 'min', 02h 'max') (see also AX=1500h/CH=94h) AH = cache state (00h disabled, 01h enabled) BX = cache size in KB DX:CX = total number of reads DI:SI = number of cache hits SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=91h --------c-2F1500CH99------------------------- INT 2F U - CDBLITZ v2.11 - UNINSTALL AX = 1500h CH = 99h (function number) BX = 1234h (magic value for CDBLITZ) Return: CF clear ??? Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc. SeeAlso: AX=1500h/CH=90h --------d-2F1501----------------------------- INT 2F - CD-ROM - GET DRIVE DEVICE LIST AX = 1501h ES:BX -> buffer to hold drive letter list (5 bytes per drive letter) Return: buffer filled, for each drive letter BYTE subunit number in driver DWORD address of device driver header (see #0987) Note: reportedly returns AX=0000h and an invalid address under Windows95 SeeAlso: AX=1510h --------d-2F1502----------------------------- INT 2F - CD-ROM - GET COPYRIGHT FILE NAME AX = 1502h ES:BX -> 38-byte buffer for name of copyright file CX = drive number (0=A:) Return: CF set if drive is not a CD-ROM drive AX = 000Fh (invalid drive) CF clear if successful SeeAlso: AX=1503h --------d-2F1503----------------------------- INT 2F - CD-ROM - GET ABSTRACT FILE NAME AX = 1503h ES:BX -> 38-byte buffer for name of abstract file CX = drive number (0=A:) Return: CF set if drive is not a CD-ROM drive AX = 000Fh (invalid drive) CF clear if successful SeeAlso: AX=1502h,AX=1504h --------d-2F1504----------------------------- INT 2F - CD-ROM - GET BIBLIOGRAPHIC DOC FILE NAME AX = 1504h ES:BX -> 38-byte buffer for name of bibliographic documentation file CX = drive number (0=A:) Return: CF set if drive is not a CD-ROM drive AX = 000Fh (invalid drive) CF clear if successful SeeAlso: AX=1502h,AX=1503h --------d-2F1505----------------------------- INT 2F - CD-ROM - READ VTOC AX = 1505h ES:BX -> 2048-byte buffer CX = drive number (0=A:) DX = sector index (0=first volume descriptor,1=second,...) Return: CF set on error AX = error code (15=invalid drive,21=not ready) CF clear if successful AX = volume descriptor type (1=standard,FFh=terminator,0=other) Note: This function was not supported by Novell DOS 7 NWCDEX prior to the 08/16/94 update --------d-2F1506----------------------------- INT 2F - CD-ROM - TURN DEBUGGING ON AX = 1506h BX = debugging function to enable Note: reserved for development SeeAlso: AX=1507h --------d-2F1507----------------------------- INT 2F - CD-ROM - TURN DEBUGGING OFF AX = 1507h BX = debugging function to disable Note: reserved for development SeeAlso: AX=1506h --------d-2F1508----------------------------- INT 2F - CD-ROM - ABSOLUTE DISK READ AX = 1508h ES:BX -> buffer CX = drive number (0=A:) SI:DI = starting sector number DX = number of sectors to read Return: CF set on error AL = error code (0Fh invalid drive,15h not ready) CF clear if successful Note: reportedly returns error 15h (not ready) under Windows95 SeeAlso: AX=1509h --------d-2F1509----------------------------- INT 2F - CD-ROM - ABSOLUTE DISK WRITE AX = 1509h ES:BX -> buffer CX = drive number (0=A:) SI:DI = starting sector number DX = number of sectors to write Note: corresponds to INT 26h and is currently reserved and nonfunctional SeeAlso: AX=1508h --------d-2F150A----------------------------- INT 2F - CD-ROM - RESERVED AX = 150Ah --------d-2F150B----------------------------- INT 2F - CD-ROM v2.00+ - DRIVE CHECK AX = 150Bh CX = drive number (0=A:) Return: BX = ADADh if MSCDEX.EXE installed AX = support status 0000h if drive not supported nonzero if supported SeeAlso: AX=150Dh --------d-2F150C----------------------------- INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION (GET VERSION) AX = 150Ch Return: BH = major version BL = minor version Notes: MSCDEX.EXE versions prior to 2.00 return BX=0000h Corel's CORELCDX.COM v1.01d returns 2.20, v1.12a returns 2.21 Meridian Data's CDNETEX.EXE returns its own version number, e.g. 4.70 Windows95 returns v2.95 SeeAlso: AX=1500h"CD-ROM" --------d-2F150D----------------------------- INT 2F - CD-ROM v2.00+ - GET CD-ROM DRIVE LETTERS AX = 150Dh ES:BX -> buffer for drive letter list (1 byte per drive) Return: buffer filled with drive numbers (0=A:). Each byte corresponds to the drive in the same position for function 1501h SeeAlso: AX=150Bh --------d-2F150E----------------------------- INT 2F - CD-ROM v2.00+ - GET/SET VOLUME DESCRIPTOR PREFERENCE AX = 150Eh BX = subfunction 00h get preference DX = 0000h Return: DX = preference settings 01h set preference DH = volume descriptor preference 01h = primary volume descriptor 02h = supplementary volume descriptor DL = supplementary volume descriptor preference 01h = shift-Kanji CX = drive number (0=A:) Return: CF set on error AX = error code (15=invalid drive,1=invalid function) CF clear if successful --------d-2F150F----------------------------- INT 2F - CD-ROM v2.00+ - GET DIRECTORY ENTRY AX = 150Fh CL = drive number (0=A:) CH bit 0 = copy flag clear if direct copy set if copy to structure which removes ISO/High Sierra diffs ES:BX -> ASCIZ path name SI:DI -> buffer for directory entry (see #1956,#1957) minimum 255 bytes for direct copy Return: CF set on error AX = error code CF clear if successful AX = disk format (0=High Sierra,1=ISO 9660) Note: this function was not supported by Novell DOS 7 NWCDEX prior to the 08/16/94 update Format of CD-ROM directory entry (direct copy): Offset Size Description (Table 1956) 00h BYTE length of directory entry 01h BYTE length of XAR in Logical Block Numbers 02h DWORD LBN of data, Intel (little-endian) format 06h DWORD LBN of data, Motorola (big-endian) format 0Ah DWORD length of file, Intel format 0Eh DWORD length of file, Motorola format ---High Sierra--- 12h 6 BYTEs date and time 18h BYTE bit flags 19h BYTE reserved ---ISO 9660--- 12h 7 BYTEs date and time (seventh byte is offset from GMT in 15-minute increments) 19h BYTE bit flags ---both formats--- 1Ah BYTE interleave size 1Bh BYTE interleave skip factor 1Ch WORD volume set sequence number, Intel format 1Eh WORD volume set sequence number, Motorola format 20h BYTE length of file name 21h N BYTEs file name BYTE (optional) padding if filename is odd length N BYTEs system data SeeAlso: #1957,#0700 Format of CD-ROM directory entry (canonicalized): Offset Size Description (Table 1957) 00h BYTE length of XAR in Logical Block Numbers 01h DWORD Logical Block Number of file start 05h WORD size of disk in logical blocks 07h DWORD file length in bytes 0Bh 7 BYTEs date and time 12h BYTE bit flags 13h BYTE interleave size 14h BYTE interleave skip factor 15h WORD volume set sequence number 17h BYTE length of file name 18h 38 BYTEs ASCIZ filename 3Eh WORD file version number 40h BYTE number of bytes of system use data 41h 220 BYTEs system use data SeeAlso: #1956 --------d-2F1510----------------------------- INT 2F - CD-ROM v2.10+ - SEND DEVICE DRIVER REQUEST AX = 1510h CX = CD-ROM drive letter (0 = A, 1 = B, etc) ES:BX -> CD-ROM device driver request header (see #1931 at AX=0802h) Note: MSCDEX initializes the device driver request header's subunit field based on the drive number specified in CX BUG: Novell DOS 7 NWCDEX prior to the 12/13/94 update did not initialize the subunit field SeeAlso: AX=0802h --------d-2F15FFBX0000----------------------- INT 2F - CD-ROM - CORELCDX - INSTALLATION CHECK AX = 15FFh BX = 0000h Return: BX = ABCDh if CORELCDX loaded Note: Corel's CORELCDX.COM is a replacement for MSCDEX.EXE; it also supports the standard MSCDEX installation check calls AX=1500h and AX=150Ch SeeAlso: AX=1500h"CD-ROM",AX=150Ch --------W-2F1600----------------------------- INT 2F - MS Windows - WINDOWS ENHANCED MODE INSTALLATION CHECK AX = 1600h Return: AL = status 00h neither Windows 3.x enhanced mode nor Windows/386 2.x running 01h Windows/386 2.x running 80h XMS version 1 driver installed (neither Windows 3.x enhanced mode nor Windows/386 2.x running) (obsolete--see note) FFh Windows/386 2.x running AL = anything else AL = Windows major version number >= 3 AH = Windows minor version number Notes: INT 2F/AH=16h comprises an API for non-Windows programs (DOS device drivers, TSRs, and applications) to cooperate with multitasking Windows/386 2.x and Windows 3.x and higher enhanced mode. certain calls are also supported in the Microsoft 80286 DOS extender in Windows standard mode this function served as the installation check and AX=1610h served to get the driver entry point for XMS version 1, which is now obsolete. Use AX=4300h and AX=4310h instead SeeAlso: AX=160Ah,AX=1610h,AX=4300h,AX=4680h Index: installation check;XMS version 1 --------W-2F1602----------------------------- INT 2F - MS Windows/386 2.x - GET API ENTRY POINT AX = 1602h Return: ES:DI -> Windows/386 2.x API procedure entry point Notes: this interface is supported in Windows 3.x only for 2.x compatibility to get the current virtual machine (VM) ID in Windows/386 2.x: AX = 0000h ES:DI -> return address JUMP to address returned from INT 2F/AX=1602h After JUMP, at return address: BX = current VM ID. SeeAlso: AX=C020h --------W-2F1603----------------------------- INT 2F - MS Windows/386 - GET INSTANCE DATA AX = 1603h Return: AX = 5248h ('RH') if supported DS:SI -> Windows/386 instance data (see #1958) Notes: reportedly supported by RM Nimbus MS-DOS 3.3 kernel this function is called by DOSMGR when AX=1607h/BX=0015h is not supported, as is the case in DOS versions prior to 5.0 see Geoff Chappell's book _DOS_Internals_ for additional discussions of this function, DOSMGR's behavior, and instancing in general SeeAlso: AX=1607h/BX=0015h Format of Windows/386 instance data: Offset Size Description (Table 1958) 00h WORD segment of IO.SYS (0000h = default 0070h) 02h WORD offset in IO.SYS of STACKS data structure (DOS 3.2x) 0000h if not applicable 04h WORD number of instance data entries (max 32) 06h Array of instance data entries Offset Size Description 00h WORD segment (0002h = DOS kernel) 02h WORD offset 04h WORD size --------W-2F1605----------------------------- INT 2F - MS Windows - WINDOWS ENHANCED MODE & 286 DOSX INIT BROADCAST AX = 1605h ES:BX = 0000h:0000h DS:SI = 0000h:0000h CX = 0000h DX = flags bit 0 = 0 if Windows enhanced-mode initialization bit 0 = 1 if Microsoft 286 DOS extender initialization bits 1-15 reserved (undefined) DI = version number (major in upper byte, minor in lower) Return: CX = 0000h if okay for Windows to load CX = FFFFh (other registers unchanged) if Windows 3.0 in standard mode CX <> 0 if Windows should not load ES:BX -> startup info structure (see #1959) DS:SI -> virtual86 mode enable/disable callback or 0000h:0000h (see #1962) Notes: the Windows enhanced mode loader and Microsoft 286 DOS extender will broadcast an INT 2F/AX=1605h call when initializing. Any DOS device driver or TSR can watch for this broadcast and return the appropriate values. If the driver or TSR returns CX <> 0, it is also its responsibility to display an error message. each handler must first chain to the prior INT 2F handler with registers unchanged before processing the call if the handler requires local data on a per-VM basis, it must store the returned ES:BX in the "next" field of a startup info structure and return a pointer to that structure in ES:BX a single TSR may set the V86 mode enable/disable callback; if DS:SI is already nonzero, the TSR must fail the initialization by setting CX nonzero MSD checks for Windows 3.0 running in standard mode by testing whether CX=FFFFh and other registers are unchanged on return Novell DOS v7.0 (Update 8 - Update 11) TASKMGR in multitasking mode uses this broadcast, even if TASKMGR.INI sets WinPresent= to OFF Microsoft's EMM386.EXE for DOS 5+ when installed with the NOEMS option changes its driver name from EMMQXXX0 to EMMXXXX0 while Windows is active SeeAlso: AX=1606h,AX=1608h,AX=4B05h Format of Windows Startup Information Structure: Offset Size Description (Table 1959) 00h 2 BYTEs major, minor version of info structure 02h DWORD pointer to next startup info structure or 0000h:0000h 06h DWORD pointer to ASCIZ name of virtual device file or 0000h:0000h 0Ah DWORD virtual device reference data (see #1961) (only used if above nonzero) 0Eh DWORD pointer to instance data records (see #1960) or 0000h:0000h Format of one Instance Item in array: Offset Size Description (Table 1960) 00h DWORD address of instance data (end of array if 0000h:0000h) 04h WORD size of instance data Format of Virtual Device Reference Data: Offset Size Description (Table 1961) 00h DWORD physical address of ??? or 00000000h 04h DWORD physical address of ??? table 08h DWORD "DEST_PAGE" address to which pages must be mapped 0Ch N DWORDs "SRC_PAGE" physical addresses of the pages 00000000h = end of table Note: EMM386.EXE sets the first pointer to the start of the device driver chain, the second pointer to a field of 40h bytes followed by a 16-bit offset to the end of the SRC_PAGE table, and DEST_PAGE to the start segment of the UMB area (Table 1962) Values Windows virtual mode enable/disable procedure is called with: AX = 0000h disable V86 mode AX = 0001h enable V86 mode interrupts disabled Return: CF set on error CF clear if successful interrupts disabled --------W-2F1606----------------------------- INT 2F - MS Windows - WINDOWS ENHANCED MODE & 286 DOSX EXIT BROADCAST AX = 1606h DX = flags bit 0 = 0 if Windows enhanced-mode exit bit 0 = 1 if Microsoft 286 DOS extender exit bits 1-15 reserved (undefined) Notes: if the init broadcast fails (AX=1605h returned CX <> 0), then this broadcast will be issued immediately. this call will be issued in real mode Novell DOS v7.0 (Update 8 - Update 15) TASKMGR in multitasking mode uses this broadcast, even if TASKMGR.INI sets WinPresent= to OFF SeeAlso: AX=1605h,AX=1609h --------W-2F1607----------------------------- INT 2F - MS Windows - VIRTUAL DEVICE CALL OUT API AX = 1607h BX = virtual device ID (see #1968) CX = (usually) callout subfunction Return: (usually) AX,BX,CX,DX,ES contain results Notes: more of a convention than an API, this call specifies a standard mechanism for Windows enhanced-mode virtual devices (VxD's) to talk to DOS device drivers and TSRs see below for details on several virtual devices SeeAlso: AX=1605h,AX=1607h/BX=000Ch,AX=1607h/BX=0014h,AX=1607h/BX=0015h SeeAlso: AX=1607h/BX=0018h,AX=1684h"DEVICE API",AX=C020h --------W-2F1607BX0006----------------------- INT 2F - MS Windows - "V86MMGR" VIRTUAL DEVICE API AX = 1607h BX = 0006h (VxD identifier of "V86MMGR") CX = 0000h Return: AX = status 0000h if local A20 state changed 1607h if A20 unchanged other if global A20 state changed --------W-2F1607BX000C----------------------- INT 2F - MS Windows - "VMD" VIRTUAL MOUSE DEVICE API AX = 1607h BX = 000Ch (VxD identifier of "VMD") Return: CX = nonzero if mouse driver already virtualized Note: VMD (Virtual Mouse Driver) calls this and then checks whether CX is nonzero; if yes, it will not automatically virtualize the mouse driver. This would be used if MOUSE.COM already virtualizes itself using the Windows API. SeeAlso: AX=1607h/BX=0014h,AX=1607h/BX=0015h --------W-2F1607BX0010----------------------- INT 2F C - MS Windows 3.1 - "BLOCKDEV" VIRTUAL HARD DISK DEVICE API AX = 1607h BX = 0010h (VxD identifier of "BLOCKDEV") CX = function 0001h starting FastDisk compatibility tests 0002h ending FastDisk compatibility tests 