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Text File | 1993-12-05 | 320KB | 8,376 lines

Interrupt List, part 6 of 10 This compilation is Copyright (c) 1989,1990,1991,1992,1993 Ralf Brown --------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 or RETF 2 with CF set DOS will abort program with errorlevel 0 else (RETF/RETF 2 with CF clear or IRET) 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) 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 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 - DOS 1+ - CRITICAL ERROR HANDLER Note: invoked when a critical (usually hardware) error is encountered; should never be called directly SeeAlso: INT 21/AH=95h Critical error handler is invoked with: AH = type and processing flags bit 7 clear = disk I/O error set = -- if block device, bad FAT image in memory -- if char device, error code in DI bit 6 unused bit 5 = 1 if Ignore allowed, 0 if not (DOS 3+) bit 4 = 1 if Retry allowed, 0 if not (DOS 3+) bit 3 = 1 if Fail allowed, 0 if not (DOS 3+) bit 2 \ disk area of error 00 = DOS area 01 = FAT bit 1 / 10 = root dir 11 = data area bit 0 = 1 if write, 0 if read AL = drive number if AH bit 7 clear BP:SI -> device driver header (BP:[SI+4] bit 15 set if char device) DI low byte contains error code if AH bit 7 set 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+) sharing violation 0Eh (DOS 3+) lock violation 0Fh invalid disk change 10h (DOS 3+) FCB unavailable 11h (DOS 3+) sharing buffer overflow 12h (DOS 4+) code page mismatch 13h (DOS 4+) out of input 14h (DOS 4+) insufficient disk space 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 Handler must return: AL = action code 00h ignore error and continue processing request 01h retry operation 02h terminate program through the equivalent of INT 21/AH=4Ch (INT 20h for DOS 1.x) 03h fail system call in progress 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+) if a critical error occurs inside the critical error handler, the DOS call is automatically failed --------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 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 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 AL = error code (same as passed to INT 24 in DI) AX = 0207h if more than 64K sectors on drive 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 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 --------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 below) Return: same as above Notes: partition is potentially >32M (and requires this form of the call) if bit 1 of device attribute word in 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 Format of disk read packet: Offset Size Description 00h DWORD sector number 04h WORD number of sectors to read 06h DWORD transfer address --------d-25CDCD----------------------------- INT 25 - Stacker - GET DEVICE DRIVER ADDRESS AX = CDCDh DS:BX -> buffer for address (see below) CX = 0001h DX = 0000h Return: AX = CDCDh if Stacker installed DS:BX buffer filled Format of driver address buffer: Offset Size Description 00h WORD signature CDCDh 02h WORD ??? 0001h 04h DWORD pointer to start of Stacker device driver Format of device driver: Offset Size Description 00h WORD signature A55Ah 02h WORD Stacker version * 64h 04h WORD offset of volume-specific information offset table (list of WORDs, one per drive, containing offsets to various information) 06h 56 BYTEs n/a 3Eh BYTE volume number, set after INT 21/AX=4404h (use to index into volume-specific info offset table) 3Fh 19 BYTEs n/a 52h 4 BYTEs ASCII string "SWAP" 56h 26 BYTEs drive mapping table (one byte for each drive A: through Z:) Format of Stacker boot record: Offset Size Description 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 ??? --------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 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 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 AL = error code (same as passed to INT 24 in DI) AX = 0207h if more than 64K sectors on drive 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 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 --------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 below) Return: same as above Notes: partition is potentially >32M (and requires this form of the call) if bit 1 of device attribute word in 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 Format of disk write packet: Offset Size Description 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+; 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 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 --------N-2A00------------------------------- INT 2A - NETWORK (Microsoft, LANtastic) - INSTALLATION CHECK AH = 00h Return: AH <> 00h if installed CF set if NetWare v2.15 NetBIOS emulator installed Note: also supported by Lantastic, NetWare, 10NET, etc. SeeAlso: INT 5C --------N-2A0000----------------------------- INT 2A - AT&T Starlan Extended NetBIOS (var length names) - INSTALLATION CHECK AX = 0000h Return: AH = DDh SeeAlso: INT 5B --------N-2A01------------------------------- INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NETBIOS REQUEST,NO ERROR RETRY AH = 01h ES:BX -> NCB (see INT 5C) Return: AL = NetBIOS error code AH = 00h if no error = 01h on error SeeAlso: AH=04h,AX=0500h,INT 5B,INT 5C"NetBIOS" --------N-2A02------------------------------- INT 2A - NETWORK (Microsoft) - SET NET PRINTER MODE AH = 02h ??? Return: ??? --------N-2A0300----------------------------- INT 2A - NETWORK (Microsoft,LANtastic) - 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) may take some time to execute this function is called by the DOS kernel on INT 25 and INT 26 also supported by Lantastic, NetWare, 10NET, etc. SeeAlso: INT 13,INT 25,INT 26,INT 21/AX=5F02h --------N-2A04------------------------------- INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NetBIOS REQUEST AH = 04h AL = error retry 00h automatically retry request on errors 09h, 12h, and 21h 01h no retry 02h ??? ES:BX -> Network Control Block (see 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 also supported by Lantastic, NetWare, 10NET, etc. NetWare 2.15 NetBIOS emulator returns CF clear if successful, CF set on error SeeAlso: AH=01h,AX=0500h,INT 5B,INT 5C"NetBIOS" --------N-2A0500----------------------------- INT 2A - NETWORK (Microsoft,LANtastic) - 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 Note: also supported by Lantastic, NetWare, 10NET, etc. SeeAlso: AH=01h,AH=04h,INT 5C"NetBIOS" --------N-2A06------------------------------- INT 2A - NETBIOS, LANtastic - NETWORK PRINT-STREAM CONTROL AH = 06h AL = 01h set concatenation mode (all printer output put in one job) 02h set truncation mode (default) printer open/close starts new print 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-* also supported by LANtastic, NetWare, 10NET, etc. LANtastic v4.x no longer supports this call 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-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) 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 0Fh IBM PC LAN server (while intercepting INT 10/AH=06h,07h,0Eh) 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 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+ to enable use of critical sections. For DOS 4+, all words in this list point at the byte at offset 0D0Ch. SeeAlso: AH=81h,AH=82h,AX=8700h,INT 21/AX=5D06h,INT 21/AX=5D0Bh --------D-2A81------------------------------- INT 2A CU - NETWORK - END DOS CRITICAL SECTION AH = 81h AL = critical section number (00h-0Fh) (see AH=80h) 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 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 DOS versions <= 6.00, and points at an IRET --------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 - RM386 v6.00 - CLOAKING - CALL PROTECTED-MODE PASSALONG CHAIN Note: 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. Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's Netroom SeeAlso: INT 2C/AX=0009h --------m-2C0000----------------------------- INT 2C P - RM386 v6.00 - 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 below) Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's Netroom Note: this INT 2C interface is used by Netroom's DPMI.EXE v3.00 SeeAlso: AX=0001h,AX=0002h,AX=0003h,AX=0004h,AX=0005h,INT 31/AH=57h Values for 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 - RM386 v6.00 - CLOAKING - FREE GDT SELECTOR AX = 0001h SI = selector Return: CF clear if successful CF set on error AX = error code (see AX=0000h) SeeAlso: AX=0000h --------m-2C0002----------------------------- INT 2C P - RM386 v6.00 - 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 AX=0000h) Return: AX=0000h,AX=0003h,AX=0004h,INT 31/AX=0007h --------m-2C0003----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET SEGMENT LIMIT AX = 0003h SI = selector EBX = new limit Return: CF clear if successful CF set on error AX = error code (see AX=0000h) SeeAlso: AX=0000h,AX=0002h,AX=0004h,INT 31/AX=0008h --------m-2C0004----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET SEGMENT ACCESS MODE AX = 0004h SI = selector CL = new access mode byte Return: CF clear if successful CF set on error AX = error code (see AX=0000h) SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0005h,INT 31/AX=0009h --------m-2C0005----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET SEGMENT EXTENDED ACCESS MODE AX = 0005h SI = selector CL = new extended access mode byte (limit field ignored) Return: CF clear if successful CF set on error AX = error code (see AX=0000h) SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0004h,INT 31/AX=0009h --------m-2C0006----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - GET PROTECTED-MODE INTERRUPT VECTOR AX = 0006h CL = vector Return: CF clear DX:EBX -> current interrupt handler SeeAlso: AX=0007h,INT 31/AX=0204h --------m-2C0007----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET PROTECTED-MODE INTERRUPT VECTOR AX = 0007h CL = vector DX:EBX -> interrupt handler Return: CF clear SeeAlso: AX=0006h,INT 31/AX=0205h --------m-2C0008----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - GET PASSALONG ADDRESS AX = 0008h Return: CF clear DX:EBX = current passalong address SeeAlso: AX=0009h,AX=002Ch --------m-2C0009----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET PASSALONG ADDRESS AX = 0009h DX:EBX = new value for passalong address Return: CF clear Note: when an INT 2C instruction is executed in V86 mode, RM386 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) SeeAlso: AX=0008h,AX=002Dh,INT 2C"CLOAKING" Passalong address called with: EAX = CS:IP of byte following INT 2C instruction invoking passalong SS:EBX -> caller registers (see below) CF clear others undefined Return: CF clear: pass along to V86-mode INT 2C handler CF set: return immediately to V86 mode Format of caller registers: Offset Size Description 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 - RM386 v6.00 - 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 AX=0000h) Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's Netroom SeeAlso: AX=0000h,AX=0002h,AX=000Bh --------m-2C000B----------------------------- INT 2C P - RM386 v6.00 - 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 AX=0000h) SeeAlso: AX=000Ah --------m-2C--------------------------------- INT 2C P - RM386 v6.00 - CLOAKING - RESERVED FOR CLOAKED BIOS USE UNDER WINDOWS AX = function (000Ch-001Fh) --------m-2C0020----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - GET SIZE OF PROTECTED-MODE STATE AX = 0020h Return: EAX = number of bytes required for storing state SeeAlso: AX=0021h,AX=0022h --------m-2C0021----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SAVE PROTECTED-MODE STATE AX = 0021h ES:EDI -> buffer for protected-mode state Return: CF clear buffer filled SeeAlso: AX=0020h,AX=0022h --------m-2C0022----------------------------- INT 2C P - RM386 v6.00 - 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) SeeAlso: AX=0020h,AX=0021h --------m-2C0023----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - ISSUE PROTECTED-MODE XMS CALL AX = 0023h Note: not currently implemented--NOP in RM386 v6.00 --------m-2C0024----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET V86-MODE STACK AX = 0024h DX:EBX = new value for V86-mode SS:ESP Return: nothing --------m-2C0025----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - CALL V86-MODE PROCEDURE AX = 0025h DS:EBX -> client register structure (see AX=0009h) Return: CF clear if successful client register structure updated CF set if no more nested procedure call space available Note: this call uses the V86-mode stack supplied in the client structure, and calls the routine specified by CS:IP in the client structure SeeAlso: AX=0026h,AX=0027h,INT 31/AX=0301h --------m-2C0026----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - CALL V86-MODE INTERRUPT HANDLER AX = 0026h DS:EBX -> client register structure (see AX=0009h) CX = interrupt number Return: CF clear if successful client register structure updated CF set if no more nested procedure call space available Note: this call uses the V86-mode stack supplied in the client structure SeeAlso: AX=0025h,AX=0027h,INT 31/AX=0300h --------m-2C0027----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - CHAIN TO V86-MODE INTERRUPT HANDLER AX = 0027h DS:EBX -> client register structure (see AX=0009h) Return: CF clear if successful client register structure updated CF set if no more nested procedure call space available Note: 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 SeeAlso: AX=0025h,AX=0026h --------m-2C0028----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - GET ESP0 FROM TSS AX = 0028h Return: CF clear EAX = TSS's ESP0 Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's Netroom --------m-2C0029----------------------------- INT 2C P - RM386 v6.00 - 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 --------m-2C002A----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET 8259 IRQ BASE VECTORS AX = 002Ah BL = base vector of master interrupt controller CL = base vector of slave interrupt controller Note: this call merely informs RM386 that the caller has changed the interrupt mappings SeeAlso: INT 67/AX=DE0Bh --------m-2C002BCH81------------------------- INT 2C P - RM386 v6.00 - 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 Note: these functions are equivalent to the INT 4B/AX=81xxh subfunctions with the same numbers SeeAlso: INT 4B/AX=8102h,INT 4B/AX=810Ch --------m-2C002C----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - GET PORT-TRAPPING PASSALONG AX = 002Ch Return: CF clear DX:EBX = current I/O trapping passalong address SeeAlso: AX=0008h,AX=002Dh --------m-2C002D----------------------------- INT 2C P - RM386 v6.00 - CLOAKING - SET PORT-TRAPPING PASSALONG AX = 002Dh DX:EBX = new I/O trapping passalong address Return: CF clear Note: 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) SeeAlso: AX=0009h,AX=002Ch,INT 67/AX=5DEAh Port-trapping passalong address called with: EAX = CS:IP of faulting instruction (unless executing in protected-mode ring 3) SS:EBX -> caller register structure (see AX=0009h) 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 - RM386 v6.00 - 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) Program: RM386 (RAM-MAN/386) is the memory manager included in Helix Software's Netroom SeeAlso: AX=002Fh,AX=0030h --------m-2C002F----------------------------- INT 2C PU - RM386 v6.00 - 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) SeeAlso: AX=002Eh,AX=0030h --------m-2C0030----------------------------- INT 2C PU - RM386 v6.00 - 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) 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 --------D-2D--------------------------------- INT 2D - DOS 2+ - RESERVED Note: this vector is not used in DOS versions <= 6.00, and points at an IRET --------t-2D--------------------------------- INT 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.5.1] AH = multiplex number AL = function 00h installation check 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 below) identifying the program using the multiplex number 01h get entry point Return: AL = 00h if all API calls via INT 2D AL = FFh if entry point supported DX:BX -> entry point for bypassing interrupt chain 02h uninstall DX:BX = return address for successful uninstall (may be ignored by TSR) Return: AL = status 00h not implemented 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 FFh successful return at DX:BX with AX destroyed if successful and TSR honors specific return address 03h request pop-up 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 04h determine chained interrupts BL = interrupt number (except 2Dh) Return: AL = status 00h not implemented 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 below) FFh interrupt not hooked Notes: 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. 