0003h check if FastDisk installation allowed Return: CX = 0000h if allowed Note: this interface is called by the Windows FastDisk driver (such as WDCTRL) when it thinks that the INT 13h handler immediately below IO.SYS's INT 13h code is not in ROM; it should be supported by any program which hooks itself underneath IO.SYS's INT 13h code with INT 2F/AH=13h SeeAlso: AX=1607h/BX=0014h,INT 2F/AH=13h --------W-2F1607BX0014----------------------- INT 2F - MS Windows - "VNETBIOS" VIRTUAL DEVICE API AX = 1607h BX = 0014h (VxD identifier of "VNETBIOS") Return: ES:DI -> 128-byte table specifying VNETBIOS actions for each NetBIOS command code (see #1963) Note: VNETBIOS (Virtual NetBIOS) calls this function to determine whether the NetBIOS has an extensions Windows should know about SeeAlso: AX=1607h/BX=000Ch,AX=1607h/BX=0010h,AX=1607h/BX=0015h (Table 1963) Values for VNETBIOS action code: 00h "VN_Unknown" unknown command 04h "VN_No_Map" no memory mapping necessary 08h "VN_Map_In" input buffer is quickly used, so no global mapping needed 0Ch "VN_Map_In" output buffer is quickly used, so no global mapping needed 10h "VN_Map_In_Out" buffer is quickly used, so no global mapping needed 14h "VN_Chain_Send" the chain-send command 18h "VN_Cancel" special case for cancel command 1Ch "VN_Buffer_In" buffer is incoming 20h "VN_Buffer_Out" buffer is outgoing 24h "VN_Buffer_In_Out" buffer used for both incoming and outgoing data --------D-2F1607BX0015----------------------- INT 2F C - MS Windows - "DOSMGR" VIRTUAL DEVICE API AX = 1607h BX = 0015h (VxD identifier of "DOSMGR") CX = function 0000h query instance processing DX = 0000h Return: CX = state 0000h not instanced other instanced (DOS 5+ kernel returns 0001h) DX = segment of DOS drivers or 0000h for default of 0070h ES:BX -> patch table (see #1965) 0001h set patches in DOS DX = bit mask of patch requests (see #1964) Return: AX = B97Ch BX = bit mask of patches applied (see #1964) DX = A2ABh 0002h remove patches in DOS (ignored by DOS 5.0 kernel) DX = bit mask of patch requests (see #1964) Return: CX = 0000h (DOS 5-6) Note: return values are ignored by DOSMGR in Windows 3.1 0003h get size of DOS data structures DX = bit mask of request (only one bit can be set) bit 0: Current Directory Structure size Return: if supported request: AX = B97Ch CX = size in bytes of requested structure DX = A2ABh else: CX = 0000h all other registers preserved 0004h determine instanced data structures Return: AX = B97Ch if supported DX = A2ABh if supported (DOS 5+ kernel returns 0000h) BX = bit mask of instanced items bit 0: CDS bit 1: SFT bit 2: device list bit 3: DOS swappable data area 0005h get device driver size ES = segment of device driver Return: DX:AX = 0000h:0000h on error (not dev. driver segment) DX:AX = A2ABh:B97Ch if successful BX:CX = size of device driver in bytes Notes: DOSMGR (DOS Manager) will check whether the OEM DOS/BIOS data has been instanced via this API and will not perform its own default instancing of the normal DOS/BIOS data if so; if this API is not supported, DOSMGR will also try to access instancing data through INT 2F/AX=1603h these functions are supported by the DOS 5+ kernel; DOSMGR contains tables of instancing information for earlier versions of DOS see Geoff Chappell's book _DOS_Internals_ for additional discussions of DOSMGR's behavior and instancing in general SeeAlso: AX=1603h,AX=1605h,AX=1607h/BX=000Ch,AX=1607h/BX=0014h SeeAlso: AX=1684h"DEVICE API" Bitfields for DOSMGR patch requests: Bit(s) Description (Table 1964) 0 enable critical sections 1 NOP setting/checking user ID 2 turn INT 21/AH=3Fh on STDIN into polling loop 3 trap stack fault in "SYSINIT" to WIN386 4 BIOS patch to trap "Insert disk X:" to WIN386 Format of DOSMGR patch table: Offset Size Description (Table 1965) 00h 2 BYTEs DOS version (major, minor) 02h WORD offset in DOS data segment of "SAVEDS" 04h WORD offset in DOS data segment of "SAVEBX" 06h WORD offset in DOS data segment of InDOS flag 08h WORD offset in DOS data segment of User ID word 0Ah WORD offset in DOS data segment of "CritPatch" table to enable critical section calls (see INT 2A/AH=80h) 0Ch WORD (DOS 5+ only) offset in DOS data segment of "UMB_HEAD", containing segment of last MCB in conventional memory --------W-2F1607BX0018----------------------- INT 2F C - MS Windows - "VMPoll" VIRTUAL DEVICE - IDLE CALLOUT AX = 1607h BX = 0018h (VMPoll VxD ID) CX = 0000h Return: AX = status 0000h if timeslice used nonzero if timeslice not needed Note: when VMPoll makes this callout, all virtual machines are idle SeeAlso: AX=1607h --------W-2F1607BX0021-------------------------------------- INT 2F C - MS Windows - "PageFile" VIRTUAL DEVICE - GET LOCK BYTE AX = 1607h BX = 0021h (PageFile VxD ID) CX = 0000h Return: AX = status 0000h success ES:DI -> cache lock byte in disk cacher other no disk cache or unsupported Notes: PageFile issues this call on real-mode initialization in order to allow disk caches to provide it with a byte which it can use to temporarily lock the disk cache; VMPOLL also issues this call, so it is made twice each time Windows starts up if this call fails, PageFile falls back to other techniques for locking the disk cache SeeAlso: AX=1607h --------E-2F1607BX22C0----------------------- INT 2F - Rational Systems DOS/4GW - ??? AX = 1607h BX = 22C0h ??? Return: ??? SeeAlso: INT 15/AX=BF02h,INT 15/AX=BF04h --------W-2F1608----------------------------- INT 2F C - MS Windows - WINDOWS ENHANCED MODE INIT COMPLETE BROADCAST AX = 1608h Notes: called after all installable devices have been initialized real-mode software may be called between the Windows enhanced-mode init call (AX=1605h) and this call; the software must detect this situation SeeAlso: AX=1605h,AX=1609h --------W-2F1609----------------------------- INT 2F C - MS Windows - WINDOWS ENHANCED MODE BEGIN EXIT BROADCAST AX = 1609h Note: called at the beginning of a normal exit sequence; not made in the event of a fatal system crash SeeAlso: AX=1606h,AX=1608h --------W-2F160A----------------------------- INT 2F - MS Windows 3.1 - IDENTIFY WINDOWS VERSION AND TYPE AX = 160Ah Return: AX = 0000h if call supported BX = version (BH=major, BL=minor) CX = mode (0002h = standard, 0003h = enhanced) SeeAlso: AX=1600h,AX=4680h --------W-2F160B----------------------------- INT 2F - MS Windows 3.1 - IDENTIFY TSRs AX = 160Bh ES:DI -> communication structure (see #1966) or 0000h:0000h Return: ES:DI -> communication structure Desc: this call allows Windows-aware TSRs to make themselves known to Windows. Note: the TSR should allocate a communication structure, place the given ES:DI pointer in the first field, and return a pointer to the new structure SeeAlso: AX=1605h,AX=160Ch,AX=4B01h,AX=4B05h Format of TSR-to-Windows communication structure: Offset Size Description (Table 1966) 00h DWORD pointer to next structure 04h WORD PSP segment 06h WORD API version ID (0100h) 08h WORD EXEC flags bit 0: "WINEXEC" bit 1: "LOADLIBRARY" bit 2: "OPENDRIVER" 0Ah WORD "exec_cmd_show" 0Ch DWORD "exec_cmd" 10h 4 BYTEs reserved (0) 14h DWORD pointer to TSR ID block (see #1967) 18h DWORD pointer to TSR data block or 0000h:0000h Format of Norton Utilities 6.0 TSR ID block: Offset Size Description (Table 1967) 00h WORD length of name string 02h N BYTEs name of TSR's executable --------W-2F160C----------------------------- INT 2F - MS Windows 3.1 - DETECT ROMs AX = 160Ch ??? Return: ??? Note: used by ROM Windows SeeAlso: AX=160Bh --------m-2F1610----------------------------- INT 2F - XMS v1.x only - GET DRIVER ADDRESS AX = 1610h details unavailable Note: this function and AX=1600h were only used in XMS version 1 and are now obsolete. Use AX=4300h and AX=4310h instead SeeAlso: AX=1600h,AX=4310h --------W-2F1680----------------------------- INT 2F - MS Windows, DPMI, various - RELEASE CURRENT VIRTUAL MACHINE TIME-SLICE AX = 1680h Return: AL = status 00h if the call is supported 80h (unchanged) if the call is not supported Notes: programs can use this function in idle loops to enhance performance under multitaskers; this call is supported by MS Windows 3.0, DOS 5+, DPMI 1.0+, and in OS/2 2.0+ for multitasking DOS applications does not block the program; it just gives up the remainder of the time slice should not be used by Windows-specific programs when called very often without intermediate screen output under WIN 3+, the VM will go into an idle-state and will not receive the next slice before 8 seconds. This time can be changed in SYSTEM.INI through "IdleVMWakeUpTime=<seconds>". Setting to zero results in a long wait. SeeAlso: INT 15/AX=1000h,INT 15/AX=5305h,INT 21/AH=89h,INT 7A/BX=000Ah --------W-2F1681----------------------------- INT 2F - MS Windows 3+ - BEGIN CRITICAL SECTION AX = 1681h Notes: used to prevent a task switch from occurring should be followed by an INT 2F/AX=1682h call as soon as possible nested calls are allowed, and must be followed by an appropriate number of "end critical section" calls not supported in Windows/386 2.x. Get INDOS flag with INT 21/AH=34h and increment by hand. SeeAlso: AX=1682h,INT 15/AX=101Bh,INT 21/AH=34h --------W-2F1682----------------------------- INT 2F - MS Windows 3+ - END CRITICAL SECTION AX = 1682h Notes: not supported in Windows/386 2.x. Get InDOS flag with INT 21/AH=34h and decrement by hand, taking care not to decrement InDOS flag through zero SeeAlso: AX=1681h,INT 15/AX=101Ch,INT 21/AH=34h --------W-2F1683----------------------------- INT 2F - MS Windows 3+ - GET CURRENT VIRTUAL MACHINE ID AX = 1683h Return: BX = current virtual machine (VM) ID Notes: Windows itself currently runs in VM 1, but this can't be relied upon VM IDs are reused when VMs are destroyed an ID of 0 will never be returned SeeAlso: AX=1684h"DEVICE API",AX=1685h,AX=168Bh --------W-2F1684----------------------------- INT 2F - MS Windows - GET DEVICE API ENTRY POINT AX = 1684h BX = virtual device (VxD) ID (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point, or 0:0 if the VxD does not support an API Note: some Windows enhanced-mode virtual devices provide services that applications can access. For example, the Virtual Display Device (VDD) provides an API used in turn by WINOLDAP. SeeAlso: AX=1683h,AX=4011h (Table 1968) Values for MS Windows VxD ID: Value Name CallOut V86 PM Description 0000h LPT N N N DOS386 LPT Device (Windows for Workgroups 3.11) 0000h MSODISUP N N N MS ODI Support (Windows for Workgroups 3.11) 0000h NWNBLINK N N N Netware NetBIOS (Windows for Workgroups 3.11) 0000h SERIAL N N N DOS386 Serial Device (Windows for Workgrp 3.11) 0001h VMM N N Virtual Machine Manager 0002h Debug 0003h VPICD Y Y Virtual Prog. Interrupt Controller (PIC) Device 0004h VDMAD N N Virtual Direct Memory Access (DMA) Device 0005h VTD Y Y Virtual Timer Device 0006h V86MMGR Y N N Virtual 8086 Mode Device 0007h PageSwap N N Paging Device 0008h Parity N N Parity-check trapper 0009h Reboot N Y Ctrl-Alt-Del handler 000Ah VDD N Y Virtual Display Device (GRABBER) 000Bh VSD N N Virtual Sound Device 000Ch VMD Y Y Y Virtual Mouse Device 000Dh VKD N Y Virtual Keyboard Device 000Eh VCD N Y Virtual COMM Device 000Fh VPD Virtual Printer Device 0010h VHD Virtual Hard Disk Device (Windows 3.0) 0010h BLOCKDEV N N Virtual Hard Disk Device (Windows 3.1) 0010h IOS N N N DOS386 IOS Device (Windows for Workgroups 3.11) 0010h IOS N Y (Chicago) 0011h VMCPD Y Y Virtual Math CoProcessor Device 0012h EBIOS N N Reserve EBIOS page (e.g., on PS/2) 0013h BIOSXLAT N N Map ROM BIOS API between prot & V86 mode 0014h VNETBIOS Y N N Virtual NetBIOS Device 0015h DOSMGR Y Y N DOS data instancing (see #1971) 0016h WINLOAD 0017h SHELL N Y 0018h VMPOLL N N 0019h VPROD 001Ah DOSNET N N assures network integrity across VMs 001Ah VNETWARE Y Y Novell NetWare DOSNET replacement 001Bh VFD N N Virtual Floppy Device 001Ch VDD2 Secondary display adapter 001Ch LoadHi N N Netroom LoadHi Device (RMLODHI.VXD) 001Ch LoadHi N N 386MAX LoadHi Device (386MAX.VXD) 001Ch LoadHi N N Win386 LoadHi Device (EMM386.EXE) 001Dh WINDEBUG N Y 001Dh TDDebug N Y 001Eh TSRLoad TSR instance utility 001Fh BiosHook BIOS interrupt hooker VxD 0020h Int13 N N N 0021h PageFile N Y Paging File device 0022h SCSI 0023h MCA_POS Microchannel Programmable Option Select 0024h SCSIFD SCSI FastDisk device 0025h VPEND Pen device 0026h APM Advanced Power Management 0027h VXDLDR N Y Y VXDLDR (Windows for Workgroups 3.11) 0028h NDIS N Y Y Network Driver Interface Specification (Windows for Workgroups 3.11) 002Ah VWIN32 N Y (Chicago) 002Bh VCOMM N Y Y DOS386 VCOMM Device (Windows for Workgrps 3.11) 002Dh W32S Y N Y WIN32s 32-bit extension to Windows API 0030h MACH32 N N Y ATI Mach32 video card 0031h NETBEUI N N N NETBEUI (Windows for Workgroups 3.11) 0032h SERVER N Y Y Int21 File Server (Windows for Workgroups 3.11) 0033h CONFIGMG Y Y (Chicago) 0033h EDOS N N Windows DOS Box Enhancer by Mom's Software 0034h DWCFGMG.SYS Plug-and-Play configuration manager 0036h VFBACKUP Y Y (Chicago) 0038h VCOND Y Y (Chicago) 003Ah VPMTD N N Y IFAX Scheduler Device (Windows for Workgr 3.11) 003Bh DSVXD Y N DoubleSpace VxD from MS-DOS v6.x 0051h ISAPNP N N 008Dh ESDI_506 N N (Chicago) 0090h voltrack N N 00FDh FAKEIDE N N (Chicago) 0102h CV1 N N Microsoft C/C++ 7.00+ CodeView for Windows 0200h VIPX Y Y NetWare Virtual IPX Driver 0200h VTEMPD dummy template driver by Ray Patch 0201h VNWLSERV N N NetWare Lite 1.1 Server (SERVER.EXE) 0202h WINICE Y Y SoftICE/W 0203h VCLIENT N Y NetWare Lite 1.1+ Client 0205h VCAFT N N Novell Virtual CAFT Driver (LANalyzer for Win) 0205h BCW Y Y Nu-Mega Bounds Checker for Windows 0206h VTXRX N N Novell Virtual TXRX Driver (LANalyzer for Win) 0207h DPMS N Y N Novell DOS Protected Mode Services 0234h VCOMMUTE Y Y PC Tools Commute 0442h VTDAPI N Y MMSys Win386 VTAPI Device 0444h VADMAD Autoinitialize DMA (Windows 3.0) 0445h VSBD Y Y WinResKit: Sound Blaster Device 0446h VADLIBD Y Y Y MMSys Win386 AdLib Device (v3.x) 045Dh VflatD N Y dva.386, part of WIN32s 0460h UNIMODEM N Y 0480h VNetSup N Y Y Virtual Net Support (Windows for Workgrps 3.11) 0481h VRedir N N N Redirector File System Driver (Windows for Workgroups 3.11) 0482h VBrowse Y Y Win386 Virtual Browser 0483h VSHARE N N Windows for Workgroups Virtual SHARE 0484h IFSMgr Y Y N Installable File System Manager (Windows for Workgroups 3.11) 0486h VFAT N Y Y Win386 HPFS Driver (Windows for Workgrps 3.11) 0487h NWLINK Y Y Win386 Virtual Packet Exchange Protocol 0487h NWSUP Y N N NetWare Vnetbios shim 0489h VIP Y 048Ah VTCP Y 048Bh VCache N Y Y Virtual File Cache (Windows for Workgrps 3.11) 048Bh VCACHE Y Y 048Dh RASMAC Y Y enhanced mode Win4Workgroups RASMAC device 1020h VCV Microsoft C/C++ 7.00 CodeView 1021h VMB Y Y Microsoft C/C++ 7.00 WXSRVR 1022h Vpfd Y Y Microsoft C/C++ 7.00 1025h MMD Y Y Microsoft C/C++ 8.00, Visual C/C++ 1.00 2020h PIPE Y Y by Thomas W. Olson, in Windows/DOS DevJrn 5/92 21EAh VADLIBWD N Y Adlib Waveform Driver by John Ridges 2200h VFINTD Y Y Norton VFINTD (Norton Desktop) 22C0h ??? Y Rational Systems DOS/4GW ??? 2402h ZMAX N N Qualitas 386MAX v7 DOSMAX handler 24A0h VNSS N Y Norton Screen Saver (Norton Desktop) 24A1h VNDWD Y Y Norton VNDWD Device (Norton Desktop) 24A2h SYMEvent Y Y Norton Utilities v8 2540h VILD Y N INTERLNK client from MS-DOS v6.x 2640h VASBID N Y WinResKit: Artisoft Sounding Board Device 2860h COMMTASK N N Y Windows 386-mode preemptive tasker by James A. Kenemuth of Interabang Computing 28A0h PHARLAPX Y PharLap inter-VM communications DLL 28A1h PharLap Y Y Y PharLap 386|DOS-Extender DOSXNT.386 28C0h VXD N Y Y Generic VxD for real and protected mode by Andrew Schulman in MSJ February 1993 28C1h PUSHKEYS VKD_Force_Keys device 28C2h VCR3D Virtual CR3, by A.Schulman in MSJ October 1992 2925h EDOS Y Y Enhanced DOS by Firefly Software 292Dh VSBPD Y Y Sound Blaster Pro 304Ch DWCFGMG.SYS Plug-and-Play configuration access 3098h VstlthD N N N for QEMM Stealth ROM mode 310Eh WPS N Y MS DevNet CD-ROM: Windows Process Status 313Bh PMC Power Management Coordinator 31CFh STAT.386 Ton Plooy's processor statistics VxD 32CBh VFRAD Y Y Dr.Franz - Simultan's diagnotics VFRAD.386 36AEh AIB-PC.386 Y Y Sunset Laboratory interface hardware driver 377Bh MX1501HAD Cherry keyboard chipcard reader 4321h POSTMSG Y Y (see #1996) 7A5Fh SIWVID Y Y Y Soft-ICE for Windows video driver 7FE0h VSWITCHD Y N by Jeff Prosise 7FE0h VWFD N Y Y reports windowed/fullscreen state; by Neil Sandlin of Microsoft, shipped with ANSIPLUS 7FE1h VWATCHD N Y Y basic driver w/ no functionality except tracing by Keith Jin of Microsoft PSS 7FE5h VFINTD N Y Y Virtual Floppy Interrupt trapper by Neil Sandlin of Microsoft 7FE7h VMPAGES N Y Y demonstration of exporting VxD services, by Neil Sandlin of Microsoft 7FE8h VPOSTD Y Y PostMessage() demo by Curtis J. Palmer of MS 7FE9h VIdleD N N N demonstration of Call_When_Idle function, by Bernie McIlroy of Microsoft 7FEBh VMIOD N N N Virtual Monitor I/O Traffic Device, by Neil Sandlin of Microsoft 7FEDh VMIRQD N N N Virtual Monitor IRQ Traffic Device, by Neil Sandlin of Microsoft 8888h VbillD Bill Potvin II's for reversing Compaq LTE video EEEEh VEPSD N N Virtual Extended Paging Services for Borland C++ v4.0 Note: The high bit of the VxD ID is reserved for future use. Originally, the next 10 bits were the OEM number which was assigned by Microsoft, and the low 5 bits were the device number. Currently, Microsoft assigns VxD IDs individually for each driver; send blank email to vxdid@microsoft.com for more information. --------W-2F1684BX0003----------------------- INT 2F - MS Windows - VPICD - GET API ENTRY POINT AX = 1684h BX = 0003h (virtual device ID for VPICD device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point 0000h:0000h if the VxD does not support an API --------W-2F1684BX0005----------------------- INT 2F - MS Windows - VTD - GET API ENTRY POINT AX = 1684h BX = 0005h (virtual device ID for VTD device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1969) 0000h:0000h if the VxD does not support an API (Table 1969) Call VTD.386 entry point with: AX = function number 0000h get VTD version number Return: AH = major version AL = minor version 0100h get current clock tick time Return: EDX:EAX = clock tick time in 840ns units since Windows was started 0101h get current system time in milliseconds Return: EAX = time in milliseconds that Windows has been running 0102h get current virtual machine time Return: EAX = cumulative amount of time the virtual machine has been active, in milliseconds Note: this entry point should only be called directly when TOOLHELP.DLL TimerCount() cannot be called SeeAlso: #0674,#0676,#0675 at INT 20"Windows" --------W-2F1684BX0009----------------------- INT 2F - MS Windows - REBOOT - GET API ENTRY POINT AX = 1684h BX = 0009h (virtual device ID for REBOOT device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1970) 0000h:0000h if the VxD does not support an API SeeAlso: INT 14/AH=17h"FOSSIL",INT 16/AX=E0FFh (Table 1970) Call REBOOT protected-mode entry point with: AX = function 0100h warm boot Return: never Note: broadcasts "Reboot_Processor" message, which is caught by the VKD device 0201h set KERNEL Ctrl-Alt-Del handler ES:DI -> new Ctrl-Alt-Del handler DS:SI -> KERNEL reboot sanity check byte Return: CF clear Notes: if an application installs its own handler and then chains to Windows' handler, Windows will no longer be able to detect hung applications, and will always produce an "Application not responding" dialog DS must contain a writable, fixed selector because the provided address is converted to a linear address before being stored when Ctrl-Alt-Del is pressed in the system VM, Reboot sets the sanity check byte to zero, schedules a 750ms wait, and then tests whether the check byte is still zero; if not, it displays a message that there is no hung application and then exits 0202h get KERNEL Ctrl-Alt-Del handler Return: CF clear ES:DI -> current Ctrl-Alt-Del handler Note: the default handler is located in KERNEL 0203h display "Application not responding" dialog box ES:DI -> ASCIZ name of hung application Return: never if user pressed Ctrl-Alt-Del a second time CF clear AX = result 0000h user pressed Esc 0001h user pressed Enter Note: this function is used by the default Windows Ctrl-Alt-Del handler 0204h set/reset protected-mode INT 01 handler CX:EDX -> new protected-mode INT 01 handler CX = 0000h restore protected-mode INT 01 handler Return: CF clear Notes: if CX is nonzero, the current handler address is saved internally before the new handler is set; this saved address is then used when CX is zero on entry used by Windows' default Ctrl-Alt-Del handler; actual fatal exit to DOS will be done on next INT 01 Warning: opened files are not closed and remain open as orphaned files in DOS Note: functions 0201h and 0203h are not useful outside the system VM SeeAlso: #0677,#0678 --------W-2F1684BX000C----------------------- INT 2F - MS Windows - VMD - GET API ENTRY POINT AX = 1684h BX = 000Ch (virtual device ID for VMD device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point 0000h:0000h if the VxD does not support an API --------W-2F1684BX0015----------------------- INT 2F - MS Windows - DOSMGR - GET API ENTRY POINT AX = 1684h BX = 0015h (virtual device ID for DOSMGR device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1971,#0686) 0000h:0000h if the VxD does not support an API (Table 1971) Call DOSMGR entry point with: AX = 0000h get DOSMGR version Return: CF clear AX = version (AH = major, AL = minor) AX = 0001h set critical focus Return: CF clear AX = 0002h crash current virtual machine Return: never Note: displays message box stating that "application has been stopped by the DOSMGR device" AX = 0003h enter critical section Note: this function assumes that the code for INT 2A/AX=8001h and INT 2A/AX=8002h have been modified for Windows AX = 0004h get VM ID byte Return: CF clear if successful ES:DI -> VM ID byte CF set on error Note: this function fails if the INT 2A modifications have not yet been applied AX = 0005h inform Windows of possible media change BL = drive number (00h=A:) Return: CF clear if successful CF set on error SeeAlso: #0686 at INT 20"Windows" --------W-2F1684BX0017----------------------- INT 2F U - MS Windows - SHELL - GET API ENTRY POINT AX = 1684h BX = 0017h (virtual device ID for SHELL device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1972) 0000h:0000h if the VxD does not support an API SeeAlso: AX=1684h/BX=0021h (Table 1972) Call SHELL entry point with: EDX = function number (0000h-0016h, mostly unknown) 0000h get version number Return: AX = version number EBX = system VM handle 0001h "SHELL_Get_SYSVM_Info" get system VM information Return: CF clear AX bit 0 set if system VM executing exclusively BX = background time slice priority CX = foreground time slice priority SI = minimum time slice in milliseconds 0002h "SHELL_Set_SYSVM_Info" set system VM information AX bit 0 set if system VM should execute exclusively (ignored?) BX = background time slice priority (1-10000) CX = foreground time slice priority (1-10000) SI = minimum time slice in milliseconds (1-10000) Return: CF clear if successful 0003h "SHELL_Crt_VM" create a virtual machine ES:EDI -> SEB structure (see #1973) Return: CF clear if successful EAX = VM handle CF set on error EDX,EAX = result from GetSetDetailedVMError() 0004h "SHELL_Destroy_VM" destroy a virtual machine EBX = VM handle (not system VM) Return: nothing 0005h "SHELL_Set_Focus" EBX = VM handle ECX = ??? Return: nothing 0006h "SHELL_Get_VM_State" EBX = VM handle (not system VM) ES:EDI -> ??? structure Return: CF clear if successful 0007h "SHELL_Set_VM_State" EBX = VM handle (not system VM) ES:EDI -> ??? structure 0008h "SHELL_Debug_Out" ??? Return: ??? Note: dummy function in retail version of MS Windows 0009h "SHELL_VMDA_Init" ??? Return: ??? 000Ah "SHELL_VMDA_Exit" ??? Return: ??? 000Bh "SHELL_Get_Message_Txt" ??? Return: ??? 000Ch "SHELL_Event_Complete" ??? Return: ??? 000Dh "SHELL_Get_Contention_Info" ??? Return: ??? 000Eh "SHELL_Get_Clip_Info" ??? Return: ??? 000Fh "SHELL_Set_Paste" ??? Return: ??? 0010h "SHELL_Switcher_Assist" ??? Return: ??? 0011h "SHELL_Get_FileSysChng" ??? Return: ??? 0012h "SHELL_Query_Destroy" ??? Return: ??? 0013h "SHELL_SetFocus_Cur_VM" set input focus to current VM ??? Return: ??? 0014h "SHELL_User_Busy_API" ??? Return: ??? 0015h "SHELL_Chng_Hot_Key" ??? Return: ??? 0016h "SHELL_Get_TermInfo" ??? Return: ??? Return: CF set if called from VM other than system VM EAX = FFFFFFFFh Note: except for function 0013h, this API may only be called from the system VM SeeAlso: #0687 at INT 20"Windows" Format of Shell Execution Block (SEB): Offset Size Description (Table 1973) 00h DWORD PIF flags (see #1974) 04h DWORD display flags (see #1975) 08h PWORD -> pathname of .EXE to run 0Eh PWORD -> argument list 14h PWORD -> working drive/directory 1Ah WORD desired number of V86 pages for virtual machine 1Ch WORD minimum number of V86 pages for VM 1Eh WORD foreground priority 20h WORD background priority 22h WORD maximum KB of EMS 24h WORD minimum KB of EMS 26h WORD maximum KB of XMS 28h WORD minimum KB of XMS 2Ah WORD ??? 2Ch WORD ??? 2Eh 128 BYTEs title Note: the PWORDs at offsets 08h,0Eh, and 14h consist of a DWORD offset followed by a WORD selector Bitfields for 386 Enhanced Mode PIF flags: Bit(s) Description (Table 1974) 0 exclusive use of processor when VM is fullscreen 1 VM runs in background 2 VM runs in window 3-4 ??? 5 Alt-Tab reserved 6 Alt-Esc reserved 7 Alt-Space reserved 8 Alt-Enter reserved 9 Alt-PrtSc reserved 10 PrtSc reserved 11 Ctrl-Esc reserved 12 VM will release idle time slice 13 VM not allowed to use high mem 14 unknown 15 VM expanded mem not pageable 16 VM extended mem not pageable 17 Fast paste from clipboard enabled 18 VM app memory not pageable 30 Close VM when app exits Bitfields for SHELL display options: Bit(s) Description (Table 1975) 0 emulate text mode 1 monitor text port 2 monitor low graphics port 3 monitor high graphics port 7 Retain video memory --------W-2F1684BX0021----------------------- INT 2F U - MS Windows - PAGEFILE - GET API ENTRY POINT AX = 1684h BX = 0021h (virtual device ID for PAGEFILE device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1976) 0000h:0000h if the VxD does not support an API SeeAlso: AX=1684h/BX=0017h (Table 1976) Call PAGEFILE entry point with: AX = function 0000h get version Return: CF clear AX = version (AH = major, AL = minor) 0001h get swap file info DS:SI -> 128-byte buffer for swap file full pathname DS:DI -> 128-byte buffer for SPART.PAR full pathname Return: CF clear AL = pager type (see #1977) AH = flags bit 7: swap file corrupted ECX = maximum size of swap file DS:SI buffer filled if paging enabled DS:DI buffer filled if permanent swap file 0002h delete permanent swap file on exit Return: CF clear 0003h get current temporary swap file size Return: CF clear DX:AX = current swap file size in bytes 0000h:0000h if permanent swap file Note: this API is only available in protected mode, and may only be called from the system VM SeeAlso: #0691 at INT 20"Windows" (Table 1977) Values for MS Windows PAGEFILE pager type: 00h paging disabled 01h MSDOS 02h BIOS 03h 32-bit disk access SeeAlso: #1976 --------x-2F1684BX0034----------------------- INT 2F - Intel Plug-and-Play - CONFIGURATION MANAGER - GET ENTRY POINT AX = 1684h BX = 0034h (ID for Configuration Manager) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> API entry point (see #1978) 0000h:0000h if Configuration Manager not loaded Note: this API is often provided by a DOS device driver, in which case it is available whether or not MSWindows is running Index: installation check;Plug-and-Play Configuration Manager SeeAlso: AX=1684h/BX=304Ch (Table 1978) Call Configuration Manager entry point with: AX = function 0000h "CM_GetVersion" get supported DDI version Return: AH = BCD major version AL = BCD minor version BX = number of devices identified by configuration Note: returns AX = 0000h if no config manager installed 0001h "CM_GetConfig" get device configuration BX = device index ES:DI -> buffer for configuration information (see #1980) Return: AX = status 0000h successful ES:DI buffer filled other error code (0001h = index out of range) 0002h "CM_LockConfig" lock device configuration ES:DI -> configuration information (see #1980) Return: AX = status 0000h successful ES:DI buffer filled with assigned config 0001h resources conflict 0002h invalid request or configuration info 0003h "CM_UnlockConfig" unlock device configuration ES:DI -> configuration information (see #1980) Return: AX = status 0000h successful ES:DI buffer filled with assigned config 0001h invalid request or configuration info 0004h "CME_QueryResources" get hot-swappable resources ES:DI -> configuration information (see #1980) Return: AX = status (see #1979) 0005h "CME_AllocResources" remove resources from available pool ES:DI -> configuration information (see #1980) Return: AX = status (see #1979) 0006h "CME_DeallocResources" return resources to available pool ES:DI -> configuration information (see #1980) Return: AX = status (see #1979) (Table 1979) Values for Configuration Manager status: 00h successful 01h device not found, configuration error 02h I/O port unavailable 04h IRQ unavailable 08h DMA channel unavailable 10h memory range unavailable SeeAlso: #1978 Format of Configuration Information Structure: Offset Size Description (Table 1980) 00h DWORD bus ID 04h DWORD device ID 08h DWORD serial number 0Ch DWORD logical ID 10h DWORD flags ---ISA bus--- 14h BYTE Card Select Number 15h BYTE logical device number 16h WORD Read Data port ------ 18h WORD number of memory windows 1Ah 9 DWORDs physical base addresses of memory windows 3Eh 9 DWORDs length of memory windows 62h 9 WORDs memory window attributes 74h WORD number of I/O ports 76h 20 WORDs I/O port base addresses B6h 20 WORDs lengths of I/O port ranges F6h WORD number of IRQs F8h 7 BYTEs IRQ registers FFh 7 BYTEs IRQ attributes 106h WORD number of DMA channels 108h 7 BYTEs DMA channels used 10Fh 7 WORDs DMA channel attributes 11Dh 3 BYTEs reserved SeeAlso: #1978 --------W-2F1684BX0444----------------------- INT 2F - MS Windows - VADMAD - GET API ENTRY POINT AX = 1684h BX = 0444h (virtual device ID for VADMAD device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1981) 0000h:0000h if the VxD does not support an API (Table 1981) Call VADMAD entry point with: DX = operation 0000h set VADMAD mode AX = desired mode 0001h set VADMAD channel AX = desired channel Note: after setting mode/channel, start the DMA operation with an OUT to I/O port 0Bh (channels 0-3) or D6h (channels 4-7) SeeAlso: #0674 at