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 thru 03h are disparaged and will be removed from the next version of this specification; they are included for compatibility with version 3.3, though they were probably never used in any implementation 05h get hotkeys Return: AL = status 00h not implemented FFh supported DX:BX -> hotkey list (see below) 06h-0Fh reserved for future enhancements Return: AL = 00h (not implemented) other application-dependent 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 3.5 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. 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 users of this proposal should adhere to the IBM interrupt sharing protocol (see below), which will permit removal of TSRs in arbitrary order and interrupt handler reordering. All TSRs following this proposal should be removable, though they need not keep the code for removing themselves resident; it is acceptable for a separate program to perform the removal. A sample implementation including example TSRs and utility programs may be found in a separate package distributed as AMISLnnn.ZIP (AMISL091.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 2F 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 Index: uninstall;Alternate Multiplex Interrupt Specification|uninstall;AMIS Index: entry point;Alternate Multiplex Interrupt|entry point;AMIS Format of signature string: Offset Size Description 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 Format of interrupt hook list [array]: Offset Size Description 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 below) Format of hotkey list: Offset Size Description 00h BYTE type of hotkey checking bit 0: checks before chaining INT 09 bit 1: checks after chaining INT 09 bit 2: checks before chaining INT 15/AH=4Fh bit 3: checks after chaining INT 15/AH=4Fh bit 4: checks on INT 16/AH=00h,01h,02h bit 5: checks on INT 16/AH=10h,11h,12h bit 6: checks on INT 16/AH=20h,21h,22h bit 7: reserved (0) 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 below) 03h WORD disallowed shift states (see below) 05h BYTE flags bit 0: hotkey chained before processing bit 1: hotkey chained after processing bit 2: others should pass through this hotkey so that it can be monitored bit 3: hotkey will not activate if other keys pressed/released before hotkey press is completed bit 4: this key is remapped into some other key bit 5-7: reserved (0) 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. 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. 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 Bitfields for shift states: bit 0 right shift pressed bit 1 left shift pressed bit 2 either control key pressed bit 3 either Alt key pressed bit 4 ScrollLock active bit 5 NumLock active bit 6 CapsLock active bit 7 either shift key pressed bit 8 left control key pressed bit 9 left Alt key pressed bit 10 right control key pressed bit 11 right Alt key pressed bit 12 ScrollLock pressed bit 13 NumLock pressed bit 14 CapsLock pressed bit 15 SysRq key pressed Format of interrupt sharing protocol interrupt handler entry point: Offset Size Description 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) 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 'CSJewell' 'Modula3L' Curtis Jewell's Modula-3 compiler (non-TSR) 'ECLIPSE ' 'PLUMP ' Eclipse Software's printer and plotter spooler 'GraySoft' 'GIPC ' GraySoft's Inter-Process Communications driver 'heathh ' 'Monitor ' 'J. Berry' 'RATSR ' RemoteAccess Network Manager workstation module 'JWB ' 'RAMLIGHT' James Birdsall's on-screen RAMdisk activity indicator 'Nildram ' 'ST ' Screen Thief graphics screen grabber 'R-Ware ' 'dLite ' run-time data decompression TSR 'Ralf B ' 'FASTMOUS' example TSR included with sample AMIS library code 'Ralf B ' 'NOLPT n ' example TSR -- turn LPTn into bit-bucket 'Ralf B ' 'NOTE ' example TSR -- popup note-taker 'Ralf B ' 'RBkeyswp' RBkeyswap v3.0+ -- swap Esc/~ and LCtrl/CapsLock keys 'Ralf B ' 'SWITCHAR' example TSR -- add switchar() support removed from DOS5 'Ralf B ' 'VGABLANK' example TSR -- VGA-only screen blanker 'Sally IS' 'Mdisk ' removeable, resizeable RAMdisk 'Sally IS' 'Scr2Tex ' screen dumper with output in (La)Tex format '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 --------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 below) 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 parameter block: Offset Size Description 00h BYTE TSR flags bit 0: deny FCB access bit 1: dLite sleeping rather than activated bit 2: always indicate original filesize when reading directory entries, rather than only for specified programs bits 3-7 reserved 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) --------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 below) CX = Record of features loaded (see below) ES:DI -> Burnout Plus control structure (see below) Program: Burnout Plus is a DOS screen saver from Cove Software SeeAlso: INT 2D"AMIS" Index: screen saver;Burnout Plus Bitfields for status: bit 0 screen is blanked bit 1 MS Windows is active (Burnout Plus deactivated) bits 2-15 reserved Bitfields for features loaded/features enabled: bit 0 mouse activity monitor bit 1 passkey support bit 2 password support bit 3 continuous clear bit 4 software blanking bit 5 video activity monitor bit 6 disk activity monitor bit 7 activating keystroke suppression Format of Burnout Plus control structure: Offset Size Description 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 below) the bits for password, passkey, and software blanking are ignored and cannot be enabled or disabled externally 0Bh WORD features enabled (see above) 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 status information: bit 0 Burnout Plus disabled bit 1 force screen to blank on next clock tick bit 2 restore screen if currently blanked bits 3-15 reserved Note: bits 1 and 2 are automatically cleared by Burnout Plus after blanking or restoring the screen --------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??? --------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" --------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" --------l-2E--------------------------------- INT 2E U - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION DS:SI -> commandline to execute (see below) 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 commandline: Offset Size Description 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 am proposing 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 --------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 below) 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 vector table entry: Offset Size Description 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 below) 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 author_name_ver table: Offset Size Description -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 bits 0-2: 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) bits 3-6 reserved bit 7 set if extra_table defined and supported -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 below) -6 WORD offset to extra_area table (see bit 7 in offset -10 and below) -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) Format of vector_area table: Offset Size Description -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 Format of extra_area table (needed only to improve relocation feature): Offset Size Description 00h WORD offset to external_ctrl table (0 if not supported) 02h WORD reserved for future use (0) Format of external_ctrl table: Offset Size Description 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.COM - GIVE PRINT A TIME SLICE AX = 0080h Return: after PRINT executes Note: PRINT returns AL=01h if AH=00h but AL is not 80h on entry --------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+ PRINT.COM - INSTALLATION CHECK AX = 0100h Return: AL = status 00h not installed 01h not installed, but not OK to install FFh installed 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+ PRINT.COM - SUBMIT FILE FOR PRINTING AX = 0101h DS:DX -> submit packet (see below) Return: CF clear if successful AL = status 01h added to queue 9Eh now printing CF set on error AX = error code (see below, also INT 21/AH=59h) SeeAlso: AX=0102h Format of submit packet: Offset Size Description 00h BYTE level (must be 00h) 01h DWORD pointer to ASCIZ filename (no wildcards) Values for PRINT error code: 01h invalid function 02h file not found 03h path not found 04h out of file handles 05h access denied 08h print queue full 09h spooler busy 0Ch name too long 0Fh 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 AX=0101h) 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 AX=0101h) 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+ PRINT.COM - 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 AX=0101h) SeeAlso: AX=0101h,AX=0103h --------c-2F0103----------------------------- INT 2F - DOS 3+ PRINT.COM - CANCEL ALL FILES IN PRINT QUEUE AX = 0103h Return: CF clear if successful CF set on error AX = error code (see AX=0101h) SeeAlso: AX=0102h --------c-2F0104----------------------------- INT 2F - DOS 3+ PRINT.COM - 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 AX=0101h) 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+ PRINT.COM - RESTART PRINT QUEUE AFTER STATUS READ AX = 0105h Return: CF clear if successful CF set on error AX = error code (see AX=0101h) Desc: restart PRINT's activities once an application finishes examining the print queue SeeAlso: AX=0104h --------c-2F0106----------------------------- INT 2F - DOS 3.3+ PRINT.COM - GET PRINTER DEVICE AX = 0106h Return: CF set if files in print queue AX = error code 0008h (queue full) DS:SI -> device driver header CF clear if print queue empty AX = 0000h Desc: determine which device, if any, PRINT is currently using for output Notes: documented for DOS 5+, but not documented for prior versions 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+ 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+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING AH = 05h ---DOS 3.x--- AL = extended error code (not zero) ---DOS 4+ --- 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+ 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+ ASSIGN - GET DRIVE ASSIGNMENT TABLE AX = 0601h Return: ES = segment of ASSIGN work area and assignment table Note: under DOS 3+, 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 --------D-2F0800----------------------------- INT 2F U - DRIVER.SYS support - INSTALLATION CHECK AX = 0800h Return: AL = 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 Note: supported by DR-DOS 5.0 --------D-2F0801----------------------------- INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE AX = 0801h DS:DI -> drive data table (see AX=0803h) 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 SeeAlso: AX=0803h --------D-2F0802----------------------------- INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST AX = 0802h ES:BX -> device driver request header (see below) 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+ executes this function on AL=02h and AL=04h-F7h the command codes 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 SeeAlso: AX=0800h,AX=0801h,AX=0803h,INT 21/AH=52h,INT 21/AH=99h,INT 21/AH=9Ah Values for 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+) DEVICE OPEN 0Eh (DOS 3+) DEVICE CLOSE 0Fh (DOS 3+) REMOVABLE MEDIA (block devices) 10h (DOS 3+) 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+) 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 Format of device driver request header: Offset Size Description 00h BYTE length of request header 01h BYTE subunit within device driver 02h BYTE command code (see above) 03h WORD status (filled in by device driver) bit 15: error bits 14-11: reserved bit 10: ??? set by DOS kernel on entry to some driver calls bit 9: busy bit 8: done (may be clear on return under European MS-DOS 4.0) bits 7-0: error code if bit 15 set (see below) ---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 (return) number of units 0Eh DWORD (call) pointer to DOS device helper function (see below) (European MS-DOS 4.0 only) (call) pointer past end of memory available to driver (DOS 5+) (return) address of first free byte following driver 12h DWORD (call) pointer to commandline arguments (return) pointer to BPB array (block drivers) or 0000h:0000h (character drivers) 16h BYTE (DOS 3+) 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 (return) error-message flag 0001h MS-DOS should display error msg on init failure ---command code 01h--- 0Dh BYTE media descriptor 0Eh BYTE returned status 00h don't know 01h media has not changed FFh media has been changed 0Fh DWORD (return, DOS 3+) pointer to previous volume ID if 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 INT 21/AH=53h) ---command codes 03h,0Ch--- (see also INT 21/AX=4402h,INT 21/AX=4403h) 0Dh BYTE media descriptor (block devices only) 0Eh DWORD transfer address 12h WORD (call) number of bytes to read/write (return) actual number of bytes read or written ---command codes 04h,08h,09h--- 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+) pointer to volume ID if error 0Fh returned 1Ah DWORD (DOS 4+) 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 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 (return) 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 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 (# sectors between consec portions) ---command code 83h--- 0Dh BYTE addressing mode (see above) 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 (see above) 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 (see above) 0Eh DWORD transfer address (ignored in write mode 0) 12h WORD number of sectors to write 14h DWORD starting sector number (see also 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 (# sectors between consec portions) Values for 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 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 below) Note: the queue size field must be set before calling 0Dh "QueueWrite" put a character in the queue DS:BX -> character queue (see below) 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 below) 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 character queue: Offset Size Description 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+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST AX = 0803h Return: DS:DI -> first drive data table in list Note: not available under DR-DOS 5.0 SeeAlso: AX=0801h Format of DOS 3.30 drive data table: Offset Size Description 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 INT 21/AX=440Dh) 29h WORD bit flags describing drive (see below) 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) Format of COMPAQ DOS 3.31 drive data table: Offset Size Description 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 DOS 4.0-6.0 drive data table below) 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 INT 21/AX=440Dh) 35h WORD bit flags describing drive (see below) 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) Format of DOS 4.0-6.0 drive data table: Offset Size Description 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 (see 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 INT 21/AX=440Dh) 23h WORD bit flags describing drive (see below) 25h WORD number of cylinders 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 Bitfields for flags describing drive: bit 0 fixed media bit 1 door lock ("changeline") supported bit 2 current BPB locked bit 3 all sectors in a track are the same size bit 4 physical drive has multiple logical units bit 5 current logical drive for physical drive bit 6 disk change detected bit 7 set DASD before formatting bit 8 disk reformatted bit 9 unformatted (fixed media only, disables reads and writes) --------f-2F1000----------------------------- INT 2F - SHARE - INSTALLATION CHECK AX = 1000h Return: AL = 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 Note: this function is also supported by SuperStor, a disk-compression program by Addstor which is bundled with DR-DOS 6.0 SeeAlso: AX=1000h,X=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-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-2F1100----------------------------- INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK AX = 1100h 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 --------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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 SS:BX -> fully-qualified directory name SDA CDS pointer -> current directory structure for drive with dir Return: CF set on error AX = DOS error code (see INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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,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 INT 21/AH=59h) 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 INT 21/AH=59h) 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+) - 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 below) ES:DI -> SFT SFT DPB field -> DPB of drive containing file SS = DOS DS Return: CF set on error AL = DOS error code (see INT 21/AH=59h) 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 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 INT 21/AH=59h) 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: AL = sectors per cluster AH = media ID byte BX = total clusters CX = bytes per sector DX = number of available clusters 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=3Dh) Return: CF set on error AX = DOS error code (see INT 21/AH=59h) 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 INT 21/AH=3Ch) high byte = 00h normal create, 01h create new file Return: CF set on error AX = DOS error code (see INT 21/AH=59h) 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 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 INT 21/AH=59h) CF clear if successful [DTA] = updated findfirst search data (bit 7 of first byte must be set) [DTA+15h] = standard directory entry for file 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 --------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 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 INT 21/AH=59h) CF clear if successful [DTA] = updated findfirst search data (bit 7 of first byte must be set) [DTA+15h] = standard directory entry for file Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1119h,AX=111Ch,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 [DTA] = 21-byte findfirst search data (see INT 21/AH=4Eh) Return: CF set on error AX = DOS error code (see INT 21/AH=59h) CF clear if successful [DTA] = updated findfirst search data (bit 7 of first byte must be set) [DTA+15h] = standard directory entry for file Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1119h,AX=111Bh,INT 21/AH=4Fh --------N-2F111D----------------------------- INT 2F CU - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS (ABORT) AX = 111Dh SS = DOS DS 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 INT 21/AH=59h) 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 INT 21/AH=59h) 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 INT 21/AH=59h) CF clear if successful DX:AX = new file position Note: this function is called by the DOS 3.1+ kernel SeeAlso: AX=1228h,INT 21/AH=42h --------N-2F1122----------------------------- INT 2F CU - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK AX = 1122h SS = DOS DS ??? Return: ??? Note: this function is called by the DOS 3.1+ kernel --------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 INT 21/AH=59h) 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 INT 21/AH=59h) --------N-2F1128----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED AX = 1128h Return: CF set AX = 0001h (invalid function) (see INT 21/AH=59h) --------N-2F1129----------------------------- INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED AX = 1129h Return: CF set AX = 0001h (invalid function) (see INT 21/AH=59h) --------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 INT 21/AH=59h) CF clear if successful Note: this function is called by the DOS 4.0 kernel --------N-2F112C----------------------------- INT 2F CU - NETWORK REDIRECTOR (DOS 4+) - "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+) - 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 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+ kernel 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 INT 21/AH=59h) 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 below) 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 DosReadAsynchNmPipe stack frame: Offset Size Description 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 below) Return: CF clear if successful CF set if error AX = error code SeeAlso: AX=1186h,AX=1191h,INT 21/AX=5F3Ah Format of DosReadAsynchNmPipe stack frame: Offset Size Description 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 Return: CF clear if successful CF set if error AX = error code SeeAlso: AX=1186h,AX=1191h Format of DosReadAsynchNmPipe2 stack frame: Offset Size Description 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 below) Return: CF clear if successful CF set if error AX = error code SeeAlso: AX=118Fh,AX=1190h,INT 21/AX=5F3Ah Format of DosReadAsynchNmPipe2 stack frame: Offset Size Description 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+ internal - INSTALLATION CHECK AX = 1200h Return: AL = FFh (for compatibility with other INT 2F functions) --------D-2F1201----------------------------- INT 2F U - DOS 3+ 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+ internal - GET INTERRUPT ADDRESS AX = 1202h STACK: WORD vector number Return: ES:BX -> interrupt vector STACK unchanged --------D-2F1203----------------------------- INT 2F U - DOS 3+ 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+ 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+ 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+ internal - INVOKE CRITICAL ERROR AX = 1206h DI = error code BP:SI -> device driver header 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+ 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+ 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+ 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+ 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+ 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 INT 21/AH=59h) 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+ 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+ 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 INT 21/AX=5700h) DX = current time in packed format (see INT 21/AX=5700h) SeeAlso: INT 21/AH=2Ah,INT 21/AH=2Ch --------D-2F120E----------------------------- INT 2F U - DOS 3+ 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+ 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+ 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+ 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+ 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+ 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+ 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 --------D-2F1215----------------------------- INT 2F U - DOS 3+ 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+ 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 CF set if BX greater than FILES= Note: supported by DR-DOS 5+ SeeAlso: AX=1220h --------D-2F1217----------------------------- INT 2F U - DOS 3+ 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+ 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+ 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+ 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+ 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 --------D-2F121C----------------------------- INT 2F U - DOS 3+ 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+ 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+ 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+ 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+ 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+ 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+ 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,INT 21/AX=5D0Ah --------D-2F1223----------------------------- INT 2F U - DOS 3+ 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+ 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+ 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 INT 21/AH=59h) 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 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 --------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 (entry point not set if SI = FFFFh for DOS 4+) 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 DOS 3.30+ FASTOPEN 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 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 ??? 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 ??? ??? --------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, it returns 0000h:0000h SeeAlso: INT 21/AH=52h --------D-2F122D----------------------------- INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE AX = 122Dh Return: AX = current extended error code SeeAlso: AX=1222h,INT 21/AH=59h --------D-2F122E----------------------------- INT 2F U - DOS 4+ internal - GET OR SET ERROR TABLE ADDRESSES AX = 122Eh DL = subfunction 00h get standard DOS error table 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 below) 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 Format of DOS 4.x error table: Offset Size Description 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 Call error retrieval function with: AX = error number 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 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-2F12FFBX0006----------------------- INT 2F U - DR-DOS 6 - 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 Note: this functionality is provided by EMM386, and partially supported by HIDOS.SYS SeeAlso: AX=D201h/BX=4849h --------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 below) BX = new code page (see 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 00h 8 BYTEs ??? 08h 64 BYTEs name of country information file 48h WORD system code page 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 INT 21/AX=6602h) DX = country code (see INT 21/AH=38h) DS:SI -> internal code page structure (see AX=1401h) 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 0001h process does not own screen 0004h unknown error 0005h invalid pointer SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1403h"POPUP" --------U-2F1403----------------------------- INT 2F CU - NLSFUNC.COM - SET CODE PAGE AX = 1403h DS:SI -> internal code page structure (see AX=1401h) BX = code page (see INT 21/AX=6602h) DX = country code (see 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 AX=1402h"POPUP") 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 INT 21/AX=6602h) DX = country code (see INT 21/AH=38h) DS:SI -> internal code page structure (see AX=1401h) 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 INT 21/AX=6602h) DX = country ID (FFFFh=current country) (see 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: AX=14FFh,INT 21/AH=65h Format of DR-DOS COUNTRY.SYS file: Offset Size Description 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 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 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 SeeAlso: INT 2F/AX=D000h"Lotus" --------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 --------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) --------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 (15=invalid drive,21=not ready) CF clear if successful 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 = 0000h if drive not supported nonzero if supported SeeAlso: AX=150Dh --------d-2F150C----------------------------- INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION AX = 150Ch Return: BH = major version BL = minor version Note: MSCDEX.EXE versions prior to 2.00 return BX=0 --------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 below) 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) Format of directory entry (direct copy): Offset Size Description 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 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 Format of directory entry (canonicalized): Offset Size Description 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 --------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 AX=0802h) --------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 below) 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 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 ENH 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 below) DS:SI -> virtual86 mode enable/disable callback or 0000h:0000h 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 SeeAlso: AX=1606h,AX=1608h,AX=4B05h Format of Startup Information Structure: Offset Size Description 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 below) (only used if above nonzero) 0Eh DWORD pointer to instance data records or 0000h:0000h Format of one Instance Item in array: Offset Size Description 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 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 Virtual mode enable/disable procedure 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 ENH 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 SeeAlso: AX=1605h,AX=1609h --------W-2F1607----------------------------- INT 2F - MS Windows - VIRTUAL DEVICE CALL OUT API AX = 1607h BX = virtual device ID (see INT 2F/AX=1684h) 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=1684h,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-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 below) 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=0015h Values for 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 - 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 below) 0001h set patches in DOS DX = bit mask of patch requests bit 0 enable critical sections bit 1 NOP setting/checking user ID bit 2 turn INT 21/AH=3Fh on STDIN into polling loop bit 3 trap stack fault in "SYSINIT" to WIN386 bit 4 BIOS patch to trap "Insert disk X:" to WIN386 Return: AX = B97Ch BX = bit mask of patches applied DX = A2ABh 0002h remove patches in DOS (ignored by DOS 5.0 kernel) DX = bit mask of patch requests (see function 0001h) 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: all 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,AX=1684h Format of patch table: Offset Size Description 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 --------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 below) 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 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 below) 18h DWORD pointer to TSR data block or 0000h:0000h Format of Norton Utilities 6.0 TSR ID block: Offset Size Description 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 = 00h if the call is supported AL = 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 will be supported 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 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,AX=1685h,AX=168Bh --------W-2F1684----------------------------- INT 2F - MS Windows - GET DEVICE API ENTRY POINT AX = 1684h BX = virtual device (VxD) ID (see below) 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 