INT 20"Windows" --------W-2F1684BX0750----------------------- INT 2F - MS Windows - VSWITCHD - GET API ENTRY POINT AX = 1684h BX = 0750h (virtual device ID for VSWITCHD device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1982) 0000h:0000h if the VxD does not support an API (Table 1982) Call VSWITCHD entry point with: AX = function 0000h toggle windowed mode (simulate Alt-Enter keypress) Return: nothing 0001h get windowed mode Return: CF clear if VM is windowed CF set if VM is full-screen --------W-2F1684BX28A0----------------------- INT 2F - MS Windows - PHARLAPX - GET API ENTRY POINT AX = 1684h BX = 28A0h (virtual device ID for PHARLAPX device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1983) 0000h:0000h if the VxD does not support an API (Table 1983) Call PHARLAPX VxD entry point with: AX = function 0001h get PHARLAP.386 version Return: AX = version number (AH = major, AL = minor) ---queue functions--- 0101h allocate a new message queue CX = size of queue data buffer in bytes Return: DX:AX = handle for new queue, or 0000h:0000h on error 0102h allocate a new key queue CX = size of queue data buffer in bytes EDX = VM handle into which keys will be pasted Return: DX:AX = handle for new queue, or 0000h:0000h on error 0103h free message queue EDX = queue handle Return: AX = status (0000h,0003h,0007h) (see #1984) 0104h free key queue EDX = queue handle Return: AX = status (0000h,0003h,0005h) (see #1984) 0105h add message to communications queue EDX = queue handle BX = length of message data in bytes CX = length of message header in bytes ES:(E)SI -> message header GS:(E)DI -> message data Return: AX = status (0000h-0003h,0007h) (see #1984) 0106h remove message from queue EDX = queue handle CX = length of buffer in bytes ES:(E)SI -> buffer for message Return: AX = status (0000h,0003h,0006h,0007h,0008h) (see #1984) CX = length of returned message (if AX=0000h or 0008h) 0107h flush queue (remove all data) EDX = queue handle Return: AX = status (0000h,0003h) (see #1984) 0108h add PasteKey structure(s) to key queue EDX = queue handle CX = number of PasteKey structures in buffer ES:(E)SI -> PasteKey array (see #1985) Return: AX = status (0000h-0003h) (see #1984) 0109h register enqueueing callback function EDX = queue handle ECX = function argument ES:(E)SI -> callback function Return: AX = status (0000h,0003h,0009h) (see #1984) 010Ah register dequeueing callback function EDX = queue handle ECX = function argument ES:(E)SI -> callback function Return: AX = status (0000h,0003h,0009h) (see #1984) 010Bh unregister enqueueing callback function EDX = queue handle Return: AX = status (0000h,0003h,0009h) (see #1984) 010Ch unregister dequeueing callback function EDX = queue handle Return: AX = status (0000h,0003h,0009h) (see #1984) 010Dh get message queue status EDX = queue handle Return: AX = status (0000h,0003h) (see #1984) CX = number of pending messages 010Eh peek at message in queue EDX = queue handle BX = number of message in queue (0000h = first) CX = size of buffer in bytes ES:(E)SI -> buffer for message Return: AX = status (0000h,0003h,0006h,0008h) (see #1984) CX = length of returned message (if AX=0000h or 0008h) 010Fh peek at last message in queue EDX = queue handle CX = size of buffer in bytes ES:(E)SI -> buffer for message Return: AX = status (0000h,0003h,0006h,0008h) (see #1984) CX = length of returned message (if AX=0000h or 0008h) 0110h replace last message in queue EDX = queue handle CX = length of message header in bytes BX = length of message data in bytes ES:(E)SI -> message header GS:(E)DI -> message data Return: AX = status (0000h,0002h,0003h) (see #1984) 0111h set permitted message count for queue EDX = queue handle CX = maximum number of messages to enqueue (FFFFh = unlimited) Return: AX = status (0000h,0003h) (see #1984) ---generalized VxD services--- 0202h call VxD function ES:(E)BX -> in/out register-set buffer Return: buffer updated 0203h map flat ??? --system register functions--- 0301h read system registers into buffer ES:(E)SI -> 512-byte buffer Return: AX = 0000h buffer filled (mostly zeros) 0302h copy linear memory into buffer EDX = linear address CX = number of bytes to copy ES:(E)SI -> buffer Return: AX = 0000h 0303h copy data into linear memory EDX = linear address CX = number of bytes to copy ES:(E)SI -> buffer Return: AX = 0000h 0304h freeze VM ??? 0305h unfreeze VM ??? ---name registration functions--- 0401h register name EDX = magic number to associate with name ES:(E)SI -> name to register Return: AX = status (0000h,0009h) (see #1984) 0402h unregister name ES:(E)SI -> name to be unregistered Return: AX = status (0000h,0009h) (see #1984) 0403h look up name ES:(E)SI -> name to look up Return: DX:AX = magic number or 0000h:0000h if not registered 0404h get name list handle Return: DX:AX = name list handle 0000h:0000h if not initialized ---special DOS server routines (undocumented)--- 0501h register 0502h unregister 0503h validate VM 0504h get INT9 count 0505h get screen line 0506h get shift status 0507h get server PB pointer 0508h initialize DOS shell 0509h get last VM handle (Table 1984) Values for PHARLAPX function status: 00h successful 01h data is too large to fit in queue 02h queue is full 03h invalid queue handle 04h invalid VM handle for queue 05h error starting a paste operation 06h queue is empty 07h a VM is blocked waiting on the queue 08h message was too long (truncated) 09h unable to register or unregister specified callback SeeAlso: #1983 Format of PHARLAPX PasteKey structure: Offset Size Description (Table 1985) 00h BYTE ASCII code 01h BYTE scan code (see #0005) 02h WORD shift states SeeAlso: #1983 Format of PHARLAPX VxD-call register structure: Offset Size Description (Table 1986) 00h DWORD call number 04h WORD input register map (see #1987) 06h WORD output register map (see #1987) 08h 7 DWORDs values for EAX, EBX, ECX, EDX, EBP, ESI, EDI on call 24h 4 WORDs values for DS, ES, FG, GS on call 2Ch DWORD EFLAGS on call 30h 7 DWORDs returned values of EAX, EBX, ECX, EDX, EBP, ESI, EDI 4Ch 4 WORDs returned values of DS, ES, FS, GS 54h DWORD returned EFLAGS SeeAlso: #1983 Bitfields for PHARLAPX VxD-call register map: Bit(s) Description (Table 1987) 0 value in EAX field is valid 1 value in EBX field is valid 2 value in ECX field is valid 3 value in EDX field is valid 4 value in EBP field is valid 5 value in ESI field is valid 6 value in EDI field is valid 7 value in DS field is valid 8 value in ES field is valid 9 value in FS field is valid 10 value in GS field is valid 11 value in EFLAGS field is valid SeeAlso: #1986 --------W-2F1684BX2925----------------------- INT 2F - MS Windows - EDOS - GET API ENTRY POINT AX = 1684h BX = 2925h (virtual device ID for EDOS device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1988) 0000h:0000h if the VxD does not support an API (Table 1988) Call EDOS entry point with: AX = 0000h get EDOS version number Return: AH = major version AL = minor version AX = 0001h display message CX = 0 DX:BX -> ASCIZ Message AX = 0002h get EDOS error coded Return: EAX = time in milliseconds that Windows has been running AX = 0003h execute windows program Return: EAX = cumulative amount of time the virtual machine has been active, in milliseconds AX = 0008h get/set priority BX = 0000h??? foreground 0001h background DI = 0000h get 0001h set DX = priority setting Return: CX = foreground priority DX = background priority BX:AX = flags 00000001h exclusive ON 00000010h background ON SI = CPU percentage --------x-2F1684BX304C----------------------- INT 2F - Intel Plug-and-Play - CONFIGURATION ACCESS - GET ENTRY POINT AX = 1684h BX = 304Ch (ID for Configuration Access) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> API entry point (see #1989) 0000h:0000h if Configuration Access not loaded Note: this API is often provided by a DOS device driver, in which case it is available whether or not MSWindows is running Index: installation check;Plug-and-Play Configuration Access SeeAlso: AX=1684h/BX=0034h (Table 1989) Call Plug-and-Play Configuration Access entry point with: AX = function 0000h "CA_GetVersion" Return: AX = BCD version (AH = major, AL = minor) 0001h "CA_PCI_Read_Config_Byte" (see also INT 1A/AX=B108h) !!! 0002h "CA_PCI_Read_Config_Word" (see also INT 1A/AX=B109h) 0003h "CA_PCI_Read_Config_DWord" (see also INT 1A/AX=B10Ah) 0004h "CA_PCI_Write_Config_Byte" (see also INT 1A/AX=B10Bh) 0005h "CA_PCI_Write_Config_Word" (see also INT 1A/AX=B10Ch) 0006h "CA_PCI_Write_Config_DWord" (see also INT 1A/AX=B10Dh) 0007h "CA_PCI_Generate_Special_Cycle" (see also INT 1A/AX=B106h) 0008h "CA_PCI_Get_Routing_Options" (see also INT 1A/AX=B10Eh) 0009h invalid function 000Ah invalid function 000Bh "CA_PnPISA_Get_Info" 000Ch "CA_PnPISA_Read_Config_Byte" 000Dh "CA_PnPISA_Write_Config_Byte" 000Eh "CA_PnPISA_Get_Resource_Data" 000Fh invalid function 0010h "CA_EISA_Get_Board_ID" 0011h "CA_EISA_Get_Slot_Config" 0012h "CA_EISA_Get_SlotFunc_Config" 0013h "CA_EISA_Clear_NVRAM_Config" 0014h "CA_EISA_Write_Config" 0015h invalid function 0016h "CA_ESCD_Get_Info" 0017h "CA_ESCD_Read_Config" 0018h "CA_ESCD_Write_Config" 0019h invalid function 001Ah "CA_Acfg_PCI_Manage_IRQs" DL = IRQ??? ES:DI -> ??? Return: AX = status 001Bh "CA_Acfg_PCI_Get_Routing_Options" ES:DI -> IRQ routing table header (see #0666 at INT 1A/AX=B406h) Return: AX = status 001Ch-001Fh invalid functions 0020h "CA_PnPB_Get_Num_Sys_Dev_Nodes" 0021h "CA_PnPB_Get_Sys_Dev_Node" 0022h "CA_PnPB_Set_Sys_Dev_Node" 0023h "CA_PnPB_Get_Stat_Res_Info" 0024h "CA_PnPB_Set_Stat_Res_Info" Return: AX = FFFFh if unsupported function --------W-2F1684BX310E----------------------- INT 2F - MS Windows - WPS - GET API ENTRY POINT AX = 1684h BX = 310Eh (virtual device ID for WPS device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1990) 0000h:0000h if the VxD does not support an API (Table 1990) Call WPS protected-mode entry point with: DX = function 0000h get WPS.386 version Return: CF clear AX = version (AH = major, AL = minor) 0001h get number of installed VxDs Return: CF clear AX = number of installed VxDs 0002h get VxD characteristics AX = number of VxD ES:BX -> buffer for VxD characteristics structure (see #1991) Return: CF clear ES:BX buffer filled Format of WPS.386 VxD characteristics structure: Offset Size Description (Table 1991) 00h WORD VxD ID number 02h BYTE VxD minor version 03h BYTE VxD major version 04h BYTE DDK minor version 05h BYTE DDK major version 06h WORD flags bit 0: V86 API supported bit 1: PM API supported bit 2: services supported 08h DWORD start order 0Ch 9 BYTEs ASCIZ VxD name --------W-2F1684BX31CF----------------------- INT 2F - MS Windows - STAT.386 - GET API ENTRY POINT AX = 1684h BX = 31CFh (virtual device ID for STAT.386) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1992) 0000h:0000h if the VxD does not support an API (Table 1992) Call STAT.386 entry point with: AX = function 0000h get version Return: AX = STAT.386 version (AH = major, AL = minor) 0001h execute RDMSR/WRMSR/RDTSC BH = 00h BL = second opcode byte (30h=WRMSR,31h=RDTSC,32h=RDMSR) EDX:EDI = value to be written (for BL=30h) ECX = MSR number for RDMSR/WRMSR Return: EDX:EAX = value read (RDTSR/RDMSR only) ----------2F1684BX377B----------------------- INT 2F - MS Windows - MX1501HAD - GET API ENTRY POINT AX = 1684h BX = 377Bh (virtual device ID for MX1501HAD device) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1993) 0000h:0000h if the VxD does not support an API Note: The drivers VCMD95C.VXD and VCMD.386 are part of the driver disks provided with the chip-card-reader/keyboard combination MX 1501 HAD, produced by Cherry (Table 1993) Call CHERRY VCMD95C.VXD entry point with: AX = function 0001h get version Return: AX = version number (0100h) (AH = major, AL = minor) 0002h hook INT 09 (and 8???) 0003h unhook INT 09 (and 8???) 0004h get number of bytes in FIFO Return: AX = bytes in FIFO 0005h get next FIFO-data Return: AX = data BL = port number BH = direction (1=in, 0=out) DX:CX = timestamp 0006h clear FIFO 0007h output byte DX = port number BL = keyboard command Return: data in FIFO (see #1995) (value, port, in/out, timestamp) 0008h input byte DX = port number Return: data in FIFO (see #1995) (value, port, in/out, timestamp) 0009h input byte immediately DX = port number Return: AX = data 000Ah read next FIFO data (nondestructive) Return: AX = data BL = port number BH = direction (1=in, 0=out) DX:CX = timestamp 000Bh get timestamp Return: DX:CX = timestamp (in ms) 000Ch enable IRQ 1 000Dh disable IRQ 1 000Eh enable data retrieval Note: Sets a flag in the internal mode-byte which tells the driver to recognize the data 000Fh disable data retrieval Note: resets a flag in the internal mode-byte 0010h get retrieval mode Return: AX = current retrieval mode 0011h set retrieval mode BX = new retrieval mode (see #1994) Return: AX = old retrieval mode 0012h get command value Return: AX = command value 0013h set command value BX = command value Bitfields for retrieval mode: Bit(s) Description (Table 1994) 0 enable data retrieval 1 0 = interrupt-driven 1 = polling mode 2 0 = read port 60h everytime 1 = read port 60h only when OBF of port 64h is set 3 0 = don't call old INT 9 1 = call INT 9 before our INT-handler 4-7 reserved SeeAlso: #1993,#1995 Structure of FIFO entry (1024 entries in FIFO): Offset Size Description (Table 1995) 00h BYTE data byte 01h BYTE I/O port 02h BYTE direction (1=in, 0=out) 03h BYTE reserved 04h DWORD timestamp SeeAlso: #1993,#1994 --------W-2F1684BX8888----------------------- INT 2F - MS Windows - POSTMSG - GET API ENTRY POINT AX = 1684h BX = 8888h (virtual device ID for POSTMSG device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1996,#1998) 0000h:0000h if the VxD does not support an API (Table 1996) Call POSTMSG protected-mode entry point with: AX = window handle CX:BX -> callback procedure (see #1997) Return: nothing Note: this call registers a WinApp with the VxD; the callback must be in a fixed, non-discardable code segment SeeAlso: #1998 (Table 1997) Values POSTMSG callback routine is called with: STACK: DWORD "lParam" parameter from DOSApp WORD "wParam" parameter from DOSApp WORD Windows message number (WM_USER + 100) DWORD registered hwnd (Table 1998) Call POSTMSG V86-mode entry point with: BX = wParam value to pass to protected-mode callback DX:AX = lParam value to pass to protected-mode callback Return: CF clear if successful CF set on error (no WinApp registered) SeeAlso: #1996 --------W-2F1684BX8888----------------------- INT 2F - MS Windows - VbillD - GET API ENTRY POINT AX = 1684h BX = 8888h (virtual device ID for VbillD device) (see #1968) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #1999) 0000h:0000h if the VxD does not support an API (Table 1999) Call VbillD entry point with: AX = function 0001h set reverse video 0002h set normal video Return: ??? --------W-2F1685----------------------------- INT 2F - MS Windows - SWITCH VMs AND CALLBACK AX = 1685h BX = VM ID of virtual machine to switch to CX = flags (see #2000) DX:SI = priority boost (refer to VMM.INC) ES:DI -> FAR procedure to callback Return: CF set on error AX = error code 01h invalid VM ID 02h invalid priority boost 03h invalid flags CF clear if successful event will be or has been called Notes: some DOS devices, such as networks, need to call functions