Values for VxD ID: Value Name CallOut V86 PM Description 01h VMM N N Virtual Machine Manager 02h Debug 03h VPICD Y Y Virtual Prog. Interrupt Controller (PIC) Device 04h VDMAD N N Virtual Direct Memory Access (DMA) Device 05h VTD Y Y Virtual Timer Device 06h V86MMGR N N Virtual 8086 Mode Device 07h PageSwap N N Paging Device 08h Parity N N Parity-check trapper 09h Reboot N Y Ctrl-Alt-Del handler 0Ah VDD N Y Virtual Display Device (GRABBER) 0Bh VSD N N Virtual Sound Device 0Ch VMD Y Y Y Virtual Mouse Device 0Dh VKD N Y Virtual Keyboard Device 0Eh VCD N Y Virtual COMM Device 0Fh VPD Virtual Printer Device 10h VHD Virtual Hard Disk Device (Windows 3.0) 10h BLOCKDEV N N Virtual Hard Disk Device (Windows 3.1) 10h IOS N Y (Chicago) 11h VMCPD Y Y Virtual Math CoProcessor Device 12h EBIOS N N Reserve EBIOS page (e.g., on PS/2) 13h BIOSXLAT N N Map ROM BIOS API between prot & V86 mode 14h VNETBIOS Y N N Virtual NetBIOS Device 15h DOSMGR Y N 16h WINLOAD 17h SHELL N Y 18h VMPOLL N N 19h VPROD 1Ah DOSNET N N assures network integrity across VMs 1Ah VNETWARE Y Y Novell NetWare DOSNET replacement 1Bh VFD N N Virtual Floppy Device 1Ch VDD2 Secondary display adapter 1Ch LoadHi N N Netroom LoadHi Device (RMLODHI.VXD) 1Ch LoadHi N N 386MAX LoadHi Device (386MAX.VXD) 1Ch LoadHi N N Win386 LoadHi Device (EMM386.EXE) 1Dh WINDEBUG N Y 1Dh TDDebug N Y 1Eh TSRLoad TSR instance utility 1Fh BiosHook BIOS interrupt hooker VxD 20h Int13 N N N 21h PageFile N Y Paging File device 22h SCSI 23h MCA_POS 24h SCSIFD SCSI FastDisk device 25h VPEND Pen device 26h APM Advanced Power Management 27h VXDLDR Y Y (Chicago) 2Ah VWIN32 N Y (Chicago) 2Bh VCOMM Y Y (Chicago) 30h MACH32 N Y ATI Mach32 video card 33h CONFIGMG Y Y (Chicago) 33h EDOS N N Windows DOS Box Enhancer by Mom's Software 36h VFBACKUP Y Y (Chicago) 38h VCOND Y Y (Chicago) 51h ISAPNP N N 8Dh ESDI_506 N N (Chicago) 90h voltrack N N FDh FAKEIDE N N (Chicago) 0102h CV1 N N Microsoft C/C++ 7.00+ CodeView for Windows 0200h VIPX Y Y NetWare Virtual IPX Driver 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) 0206h VTXRX N N Novell Virtual TXRX Driver (LANalyzer for Win) 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 0460h UNIMODEM N Y 0483h VSHARE N N Windows for Workgroups Virtual SHARE 0484h IFSMgr Y N (Chicago) installable file system manager 0486h VFAT Y Y (Chicago) 048Bh VCACHE Y Y 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 21EAh VADLIBWD N Y Adlib Waveform Driver by John Ridges 2200h VFINTD Y Y Norton VFINTD (Norton Desktop) 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) 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 28C0h VXD N Y Y Generic VxD for real and protected mode by Andrew Schulman in MSJ February 1993 292Dh VSBPD Y Y Sound Blaster Pro 3098h VstlthD N N N for QEMM Stealth ROM mode 310eh WPS N N MS DevNet CD-ROM: Windows Process Status 7FE0h VWFD N Y Y ??? by Neil Sandlin of Microsoft 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 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 Note: The high bit of the VxD ID is reserved for future use. The next 10 bits are the OEM # which is assigned by Microsoft. The low 5 bits are the device number. Naturally, this scheme has not been adhered to since there are now more than 32 different VxDs. Call VTD.386 entry point with: AX = 0000h get VTD version number Return: AH = major version AL = minor version AX = 0100h get current clock tick time Return: EDX:EAX = clock tick time in 840ns units since Windows was started AX = 0101h get current system time in milliseconds Return: EAX = time in milliseconds that Windows has been running AX = 0102h get current virtual machine time Return: EAX = cumulative amount of time the virtual machine has been active, in milliseconds Note: should only be called directly when TOOLHELP.DLL TimerCount() cannot be called 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) --------W-2F1685----------------------------- INT 2F - MS Windows - SWITCH VMs AND CALLBACK AX = 1685h BX = VM ID of virtual machine to switch to CX = flags bit 0 wait until interrupts enabled bit 1 wait until critical section unowned bits 2-15 reserved (zero) DX:SI = priority boost (see 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 --------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 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 38/AH=10h Call 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-2F1688----------------------------- INT 2F U - MS Windows 3.0, 386MAX v6.01 - GET SELECTOR TO LDT AX = 1688h Return: AX = status??? (0000h for 386MAX) BX = selector for ??? --------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 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 Vendor names: "MS-DOS" ??? and 386MAX v6.00+ "386MAX" 386MAX v6.00+ "HELIX_DPMI" Helix Netroom's DPMI server "Phar Lap" Phar Lap 286|DOS-Extender RUN286 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) Return: AL = 00h if focus set to specified VM Note: documented on the Microsoft Developer's Network CD-ROM SeeAlso: AX=1683h --------W-2F168C----------------------------- INT 2F - MS Windows 3.1 - RESTART COMMAND AX = 168Ch ??? Return: ??? Note: WIN.COM executes specified application --------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 Index: installation check;WINOLDAP --------W-2F1701----------------------------- INT 2F - MS Windows "WINOLDAP" - OPEN CLIPBOARD AX = 1701h Return: AX <> 0 success AX = 0 clipboard is already open --------W-2F1702----------------------------- INT 2F - MS Windows "WINOLDAP" - EMPTY CLIPBOARD AX = 1702h Return: AX <> 0 clipboard has been emptied AX = 0 failure --------W-2F1703----------------------------- INT 2F - MS Windows "WINOLDAP" - SET CLIPBOARD DATA AX = 1703h DX = clipboard format supported by WinOldAp: 01h text 02h bitmap 03h metafile picture 04h SYLK 05h DIF 06h TIFF 07h OEM text 81h DSP text 82h DSP bitmap ES:BX -> data (see below) SI:CX = size of data Return: AX <> 0 data copied into the Clipboard AX = 0 failure Format of bitmap: Offset Size Description 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 metafile picture: Offset Size Description 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 AX=1703h) Return: DX:AX = size of data in bytes, including any headers Failure: DX:AX = 0 no data in this format in the Clipboard --------W-2F1705----------------------------- INT 2F - MS Windows "WINOLDAP" - GET CLIPBOARD DATA AX = 1705h DX = clipboard format supported by WinOldAp (see AX=1703h) ES:BX -> buffer Return: AX <> 0 success AX = 0 error, or no data in this format in Clipboard --------W-2F1708----------------------------- INT 2F - MS Windows "WINOLDAP" - CloseClipboard AX = 1708h Return: AX <> 0 success AX = 0 failure --------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 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 Return: AX = integer value of the desired item (see below) Note: This function returns the device-capability bits for the given display 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 Bitfields for curve capabilities: bit 0 circles bit 1 pie wedges bit 2 chord arcs bit 3 ellipses bit 4 wide lines bit 5 styled lines bit 6 wide styled lines bit 7 interiors Bitfields for line capabilities: bit 1 polylines bit 2 markers bit 3 polymarkers bit 4 wide lines bit 5 styled lines bit 6 wide styled lines bit 7 interiors Bitfields for polygon capabilities: bit 0 polygons bit 1 rectangles bit 2 trapezoids bit 3 scanlines bit 4 wide borders bit 5 styled borders bit 6 wide styled borders bit 7 interiors Bitfields for text capabilities: bit 0 output precision character bit 1 output precision stroke bit 2 clippping precision stroke bit 3 90-degree character rotation bit 4 arbitrary character rotation bit 5 independent X and Y scaling bit 6 double-size bit 7 integer scaling bit 8 continuous scaling bit 9 bold bit 10 italic bit 11 underline bit 12 strikeout bit 13 raster fonts bit 14 vector fonts bit 15 reserved Values for clipping capabilities: 00h none 01h clipping to rectangles Bitfields for raster capabilities: bit 0 simple bitBLT bit 1 device requires banding support bit 2 device requires scaling support bit 3 supports >64K bitmap ----------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 = 00h not installed FFh installed --------l-2F1901BL00------------------------- INT 2F U - DOS 4.x only SHELLB.COM - SHELLC.EXE INTERFACE AX = 1901h BL = 00h if SHELLC transient 01h if SHELLC 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 Explanation: 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. 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 = FFh if quoted batch file name matches last SHELLB parameter AL = 00h if 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 --------V-2F1A00----------------------------- INT 2F - DOS 4+ 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 - 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 Program: ANSIPLUS.SYS is a CON device driver by Kristofer Sweger which replaces the normal ANSI.SYS is a more powerful version with many additional features Note: ANSIPLUS also identifies itself as ANSI.SYS if BX,CX, or DX differ from the magic values above --------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 --------V-2F1A01----------------------------- INT 2F U - DOS 4+ 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 set on error AX = error code (many non-standard) CF clear if successful AX destroyed 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+ ANSI.SYS internal - MISCELLANEOUS REQUESTS AX = 1A02h DS:DX -> parameter block (see below) Note: DOS 5+ chains to previous handler if AL > 02h on call SeeAlso: AX=1A01h Format of parameter block: Offset Size Description 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 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=1A3Fh Values for 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 --------V-2F1A3E----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A3Eh CL = ??? CH = ??? DL = ??? DH = ??? Return: CL = ??? CH = ??? DL = ??? DH = ??? --------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=1A21h --------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 = 1A42h if ASD not installed = 0000h if no more room 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 = 1A43h if ASD not installed = 0000h if no more room 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 --------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=1A72h --------V-2F1A53----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A53h CL = ??? (00h-05h) ??? Return: ??? --------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=1A52h --------V-2F1A7B----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A7Bh Return: AX = 0000h CX = 0000h --------V-2F1A7D----------------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1A7Dh Return: AX = ??? --------V-2F1AADDX0000----------------------- INT 2F U - AVATAR.SYS v0.11 - ??? AX = 1AADh DX = 0000h CX = subfunction (00h-0Ch) ??? Return: AX = 0000h if DX was nonzero ??? --------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 --------V-2F23------------------------------- INT 2F - DR-DOS 5.0 GRAFTABL - GET GRAPHICS DATA AH = 23h AL nonzero Return: AH = FFh ES:BX -> graphics data SeeAlso: AX=2300h --------T-2F2700----------------------------- INT 2F - DR-DOS 6.0 TaskMAX - INSTALLATION CHECK AX = 2700h Return: AL = 00h not installed = FFh installed --------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 (DR-DOS 6.0 = 0001h) 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 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 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 below) 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 parameter block: Offset Size Description 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) 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 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) 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 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 SeeAlso: AX=2712h,AX=2716h,AX=2717h --------F-2F2A------------------------------- INT 2F - Gammafax DOS Dispatcher INTERFACE AH = 2Ah Note: details not available at this time SeeAlso: AX=8000h"FaxBIOS",AX=C000h"MTEZ",AX=CB00h,AX=CBDDh,INT 66"BitFax" --------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 below) 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: AX=3900h,AH=39h/BL=01h Values for 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 TSR modules: Offset Size Description 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 below) BYTE FFh terminator Format of interrupt list entry: Offset Size Description 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 AH=39h/BL=00h) 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) 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 bit 0: do not wrap at end of line bit 1: wait for beeps to end before displaying next character bit 2: do not use graphics cursor Return: AL = old flags SI,DI,DS,ES preserved SeeAlso: AX=3900h,AX=3912h/BL=03h --------W-2F4000----------------------------- INT 2F - Windows 3.x (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABLTIES AX = 4000h Return: AL = 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 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. --------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 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 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 --------E-2F4040----------------------------- INT 2F - PharLap 286|DOS-Extender Lite v2.5 - ??? AX = 4040h Return: BX:CX -> ??? --------N-2F4100----------------------------- INT 2F - DOS Enhanced LAN Manager 2.0+ MINIPOP/NETPOPUP - INSTALLATION CHECK AX = 4100h Return: CF clear if successful AL = FFh CF set on error AX = ??? Notes: MINIPOP and NETPOPUP provide a network message popup service LAN Manager enhanced mode adds features beyond the standard redirector file/printer services SeeAlso: AX=118Ah,AX=4103h,AX=4104h,AH=42h,AH=4Bh --------N-2F4103----------------------------- INT 2F - DOS Enhanced LAN Manager 2.0+ MINIPOP/NETPOPUP - ??? AX = 4103h Return: ??? SeeAlso: AX=4100h,AX=4104h --------N-2F4104----------------------------- INT 2F - DOS Enhanced LAN Manager 2.0+ MINIPOP/NETPOPUP - ??? AX = 4104h Return: ??? SeeAlso: AX=4100h,AX=4103h --------N-2F42------------------------------- INT 2F - LAN Manager 2.0 DOS Enhanced MSRV.EXE - MESSENGER SERVICE AH = 42h ??? Return: ??? Note: LAN Manager enhanced mode adds features beyond the standard redirector file/printer services SeeAlso: AX=118Ah,AX=4100h,AH=4Bh --------m-2F4300----------------------------- INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - INSTALLATION CHECK AX = 4300h Return: AL = 80h XMS driver installed AL <> 80h no driver Notes: XMS gives access to extended memory and noncontiguous/nonEMS memory above 640K this installation check DOES NOT follow the format used by other software SeeAlso: AX=4310h Index: installation check;XMS version 2+ --------m-2F4308----------------------------- INT 2F U - HIMEM.SYS v2.77+ - GET A20 HANDLER NUMBER AX = 4308h Return: AL = 43h if supported BL = A20 handler number (value of /MACHINE:nn switch) BH = AT A20 switch time (00h medium, 01h fast, 02h slow) SeeAlso: AX=4309h,AX=4330h --------m-2F4309----------------------------- INT 2F U - HIMEM.SYS v3.09+ - GET XMS HANDLE TABLE AX = 4309h Return: AL = 43h if function supported ES:BX -> XMS handle table (see below) Note: HIMEM.SYS v3.09 is part of MS-DOS 6.0. SeeAlso: AX=4308h Format of XMS handle table: Offset Size Description 00h BYTE ??? (01h in HIMEM.SYS v3.09) 01h BYTE size of one handle??? (0Ah in HIMEM.SYS v3.09) 02h WORD value of /numhandles= parameter (default = 20h) 04h DWORD pointer to XMS handle array (see below) Format of XMS handle [array]: Offset Size Description 00h BYTE flag 01h=free, 02h=used, 04h=unused 01h BYTE lock count (00h=unlocked) 02h DWORD address of XMS block in KB (shift left by 10 for abs. address) 06h DWORD size of XMS block in KB --------m-2F4310----------------------------- INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - GET