in a specific VM. This call forces the appropriate VM to be installed. the callback procedure must preserve all registers and return with IRET SeeAlso: AX=1683h,INT 15/AX=1117h,AX=DB06h"WINGO" Bitfields for VM switching flags: Bit(s) Description (Table 2000) 0 wait until interrupts enabled 1 wait until critical section unowned 2-15 reserved (zero) --------E-2F1686----------------------------- INT 2F - DOS Protected-Mode Interface - DETECT MODE AX = 1686h Return: AX = 0000h if operating in protected mode under DPMI (INT 31 available) AX nonzero if in real/V86 mode or no DPMI (INT 31 not available) SeeAlso: AX=1687h --------E-2F1687----------------------------- INT 2F - DOS Protected-Mode Interface - INSTALLATION CHECK AX = 1687h Return: AX = 0000h if installed BX = flags bit 0: 32-bit programs supported CL = processor type (02h=80286, 03h=80386, 04h=80486) DH = DPMI major version DL = two-digit DPMI minor version (binary) SI = number of paragraphs of DOS extender private data ES:DI -> DPMI mode-switch entry point (see #2001) AX nonzero if not installed SeeAlso: AX=1686h,AX=43E0h,AX=DE01h/BX=4450h,AX=FB42h/BX=0001h SeeAlso: INT 31/AX=0400h,INT 31/AX=5702h,INT D4/AH=10h (Table 2001) Call DPMI mode switch entry point with: AX = flags bit 0: set if 32-bit program ES = real mode segment of buffer for DPMI private data (ignored if SI was zero) Return: CF set on error program still in real mode AX = error code (DPMI 1.0+) 8011h unable to allocate all necessary descriptors 8021h 32-bit program specified, but 16-bit DPMI host CF clear if successful CS = 16-bit selector corresponding to real-mode CS SS = selector corresponding to real-mode SS (64K limit) DS = selector corresponding to real-mode DS (64K limit) ES = selector to program's PSP (100h byte limit) FS = GS = 0 high word of ESP = 0 if 32-bit program program now in protected mode Note: this entry point is only called for the initial switch to protected mode --------W-2F1688BX0BAD----------------------- INT 2F U - MS Windows 3.0, 386MAX v6.01 - GET ALIAS SELECTOR TO LDT AX = 1688h BX = 0BADh Return: AX = 0000h if supported BX = alias selector for LDT Note: use the LSL instruction or GetSelectorLimit() to find LDT size this call should be considered obsolete for Windows 3.1+, as the alias selector can be retrieved via the API entry point for "MS-DOS" retrieved from INT 2F/AX=168Ah (see #2003) --------W-2F1689----------------------------- INT 2F U - MS Windows 3.0+ - KERNEL IDLE CALL AX = 1689h ??? Return: ??? SeeAlso: AX=1680h,INT 15/AX=1000h,INT 28 --------E-2F168A----------------------------- INT 2F - DPMI 0.9+ - GET VENDOR-SPECIFIC API ENTRY POINT AX = 168Ah DS:(E)SI = selector:offset of ASCIZ vendor name (see #2002) Return: AL = status 00h successful ES:(E)DI -> extended API entry point 8Ah unsuccessful Notes: the vendor name is used to determine which entry point to return; it is case-sensitive available in protected mode only 32-bit applications use ESI and EDI, 16-bit applications use SI and DI this call is present but not documented for DPMI 0.9 the Borland C++ 3.1 DPMILOAD does not handle requests for entry points other than the MS-DOS one gracefully, producing an unhandled exception report; this has been fixed in the Borland Pascal 7 version SeeAlso: INT 31/AX=0A00h,INT 31/AH=57h (Table 2002) Values for DPMI vendor-specific API names: "MS-DOS" MS Windows and 386MAX v6.00+ (see #2003) "386MAX" 386MAX v6.00+ "HELIX_DPMI" Helix Netroom's DPMI server "Phar Lap" Phar Lap 286|DOS-Extender RUN286 (see #2004) "RATIONAL DOS/4G" DOS/4G, DOS/4GW (Table 2003) Call Windows-support ("MS-DOS") entry point with: AX = 0100h get LDT alias selector Return: CF clear if successful AX = alias selector CF set on error (Table 2004) Call Phar Lap RUN286 entry point with: AX = 0000h (function "load MSW") BX = new value for MSW register (low word of CR0) Return: ??? --------W-2F168B----------------------------- INT 2F - MS Windows 3.1 - SET FOCUS TO SPECIFIED VIRTUAL MACHINE AX = 168Bh BX = virtual machine ID (see AX=1683h), 0000h for current DOS box Return: AL = 00h if focus set to specified VM Notes: documented on the Microsoft Developer's Network CD-ROM if the VM is a windowed DOS box, it will be set to full screen SeeAlso: AX=1683h --------W-2F168C----------------------------- INT 2F - MS Windows 3.1 - RESTART COMMAND AX = 168Ch ??? Return: ??? Note: WIN.COM executes specified application --------W-2F168EDX0000----------------------- INT 2F - Windows95 - TITLE - SET APPLICATION TITLE AX = 168Eh DX = 0000h ES:DI -> ASCIZ application title (max 79 chars+NUL) Return: AX = status 0000h failed 0001h successful Note: if ES:DI is 0000h:0000h or points at an empty string, the current title is removed BUG: this function can return a successful status even though the title was not changed SeeAlso: AX=168Eh/DX=0001h,AX=168Eh/DX=0002h --------W-2F168EDX0001----------------------- INT 2F - Windows95 - TITLE - SET VIRTUAL MACHINE TITLE AX = 168Eh DX = 0001h ES:DI -> ASCIZ virtual machine title (max 29 chars+NUL) Return: AX = status 0000h failed 0001h successful Notes: if ES:DI is 0000h:0000h or points at an empty string, the current title is removed the VM title should only be changed on explicit instruction from the user BUG: this function can return a successful status even though the title was not changed SeeAlso: AX=168Eh/DX=0000h,AX=168Eh/DX=0003h --------W-2F168EDX0002----------------------- INT 2F - Windows95 - TITLE - GET APPLICATION TITLE AX = 168Eh DX = 0002h ES:DI -> buffer for ASCIZ application title CX = size of buffer in bytes Return: AX = status 0000h failed 0001h successful Desc: copy as much of the application's window title as possible to the given buffer, appending a terminating NUL to the buffer SeeAlso: AX=168Eh/DX=0000h,AX=168Eh/DX=0003h --------W-2F168EDX0003----------------------- INT 2F - Windows95 - TITLE - GET VIRTUAL MACHINE TITLE AX = 168Eh DX = 0003h ES:DI -> buffer for ASCIZ virtual-machine title CX = size of buffer in bytes Return: AX = status 0000h failed 0001h successful Desc: copy as much of the virtual machine's title as possible to the given buffer, appending a terminating NUL to the buffer SeeAlso: AX=168Eh/DX=0001h,AX=168Eh/DX=0002h --------W-2F168FDH00------------------------- INT 2F - Windows95 - CLOSE-AWARENESS - ENABLE/DISABLE CLOSE COMMAND AX = 168Fh DH = 00h DL = new state 00h disabled 01h enabled Return: AX = status 0000h successful else failed Desc: enable or disable the system menu Close command for an application SeeAlso: AX=168Fh/DH=01h,AX=168Fh/DH=02h --------W-2F168FDH01------------------------- INT 2F - Windows95 - CLOSE-AWARENESS - QUERY CLOSE AX = 168Fh DH = 01h DL = 00h (reserved) Return: AX = status 0000h Close command selected but not yet acknowledged 0001h Close command issued and acknowledged 168Fh Close command not selected -- application should continue Desc: determine whether the user has requested that the application be closed by selecting the system menu's Close option SeeAlso: AX=168Fh/DH=00h,AX=168Fh/DH=02h --------W-2F168FDH02------------------------- INT 2F - Windows95 - CLOSE-AWARENESS - ACKNOWLEDGE CLOSE AX = 168Fh DH = 02h DL = 00h (reserved) Return: AX = status 0000h successful else failed Note: once a Close command has been issued, no further keyboard input is available to the application until it calls this function to acknowledge the Close request SeeAlso: AX=168Fh/DH=00h,AX=168Fh/DH=03h --------W-2F168FDH03------------------------- INT 2F - Windows95 - CLOSE-AWARENESS - CANCEL CLOSE AX = 168Fh DH = 03h DL = 00h (reserved) Return: AX = status 0000h successful else failed Desc: cancels a close request which has already been acknowledged if the application determines that it will not exit at this time SeeAlso: AX=168Fh/DH=00h,AX=168Fh/DH=03h --------W-2F1700----------------------------- INT 2F - MS Windows "WINOLDAP" - IDENTIFY WinOldAp VERSION AX = 1700h Return: AX = 1700h if this version of WINOLDAP doesn't support clipboard AX <> 1700h AL = WINOLDAP major version AH = WINOLDAP minor version Program: WinOldAp (WINOLDAP.MOD) is a Microsoft Windows extension supporting "old" (character-mode) application access to Dynamic Data Exchange, menus, and the Windows clipboard. Note: this installation check DOES NOT follow the format used by other software of returning AL=FFh SeeAlso: AX=1701h,AX=4601h Index: installation check;WINOLDAP --------W-2F1701----------------------------- INT 2F - MS Windows "WINOLDAP" - OPEN CLIPBOARD AX = 1701h Return: AX = status nonzero success 0000h clipboard is already open SeeAlso: AX=1700h,AX=1702h,AX=1703h,AX=1704h,INT 16/AX=CB00h --------W-2F1702----------------------------- INT 2F - MS Windows "WINOLDAP" - EMPTY CLIPBOARD AX = 1702h Return: AX = status nonzero clipboard has been emptied 0000h failure SeeAlso: AX=1700h,AX=1701h,AX=1703h,AX=1704h,INT 16/AX=CB05h --------W-2F1703----------------------------- INT 2F - MS Windows "WINOLDAP" - SET CLIPBOARD DATA AX = 1703h DX = clipboard format supported by WinOldAp (see #2005) ES:BX -> data (see #2006,#2007) SI:CX = size of data Return: AX = status nonzero data copied into the Clipboard 0000h failure SeeAlso: AX=1701h,AX=1705h,INT 16/AX=CB04h (Table 2005) Values for WinOldAp clipboard format: 01h text 02h bitmap 03h metafile picture 04h SYLK 05h DIF 06h TIFF 07h OEM text 08h DIB bitmap 80h special format (used by Windows WRITE, maybe other Windows applets???) 81h DSP text 82h DSP bitmap Format of Windows Clipboard bitmap: Offset Size Description (Table 2006) 00h WORD type (0000h) 02h WORD width of bitmap in pixels 04h WORD height of bitmap in pixels 06h WORD bytes per line 08h BYTE number of color planes 09h BYTE number of adjacent color bits in pixel 0Ah DWORD pointer to start of data 0Eh WORD width in 0.1mm units 10h WORD height in 0.1mm units 12h N BYTEs bitmap data Format of Windows metafile picture: Offset Size Description (Table 2007) 00h WORD mapping mode 02h WORD X extent 04h WORD Y extent 06h WORD picture data --------W-2F1704----------------------------- INT 2F - MS Windows "WINOLDAP" - GET CLIPBOARD DATA SIZE AX = 1704h DX = clipboard format supported by WinOldAp (see #2005) Return: DX:AX = size of data in bytes, including any headers 0000h:0000h if no data in this format in the Clipboard Note: Windows reportedly rounds up the size of the data to a multiple of 32 bytes SeeAlso: AX=1700h,AX=1703h,AX=1705h --------W-2F1705----------------------------- INT 2F - MS Windows "WINOLDAP" - GET CLIPBOARD DATA AX = 1705h DX = clipboard format supported by WinOldAp (see #2005) ES:BX -> buffer Return: AX = status nonzero success 0000h error, or no data in this format in Clipboard SeeAlso: AX=1700h,AX=1704h,INT 16/AX=CB03h --------W-2F1708----------------------------- INT 2F - MS Windows "WINOLDAP" - CloseClipboard AX = 1708h Return: AX = status 0000h failure nonzero success --------W-2F1709----------------------------- INT 2F - MS Windows "WINOLDAP" - COMPACT CLIPBOARD AX = 1709h SI:CX = desired size in bytes Return: DX:AX = number of bytes in largest block of free memory Note: WinOldAp is responsible for including the size of any headers --------W-2F170A----------------------------- INT 2F - MS Windows "WINOLDAP" - GET DEVICE CAPABILITIES AX = 170Ah DX = GDI information index (see #2008) Return: AX = integer value of the desired item (see #2009,#2010,#2011,#2012,#2013,#2014,#2015) Note: This function returns the device-capability bits for the given display (Table 2008) Values for GDI information index: 00h device driver version 02h device classification 04h width in mm 06h height in mm 08h width in pixels 0Ah height in pixels 0Ch bits per pixel 0Eh number of bit planes 10h number of brushes supported by device 12h number of pens supported by device 14h number of markers supported by device 16h number of fonts supported by device 18h number of colors 1Ah size required for device descriptor 1Ch curve capabilities 1Eh line capabilities 20h polygon capabilities 22h text capabilities 24h clipping capabilities 26h bitblt capabilities 28h X aspect 2Ah Y aspect 2Ch length of hypotenuse of aspect 58h logical pixels per inch of width 5Ah logical pixels per inch of height SeeAlso: #2009,#2010,#2011,#2012,#2013,#2014,#2015 (Table 2009) Values for device classification: 00h vector plotter 01h raster display 02h raster printer 03h raster camera 04h character-stream, PLP 05h Metafile, VDM 06h display-file SeeAlso: #2008,#2010,#2011,#2012,#2013,#2014,#2015 Bitfields for curve capabilities: Bit(s) Description (Table 2010) 0 circles 1 pie wedges 2 chord arcs 3 ellipses 4 wide lines 5 styled lines 6 wide styled lines 7 interiors SeeAlso: #2008,#2009,#2011,#2012,#2013,#2014,#2015 Bitfields for line capabilities: Bit(s) Description (Table 2011) 1 polylines 2 markers 3 polymarkers 4 wide lines 5 styled lines 6 wide styled lines 7 interiors SeeAlso: #2008,#2009,#2010,#2012,#2013,#2014,#2015 Bitfields for polygon capabilities: Bit(s) Description (Table 2012) 0 polygons 1 rectangles 2 trapezoids 3 scanlines 4 wide borders 5 styled borders 6 wide styled borders 7 interiors SeeAlso: #2008,#2009,#2010,#2011,#2013,#2014,#2015 Bitfields for text capabilities: Bit(s) Description (Table 2013) 0 output precision character 1 output precision stroke 2 clippping precision stroke 3 90-degree character rotation 4 arbitrary character rotation 5 independent X and Y scaling 6 double-size 7 integer scaling 8 continuous scaling 9 bold 10 italic 11 underline 12 strikeout 13 raster fonts 14 vector fonts 15 reserved SeeAlso: #2008,#2009,#2010,#2011,#2012,#2014,#2015 (Table 2014) Values for clipping capabilities: 00h none 01h clipping to rectangles SeeAlso: #2008,#2009,#2010,#2011,#2012,#2013,#2015 Bitfields for raster capabilities: Bit(s) Description (Table 2015) 0 simple bitBLT 1 device requires banding support 2 device requires scaling support 3 supports >64K bitmap SeeAlso: #2008,#2009,#2010,#2011,#2012,#2013,#2014 ----------2F18------------------------------- INT 2F U - MS-Manager AH = 18h ??? Return: ??? --------l-2F1900----------------------------- INT 2F U - DOS 4.x only SHELLB.COM - INSTALLATION CHECK AX = 1900h Return: AL = status 00h not installed FFh installed --------l-2F1901----------------------------- INT 2F U - DOS 4.x only SHELLB.COM - SHELLC.EXE INTERFACE AX = 1901h BL = SHELLC type 00h transient 01h resident DS:DX -> far call entry point for resident SHELLC.EXE Return: ES:DI -> SHELLC.EXE workspace within SHELLB.COM Note: SHELLB.COM and SHELLC.EXE are parts of the DOS 4.x shell --------l-2F1902----------------------------- INT 2F U - DOS 4.x only SHELLB.COM - COMMAND.COM INTERFACE AX = 1902h ES:DI -> ASCIZ full filename of current batch file, with at least the final filename element uppercased DS:DX -> buffer for results Return: AL = 00h failed, either (a) final filename element quoted at ES:DI does not match identity of shell batch file quoted as parameter of most recent call of SHELLB command, or (b) no more Program Start Commands available. AL= FFh success, then: memory at DS:[DX+1] onwards filled as: DX+1: BYTE count of bytes of PSC DX+2: N BYTEs Program Start Command text BYTE 0Dh terminator Desc: COMMAND.COM executes the result of this call in preference to reading a command from a batch file. Thus the batch file does not advance in execution for so long as SHELLB provides PSCs from its workspace. Note: The PSCs are planted in SHELLB workspace by SHELLC, the user menu interface. The final PSC of a sequence is finished with a GOTO COMMON, which causes a loop back in the batch file which called SHELLC so as to execute SHELLC again. The check on batch file name permits PSCs to CALL nested batch files while PSCs are still stacked up for subsequent execution. --------l-2F1903----------------------------- INT 2F U - DOS 4.x only SHELLB.COM - COMMAND.COM interface AX = 1903h ES:DI -> ASCIZ batch file name as for AX=1902h Return: AL = status FFh quoted batch file name matches last SHELLB parameter 00h it does not --------l-2F1904----------------------------- INT 2F U - DOS 4.x only SHELLB.COM - SHELLB transient to TSR intrface AX = 1904h Return: ES:DI -> name of current shell batch file: WORD number of bytes of name following BYTEs (8 max) uppercase name of shell batch file ----------2F1980----------------------------- INT 2F U - IBM ROM-DOS v4.0 - INSTALLATION CHECK AX = 1980h Return: AL = FFh if ??? installed/supported Note: called at the very beginning of SHELLSTB.COM, which exits if AL is not FFh on return SeeAlso: AX=1981h,AX=1982h ----------2F1981----------------------------- INT 2F U - IBM ROM-DOS v4.0 - GET ??? STRING AX = 1981h DS:DX -> buffer for ??? Return: AL = status FFh if successful DS:DX buffer filled (refer to note below) 81h on error Note: the first byte of the buffer is unchanged; depending on a byte in IBMBIO.COM, the remainder of the buffer is filled with either "C:\ROMSHELL.COM",0Dh or xxh,xxh,0Fh,"C:\ROMSHELL.COM",0Dh SeeAlso: AX=1980h,AX=1982h ----------2F1982----------------------------- INT 2F U - IBM ROM-DOS v4.0 - GET ??? TABLE AX = 1982h Return: AL = FFh if supported ES:DI -> ??? table (see #2016) Note: called by ROMSHELL.COM SeeAlso: AX=1980h,AX=1981h Format of ROM-DOS v4.0 ??? table: Offset Size Description (Table 2016) 00h BYTE ??? (00h) 01h BYTE ??? (41h) (ROMSHELL.COM checks if =00h) 02h BYTE ??? (00h) (ROMSHELL.COM checks if =01h) 03h WORD ??? (0001h) (ROMSHELL.COM checks if =0001h) 05h BYTE ??? (00h) 06h WORD ??? (04D5h) --------V-2F1A00----------------------------- INT 2F - DOS 4.0+ ANSI.SYS - INSTALLATION CHECK AX = 1A00h Return: AL = FFh if installed Notes: AVATAR.SYS also responds to this call documented for DOS 5+, but undocumented for DOS 4.x --------V-2F1A00BX414E----------------------- INT 2F - ANSIPLUS.SYS v2.00+ - INSTALLATION CHECK AX = 1A00h BX = 414Eh ('AN') CX = 5349h ('SI') DX = 2B2Bh ('++') Return: AL = FFh if installed CF clear ES:BX -> INT 29 entry point CX = ANSIPLUS BCD version number (v3.10+, CH=major, CL=minor) DL = capabilities (v4.00+) 00h full capability driver 01h reduced capability driver 2Bh full capability driver (before v4.00) Program: ANSIPLUS.SYS is a CON device driver by Kristofer Sweger which replaces the normal ANSI.SYS with a more powerful version having many additional features Notes: ANSIPLUS also identifies itself as ANSI.SYS if BX,CX, or DX differ from the magic values above an additional installation check is to test for the signature "ANSIPLUS" 12 bytes before the INT 29 entry point; the version number is also available as a four-character ASCII string (e.g. "4.00") four bytes before the entry point SeeAlso: AX=1AA5h,AX=1AA6h,AX=1AA7h,AX=1AA8h,AX=1AA9h,AX=1AAAh,AX=D44Fh --------V-2F1A00BX4156----------------------- INT 2F - AVATAR.SYS - INSTALLATION CHECK AX = 1A00h BX = 4156h ('AV') CX = 4154h ('AT') DX = 4152h ('AR') Return: AL = FFh if installed CF clear BX = AVATAR protocol level supported CX = driver type 0000h AVATAR.SYS 4456h DVAVATAR.COM inside DESQview window DX = 0016h Program: AVATAR.SYS is a CON replacement by George Adam Stanislav which interprets AVATAR command codes in the same way that ANSI interprets ANSI command codes Notes: AVATAR also identifies itself as ANSI.SYS if BX, CX, or DX differ from the magic values SeeAlso: AX=1A21h,AX=1A3Ch,AX=1A3Fh,AX=1A52h,AX=1A72h,AX=1A7Dh,AX=1AADh"AVATAR" --------V-2F1A01----------------------------- INT 2F U - DOS 4.0+ ANSI.SYS internal - GET/SET DISPLAY INFORMATION AX = 1A01h CL = function 7Fh for GET 5Fh for SET DS:DX -> parm block as for INT 21,AX=440Ch,CX=037Fh/035Fh respectively Return: CF clear if successful AX destroyed CF set on error AX = error code (many non-standard) Note: presumably this is the DOS IOCTL interface to ANSI.SYS SeeAlso: AX=1A02h,INT 21/AX=440Ch --------V-2F1A02----------------------------- INT 2F U - DOS 4.0+ ANSI.SYS internal - MISCELLANEOUS REQUESTS AX = 1A02h DS:DX -> parameter block (see #2017) Return: CF clear if successful CF set on error AX = error code Note: DOS 5+ chains to previous handler if AL > 02h on call SeeAlso: AX=1A01h Format of ANSI.SYS parameter block: Offset Size Description (Table 2017) 00h BYTE subfunction 00h set/reset interlock 01h get /L flag 01h BYTE interlock state 00h=reset, 01h=set This interlock prevents some of the ANSI.SYS post-processing in its hook onto INT 10, AH=00h mode set 02h BYTE (returned) 00h if /L not in effect 01h if /L in effect --------V-2F1A21----------------------------- INT 2F - AVATAR.SYS - SET DRIVER STATE AX = 1A21h (AL='!') DS:SI -> command string with one or more state characters (see #2018) CX = length of command string Return: CF set on error (invalid subfunction) CF clear if successful Note: the characters in the state string are interpreted left to right, and need not be in any particular order SeeAlso: AX=1A00h/BX=4156h,AX=1A3Fh (Table 2018) Values for AVATAR.SYS state characters: 'a' activate driver 'd' disable driver 'f' use fast screen output 'g' always convert gray keys (+ and -) to function keys 'G' never convert gray keys 'l' convert gray keys only when ScrollLock active 's' use slow screen output 't' Tandy 1000 keyboard (not yet implemented) --------V-2F1A3C----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A3Ch ??? Return: CX = 0000h SeeAlso: AX=1A00h/BX=4156h,AX=1A21h,AX=1A3Eh --------V-2F1A3E----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A3Eh CL = ??? CH = ??? DL = ??? DH = ??? Return: CL = ??? CH = ??? DL = ??? DH = ??? SeeAlso: AX=1A3Ch,AX=1A3Fh --------V-2F1A3F----------------------------- INT 2F - AVATAR.SYS - QUERY DRIVER STATE AX = 1A3Fh (AL='?') ES:DI -> buffer CX = length of buffer in bytes Return: CF clear CX = actual size of returned info Note: the returned information consists of multiple letters whose meanings are described under AX=1A21h SeeAlso: AX=1A00h/BX=4156h,AX=1A21h,AX=1A44h --------S-2F1A42BX4156----------------------- INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ3 HANDLER AX = 1A42h BX = 4156h ('AV') ES:DI -> FAR handler for serial port using IRQ3 DS = data segment needed by handler Return: AX = status/return value 0000h if no more room 1A42h if ASD not installed else handle to use when uninstalling Notes: the handler need not save/restore registers or signal EOI to the interrupt controller the handler should return AX=0000h if the interrupt was meant for it, and either leave AX unchanged or return a non-zero value otherwise the most recently installed handler will be called first, continuing to earlier handlers until one returns AX=0000h SeeAlso: AX=1A43h,AX=1A62h --------S-2F1A43BX4156----------------------- INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ4 HANDLER AX = 1A43h BX = 4156h ('AV') ES:DI -> FAR handler for serial port using IRQ4 DS = data segment needed by handler Return: AX = status/return value 0000h if no more room 1A43h if ASD not installed else handle to use when uninstalling Notes: (see AX=1A42h) SeeAlso: AX=1A42h,AX=1A63h --------V-2F1A44BX4156----------------------- INT 2F - AVATAR.SYS v0.11+ - GET DATA SEGMENT AX = 1A44h BX = 4156h ('AV') Return: AX = 0000h DS = data segment CX = size of data segment Note: AVATAR.SYS calls this function whenever it is invoked. If each process under a multitasker hooks this function and provides a separate data segment, AVATAR.SYS becomes fully reentrant. SeeAlso: AX=1A21h,AX=1A3Fh,AX=1A52h --------V-2F1A52----------------------------- INT 2F U - AVATAR.SYS v0.11 - GET ??? AX = 1A52h CX = size of buffer ES:DI -> buffer Return: ??? copied into user buffer Note: the maximum size of the data which may be copied is returned by AX=1A72h SeeAlso: AX=1A53h,AX=1A72h --------V-2F1A53----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A53h CL = ??? (00h-05h) ??? Return: ??? SeeAlso: AX=1A00h/BX=4156h,AX=1A52h,AX=1A72h --------S-2F1A62BX4156----------------------- INT 2F - AVATAR Serial Dispatcher - UNINSTALL IRQ3 HANDLER AX = 1A62h BX = 4156h ('AV') CX = handle for IRQ routine returned by AX=1A42h SeeAlso: AX=1A42h,AX=1A63h --------S-2F1A63BX4156----------------------- INT 2F - AVATAR Serial Dispatcher - UNINSTALL IRQ4 HANDLER AX = 1A63h BX = 4156h ('AV') CX = handle for IRQ routine returned by AX=1A43h SeeAlso: AX=1A43h,AX=1A62h --------V-2F1A72----------------------------- INT 2F U - AVATAR.SYS v0.11 - GET ??? SIZE AX = 1A72h Return: CX = maximum size of ??? SeeAlso: AX=1A00h/BX=4156h,AX=1A52h,AX=1A7Bh,AX=1AADh"AVATAR" --------V-2F1A7B----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A7Bh Return: AX = 0000h CX = 0000h SeeAlso: AX=1A00h/BX=4156h,AX=1A72h,AX=1A7Dh --------V-2F1A7D----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A7Dh Return: AX = ??? SeeAlso: AX=1A00h/BX=4156h,AX=1A7Bh --------V-2F1AA3----------------------------- INT 2F - ANSIPLUS v4.03+ - GET/SET ANSIPLUS INTERNAL VARIABLES AX = 1AA3h BH = function 00h get current/default colors Return: CH = default colors CL = current colors 01h set current/default colors CH = default colors (00h = leave unchanged) CL = current colors 02h get current subscreen region Return: BH,BL = true screen rows,columns CH,CL = top left row,column of region DH,DL = bottom right row,column of region 03h set subscreen region CH,CL = top left row,column of region DH,DL = bottom right row,column of region 04h get driver features (bits 0-31) Return: DX:CX = current feature bits 05h set driver features (bits 0-31) DX:CX = feature bits 06h get driver features (bits 32-63) Return: DX:CX = current feature bits 07h set driver features (bits 32-63) DX:CX = feature bits other: reserved for future use SeeAlso: AX=1AA4h,AX=1AA5h --------V-2F1AA4----------------------------- INT 2F - ANSIPLUS v4.02+ - GET/SET ANSIPLUS SMOOTH SCROLLING RATE AX = 1AA4h BL = function 00h get scrolling rate 01h set scrolling rate BH = new minimum scrolling rate in scan lines per retrace Return: BH = smooth scrolling rate SeeAlso: AX=1AA3h,AX=1AA5h --------V-2F1AA5----------------------------- INT 2F - ANSIPLUS v4.00+ - GET/SET ANSIPLUS CLIPBOARD AX = 1AA5h DH = subfunction 00h get clipboard information 01h get clipboard text 02h set clipboard text 03h append text to clipboard 04h clear clipboard 05h paste clipboard to keyboard ES:BX -> data area for subfunctions 01h, 02h, and 03h CX = size of data area (maximum size for subfunction 01h, actual size to add to clipboard for subfunctions 02h and 03h) Return: AL = status 00h successful 01h unsupported subfunction (reduced capability driver) 02h insufficient space A5h unsupported function (ANSIPLUS before v4.00) ES:BX -> ANSIPLUS local clipboard data CX = number of bytes currently in local clipboard DX = maximum size of local clipboard SeeAlso: AX=1A00h/BX=414Eh,AX=1AA4h,AX=1AA6h --------V-2F1AA6----------------------------- INT 2F - ANSIPLUS v4.00+ - ENABLE/DISABLE ANSIPLUS DRIVER AX = 1AA6h BH = function 00h get hooked interrupts 01h set hooked interrupts mask BL = new interrupts mask (see #2019) Return: BL = previous interrupts mask (see #2019) SeeAlso: AX=1A00h/BX=414Eh,AX=1AA7h Desc: used to temporarily disable any prior copies of ANSIPLUS when a new copy is installed, such as in a multitasking system like DESQview Note: only the most-recently loaded copy of ANSIPLUS on the current INT 2F chain responds to this call Bitfields for ANSIPLUS hooked interrupts mask: Bit(s) Description (Table 2019) 0 INT 09 hook disabled 1 INT 10 hook disabled 2 INT 15 hook disabled 3 INT 16 hook disabled 4 INT 1C hook disabled 5 reset all bits when INT 29 called 6 INT 29 hook disabled 7 INT 33, INT 74, or other mouse event hook disabled --------V-2F1AA7----------------------------- INT 2F - ANSIPLUS v4.00+ - ENABLE/DISABLE ANSIPLUS FEATURES AX = 1AA7h BL = function 00h prevent scroll-back saves 01h enable scroll-back saves 02h disable key reprogramming and lock changes by escape sequences 03h enable key reprogramming by escape sequences 04h disable and lock key stacking changes by escape sequences 05h allow key stacking by escape sequences Return: nothing SeeAlso: AX=1AA6h --------V-2F1AA8----------------------------- INT 2F - ANSIPLUS v3.10+ - GET NEXT ANSIPLUS SCROLLBACK LINE AX = 1AA8h Return: AL = status 00h successful ES:BX -> screen line (character and attribute pairs) CX = length of line in bytes, 0000h if no more lines or unsupported video mode 01h unsupported video mode active 02h screen currently scrolled back 03h reduced capability driver A8h unsupported function (driver before v3.10) SeeAlso: AX=1A00h/BX=414Eh,AX=1AA9h --------V-2F1AA9----------------------------- INT 2F - ANSIPLUS v3.10+ - GET ANSIPLUS SCROLLBACK INFORMATION AX = 1AA9h Return: AL = status 00h successful BX = current number of lines in scrollback buffer CX = number of bytes in one line 01h unsupported video mode active 02h screen currently scrolled back 03h reduced capability driver A9h unsupported function (driver before v3.10) Desc: determine how much data is in the scrollback buffer and initialize scrollback retrieval to return the first line on the next call to AX=1AA8h SeeAlso: AX=1A00h/BX=414Eh,AX=1AA8h --------V-2F1AAA----------------------------- INT 2F - ANSIPLUS v3.01+ - GET/SET ANSIPLUS SCREEN SAVER BLANKING TIME AX = 1AAAh BX = function FFFFh to get current blanking time other to set time CX = blanking time in clock ticks (0000h-7FFFh) Return: BX = current blanking time CX = blanking time when last set SeeAlso: AX=1A00h/BX=414Eh,AX=1AABh --------V-2F1AAB----------------------------- INT 2F - ANSIPLUS v3.01+ - SET ANSIPLUS KEY REPEAT RATE AX = 1AABh BX = repeat rate in characters per second 0000h use BIOS repeat rate Return: nothing SeeAlso: AX=1A00h/BX=414Eh,AX=1AAAh,AX=1AACh --------V-2F1AAC----------------------------- INT 2F - ANSIPLUS v3.00+ - LOAD CHARACTER GENERATOR AX = 1AACh BH = number of bytes per character pattern BL = VGA/EGA character table to be loaded CX = number of characters to load DX = starting character code (offset into Map2 block) ES:BP -> user character table to be loaded Return: AX = 1100h Desc: load the EGA/VGA character generator without the BIOS function's side effects of resetting the video mode and color palette SeeAlso: AX=1A00h/BX=414Eh,AX=1AABh,AX=1AADh"ANSIPLUS",INT 10/AX=1100h --------V-2F1AAD----------------------------- INT 2F - ANSIPLUS v2.00+ - ANSIPLUS DEVICE STATUS REPORT AX = 1AADh BL = report request code (81h-96h for v4.00) CX = color selector or key code, if required by request Return: AX = first reported result BX = second result CX = third result, if applicable (unchanged otherwise) DX = fourth result, if applicable (unchanged otherwise) Desc: get device status reports equivalent to those for Esc [#n sequences while bypassing any device redirection and avoiding the need to parse the returned result Note: the