DRIVER ADDRESS AX = 4310h Return: ES:BX -> driver entry point Note: HIMEM.SYS v2.77 chains to previous handler if AH is not 00h or 10h SeeAlso: AX=4300h Perform a FAR call to the driver entry point with AH set to the function code AH function 00h Get XMS version number Return: AX = XMS version (in BCD, AH=major, AL=minor) BX = internal revision number DX = 0001h if HMA (1M to 1M + 64K) exists 0000h if HMA does not exist 01h Request High Memory Area (1M to 1M + 64K) DX = memory in bytes (for TSR or device drivers) FFFFh if application program Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,90h,91h,92h) (see below) 02h Release High Memory Area Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,90h,93h) (see below) 03h Global enable A20, for using the HMA Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,82h) (see below) 04h Global disable A20 Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,82h,94h) (see below) 05h Local enable A20, for direct access to extended memory Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,82h) (see below) 06h Local disable A20 Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,82h,94h) (see below) 07h Query A20 state Return: AX = 0001h enabled = 0000h disabled BL = error code (00h,80h,81h) (see below) 08h Query free extended memory, not counting HMA BL = 00h (some implementations leave BL unchanged on success) Return: AX = size of largest extended memory block in KB DX = total extended memory in KB BL = error code (00h,80h,81h,A0h) (see below) 09h Allocate extended memory block DX = Kbytes needed Return: AX = 0001h success DX = handle for memory block = 0000h failure BL = error code (80h,81h,A0h) (see below) 0Ah Free extended memory block DX = handle of block to free Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,A2h,ABh) (see below) 0Bh Move extended memory block DS:SI -> EMM structure (see below) Note: if either handle is 0000h, the corresponding offset is considered to be an absolute segment:offset address in directly addressable memory Return: AX = 0001h success = 0000h failure BL = error code (80h-82h,A3h-A9h) (see below) 0Ch Lock extended memory block DX = handle of block to lock Return: AX = 0001h success DX:BX = 32-bit linear address of locked block = 0000h failure BL = error code (80h,81h,A2h,ACh,ADh) (see below) Note: MS Windows 3.x rejects this function for handles allocated after Windows started 0Dh Unlock extended memory block DX = handle of block to unlock Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,A2h,AAh) (see below) 0Eh Get handle information DX = handle for which to get info Return: AX = 0001h success BH = block's lock count BL = number of free handles left DX = block size in KB = 0000h failure BL = error code (80h,81h,A2h) (see below) BUG: MS Windows 3.10 acts as though unallocated handles are in use Note: MS Windows 3.00 has problems with this call 0Fh Reallocate extended memory block DX = handle of block BX = new size of block in KB Return: AX = 0001h success = 0000h failure BL = error code (80h,81h,A0h-A2h,ABh) (see below) 10h Request upper memory block (nonEMS memory above 640K) DX = size of block in paragraphs Return: AX = 0001h success BX = segment address of UMB DX = actual size of block = 0000h failure BL = error code (80h,B0h,B1h) (see below) DX = largest available block 11h Release upper memory block DX = segment address of UMB to release Return: AX = 0001h success = 0000h failure BL = error code (80h,B2h) (see below) 12h (XMS v3.0) Reallocate upper memory block DX = segment address of UMB to resize BX = new size of block in paragraphs Return: AX = 0001h success = 0000h failure BL = error code (80h,B0h,B2h) (see below) DX = maximum available size (RM386) 34h (QEMM 5.11 only, undocumented) ??? 44h (QEMM 5.11 only, undocumented) ??? 80h (Netroom RM386 v6.00) Reallocate upper memory block this function is identical to function 12h 81h (Netroom RM386 v6.00) re-enable HMA allocation Return: AX = 0001h (success) 82h (Netroom RM386 v6.00) Cloaking API DX = XMS handle of block containing protected-mode code CL = code size (00h 16-bit, else 32-bit) ESI, EDI = parameters to pass to protected-mode code Return: AX = status 0001h success 0000h failed BL = error code (A2h,B0h) (see below) Note: this calls offset 0 in the XMS memory block with EBX = physical address of block's start CS = code selector for XMS block at EBX (16-bit or 32-bit) DS = data selector for XMS block, starting at EBX ES = selector for V86 memory access to full real-mode 1088K GS = selector for full flat address space ESI, EDI from V86 mode 83h (Netroom RM386 v6.00) Create new UMB entry BX = segment of high-memory block DX = first page of start of block CX = number of consecutive pages in block DI = start of UMB in block Return: AX = 0001h (success) DI = segment of first high-DOS block Note: the new UMB is not linked into the high-memory chain 84h (Netroom RM386 v6.00) Get all XMS handles info CX = size of buffer for handle info ES:DI -> buffer for handle info (see below) Return: AX = 0001h (success) DX = current number of allocated XMS handles 88h (XMS v3.0) Query free extended memory Return: EAX = largest block of extended memory, in KB BL = status 00h success 80h not implemented (i.e. on a 286 system) 81h VDISK detected A0h all extended memory allocated ECX = physical address of highest byte of memory (valid even on error codes 81h and A0h) EDX = total Kbytes of extended memory (0 if status A0h) 89h (XMS v3.0) Allocate any extended memory EDX = Kbytes needed Return: AX = 0001h success DX = handle for allocated block (free with AH=0Ah) = 0000h failure BL = status (80h,81h,A0h,A1h,A2h) (see below) 8Eh (XMS v3.0) Get extended EMB handle information DX = handle Return: AX = 0001h success BH = block's lock count CX = number of free handles left EDX = block size in KB = 0000h failure BL = status (80h,81h,A2h) (see below) BUG: DOS 6.0 HIMEM.SYS leaves CX unchanged 8Fh (XMS v3.0) Reallocate any extended memory block DX = unlocked handle EBX = new size in KB Return: AX = 0001h success = 0000h failure BL = status (80h,81h,A0h-A2h,ABh) (see below) Notes: HIMEM.SYS requires at least 256 bytes free stack space the XMS driver need not implement functions 10h through 12h to be considered compliant with the standard BUG: HIMEM v3.03-3.07 crash on an 80286 machine if any of the 8Xh functions are called Error codes returned in BL: 00h successful 80h function not implemented 81h Vdisk was detected 82h an A20 error occurred 8Eh a general driver error 8Fh unrecoverable driver error 90h HMA does not exist 91h HMA is already in use 92h DX is less than the /HMAMIN= parameter 93h HMA is not allocated 94h A20 line still enabled A0h all extended memory is allocated A1h all available extended memory handles are allocated A2h invalid handle A3h source handle is invalid A4h source offset is invalid A5h destination handle is invalid A6h destination offset is invalid A7h length is invalid A8h move has an invalid overlap A9h parity error occurred AAh block is not locked ABh block is locked ACh block lock count overflowed ADh lock failed B0h only a smaller UMB is available B1h no UMB's are available B2h UMB segment number is invalid Format of EMM structure: Offset Size Description 00h DWORD number of bytes to move (must be even) 04h WORD source handle 06h DWORD offset into source block 0Ah WORD destination handle 0Ch DWORD offset into destination block Notes: if source and destination overlap, only forward moves (source base less than destination base) are guaranteed to work properly if either handle is zero, the corresponding offset is interpreted as a real-mode address referring to memory directly addressable by the processor Format of XMS handle info [array]: Offset Size Description 00h BYTE handle 01h BYTE lock count 02h DWORD handle size 06h DWORD handle physical address (only valid if lock count nonzero) --------m-2F4320----------------------------- INT 2F U - HIMEM.SYS - Mach 20 SUPPORT AX = 4320h ??? Return: ??? --------m-2F4330----------------------------- INT 2F UC - HIMEM.SYS v2.77+ - GET EXTERNAL A20 HANDLER ADDRESS AX = 4330h Return: AL = 80h if external A20 handler provided ES:BX -> external A20 handler CL = ??? Note: HIMEM.SYS calls this function to allow an external program to provide an A20 handler (i.e. to support a machine not supported by HIMEM itself) External A20 handler called with: AX = function 0000h disable A20 0001h enable A20 Return: AX = status 0000h failure 0001h successful SeeAlso: AX=4308h,AX=4310h --------E-2F43E0----------------------------- INT 2F - Novell DOS Protected Mode Services (DPMS) - INSTALLATION CHECK AX = 43E0h Return: AX = 0000h if installed ES:BX -> registration structure (see below) Note: this specification is still in beta SeeAlso: INT 2F/AX=1687h Format of registration structure: Offset Size Description 00h DWORD real-mode API entry point 04h DWORD 16-bit protected-mode API entry point 08h 8 BYTEs reserved (0) 10h 8 BYTEs blank-padded server OEM name 18h WORD flags bit 0: fast processor reset available (286 only) bits 1-15 reserved (undefined) 1Ah 2 BYTEs DPMS version (major,minor) 1Ch BYTE CPU type (02h = 286, 03h = 386 or higher) Call DPMS entry point with: AX = 0100h call protected-mode procedure CX = number of words of stack to copy ES:DI -> callup/down register structure (see below) Return: CF clear if successful CF set on error AX = error code (see below) AX = 0101h call real-mode procedure (RETF return) CX = number of words of stack to copy ES:DI -> callup/down register structure (see below) Return: CF clear if successful CF set on error AX = error code (see below) AX = 0102h call real-mode procedure (IRET return) CX = number of words of stack to copy ES:DI -> callup/down register structure (see below) Return: CF clear if successful CF set on error AX = error code (see below) AX = 0103h call real-mode interrupt handler BL = interrupt number CX = number of words of stack to copy ES:DI -> callup/down register structure (see below) Return: CF clear if successful CF set on error AX = error code (see below) AX = 0200h allocate descriptors CX = number of descriptors to allocate Return: CF clear if successful AX = first descriptor allocated CF set on error AX = error code (see below) AX = 0201h free a descriptor BX = descriptor Return: CF clear if successful CF set on error AX = error code (see below) AX = 0202h create alias descriptor BX = descriptor Return: CF clear if successful AX = alias descriptor CF set on error AX = error code (see below) AX = 0203h build alias to real-mode segment BX = descriptor CX = real-mode segment Return: CF clear if successful CF set on error AX = error code (see below) AX = 0204h set descriptor base BX = descriptor CX:DX = base address Return: CF clear if successful CF set on error AX = error code (see below) AX = 0205h set descriptor limit BX = descriptor CX = limit Return: CF clear if successful CF set on error AX = error code (see below) AX = 0206h set descriptor type/attribute BX = descriptor CL = type CH = attribute Return: CF clear if successful CF set on error AX = error code (see below) AX = 0207h get descriptor base BX = descriptor Return: CF clear if successful CX:DX = base address CF set on error AX = error code (see below) AX = 0300h get size of largest free block of memory Return: CF clear if successful BX:CX = size CF set on error AX = error code (see below) AX = 0301h allocate block of extended memory BX:CX = size Return: CF clear if successful BX:CX = base address SI:DI = handle CF set on error AX = error code (see below) AX = 0302h free block of extended memory SI:DI = handle Return: CF clear if successful CF set on error AX = error code (see below) AX = 0303h map linear memory ES:[DI] = DDS Return: CF clear if successful BX:CX = base address SI:DI = handle CF set on error AX = error code (see below) AX = 0304h unmap linear memory SI:DI = handle Return: CF clear if successful CF set on error AX = error code (see below) AX = 0400h relocate segment to extended memory ES:SI = base address CX = limit BL = type BH = attribute DX = selector or 0000h Return: CF clear if successful AX = selector BX:CX = new base address SI:DI = handle CF set on error AX = error code (see below) Values for error code: 8000h general error 8001h unsupported function 8011h descriptor unavailable 8012h linear memory unavailable 8013h physical memory unavailable 8021h invalid value 8022h invalid selector 8023h invalid handle Format of callup/down register structure: Offset Size Description 00h DWORD EDI 04h DWORD ESI 08h DWORD EBP 0Ch 4 BYTEs reserved (0) 10h DWORD EBX 14h DWORD EDX 18h DWORD ECX 20h DWORD EAX 24h DWORD EIP 28h WORD CS 2Ah 2 BYTEs reserved (0) 2Ch DWORD EFLAGS 30h DWORD ESP 34h WORD SS 36h 2 BYTEs reserved (0) 38h WORD ES 3Ah 2 BYTEs reserved (0) 3Ch WORD DS 3Eh 2 BYTEs reserved (0) 40h WORD FS 42h 2 BYTEs reserved (0) 44h WORD GS 46h 2 BYTEs reserved (0) --------E-2F44------------------------------- INT 2F U - DOS Extender support??? AH = 44h AL = function (at least 0Bh, 15h, 17h) ??? Return: ??? Note: called by Codeview for Windows SeeAlso: AH=86h --------G-2F4500----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - INSTALLATION CHECK AX = 4500h Return: AL = 01h if PROF.COM installed AL = 02h if VPROD.386 installed SeeAlso: AX=4501h,AX=4502h --------G-2F4501----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SETUP PROFILER AX = 4501h BX = CSIPS buffer size in KB (first parameter for ProfSetup) CX = output limit in KB (second parameter for ProfSetup) Note: this call is not supported by PROF.COM SeeAlso: AX=4502h,AX=4503h --------G-2F4502----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SET SAMPLING RATE AX = 4502h BL = sampling rate for PROF.COM (0 < BL <= 13) (01h = 8192/s, 04h = 1024/s, 08h = 32/s, 0Dh = 1/s) CX = sampling rate for VPROD.386 Note: for PROF.COM, this programs the CMOS clock by setting BL+2 as the low four bits of CMOS register 0Ah. The interruption rate is 1 SHL (15 - BL) per second. SeeAlso: AX=4501h,AX=4503h --------G-2F4503----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - START PROFILING AX = 4503h Notes: Profiling is also turned on by the key combinations LeftShift + RightShift + Alt LeftShift + RightShift + Ctrl for PROF.COM, this call programs the CMOS clock by reading register 0Ch, and setting bit 6 of register 0Bh. It then makes sure that IRQ8 is unmasked SeeAlso: AX=4504h --------G-2F4504----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - STOP PROFILING AX = 4504h Notes: profiling is also turned off by the key combination LeftShift + RightShift for PROF.COM, this programs the CMOS clock by reading register 0Ch and clearing bit 6 of register 0Bh. It then masks IRQ8. SeeAlso: AX=4503h,AX=4505h,AX=4506h,AX=4507h --------G-2F4505----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - CLEAR PROFILING DATA AX = 4505h SeeAlso: AX=4503h,AX=4504h,AX=4506h --------G-2F4506----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFlush" AX = 4506h SeeAlso: AX=4505h,AX=4507h --------G-2F4507----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFinish" AX = 4507h Note: this call is essentially a "ProfStop" (AX=4504h) followed by "ProfFlush" (AX=4506h) SeeAlso: AX=4504h,AX=4505h,AX=4506h --------G-2F4508----------------------------- INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - ALTERNATE SEGDEBUG IFACE AX = 4508h BX = ordinal (or 0000h) CX = segment DX = instance (or 0000h) SI = type (or 0000h) ES:DI -> ASCIZ module name Notes: this call is an alternate entry to the profiler's SEGDEBUG interface, but only to function 0, for notifying the profiler of each new segment loaded. The SHOWHITS utility then examines the profiler's output files (CSIPS.DAT and SEGENTRY.DAT) in conjunction with symbol files to provide information in a useful form. this call does not have a corresponding Windows function SeeAlso: AX=4500h --------D-2F4601----------------------------- INT 2F U - DOS 5+ kernel - ??? AX = 4601h Return: ??? Note: copies the MCB following the caller's PSP memory block into DOS data segment SeeAlso: AX=4602h --------D-2F4602----------------------------- INT 2F U - DOS 5+ kernel - ??? AX = 4602h Return: ??? Note: copies previously copied MCB from DOS data segment into MCB following caller's PSP memory block SeeAlso: AX=4601h --------E-2F46------------------------------- INT 2F U - Windows/286 DOS Extender AH = 46h AL = subfunction (03h,04h) Return: ??? Note: these two subfunctions are called by MS Windows 3.0 --------v-2F4653CX0002----------------------- INT 2F - F-PROT v1.x only - F-LOCK.EXE AX = 4653h CX = 0002h BX = subfunction 0000h installation check Return: AX = FFFFh 0001h uninstall Return: AX,BX,ES destroyed 0002h disable (v1.08 and below only) 0003h enable (v1.08 and below only) Note: F-LOCK is part of the F-PROT virus/trojan protection package by Fridrik Skulason SeeAlso: AX=4653h/CX=0003h,AX=CA00h,INT 21/AX=4BEEh Index: installation check;F-LOCK|uninstall;F-LOCK --------v-2F4653CX0003----------------------- INT 2F - F-PROT v1.x only - F-XCHK.EXE AX = 4653h CX = 0003h BX = subfunction 0000h installation check Return: AX = FFFFh 0001h uninstall Return: AX,BX,ES destroyed Note: F-XCHK is part of the F-PROT virus/trojan protection package by Fridrik Skulason SeeAlso: AX=4653h/CX=0002h,AX=4653h/CX=0004h,AX=CA00h Index: installation check;F-XCHK|uninstall;F-XCHK --------v-2F4653CX0004----------------------- INT 2F - F-PROT v1.x only - F-POPUP.EXE AX = 4653h CX = 0004h BX = subfunction 0000h installation check Return: AX = FFFFh 0001h uninstall Return: AX,BX,ES destroyed 0002h disable (v1.08 and below only) display message (v1.14+) other registers: ??? 0003h enable (v1.08 and below only) display message (v1.14+) other registers: ??? Return: AX = key pressed by user Note: F-POPUP is part of the F-PROT virus/trojan protection package by Fridrik Skulason SeeAlso: AX=4653h/CX=0003h,AX=4653h/CX=0005h,AX=CA00h Index: installation check;F-POPUP|uninstall;F-POPUP --------v-2F4653CX0005----------------------- INT 2F - F-PROT v1.x only - F-DLOCK.EXE AX = 4653h CX = 0005h BX = subfunction 0000h installation check Return: AX = FFFFh 0001h uninstall Return: AX,BX,ES destroyed Note: F-DLOCK is part of the F-PROT virus/trojan protection package by Fridrik Skulason SeeAlso: AX=4653h/CX=0004h,AX=CA00h Index: installation check;F-DLOCK|uninstall;F-DLOCK --------W-2F4680----------------------------- INT 2F U - MS Windows v3.0 - INSTALLATION CHECK AX = 4680h Return: AX = 0000h MS Windows 3.0 running in real (/R) or standard (/S) mode, or DOS 5 DOSSHELL active nonzero no Windows, Windows prior to 3.0, or Windows3 in enhanced mode Note: Windows 3.1 finally provides an installation check which works in all modes (see AX=160Ah) SeeAlso: AX=1600h,AX=160Ah ----------2F47------------------------------- INT 2F U - ??? AH = 47h ??? Return: ??? Note: reportedly called by Microsoft BASIC Compiler v7.0 --------K-2F4800----------------------------- INT 2F - DOS 5+ DOSKEY - INSTALLATION CHECK AX = 4800h Return: AL = nonzero if installed (DOS 5.0 and 6.0 return AX=AA02h) ES = segment of DOSKEY resident portion Note: DOSKEY chains if AL is not 00h or 10h on entry SeeAlso: AX=4800h"PCED",AX=4810h --------K-2F4800----------------------------- INT 2F - PCED v2.1 - INSTALLATION CHECK AX = 4800h Return: AX = AACDh if installed ES = segment of PCED kernel (PCED has multiple code segments) Program: PCED v2.1 is a command line editor/history/macro facility by Cove Software. It is the commercial version of the freeware CED. Notes: DOSKEY also responds to this call if installed, returning AX=AA02h. unlike DOSKEY, PCED does *not* chain if AL contains an unsupported function code. It IRETs with all registers intact. --------K-2F4810----------------------------- INT 2F - DOS 5+ DOSKEY, PCED v2.1 - READ INPUT LINE FROM CONSOLE AX = 4810h DS:DX -> line buffer (see INT 21/AH=0Ah) Return: AX = 0000h if successful Notes: the first byte (length) of the buffer MUST be 80h, or DOSKEY chains to the previous handler; PCED allows sizes other than 80h if the user's input is a macro name, no text is placed in the buffer even though AX=0000h on return; the program must immediately issue this call again to retrieve the expansion of the macro. Similarly, if the user enters a special parameter such as $*, this call must be repeated to retrieve the expansion; on the second call, DOSKEY overwrites the macro name on the screen with its expansion. unlike DOSKEY, PCED expands all macros on the first call, so it is not necessary to make two calls; since the buffer is not empty on return, DOSKEY-aware programs will not make the second call DOSKEY chains if AL is not 00h or 10h on entry SeeAlso: AX=4800h,INT 21/AH=0Ah --------K-2F48C0----------------------------- INT 2F - PCED v2.1 - PCED API AX = 48C0h DX = API function code other registers as required by the specified function Return: CF clear if successful CF set on error AX = PCED error code other registers as appropriate for API function Program: PCED v2.1 is a command line editor/history/macro facility by Cove Software. It is the commercial version of the freeware CED. Note: the full API information is available from Cove Software SeeAlso: AX=4800h"PCED",AX=48C1h,AX=48C2h,AX=48C3h ----------2F48C1BL00------------------------- INT 2F - PCED/VSTACK - INSTALLATION CHECK AX = 48C1h BL = 00h Return: AX = 0000h if installed BX = VSTACK resident segment Program: VSTACK is a resident backscroll utility included as part of the PCED package Note: chains if BL <> 00h on entry SeeAlso: AX=48C0h,AX=48C2h ----------2F48C2BL00------------------------- INT 2F - PCED/ATTRIB - INSTALLATION CHECK AX = 48C2h BL = 00h Return: AX = 0000h if installed BX = ATTRIB resident segment Program: ATTRIB is a resident file attribute changer included as part of the PCED package Note: chains if BL <> 00h on entry SeeAlso: AX=48C0h,AX=48C1h,AX=48C3h --------K-2F48C3BL00------------------------- INT 2F - PCED/KEYDEF - INSTALLATION CHECK AX = 48C3h BL = 00h Return: AX = 0000h if installed BX = KEYDEF resident segment Program: KEYDEF is a resident keyboard redefinition utility included as part of the PCED package Note: chains if BL <> 00h on entry SeeAlso: AX=48C0h,AX=48C2h,AX=48C4h ----------2F48C4BL00------------------------- INT 2F - PCED/FLIST - INSTALLATION CHECK AX = 48C4h BL = 00h Return: AX = 0000h if installed BX = FLIST resident segment Program: FLIST is a resident filelist processor included as part of the PCED package Note: chains if BL <> 00h on entry SeeAlso: AX=48C0h,AX=48C3h,AX=48C5h ----------2F48C4BL00------------------------- INT 2F - PCED/ASSOC - INSTALLATION CHECK AX = 48C4h BL = 00h Return: AX = 0000h if installed BX = ASSOC resident segment Program: ASSOC is a resident utility included as part of the PCED package which associated files with executable programs based on their extensions Note: chains if BL > 02h on entry SeeAlso: AX=48C0h,AX=48C4h,AX=48C5h/BL=01h,AX=48C5h/BL=02h ----------2F48C5BL01------------------------- INT 2F - PCED/ASSOC - VERSION CHECK AX = 48C5h BL = 01h Return: AX = 0000h if installed BX = binary ASSOC version (BL = major, BH = minor) Note: chains if BL > 02h on entry SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=02h ----------2F48C5BL02------------------------- INT 2F - PCED/ASSOC - ASSOCIATION TEST AX = 48C5h BL = 02h DS:SI -> ASCIZ filename Return: AX = status 0000h if filename is unknown 0001h if there is an association defined for the file BX destroyed Program: ASSOC is a resident utility included as part of the PCED package which associated files with executable programs based on their extensions Note: chains if BL > 02h on entry SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=01h ----------2F49------------------------------- INT 2F U - ??? AH = 49h ??? Return: ??? Note: reportedly called by DOS 5.0 installation --------D-2F4A00CX0000----------------------- INT 2F CU - DOS 5+ - FLOPPY-DISK LOGICAL DRIVE CHANGE NOTIFICATION AX = 4A00h CX = 0000h DH = new drive number DL = current drive number Return: CX = FFFFh to skip "Insert diskette for drive X:" message Note: called by MS-DOS 5.0+ IO.SYS just before displaying the message "Insert diskette for drive X:" on single-floppy systems --------D-2F4A01----------------------------- INT 2F - DOS 5+ - QUERY FREE HMA SPACE AX = 4A01h Return: BX = number of bytes available in HMA (0000h if DOS not using HMA) ES:DI -> start of available HMA area (FFFFh:FFFFh if not using HMA) Note: called by Windows 3.1 DOSX.EXE SeeAlso: AX=4310h,AX=4A02h --------D-2F4A02----------------------------- INT 2F - DOS 5+ - ALLOCATE HMA SPACE AX = 4A02h BX = number of bytes Return: ES:DI -> start of allocated HMA block or FFFFh:FFFFh BX = number of bytes actually allocated (rounded up to next paragraph for DOS 5.0 and 6.0) Notes: this call is not valid unless DOS is loaded in the HMA (DOS=HIGH) called by Windows 3.1 DOSX.EXE SeeAlso: AX=4A01h --------T-2F4A05----------------------------- INT 2F U - DOS 5+ DOSSHELL - TASK SWITCHING API??? AX = 4A05h SI = function 0000h reset??? 0001h ??? ES:BP -> 80-byte buffer containing ??? 0002h ??? 0003h ??? 0004h ??? BL = ??? 0005h ??? 0006h get ??? Return: ES:SI -> ??? 0007h get ??? Return: AX = ??? 0008h get ??? Return: DX:AX -> ??? (internal control data of some kind) 0009h get ??? Return: ES:SI -> ??? (apparently identical to function 0006h) 000Ah ??? BL = length of buffer ES:BP -> buffer containing ??? 000Bh get ??? Return: AX = ??? 000Ch ??? BL = ??? Return: if BL nonzero on entry DX:AX -> ??? if BL = 00h on entry ES:SI -> ??? Notes: DOSSHELL chains to the previous handler if SI is not one of the values listed above the DOSSWAP.EXE module calls functions 03h,04h,05h,07h,08h,09h,0Ch the Windows 3.1 DSWAP.EXE and WSWAP.EXE task switchers use these calls SeeAlso: AX=4B01h --------D-2F4A06----------------------------- INT 2F CU - DOS 5+ - DOS SUPERVISOR "REBOOT PANEL" - ADJUST MEMORY SIZE AX = 4A06h DX = segment following last byte of conventional memory Return: DX = segment following last byte of memory available for use by DOS Desc: used to override the default memory size when booting diskless workstations Notes: called by MS-DOS 5+ IO.SYS startup code if the signature "RPL" is present three bytes beyond the INT 2F handler; this call overrides the value returned by INT 12 hooked by RPL code at the top of memory to protect itself from being overwritten; DOS builds a memory block with owner = 0008h and name "RPL" which must be freed by the RPL code when it is done SeeAlso: INT 12 --------N-2F4A07----------------------------- INT 2F U - RESERVED FOR PROTMAN SUPPORT AX = 4A07h ??? Return: ??? --------c-2F4A10BX0000----------------------- INT 2F - SMARTDRV v4.00+ - INSTALLATION CHECK AND HIT RATIOS AX = 4A10h BX = 0000h CX = EBABh (v4.1+; see Note) Return: AX = BABEh if installed DX:BX = cache hits DI:SI = cache misses CX = ??? BP = version in BCD (4.10 = 0410h) Notes: most of the SMARTDRV API, including this call, is supported by PC-Cache v8.0 if DBLSPACE.BIN is installed but SMARTDRV has not yet been installed, unless CX=EBABh on entry, DBLSPACE.BIN displays the error message "Cannot run SMARTDrive 4.0 with DoubleSpace" and aborts the caller with INT 21/AX=4C00h SMARTDRV v3.x had a completely different API using IOCTL calls SeeAlso: AX=4A10h/BX=0001h,AX=4A10h/BX=0004h,AX=4A10h/BX=0005h SeeAlso: AX=4A10h/BX=0007h,AX=4A10h/BX=1234h,AX=4A11h/BX=0000h SeeAlso: INT 21/AX=4402h"SMARTDRV",INT 21/AX=4403h"SMARTDRV" --------c-2F4A10BX0001----------------------- INT 2F - SMARTDRV v4.00+ - FLUSH BUFFERS AX = 4A10h BX = 0001h Note: this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0002h --------c-2F4A10BX0002----------------------- INT 2F - SMARTDRV v4.00+ - RESET CACHE AX = 4A10h BX = 0002h Note: this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0001h --------c-2F4A10BX0003----------------------- INT 2F - SMARTDRV v4.00+ - STATUS AX = 4A10h BX = 0003h BP = drive # (0=A, 1=B, etc.) DL = subfunction 00h only get information 01h turn on read cache 02h turn off read cache 03h turn on write cache 04h turn off write cache Return: AX = BABEh if OK DL = status bit 7 not cached bit 6 write-through (not write-cached) bit 5 ??? bits 0-4 drive # (0=A, 1=B...) DL = FFh if drive does not exist Notes: If the read cache is off, reads will not be cached, but writes will continue to be cached if the write-cache is enabled. this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h --------c-2F4A10BX0004----------------------- INT 2F - SMARTDRV v4.00+ - GET CACHE SIZE AX = 4A10h BX = 0004h Return: AX = current size in elements??? BX = largest number of elements CX = size of elements in bytes DX = number of elements under Windows Note: this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0005h --------c-2F4A10BX0005----------------------- INT 2F - SMARTDRV v4.00+ - GET DOUBLE-BUFFER STATUS AX = 4A10h BX = 0005h BP = drive # (0=A, 1=B...) Return: AX = BABEh if double-buffered ES:DI -> ??? SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0006h --------c-2F4A10BX0006----------------------- INT 2F CU - SMARTDRV v4.00+ - CHECK IF DRIVE CACHEABLE AX = 4A10h BX = 0006h CL = drive number (01h = A:) Return: AX = 0006h if drive should not be cached by SMARTDRV Note: called by SMARTDRV at startup to determine whether it should cache a particular drive SeeAlso: AX=4A10h/BX=0000h --------c-2F4A10BX0007----------------------- INT 2F - SMARTDRV v4.00+ - GET DEVICE DRIVER FOR DRIVE AX = 4A10h BX = 0007h BP = drive number Return: DL = ??? ES:DI -> device driver header for drive Note: this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h,AX=4A11h/BX=0003h,AX=4A11h/BX=0004h --------c-2F4A10BX0008----------------------- INT 2F - SMARTDRV v4.20+ - GET/SET FLUSH BEFORE PROMPT, CD-ROM SUPPORT AX = 4A10h BX = 0008h DL = subfunction 00h set DH = new states bit 0: flush before prompt bits 1-7 reserved 01h get Return: DH = status flags bit 0: (v4.2+) flush before prompt bit 1: (v5.0+) CD-ROM caching support installed Note: v4.2 was an interim release to fix problems in the SMARTDRV included with MS-DOS 6.00; v5.00 is included with MS-DOS 6.2 --------c-2F4A10BX000A----------------------- INT 2F - SMARTDRV v4.00+ - GET TABLE POINTER??? AX = 4A10h BX = 000Ah Return: ES:BX -> table of about 10 bytes or 5 words. Seems to be words pointing to memory addresses containing info??? (see below) Note: this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h Format of data table: Offset Size Description 00h 8 BYTEs ??? 