report request code in BL is identical to the number in the corresponding Esc [#n sequence SeeAlso: AX=1A00h/BX=414Eh,AX=1AACh --------V-2F1AADDX0000----------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1AADh DX = 0000h CX = subfunction (00h-0Ch) ??? Return: AX = 0000h if DX was nonzero ??? SeeAlso: AX=1A00h/BX=4156h,AX=1A72h --------m-2F1B00----------------------------- INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - INSTALLATION CHECK AX = 1B00h Return: AL = FFh if installed Note: XMA2EMS.SYS extension is only installed if DOS has page frames to hide. This extension hooks onto INT 67/AH=58h and returns from that call data which excludes the physical pages being used by DOS. SeeAlso: AH=1Bh"FRAME INFO" --------m-2F1B------------------------------- INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - GET HIDDEN FRAME INFORMATION AH = 1Bh AL <> 00h DI = hidden physical page number Return: AX = FFFFh if failed (no such hidden page) AX = 0000h if OK, then ES = segment of page frame DI = physical page number Notes: this corresponds to the data edited out of the INT 67/AH=58h call FASTOPEN makes this call with AL = FFh SeeAlso: AX=1B00h --------V-2F2300----------------------------- INT 2F - DR DOS 5.0 GRAFTABL - INSTALLATION CHECK AX = 2300h Return: AH = FFh Note: this installation check does not follow the usual format SeeAlso: AH=23h,AX=2E00h --------V-2F23------------------------------- INT 2F - DR DOS 5.0 GRAFTABL - GET GRAPHICS DATA AH = 23h AL nonzero Return: AH = FFh ES:BX -> graphics data (8 bytes for each character from 80h to FFh) SeeAlso: AX=2300h,AX=2E00h --------T-2F2700----------------------------- INT 2F - DR DOS 6.0 TaskMAX - INSTALLATION CHECK AX = 2700h Return: AL = status 00h not installed FFh installed Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in both taskswitching and multitasking modes --------T-2F2701----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET STATUS AX = 2701h Return: AX = maximum simultaneous tasks BX = index into TASK_IDS of current foreground task CX = currently-active tasks DX = version number (DL = major, DH = minor) (DR DOS 6.0 = 0001h, Novell DOS 7 = 0002h) ES:SI -> TASK_IDS ES:DI -> name table (array of 8-byte names, NUL-terminated if <8 chars) Notes: do not attempt to create a new task if CX == AX the task's index is its position on the task menu, while its ID is the position within the internal task name table SeeAlso: AX=2714h,AX=2716h --------T-2F2702----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET PER-TASK EMS LIMIT AX = 2702h Return: DX = maximum pages INT 67/AH=42h will report available Note: TaskMAX does not limit EMS allocations other than by limiting the amount which is reported as being available at a given time SeeAlso: AX=2703h,INT 67/AH=42h --------T-2F2703----------------------------- INT 2F - DR DOS 6.0 TaskMAX - SET PER-TASK EMS LIMIT AX = 2703h DX = maximum pages INT 67/AH=42h should report available Return: DX = new maximum for reporting Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in both taskswitching and multitasking modes SeeAlso: AX=2702h,INT 67/AH=42h --------T-2F2704----------------------------- INT 2F - DR DOS 6.0 TaskMAX - REGISTER/UNREGISTER TASK MANAGER AX = 2704h DL = subfunction 00h unregister task manager 01h register task manager Return: DL = status 00h registered 01h unregistered Notes: a task manager replaces TaskMAX's menu system with its own user interface; while one is registered, the TaskMAX hotkeys and Ctrl-Alt-Del invoke the manager rather than the built-in menu system unregister the task manager before terminating it SeeAlso: AX=2705h Index: hotkeys;TaskMAX --------T-2F2705----------------------------- INT 2F - DR DOS 6.0 TaskMAX - ENABLE/DISABLE DIRECT SWITCHING AX = 2705h DL = subfunction 00h disable keystrokes for switching to next/prev/specified task 01h enable Return: nothing Note: should only be called by a registered task manager (see AX=2704h) SeeAlso: AX=2704h,AX=2706h --------T-2F2706----------------------------- INT 2F - DR DOS 6.0 TaskMAX - SWITCH TO SPECIFIED TASK AX = 2706h DX = task index (see AX=2701h) of task to be activated Return: DX = task index of previously-active task Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in both taskswitching and multitasking modes SeeAlso: AX=2705h,AX=2707h,AX=2715h --------T-2F2707----------------------------- INT 2F - DR DOS 6.0 TaskMAX - CREATE NEW TASK AX = 2707h DS:DX -> ASCIZ pathname of executable ES:BX -> parameter block (see #2020) CX = number of ticks before automatic return to task manager (0000h = run until termination or explicitly switched) Return: DX = new task's task index (FFFFh if task terminated) SeeAlso: AX=2706h,AX=2708h Format of TaskMAX parameter block: Offset Size Description (Table 2020) 00h WORD reserved, should be 0000h 02h DWORD pointer to command tail to be copied into child's PSP 06h DWORD pointer to first FCB to be copied into child's PSP 0Ah DWORD pointer to second FCB to be copied into child's PSP --------T-2F2708----------------------------- INT 2F - DR DOS 6.0 TaskMAX - DELETE TASK AX = 2708h DX = task index Return: DX = FFFFh (task deleted) Notes: this call should only be used for abnormal task termination, after first checking for open files with AX=270Ch; should not be used with programs that allocate EMS or XMS memory switches to specified task first SeeAlso: AX=2707h --------T-2F2709----------------------------- INT 2F - DR DOS 6.0 TaskMAX - NAME TASK AX = 2709h DX = task index DS:SI -> 8-byte name (8 NULs = remove name) Return: AL = task flags 00h ID unused or task terminated 01h ID in use, task name table entry valid 81h ID in use, task name fixed BX = task ID ES:DI -> name in task name table (see AX=2701h) Note: the task retains the given name until it terminates or the name is removed by specifying a name of 8 NULs. SeeAlso: AX=2701h,AX=2707h --------T-2F270A----------------------------- INT 2F - DR DOS 6.0 TaskMAX - CONVERT TASK INDEX TO TASK ID AX = 270Ah DX = task index Return: DX = task ID (FFFFh if index invalid) Note: task IDs stay constant, while indexes can change when other tasks are deleted SeeAlso: AX=2701h,AX=270Bh --------T-2F270B----------------------------- INT 2F - DR DOS 6.0 TaskMAX - CONVERT TASK ID TO TASK INDEX AX = 270Bh DX = task ID Return: DX = task index (FFFFh if task not active) Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in both taskswitching and multitasking modes SeeAlso: AX=270Ah --------T-2F270C----------------------------- INT 2F - DR DOS 6.0 TaskMAX - CHECK OPEN FILES AX = 270Ch DX = task index Return: AX = number of files currently open for specified task SeeAlso: AX=2708h --------T-2F270D----------------------------- INT 2F - DR DOS 6.0 TaskMAX - CHECK IF TASK RUNNING PRIMARY COMMAND INTERPRETER AX = 270Dh DX = task index Return: DX = status 0000h if primary command interpreter (COMMAND.COM, etc.) running 0001h if not in root shell for task Note: TaskMAX will return 0001h if the specified task has spawned another command interpreter with AX=2707h SeeAlso: AX=2707h,AX=270Ch --------T-2F270E----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET/SET TEXT PASTE LEAD-IN AX = 270Eh CX = length of string (max 15 keystrokes, 0000h to get current string) DS:SI -> pasting lead-in string (character/scan-code pairs) Return: ES:DI -> current lead-in string Note: the specified sequence of keystrokes is sent to the application before every line of a text-mode spreadsheet paste SeeAlso: AX=270Fh,AX=2710h,AX=2713h --------T-2F270F----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET/SET NUMERIC PASTE LEAD-IN AX = 270Fh CX = length of string (max 15 keystrokes, 0000h to get current string) DS:SI -> pasting lead-in string (character/scan-code pairs) Return: ES:DI -> current lead-in string Note: the specified sequence of keystrokes is sent to the application before every number in a numeric-mode spreadsheet paste SeeAlso: AX=270Eh,AX=2710h,AX=2711h,AX=2713h --------T-2F2710----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET/SET PASTE LINE TERMINATOR STRING AX = 2710h CX = length of string (max 15 keystrokes, 0000h to get current string) DS:SI -> pasting terminator string (character/scan-code pairs) Return: ES:DI -> current terminator string Note: the specified sequence of keystrokes is sent to the application after every line of a spreadsheet paste operation SeeAlso: AX=270Eh,AX=270Fh,AX=2713h --------T-2F2711----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET/SET NUMERIC PASTE DECIMAL POINT AX = 2711h DX = ASCII code for separator (FFFFh to get current) Return: DL = current separator character SeeAlso: AX=270Fh --------T-2F2712----------------------------- INT 2F - DR DOS 6.0 TaskMAX - INITIATE EXPORTING TASK DATA AX = 2712h DX = task index --------T-2F2713----------------------------- INT 2F - DR DOS 6.0 TaskMAX - INITIATE PASTE OPERATION AX = 2713h DX = task index CX = paste mode 0000h alphanumeric 0001h numeric 0002h text SeeAlso: AX=270Eh,AX=270Fh,AX=2710h,AX=2711h --------T-2F2714----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET SWAP SPACE INFO AX = 2714h Return: CX = total KB of swap space DX = available KB of swap space Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in both taskswitching and multitasking modes SeeAlso: AX=2701h --------T-2F2715----------------------------- INT 2F - DR DOS 6.0 TaskMAX - SWITCH TO TASK MANAGER AX = 2715h Return: only after calling task is again selected SeeAlso: AX=2706h --------T-2F2716----------------------------- INT 2F - DR DOS 6.0 TaskMAX - GET PASTE BUFFER STATUS AX = 2716h Return: AX = 0000h if AX=2716h,AX=2717h,AX=2718h supported CX = bytes in paste buffer DX = current generation number (updated after every copy operation) BUG: Novell DOS 7 TASKMGR returns AX=0000h even though it does not support this call (it does support the remainder of the TaskMAX API) SeeAlso: AX=2701h,AX=2713h,AX=2714h,AX=2717h,AX=2718h --------T-2F2717----------------------------- INT 2F - DR DOS 6.0 TaskMAX - PASTE DATA DIRECTLY TO APPLICATION BUFFER AX = 2717h CX = bytes in destination buffer ES:DI -> destination buffer Return: AX = 0000h if function supported CX = bytes actually copied (FFFFh if buffer too small) DX = current generation number for paste buffer BUG: Novell DOS 7 TASKMGR returns AX=0000h even though it does not support this call (it does support the remainder of the TaskMAX API) Note: the destination buffer may be too small if another task adds more data to the paste buffer after the AX=2716h call but before this call SeeAlso: AX=2713h,AX=2716h,AX=2718h --------T-2F2718----------------------------- INT 2F - DR DOS 6.0 TaskMAX - COPY DATA DIRECTLY INTO PASTE BUFFER AX = 2718h CX = bytes in source buffer DS:SI -> source buffer (plain ASCII, lines terminated with CR LF) Return: AX = 0000h if function supported CX = bytes actually copied DX = current generation number for paste buffer BUG: Novell DOS 7 TASKMGR returns AX=0000h even though it does not support this call (it does support the remainder of the TaskMAX API) SeeAlso: AX=2712h,AX=2716h,AX=2717h --------T-2F2719----------------------------- INT 2F - Novell DOS 7 TaskMGR - NOP AX = 2719h to 271Bh --------T-2F271C----------------------------- INT 2F U - Novell DOS 7 TaskMGR - ??? AX = 271Ch DX = ??? bit 0: ??? Return: ??? ---if DX bit 0 set--- AX = 0031h CX = 0000h BUG: if the task switcher is running, and DX bit 0 is set on call, this function will crash because its exit code attempts to pop several registers which are not pushed when DX bit 0 is set --------m-2F2780CL01------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = 01h (function number) CH = subfunction 00h unused Return: CX = status (0002h) (see #2021) 01h unused Return: CX = status (0002h) (see #2021) 02h ??? BX = ??? (0005h-000Fh) Return: CX = status (0000h,0030h) (see #2021) 03h allocate ??? DX = ??? Return: CX = status (0000h,0003h) (see #2021) 04h get ??? Return: CX = 0000h (successful) BX = selector for EMM386 data segment EBX high word cleared 05h ??? EDX = ??? Return: ??? 06h return to real mode via triple fault 07h debugger break Note: calls INT 03, then INT 21/AH=02h to output a question mark 08h get ??? Return: CX = 0000h (successful) EBX = ??? (0 or 2) 09h ??? 0Ah ??? 0Bh unused Return: CX = status (0002h) (see #2021) 0Ch ??? manipulates DOS memory chain 0Dh ??? EBX = ??? EDX = ??? Return: ??? 0Eh ??? Return: CX = 0000h (successful) BL = ??? \ or BX = 0000h BH = ??? / 0Fh get ??? Return: CX = 0000h (successful) EBX = ??? 10h get and set ??? EDX = ??? Return: CX = 0000h (successful) EBX = old value of ??? 11h get ??? Return: CX = 0000h (successful) EBX = ??? (0100h) 12h get and set ??? DX = ??? Return: CX = 0000h (successful) AX = old value of ??? 13h ??? Return: CX = status (0000h,003Fh) (see #2021) AX = ??? 14h ??? EDX = ??? Return: CX = status (0000h,003Fh) (see #2021) 15h ??? BX = segment of ??? Return: CX = 0000h (successful) BX = segment of ??? 16h ??? 17h ??? EBX = subfunction (0-2) Return: CX = status (0002h if EBX>2) (see #2021) ??? 18h unused Return: CX = status (0002h) (see #2021) Return: CX = status (most subfunctions) (E)AX and/or (E)BX contain return values, depending on function Notes: called by DPMS.EXE and EMM386.EXE this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=02h,AX=2780h/CL=03h,AX=2780h/CL=04h (Table 2021) Values for Novell DOS 7 EMM386 function status: 0000h successful 0001h invalid function??? 0002h invalid subfunction 0003h ??? 0004h invalid ??? index 0005h ??? 0006h ??? 0007h ??? 0009h ??? 000Ah ??? 000Bh invalid ??? handle 000Ch ??? 000Dh ??? 000Eh ??? 000Fh ??? 0014h ??? 0023h ??? 0030h ??? 003Fh ??? --------m-2F2780CL02------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = 02h (function number) CH = subfunction 00h ??? ??? Return: CX = status (0000h,0023h, others???) (see #2021) BX = ??? (0000h if CX=0000h, FFFFh if CX=0023h) Note: calls func 04h/sf 03h, func 04h/sf 1Eh,func 02h/sf 43h, func 02h/sf 0Bh, and func 04h/sf 01h 01h get and clear ??? DX = ??? handle or 0000h for default Return: CX = status (0000h,000Bh) (see #2021) EBX = old value of ??? if successful EDX destroyed 02h ??? DX = index of ??? Return: CX = status (0000h,0004h,0005h) (see #2021) EBX = 0000FFFFh on error, 00000000h if successful 03h ??? DX = index of ??? Return: CX = status (0000h,0004h,0006h) (see #2021) BX = FFFFh on error, 0000h if successful 04h ??? Return: CX = status (0000h,0007h,000Ah) (see #2021) 05h ??? EDX -> ??? data (first 8 bytes seem to be name) Return: CX = status (0000h,0009h,000Dh) (see #2021) 06h ??? Note: calls fn 02h/subfn 05h, then fn 02h/subfn 40h 07h ??? EDX = ??? Return: CX = status (0000h,0009h,000Eh) (see #2021) 08h ??? EDX = ??? Return: CX = status (0000h,0009h,000Eh) (see #2021) 09h ??? EDX = ??? Return: CX = status (0000h,0009h,000Fh) (see #2021) 0Ah ??? EDX = ??? Return: CX = status (0000h,0009h,000Fh) (see #2021) 0Bh ??? DX = ??? Return: CX = 0000h (successful) 0Ch ??? Return: CX = 0000h (successful) 0Dh ??? Return: CX = status (0000h,0023h) (see #2021) BX = FFFFh on error, 0000h if successful Note: calls fn 04h/subfn 03h, fn 04h/subfn 1Eh, fn 02h/subfn 43h, fn 02h/subfn 0Bh, fn 04h/sub 01h 0Eh ??? ??? Return: CX = status (0000h,000Ch) (see #2021) EBX = ??? if successful 0Fh ??? BX = ??? DX = ??? handle or 0000h for default Return: CX = status (0000h,000Bh) (see #2021) 10h get ??? handle Return: CX = 0000h (successful) BX = handle of default ??? EBX high word cleared 11h ??? DX = ??? handle or 0000h for default BX = ??? (handle???) Return: CX = status (0000h,000Bh,0014h) (see #2021) 12h ??? BX = ??? DX = ??? Return: CX = 0000h (successful) 13h ??? DX = ??? Return: CX = status (see #2021) 14h ??? BX = ??? DX = ??? Return: CX = status (0000h,0014h) (see #2021) BX = FFFFh on error, ??? if successful 15h set ??? flags BX = ??? (low two bits only) DX = ??? handle or 0000h for default Return: CX = status (0000h,000Bh) (see #2021) BX = new value of ??? flags (entire word) EBX high register cleared 16h clear ??? flag for default ??? Return: CX = 0000h (successful) 17h ??? 18h ??? 19h ??? 1Ah ??? 1Bh ??? 1Ch ??? 1Dh ??? 1Eh ??? 1Fh ??? 20h ??? 21h ??? 22h ??? 23h ??? 24h ??? 25h ??? 26h ??? 27h ??? 28h ??? 29h ??? 2Ah ??? 2Bh ??? 2Ch ??? 2Dh ??? 2Eh ??? 2Fh ??? 30h ??? 31h ??? 32h ??? 33h ??? 34h ??? 35h ??? 36h ??? 37h ??? 38h ??? 39h ??? 3Ah ??? 3Bh ??? 3Ch ??? 3Eh ??? 3Fh ??? 40h ??? 41h ??? 42h ??? 43h ??? 44h ??? 45h ??? 46h ??? 47h ??? Return: CX = status (most subfunctions) (E)AX and/or (E)BX contain return values, depending on function Notes: called by DPMS.EXE and EMM386.EXE this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=03h,AX=2780h/CL=04h --------m-2F2780CL03------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = 03h (function number) CH = subfunction 00h ??? 01h ??? 02h ??? 03h ??? 04h ??? 05h ??? 06h ??? 07h ??? 08h ??? 09h ??? 0Ah ??? 0Bh ??? 0Ch ??? 0Dh ??? 0Eh ??? 0Fh ??? 10h ??? 11h ??? 12h ??? 13h ??? 14h ??? 15h ??? 16h ??? 17h ??? 18h ??? 19h ??? 1Ah ??? 1Bh ??? 1Ch ??? 1Dh ??? 1Eh ??? 1Fh ??? 20h ??? 21h ??? 22h ??? 23h ??? 24h ??? 25h ??? 26h ??? 27h ??? 28h ??? 29h ??? 2Ah ??? 2Bh ??? 2Ch ??? 2Dh ??? 2Eh ??? 2Fh ??? 30h ??? 31h ??? 32h ??? 33h ??? 34h ??? 35h ??? 36h ??? 37h ??? Return: CX = status (most subfunctions) (E)AX and/or (E)BX contain return values, depending on function Notes: called by DPMS.EXE and EMM386.EXE this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=04h --------m-2F2780CL04------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = 04h (function number) CH = subfunction 00h ??? 01h ??? 02h ??? 03h ??? 04h ??? 05h ??? 06h ??? 07h ??? 08h ??? 09h ??? 0Ah ??? 0Bh ??? 0Ch ??? 0Dh ??? 0Eh ??? 0Fh ??? 10h ??? 11h ??? 12h ??? 13h ??? 14h ??? 15h ??? 16h ??? 17h ??? 18h ??? 19h ??? 1Ah ??? 1Bh ??? 1Ch ??? 1Dh ??? 1Eh ??? 1Fh ??? 20h ??? 21h ??? 22h ??? 23h ??? 24h ??? 25h ??? 26h ??? 27h ??? 28h ??? 29h ??? 2Ah ??? 2Bh ??? 2Ch ??? 2Dh ??? 2Eh ??? 2Fh ??? 30h ??? 31h ??? 32h ??? Return: CX = status (most subfunctions) (E)AX and/or (E)BX contain return values, depending on function Notes: called by DPMS.EXE and EMM386.EXE this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h --------m-2F2780CL05------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = 05h ??? Return: ??? Notes: called by DPMS.EXE and EMM386.EXE the handler for this function may be set by one of the subfunctions of AX=2780h/CL=01h; the default handler returns AX=BX=FFFFh and CX=0001h (see #2021) this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h --------m-2F2780CL06------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = 06h ??? Return: ??? Notes: called by DPMS.EXE and EMM386.EXE the handler for this function may be set by one of the subfunctions of AX=2780h/CL=01h; the default handler returns AX=BX=FFFFh and CX=0001h (see #2021) this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h --------m-2F2780----------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API AX = 2780h CL = function (07h-0Fh) ??? Return: ??? Notes: called by DPMS.EXE and EMM386.EXE the handlers for each of these functions may be set individually by one of the subfunctions of AX=2780h/CL=01h; the default handlers return with all registers unchanged this API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table SeeAlso: AX=12FFh/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h --------T-2F2781----------------------------- INT 2F U - Novell DOS 7 TaskMGR - BEGIN CRITICAL SECTION??? AX = 2781h Return: ??? SeeAlso: AX=2782h --------T-2F2782----------------------------- INT 2F U - Novell DOS 7 TaskMGR - END CRITICAL SECTION??? AX = 2782h Return: ??? SeeAlso: AX=2781h --------m-2F2783----------------------------- INT 2F U - Novell DOS 7 - EMM386.EXE - GET ??? AX = 2783h Return: AX = ??? BX = ??? --------T-2F278F----------------------------- INT 2F U - Novell DOS 7 TaskMGR - ??? API AX = 278Fh as for INT 2F/AX=2780h Return: as for INT 2F/AX=2780h Note: Novell DOS 7 TaskMGR passes this call through to INT 2F/AX=2780h without changing any other registers SeeAlso: AX=2780h,AX=2782h --------F-2F2A------------------------------- INT 2F - Gammafax DOS Dispatcher INTERFACE AH = 2Ah Note: details not available at this time SeeAlso: AX=8000h"FaxBIOS",AX=C000h/BX=444Bh,AX=CB00h,AX=CBDDh,INT 66"BitFax" --------V-2F2E00----------------------------- INT 2F U - Novell DOS 7 - GRAFTABL - INSTALLATION CHECK AX = 2E00h Return: AH = FFh if installed Note: this installation check does not follow the usual format of setting AL to FFh SeeAlso: AX=2300h,AH=2Eh"GRAFTABL" --------V-2F2E------------------------------- INT 2F U - Novell DOS 7 - GRAFTABL - GET FONT TABLE AH = 2Eh AL nonzero Return: AH = FFh if installed ES:BX -> graphics data (8 bytes per character from 80h to FFh) SeeAlso: AX=2E00h,AH=23h"GRAFTABL" --------t-2F3900----------------------------- INT 2F - Kingswood TSR INTERFACE - COMPATIBILITY MODE AX = 3900h Return: AL = status 00h not installed FFh one or more TSRs using this interface is installed DX may be destroyed Note: this function is provided to that the multiplex number will appear used to other programs SeeAlso: AH=39h/BL=00h --------t-2F39--BL00------------------------- INT 2F - Kingswood TSR INTERFACE - INSTALLATION CHECK AH = 39h BL = 00h AL = TSR ID number (01h-FFh, currently only 01h-1Bh used) (see #2022) Return: AL = status 00h not installed FFh installed DX = segment address of resident module Note: All of Kingswood Software's TSRs use this interface. Usually the resident module is installed by allocating a block of upper memory, setting its owner ID to 000Ah (used by DOS), and filling the MCB name field with the TSR's name. SeeAlso: #2023,AX=3900h,AH=39h/BL=01h (Table 2022) Values for Kingswood TSR ID number: 01h TSR Windows 02h NOBUSY 03h CD STACK 04h DISK WATCH 05h PUSHBP 06h ALIAS 07h KEYMACRO 08h SLOWDOWN 09h ANSIGRAB 0Ah TEE 0Bh FASTMOUS 0Ch EXTWILD 0Dh BREAKOUT 0Eh STOPDISK 0Fh MEMINIT 10h JANUSEXT 11h CAPS 12h ANSI 13h TRAPPER 14h EATMEM 15h WPJOKE 16h SHOWDOS 17h LOGINTS 18h BLANKVGA 19h SWAPEXEC 1Ah SHELL 1Bh TSRGAMES Format of Kingswood TSR modules: Offset Size Description (Table 2023) 00h 4 BYTEs signature "FTSR" 04h WORD segment address of this module (used to check validity) 06h WORD number of words to skip (usually 0000h if no PSP present) 08h N WORDs module-defined data that must be at a fixed segment offset (usually only a PSP if file access is required) 5N BYTEs interrupt list (see #2024) BYTE FFh terminator Format of Kingswood TSR interrupt list entry: Offset Size Description (Table 2024) 00h BYTE interrupt number (00h-FEh) 01h WORD offset within segment of DWORD pointer to previous interrupt 03h WORD offset within segment of begin of interrupt handler code --------t-2F39--BL01------------------------- INT 2F - Kingswood TSR INTERFACE - REMOVAL CHECK AH = 39h BL = 01h AL = TSR ID number (01h-FFh) (see #2022) Return: AL = status 00h not ready to be removed FFh resident module may be removed by deassigning the interrupts hooked by the TSR and deallocating the TSR's memory block AH,BX,CX,DX,ES may be destroyed SeeAlso: AX=3900h,AH=39h/BL=00h --------t-2F39------------------------------- INT 2F - Kingswood TSR INTERFACE - APPLICATION-SPECIFIC FUNCTION CALLS AH = 39h BL = function number (02h-FFh) AL = TSR ID number (01h-FFh) (see #2022) CX,DX,SI,DI,DS,ES may contain parameters BH reserved for use by the function dispatcher Return: as appropriate for the called function SeeAlso: AX=3900h,AH=39h/BL=00h,AX=3901h/BL=02h --------r-2F3901BL02------------------------- INT 2F - Kingswood TSR Windows - OPEN WINDOW AX = 3901h BL = 02h Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Notes: opens the next TSR window on top of any others. Only three TSR windows can be opened at any one time. The three windows are all 40x11 characters, partly overlapping. SeeAlso: AH=39h/BL=00h,AX=3901h/BL=03h,AX=3901h/BL=05h,AX=3901h/BL=06h --------r-2F3901BL03------------------------- INT 2F - Kingswood TSR Windows - HIDE WINDOWS AX = 3901h BL = 03h Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Notes: Hide any visible TSR windows from view. SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h,AX=3901h/BL=05h --------r-2F3901BL04------------------------- INT 2F - Kingswood TSR Windows - SHOW WINDOWS AX = 3901h BL = 04h Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Notes: Re-display all TSR windows after a HIDE WINDOWS call. SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h,AX=3901h/BL=03h --------r-2F3901BL05------------------------- INT 2F - Kingswood TSR Windows - CLOSE WINDOW AX = 3901h BL = 05h Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Notes: Close the last opened TSR window. SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h --------r-2F3901BL06------------------------- INT 2F - Kingswood TSR Windows - SET WINDOW TITLE AX = 3901h BL = 06h DS:SI -> title string Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h --------r-2F3901BL07------------------------- INT 2F - Kingswood TSR Windows - POSITION CURSOR AX = 3901h BL = 07h CH = Y coordinate (0-10) CL = X coordinate (0-39) Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Note: the hardware cursor is always disabled when a TSR window is opened; this call only sets a text position SeeAlso: AH=39h/BL=00h,AX=3901h/BL=08h,AX=3901h/BL=09h --------r-2F3901BL08------------------------- INT 2F - Kingswood TSR Windows - DISPLAY STRING AX = 3901h BL = 08h DS:SI -> string Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Notes: The text is not clipped. This routine understands Tab, NewLine and Carriage Return SeeAlso: AH=39h/BL=00h,AX=3901h/BL=07h --------r-2F3901BL09------------------------- INT 2F - Kingswood TSR Windows - SCROLL WINDOW AX = 3901h BL = 09h CL = scroll direction: 01h up, FFh down, 00h clear window Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved SeeAlso: AH=39h/BL=00h,AX=3901h/BL=07h --------r-2F3901BL0A------------------------- INT 2F - Kingswood TSR Windows - SOUND BEEPER AX = 3901h BL = 0Ah DX = sound divisor, or 0 for silence. (divide 1843200 by required frequency to get value for DX) CL = sound length in 18.2 Hz clock ticks Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved SeeAlso: AH=39h/BL=00h --------r-2F3901BL0B------------------------- INT 2F - Kingswood TSR Windows - ADD OR REMOVE USER AX = 3901h BL = 0Bh CL = number of users increment: +1 if adding a new user -1 if removing a user Return: AX = error code (0000h if successful) SI,DI,DS,ES preserved Note: the TSR windows resident module may only be removed when the internal user count is zero SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h --------V-2F3912BL03------------------------- INT 2F - Kingswood ANSI display driver - SET COMPATIBILITY MODE AX = 3912h BL = 03h CL = new mode (00h fast, FFh BIOS) Return: AL = old compatibility mode SI,DI,DS,ES preserved SeeAlso: AX=3900h,AX=3912h/BL=04h --------V-2F3912BL04------------------------- INT 2F - Kingswood ANSI display driver - SET FLAGS AX = 3912h BL = 04h CL = new flags (see #2025) Return: AL = old flags SI,DI,DS,ES preserved SeeAlso: AX=3900h,AX=3912h/BL=03h Bitfields for Kingswood ANSI flags: Bit(s) Description (Table 2025) 0 do not wrap at end of line 1 wait for beeps to end before displaying next character 2 do not use graphics cursor --------W-2F4000----------------------------- INT 2F - Windows 3.x (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABLTIES AX = 4000h Return: AL = video virtualization (see #2026) Note: this function is used by display drivers to find out what capabilities exist for the VDD driver and also trigger the VDD driver to call functions 4005h and 4006h. This function also gives the Video Driver hardware access to the video registers. (Table 2026) Values for Windows video virtualization: 01h does not virtualize video access 02h virtualizes the video when in text mode 03h virtualizes the video when in text mode or single plane graphics modes 04h virtualizes the video when in text mode, single plane graphics modes, and VGA multiplane modes FFh virtualizes the video fully --------O-2F4001----------------------------- INT 2F C - OS/2 compatibility box - SWITCHING DOS TO BACKGROUND AX = 4001h Note: called by OS/2 when the DOS box is about to be placed in the background and the video driver should save any necessary state SeeAlso: AX=4002h,AX=4005h --------O-2F4002----------------------------- INT 2F C - OS/2 compatibility box - SWITCHING DOS TO FOREGROUND AX = 4002h Note: called by OS/2 when the DOS box is about to be placed in the foreground and the video driver should restore the previously-saved state SeeAlso: AX=4001h,AX=4006h --------W-2F4003----------------------------- INT 2F - Windows 3.x - ENTERING VIDEO DRIVER CRITICAL SECTION AX = 4003h Note: This critical section must be exited within 1 second. SeeAlso: AX=4004h --------W-2F4004----------------------------- INT 2F - Windows 3.x - EXITING VIDEO DRIVER CRITICAL SECTION AX = 4004h SeeAlso: AX=4003h --------W-2F4005----------------------------- INT 2F C - Windows 3.x - SWITCHING DOS TO BACKGROUND AX = 4005h Note: called by Windows when the DOS box is about to be placed in the background and the video driver should save any necessary state information (this may be called only in Standard mode) SeeAlso: AX=4001h,AX=4006h --------W-2F4006----------------------------- INT 2F C - Windows 3.x - SWITCHING DOS TO FOREGROUND AX = 4006h Note: called by Windows when the DOS box is about to be placed in the foreground and the video driver should restore any necessary state information (this may be called only in Standard mode) SeeAlso: AX=4002h,AX=4005h --------W-2F4007----------------------------- INT 2F - Windows 3.x - ENABLE VDD TRAPPING OF VIDEO REGISTERS AX = 4007h Note: used by Windows Standard mode --------O-2F4010----------------------------- INT 2F - OS/2 v2.0+ - INSTALLATION CHECK / GET VERSION AX = 4010h Return: AX = 4010h if OS/2 not installed AX = 0000h for OS/2 Warp 3.0 BX = OS/2 version if installed Note: OS/2 Warp 3.0 SeeAlso: INT 21/AH=30h,INT 21/AX=3306h --------O-2F4011----------------------------- INT 2F - OS/2 - GET VDD API ENTRY POINT AX = 4011h DS:(E)SI -> ASCIZ name of VDD registered with VDHRegisterAPI Return: ES:DI -> breakpoint address to call for VDD API, or 0000h:0000h Note: this function may be invoked from either V86 or protected mode, and will return the appropriate address to call for invoking the VDD in that mode SeeAlso: AX=1684h --------E-2F4040----------------------------- INT 2F - PharLap 286|DOS-Extender Lite v2.5 - ??? AX = 4040h Return: BX:CX -> ??? --------!---Section--------------------------