08h WORD offset of WORD containing number of elements in cache --------c-2F4A10BX1234----------------------- INT 2F - SMARTDRV v4.00+ - SIGNAL SERIOUS ERROR AX = 4A10h BX = 1234h Desc: pops up a message box saying that a serious error occurred and to hit R to retry. Note: this function is also supported by PC-Cache v8.0. SeeAlso: AX=4A10h/BX=0000h --------d-2F4A11BX0000----------------------- INT 2F - DBLSPACE.BIN - "GetVersion" - INSTALLATION CHECK AX = 4A11h BX = 0000h Return: AX = 0000h (successful) BX = 444Dh ("DM") CL = first drive letter used by DBLSPACE (0=A:) CH = number of drive letters used by DBLSPACE DX = internal DBLSPACE.BIN version number (bits 14-0) bit 15 set if DBLSPACE.BIN has not yet been relocated to final position in memory (i.e. DBLSPACE.SYS /MOVE) Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the disk-compression software bundled with MS-DOS 6.0 SeeAlso: AX=4A11h/BX=0001h,AX=4A11h/BX=0002h,AX=4A11h/BX=0003h SeeAlso: AX=4A11h/BX=0005h,AX=4A11h/BX=0007h,AX=4A11h/BX=FFFFh SeeAlso: INT 21/AX=4404h"DBLSPACE" --------d-2F4A11BX0001----------------------- INT 2F - DBLSPACE.BIN - "GetDriveMapping" - GET DRIVE MAPPING AX = 4A11h BX = 0001h DL = drive number (0=A:) Return: AX = status (see also below) 0000h successful BL = host drive (bit 7 set if specified drive is compressed) BH = DoubleSpace sequence number other error code (0101h) (see below) Note: the compressed volume file for the specified compressed drive is host:\DBLSPACE.sequence SeeAlso: AX=4A11h/BX=0000h Values for status: 0000h successful 0100h bad function 0101h invalid drive 0102h not a compressed drive 0103h drive already swapped 0104h drive not swapped --------d-2F4A11BX0002----------------------- INT 2F - DBLSPACE.BIN - "Swap Drive" - SWAP DRIVE LETTERS OF CVF AND HOST DRIVE AX = 4A11h BX = 0002h DL = drive number (0=A:) of compressed drive to swap with its host Return: AX = status (0000h,0101h,0102h,0103h) (see AX=4A11h/BX=0001h) Note: this function is intended for use by DBLSPACE.EXE only SeeAlso: AX=4A11h/BX=0000h --------d-2F4A11BX0003----------------------- INT 2F - DBLSPACE.BIN - "DSGetEntryPoints" - GET DEVICE DRIVER ENTRY POINTS AX = 4A11h BX = 0003h CL = drive number (0=A:) of compressed drive Return: CL = FFh on error (not compressed drive) = other driver unit number of host drive ES:SI -> device driver's strategy routine ES:DI -> device driver's interrupt routine BX destroyed Note: in conjunction with subfunction 0004h, this call allows disk caches like SMARTDRV to apply a device driver wrapper to DoubleSpaced drives just like SMARTDRV applies to regular block devices SeeAlso: AX=4A10h/BX=0007h,AX=4A11h/BX=0000h,AX=4A11h/BX=0004h --------d-2F4A11BX0004----------------------- INT 2F - DBLSPACE.BIN - "DSSetEntryPoints" - SET DEVICE DRIVER ENTRY POINTS AX = 4A11h BX = 0004h CL = drive number (0=A:) of compressed drive DL = unit number for new driver entry points DH = 00h ES:SI -> device driver strategy routine to call for drive ES:DI -> device driver interrupt routine to call for drive Return: CL = FFh on error (not a compressed drive) BX destroyed Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the disk-compression software bundled with MS-DOS 6.0 Note: in conjunction with subfunction 0003h, this call allows disk caches like SMARTDRV to apply a device driver wrapper to DoubleSpaced drives just like SMARTDRV applies to regular block devices SeeAlso: AX=4A10h/BX=0007h,AX=4A11h/BX=0000h,AX=4A11h/BX=0003h --------d-2F4A11BX0005----------------------- INT 2F - DBLSPACE.BIN - "ActivateDrive" - MOUNT COMPRESSED DRIVE AX = 4A11h BX = 0005h DL = drive number (0=A:) to assign to new drive ES:SI -> activation record (see below) Return: status returned in activation record (see below) SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0006h Format of activation record: Offset Size Description 00h 2 BYTEs signature "MD" (4Dh 44h) 02h BYTE 4Dh ('M') mount command 03h BYTE error code (set to FFh before calling) 00h successful 01h drive letter not available for DoubleSpace 02h drive letter already in use 03h no more disk units (increase MaxRemovableDrives in .INI) 09h CVF too fragmented 04h BYTE host drive number (0=A:) 05h ??? DISK_UNIT structure (not documented) --------d-2F4A11BX0006----------------------- INT 2F - DBLSPACE.BIN - "DeactivateDrive" - UNMOUNT COMPRESSED DRIVE AX = 4A11h BX = 0006h DL = drive number (0=A:) to unmount Return: AX = status (0000h,0102h) (see AX=4A11h/BX=0001h) SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0005h --------d-2F4A11BX0007----------------------- INT 2F - DBLSPACE.BIN - "GetDriveSpace" - GET SPACE AVAIL ON COMPRESSED DRIVE AX = 4A11h BX = 0007h DL = compressed drive number (0=A:) Return: AX = status (0000h,0102h) (see also AX=4A11h/BX=0001h) 0000h successful DS:SI -> free space record (see below) Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the disk-compression software bundled with MS-DOS 6.0 SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h Format of free space record: Offset Size Description 00h DWORD total number of sectors in drive's sector heap 04h DWORD number of free sectors in drive's sector heap --------d-2F4A11BX0008----------------------- INT 2F - DBLSPACE.BIN - "GetFileFragmentSpace" - GET SIZE OF FRAGMENT HEAP AX = 4A11h BX = 0008h DL = compressed drive number (0=A:) Return: AX = status (0000h,0102h) (see also AX=4A11h/BX=0001h) 0000h successful BX = maximum entries in File Fragment heap CX = available entries in File Fragment heap SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0007h,AX=4A11h/BX=0009h --------d-2F4A11BX0009----------------------- INT 2F - DBLSPACE.BIN - "GetExtraInfo" - DETERMINE NUMBER OF DISK_UNIT STRUCTS AX = 4A11h BX = 0009h DL = compressed drive number (0=A:) Return: AX = status (see also AX=4A11h/BX=0001h) 0000h successful CL = number of DISK_UNIT structures allocated (see AX=4A11h/BX=0005h) SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h --------d-2F4A11BXFFFE----------------------- INT 2F U - DBLSPACE.BIN - RELOCATE AX = 4A11h BX = FFFEh ES = segment to which to relocate DBLSPACE.BIN Return: ??? Notes: called by DBLSPACE.SYS to relocate DBLSPACE.BIN to its final position in memory this function also unhooks and discards the code providing this function and AX=4A11h/BX=FFFFh SeeAlso: AX=4A11h/BX=FFFFh --------d-2F4A11BXFFFF----------------------- INT 2F U - DBLSPACE.BIN - GET RELOCATION SIZE AX = 4A11h BX = FFFFh Return: AX = number of paragraphs needed by DBLSPACE.BIN Note: used by DBLSPACE.SYS to relocate the DBLSPACE driver to its final position in memory SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=FFFEh --------d-2F4A12CX4D52----------------------- INT 2F - Microsoft Realtime Compression Interface (MRCI) - RAM-BASED SERVER AX = 4A12h CX = 4D52h ("MR") DX = 4349h ("CI") Return: CX = 4943h ("IC") if installed DX = 524Dh ("RM") if installed ES:DI -> MRCINFO structure (see INT 1A/AX=B001h) Note: this call is functionally identical to INT 1A/AX=B001h, but should be called first, as the latter call is used for the first, ROM-based MRCI server, while this call is used for RAM-based servers which may be partially or entirely replacing a prior server SeeAlso: INT 1A/AX=B001h --------d-2F4A13----------------------------- INT 2F U - DBLSPACE.BIN - GET ??? ENTRY POINTS AX = 4A13h Return: AX = 134Ah if supported ES:BX -> entry point record (see below) SeeAlso: AX=4A11h/BX=0000h Format of entry point record: Offset Size Description 00h DWORD pointer to FAR function for ??? 04h 5 BYTEs FAR JUMP instruction to ??? --------N-2F4B------------------------------- INT 2F - LAN Manager 2.0 DOS Enh NETWKSTA.EXE - NETWORK WORKSTATION REDIRECTOR AH = 4Bh ??? Return: ??? Note: LAN Manager enhanced mode adds features beyond the standard redirector file/printer services SeeAlso: AX=118Ah,AX=4100h,AH=42h --------T-2F4B01----------------------------- INT 2F C - DOS 5+ TASK SWITCHER - BUILD CALLOUT CHAIN AX = 4B01h CX:DX -> task switcher entry point (see AX=4B02h) ES:BX = 0000h:0000h Return: ES:BX -> callback info structure (see below) or 0000h:0000h Notes: called by the task switcher this function is hooked by clients which require notification of task switcher activities; the call must first be passed on to the prior handler with registers unchanged using a simulated interrupt. On return, the client must build a callback info structure and store the returned ES:BX in the "next" field, then return the address of its own callback info structure. a client program must add itself to the notification chain if it provides services to other programs; before terminating, it must remove itself from the chain by calling the task switcher's entry point with AX=0005h (see AX=4B02h) the task switcher entry point should not be saved, as it is subject to change and will be provided on any notification call the Windows 3.1 Standard Mode supports this API SeeAlso: AX=160Bh,AX=4B02h Format of callback info structure: Offset Size Description 00h DWORD pointer to next callback info structure 04h DWORD pointer to notification function (see below) 08h DWORD reserved 0Ch DWORD address of zero-terminated list of API info structures (see AX=4B02h) Notification function is called with: AX = function 0000h switcher initialization Return: AX = 0000h if OK to load = nonzero to abort task switcher 0001h query suspend BX = session ID Return: AX = 0000h if OK to switch session = 0001h if not 0002h suspend session BX = session ID interrupts disabled Return: AX = 0000h if OK to switch session = 0001h if not 0003h activate session BX = session ID CX = session status flags bit 0: set if first activation of session bits 1-15: reserved (0) interrupts disabled Return: AX = 0000h 0004h session active BX = session ID CX = session status flags bit 0: set if first activation of session bits 1-15: reserved (0) Return: AX = 0000h 0005h create session BX = session ID Return: AX = 0000h if OK to create session = 0001h if not 0006h destroy session BX = session ID Return: AX = 0000h 0007h switcher termination BX = flags bit 0: set if calling switcher is only switcher loaded bits 1-15: reserved (0) Return: AX = 0000h ES:DI -> task switcher entry point (see AX=4B02h) Notes: function 0000h is generally called by the program which controls or invokes the task switcher, rather than by the task switcher itself; the entry point supplied to this function is not necessarily the entry point to the task switcher itself, and may be 0000h:0000h. If any client indicates that loading is not possible, all clients will be called with function 0007h; thus it is possible for a client to receive a termination notice without a corresponding initialization notice. except for functions 0002h and 0003h, the notification handler is called with interrupts enabled and may make any INT 21h function call; interrupts must not be enabled in functions 0002h and 0003h function 0007h may be called with ES:DI = 0000h:0000h if the entry point is no longer valid --------T-2F4B02BX0000----------------------- INT 2F - DOS 5+ TASK SWITCHER - INSTALLATION CHECK AX = 4B02h BX = 0000h ES:DI = 0000h:0000h Return: ES:DI = 0000h:0000h if task switcher not loaded ES:DI -> task switcher entry point (see below) if loaded AX = 0000h Notes: the returned entry point is that for the most-recently loaded task switcher; the entry points for prior task switchers may be determined with the "get version" call (see below) this function is supported by PC Tools v8+ CPTASK SeeAlso: AX=4A05h,AX=4B03h Call task switcher entry point with: AX = 0000h get version Return: CF clear if successful AX = 0000h ES:BX -> task switcher version struct (see below) CF set if unsupported function AX = 0001h test memory region ES:DI -> first byte to be tested CX = size of region to test Return: CF clear if successful AX = memory type of tested region 0000h global 0001h global and local 0002h local (replaced on session switch) CF set if unsupported function AX = 0002h suspend switcher ES:DI -> new task switcher's entry point Return: CF clear if successful AX = state 0000h switcher has been suspended 0001h switcher not suspended, new switcher must abort 0002h switcher not suspended, but new switcher may run anyway CF set if unsupported function AX = 0003h resume switcher ES:DI -> new task switcher's entry point Return: CF clear if successful AX = 0000h CF set if unsupported function AX = 0004h hook notification chain ES:DI -> callback info structure to be added to chain (see AX=4B01h) Return: CF clear if successful AX = 0000h CF set if unsupported function AX = 0005h unhook notification chain ES:DI -> callback info structure to be removed from chain (see AX=4B01h) Return: CF clear if successful AX = 0000h CF set if unsupported function AX = 0006h query API support BX = asynchronous API identifier Return: CF clear if successful AX = 0000h ES:BX -> API info structure (see below) for the client which provides the highest level of CF set if unsupported function Format of task switcher version structure: Offset Size Description 00h WORD major version of supported protocol (current protocol is 1.0) 02h WORD minor version of supported protocol 04h WORD major version of task switcher 06h WORD minor version of task switcher 08h WORD task switcher ID (see AX=4B03h) 0Ah WORD operation flags bit 0: set if task switcher disabled bits 1-15: reserved (0) 0Ch DWORD pointer to ASCIZ task switcher name ("MS-DOS Shell Task Switcher" for DOSSHELL task switcher) 10h DWORD pointer to previous task switcher's entry point or 0000h:0000h Format of API info structure: Offset Size Description 00h WORD size of structure in bytes (000Ah) 02h WORD API identifier 0001h NetBIOS 0002h 802.2 0003h TCP/IP 0004h LAN Manager named pipes 0005h Novell NetWare IPX 04h WORD major version \ of highest version of API for which the support 06h WORD minor version / level specified in the next field is provided 08h WORD support level 0001h minimal support 0002h API-level support 0003h switcher compatibility 0004h seamless compatibility --------T-2F4B03----------------------------- INT 2F - DOS 5+ TASK SWITCHER - ALLOCATE SWITCHER ID AX = 4B03h ES:DI -> task switcher entry point (see AX=4B02h) Return: AX = 0000h BX = switcher ID (0001h-000Fh), or 0000h if no more available Notes: if a task switcher has determined that it is the first to be loaded, it must allocate an identifier for itself and provide this function to all subsequent task switchers; if it is not the first to be loaded, it must call this function to allocate an ID. The switcher ID is used as the high four bits of all session identifiers to ensure unique session IDs. if no more switcher IDs are available, the new task switcher making the call must terminate or disable itself the task switcher providing the identifiers may call the new task switcher's entry point as needed this call is available from within DOSSHELL even if the task switcher is not installed this function is supported by PC Tools v8+ CPTASK, but appears to always return an ID of 0000h SeeAlso: AX=4B02h,AX=4B04h --------T-2F4B04----------------------------- INT 2F - DOS 5+ TASK SWITCHER - FREE SWITCHER ID AX = 4B04h BX = switcher ID ES:DI -> task switcher entry point (see AX=4B02h) Return: AX = 0000h BX = status 0000h successful other error (invalid ID or ID not allocated) Notes: called by a task switcher when it exits, unless it was the first loaded and is providing the support for AX=4B03h and AX=4B04h the task switcher providing the identifiers may call the terminating task switcher's entry point as needed this call is available from within DOSSHELL even if the task switcher is not installed this call is supported by PC Tools v8+ CPTASK, but appears to return sucessfully no matter which ID is given SeeAlso: AX=4B02h,AX=4B03h --------T-2F4B05----------------------------- INT 2F C - DOS 5+ TASK SWITCHER - IDENTIFY INSTANCE DATA AX = 4B05h ES:BX = 0000h:0000h CX:DX -> task switcher entry point (see AX=4B02h) Return: ES:BX -> startup info structure (see below) or 0000h:0000h Notes: called by task switcher clients with instance data should hook this call, pass it through to the previous handler with unchanged registers using a simulated interrupt. On return, the client should create a startup info structure (see below), store the returned ES:BX in the "next" field, and return the address of the created structure in ES:BX all MS-DOS function calls are available from within this call SeeAlso: AX=1605h,AX=160Bh,AX=4B02h Format of startup info structure: Offset Size Description 00h 2 BYTEs major, minor version of info structure (03h,00h) 02h DWORD pointer to next startup info structure or 0000h:0000h 06h DWORD 0000h:0000h (ignored) 0Ah DWORD ignored 0Eh DWORD pointer to instance data records Format of one instance data record in array: Offset Size Description 00h DWORD address of instance data (end of array if 0000h:0000h) 04h WORD size of instance data --------W-2F4B20----------------------------- INT 2F - MS Windows 3 - WIN.COM - SET PROGRAM TO EXECUTE ON EXIT AX = 4B20h Return: AX = 0000h if successful DX:CX -> 256-byte buffer for pathname and commandline (see below) Note: when the Windows function ExitWindows is called with an exit code of 44h, WIN.COM executes the program specified in the returned buffer and then restarts Windows Format of buffer: Offset Size Description 00h 128 BYTEs ASCIZ pathname of program to execute 80h 128 BYTEs commandline for program --------p-2F4C------------------------------- INT 2F U - Advanced Power Management AH = 4Ch AL = function 00h version check 01h suspend system requested FFh suspend/resume battery notification ??? Return: ??? ----------2F4D------------------------------- INT 2F U - ??? AH = 4Dh ??? Return: ??? Note: reportedly called by Kana Kanji Converter and MSKK --------N-2F4E53BL00------------------------- INT 2F - SilverNET v2+ - INSTALLATION CHECK AX = 4E53h ("NS") BL = 00h (function "installation check") BH = module ID (see below) Return: AX = 0000h if specified module installed BX = 4E53h if installed Program: SilverNET is an SMB-compatible peer-to-peer NOS for DOS or Windows systems, by Net-Source, Inc. of Santa Clara, CA. SeeAlso: AX=4E53h/BL=01h,AX=4E53h/BL=02h,AX=B800h,AX=B809h Values for module ID: 01h SilverCACHE 02h Workstation 03h NetBIOS 04h Peer 20h NS Share 80h NetWare help TSR --------N-2F4E53BL01------------------------- INT 2F - SilverNET - GET RUNTIME PARAMETER AX = 4E53h ("NS") BL = 01h (function "get runtime parameter") BH = module ID (see AX=4E53h/BL=00h) CX = parameter index (see below) Return: AX = WORD value at specified index Desc: retrieve a word of data from the specified SilverNET module Values for Peer parameter index (* = read-only): 00h * maximum outstanding SMB buffers 02h * maximum logged-in nodes 04h * number of shareable resources 06h * number of characters to print per time slice 08h * number of printers that can be shared 0Ah * number of nodes logged in 0Ch * number of files to allow opened 0Eh how fast to despool (/PSLICE) 10h audit flag 24h * far pointer to resource table (each resource is 96 bytes in length) 32h * far pointer to SFT (internal if SilverNET files > CONFIG.SYS files, else DOS SFT) 36h spool flag bit 0: LPT1 needs despooling bit 1: LPT2 needs despooling bit 2: LPT2 needs despooling bit 4: COM1 needs despooling bit 5: COM2 needs despooling bit 6: COM3 needs despooling Values for NS Share parameter index (* = read-only): 00h version number (high byte = minor, low byte = major) 10h * segment of first lock record (other records in consecutive paragraphs) (if PSP field = 0000h, lock record is free) 12h * maximum possible number of lock records 14h * starting segment of sharing buffer (NS Share's sharing records are identical to DOS SHARE except that fields which are normally offsets into SHARE are segment numbers) 18h * size of sharing buffer in paragraphs 1Ah * total free paragraphs in sharing buffer 1Ch * current number of shared files 1Eh * current number of locked records Values for Workstation parameter index (* = read-only): 00h version number (high byte = minor, low byte = major) 02h * size of each network buffer for file operations 04h * number of redirector file buffers 06h * size of each print cache buffer 08h * number of network LPT printers 0Ch flush time in ticks (idle time on network printer before flushing) 0Eh (16 WORDs) last active time for each printer 2Eh * stub segment if program split into two parts 60h receive name number for datagram listens 62h * 18-byte machine name 74h * LASTDRIVE (01h = A:, etc.) 7Ch row number of message box on screen 7Eh message time in clock ticks 82h * number of network adapters in use 84h station ID broadcast flag (never set on redirectors) 96h * NetBIOS names left 98h * NCBs left 9Ah * sessions left A2h * total number of network printers (LPT+COM) A4h * number of serial network printers A8h * segment containing file cache buffers AAh * segment containing print cache buffers ACh * bytes remaining free in HMA before program loaded AEh * start of free memory in HMA B2h * flag: using HMA --------N-2F4E53BL02------------------------- INT 2F - SilverNET - SET RUNTIME PARAMETERS AX = 4E53h ("NS") BL = 02h (function "set runtime parameters") BH = module ID (see AX=4E53h/BL=00h) CX = parameter index (see AX=4E53h/BL=01h) DX = new value for specified parameter Desc: set a WORD value in the specified SilverNET module Note: not all indexed parameters are writable; modifying a read-only parameter can result in system crashes SeeAlso: AX=4E53h/BL=00h,AX=4E53h/BL=01h --------p-2F53------------------------------- INT 2F U - POWER.EXE - APM event broadcasting??? AH = 53h AL = event??? 05h CPU idle 0Bh PM event broadcast API Return: ??? Note: called by MS Windows 3.1 POWER.DRV; hooked by MS Mouse driver v8.20+ and PC-Cache v8.0 SeeAlso: AX=530Bh,AH=54h,INT 33/AX=002Fh --------p-2F530B----------------------------- INT 2F U - ??? (MOUSEPWR.COM, others) - ??? AX = 530Bh BX = subfunction 0003h ??? 0004h ??? ??? Return: ??? Note: it appears that subfunction 0003h reads or restores the current mouse settings (the MS Mouse driver hooks AX=530Bh), and 0004h might be the converse --------p-2F5400----------------------------- INT 2F U - POWER.EXE - INSTALLATION CHECK AX = 5400h Return: AX = POWER.EXE version (AH = major, AL = minor) if installed BX = 504Dh ("PM") CF clear Note: called by MS Windows 3.1 POWER.DRV SeeAlso: AH=53h,AX=5401h,AX=5402h,AX=5481h,AX=5482h --------p-2F5401----------------------------- INT 2F U - POWER.EXE - GET/SET POWER STATUS AX = 5401h BX = function 0000h get status Return: BL = power management status bit 0: CPU idle bit 1: ??? ??? Return: AX = function status 0000h success else error code Note: called by MS Windows 3.1 POWER.DRV SeeAlso: AH=53h,AX=5400h,AX=5402h,AX=5403h --------p-2F5402----------------------------- INT 2F U - POWER.EXE - GET/SET IDLE DETECTION STRATEGY AX = 5402h BH = subfunction 00h get other set BL = detection strategy (00h-0Fh or FFh) Return: BX = current/new detection strategy SeeAlso: AH=53h,AX=5400h,AX=5401h,AX=5481h,AX=5482h --------p-2F5403----------------------------- INT 2F U - POWER.EXE - GET/SET ADVANCED POWER MANAGEMENT SETTING AX = 5403h BX = new power management setting or 0000h to get current setting Return: AX = status 0000h successful BX = power management setting (see below) other error code SeeAlso: AX=5401h,AX=5480h Values for power management setting: 0001h-0005h "min" 0006h "reg" 0007h-0008h "max" --------t-2F5453----------------------------- INT 2F - TesSeRact RAM-RESIDENT PROGRAM INTERFACE AX = 5453h BX = subfunction 00h installation check CX = 0000h DS:SI -> 8-char blank-padded name Return: AX = FFFFh installed CX = ID number of already-installed copy = anything else, not installed CX = ID number for TSR when installed 01h get user parameters CX = TSR ID number Return: AX = 0000h successful ES:BX -> user parameter block (see below) = nonzero failed 02h check if hotkey in use CL = scan code of hot key Return: AX = FFFFh hot key conflicts with another TSR otherwise safe to use the hotkey 03h replace default critical error handler CX = TSR ID number DS:SI -> new routine for INT 24h Return: AX = nonzero, unable to install new handler 04h get internal data area CX = TSR ID number Return: AX = 0000h ES:BX -> TSR's internal data area (see below) = nonzero, TSR not found 05h set multiple hot keys CX = TSR ID number DL = number of additional hot keys to allocate DS:SI -> table of hot keys BYTE hotkey scan code BYTE hotkey shift state BYTE flag value to pass to TSR (nonzero) Return: AX = nonzero, unable to install hot keys 06h - 0Fh reserved 10h enable TSR CX = TSR ID number Return: AX = nonzero, unable to enable 11h disable TSR CX = TSR ID number Return: AX = nonzero, unable to disable 12h unload TSR CX = TSR ID number Return: AX = nonzero, invalid TSR number Note: if any interrupts used by TSR have been grabbed by another TSR, the TesSeRact routines will wait until it is safe to remove the indicated TSR from memory 13h restart TSR CX = TSR ID number of TSR which was unloaded but is still in memory Return: AX = nonzero, unable to restart TSR 14h get status word CX = TSR ID number Return: AX = FFFFh invalid ID number = other, successful BX = bit flags 15h set status word CX = TSR ID number DX = new bit flags Return: AX = nonzero, unable to set status word 16h get INDOS state at popup CX = TSR ID number Return: AX = 0000h successful BX = value of INDOS flag 17h - 1Fh reserved 20h call user procedure CX = TSR ID number ES:DI -> user-defined data Return: AX = 0000h successful 21h stuff keystrokes into keyboard buffer CX = TSR ID number DL = speed 00h stuff keystrokes only when buffer is empty 01h stuff up to four keystrokes per clock tick 02h stuff up to 15 keystrokes per clock tick DH = scan code flag if zero, buffer contains alternating ASCII and scan codes if nonzero, buffer contains only ASCII codes SI = number of keystrokes ES:DI -> buffer to stuff Return: AX = 0000h success F0F0h user aborted with ^C or ^Break other unable to stuff keystrokes 22h (v1.10) trigger popup CX = TSR ID number Return: AX = 0000h success, TSR will either pop up or beep to indicate that it is unable to pop up nonzero invalid ID number 23h (v1.10) invoke TSR's background function CX = TSR ID number Return: AX = 0000h success FFFFh not safe to call background function nonzero invalid ID number 24h - 2Fh reserved Notes: Borland's THELP.COM popup help system for Turbo Pascal and Turbo C (versions 1.x and 2.x only) fully supports the TesSeRact API, as do the SWAP?? programs by Innovative Data Concepts. AVATAR.SYS supports functions 00h and 01h (only the first three fields of the user parameter block) using the name "AVATAR " SeeAlso: AX=CAFEh,INT 16/AX=55FFh,INT 2D"AMIS" Index: installation check;TesSeRact TSR interface|uninstall;TesSeRact Values for TesSeract names: "AVATAR " AVATAR.SYS "QeditTSR" TSR version of SemWare's Qedit editor "SCRNBLNK" Trusted Access screen blanker Format of User Parameter Block: Offset Size Description 00h 8 BYTEs blank-padded TSR name 08h WORD TSR ID number 0Ah DWORD bitmap of supported functions 0Eh BYTE scan code of primary hotkey 00h = pop up when shift states match FFh = no popup (if shift state also FFh) 0Fh BYTE shift state of primary hotkey FFh = no popup (if scan code also FFh) 10h BYTE number of secondary hotkeys 11h DWORD pointer to extra hotkeys set by func 05h 15h WORD current TSR status flags 17h WORD PSP segment of TSR 19h DWORD DTA for TSR 1Dh WORD default DS for TSR 1Fh DWORD stack at popup 23h DWORD stack at background invocation Index: hotkeys;TesSeRact TSR interface Format of TSR internal data area: Offset Size Description 00h BYTE revision level of TesSeRact library 01h BYTE type of popup in effect 02h BYTE INT 08 occurred since last invocation 03h BYTE INT 13 occurred since last invocation 04h BYTE active interrupts 05h BYTE active soft interrupts 06h BYTE DOS major version 07h BYTE how long to wait before popping up 08h DWORD pointer to INDOS flag 0CH DWORD pointer to DOS critical error flag 10h WORD PSP segment of interrupted program 12h WORD PSP segment of prog interrupted by INT 28 14h DWORD DTA of interrupted program 18h DWORD DTA of program interrupted by INT 28 1Ch WORD SS of interrupted program 1Eh WORD SP of interrupted program 20h WORD SS of program interrupted by INT 28 22h WORD SP of program interrupted by INT 28 24h DWORD INT 24 of interrupted program 28h 3 WORDs DOS 3+ extended error info 2Eh BYTE old BREAK setting 2Fh BYTE old VERIFY setting 30h BYTE were running MS WORD 4.0 before popup 31h BYTE MS WORD 4.0 special popup flag 32h BYTE enhanced keyboard call in use 33h BYTE delay for MS WORD 4.0 11 times (for INTs 08h,09h,13h,16h,1Ch,21h,28h,2Fh,1Bh,23h, and 24h): DWORD old interrupt vector BYTE interrupt number WORD offset in TesSeRact code segment of new interrupt handler --------p-2F5480----------------------------- INT 2F U - POWER.EXE - GET/SET ??? AX = 5480h BX = direction 0000h get other set CX = size of buffer (at least 0010h) DS:SI -> buffer Return: AX = status 0000h successful other error code SeeAlso: AX=5400h,AX=5481h,AX=548Fh --------p-2F5481----------------------------- INT 2F U - POWER.EXE - GET STATISTICS AX = 5481h BX = ??? (0000h or 0001h) CX = length of buffer DS:SI -> buffer for statistics (see below) Return: AX = status 0000h successful else error code SeeAlso: AH=53h,AX=5400h,AX=5480h,AX=5402h,AX=5482h Format of statistics: Offset Size Description 00h DWORD total ??? 04h DWORD ??? during which CPU was idle (divide by previous to get idle rate) --------p-2F5482----------------------------- INT 2F U - POWER.EXE - GET/SET APM POLLING FREQUENCY AX = 5482h BX = new polling frequency or 0000h to get current frequency Return: AX = 0000h (successful) BX = current frequency if BX=0000h on entry SeeAlso: AH=53h,AX=5400h,AX=5401h,AX=5480h,AX=5481h,AX=548Fh --------p-2F548F----------------------------- INT 2F U - POWER.EXE - GET/SET ??? AX = 548Fh BX = ??? or 0000h to get current ??? Return: AX = 0000h (successful) BX = current ??? CX = ??? SeeAlso: AX=5400h,AX=5480h,AX=5482h --------l-2F5500----------------------------- INT 2F U - DOS 5+ - COMMAND.COM INTERFACE AX = 5500h Return: AX = 0000h if an instance of COMMAND.COM is already running DS:SI -> entry point table Notes: used to access the shareable portion of COMMAND.COM, which may have been moved into the HMA; only the primary COMMAND.COM retains this portion procedures called from a dispatcher in COMMAND's resident portion; most assume that the segment address of the resident portion is on the stack and are thus not of general use SeeAlso: AX=5501h --------l-2F5501----------------------------- INT 2F U - DOS 5+ - ROM COMMAND.COM INTERFACE AX = 5501h Return: ??? Note: used to determine whether the caller is the first instance of ROM COMMAND.COM SeeAlso: AX=5500h --------R-2F5600DXFFFF----------------------- INT 2F - INTERLNK - INSTALLATION CHECK AX = 5600h DX = FFFFh BL = instance number (00h = any, 01h = first loaded, etc.) Return: AL = FFh if installed BL = instance number CX = ??? DX = resident CS SeeAlso: AX=5601h,AX=5602h --------R-2F5601DXFFFF----------------------- INT 2F - INTERLNK - CHECK IF REDIRECTED DRIVE AX = 5601h DX = FFFFh BH = drive number (0=A:) Return: (as for AL=00h if redirected drive) SeeAlso: AX=5600h --------R-2F5602DXFFFF----------------------- INT 2F - INTERLNK - GET ??? AX = 5602h DX = FFFFh Return: CX = ??? SeeAlso: AX=5600h ----------2F57------------------------------- INT 2F U - ??? AH = 57h ??? Return: ??? Note: reportedly used by Iomega Corp. --------v-2F6282----------------------------- INT 2F U - PC Tools v7.0+ VDEFEND, VSAFE, VWATCH, DATAMON - SET ??? ADDRESS AX = 6282h CX:DX -> ??? or 0000h:0000h DI = segment of ??? record (see below) or 0000h/FFFFh to ignore Return: BX = 0062h Note: if CX:DX = 0000h:0000h on entry, the ??? address is not changed (DATAMON only) SeeAlso: INT 13/AH=FAh"VSAFE",INT 21/AH=FAh"VDEFEND" Format of record: Offset Size Description 00h DWORD ??? 04h WORD offset of ??? in record's segment VSAFE 2.0 sets byte at +01h to 56h or 58h VWATCH 2.1 sets byte at +02h to 56h or 58h 06h 2 BYTEs ??? 08h BYTE ??? (01h/other) --------v-2F6284BX0000----------------------- INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - INSTALLATION CHECK AX = 6284h BX = 0000h CX = 0000h Return: AX = segment of resident code BX = 5555h CX = 5555h --------v-2F6284BX0001----------------------- INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - GET ??? AX = 6284h BX = 0001h CX = 0001h Return: AX:BX -> ??? data (see below) CX = BX Format of data for v9.0: Offset Size Description 00h 5 BYTEs ??? 05h WORD resident code segment (may be segment of DWORD at +03h) 07h DWORD -> FAR function to sound alert tone ??? --------v-2F6284BX0002----------------------- INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - GET OPTIONS AX = 6284h BX = 0002h CX = 0002h Return: AX = options (see below) BX = ??? (0000h for v9) CX = AX DX = BX Bitfields for options: bit 14 using Delete Tracker bit 13 using Delete Sentry bit 12 disabled bit 1 ??? --------v-2F6284BX0003----------------------- INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - SET ??? FLAGS AX = 6284h BX = 0003h CX = flags bit 12: disable DATAMON/DPROTECT bit 10: ??? bit 5: ??? bit 3: ??? DX = flags bit 15: ??? Note: v9 DPROTECT only checks bit 12 of CX, and ignores DX entirely --------v-2F6284BX0004----------------------- INT 2F U - PC Tools v8 DATAMON, v9+ DPROTECT - ??? AX = 6284h BX = 0004h CX = 0004h Return: AX = 5555h BX = ??? (0800h) CX = ??? (FCCCh for v8, FCCBh for v9) --------V-2F6400----------------------------- INT 2F - SCRNSAV2.COM - INSTALLATION CHECK AX = 6400h Return: AL = 00h not installed FFh installed Program: SCRNSAV2.COM is a screen saver for PS/2s with VGA by Alan Ballard SeeAlso: INT 10/AX=5555h Index: screen saver;SCRNSAV2 --------N-2F7000----------------------------- INT 2F - License Service API - INSTALLATION CHECK AX = 7000h CX = license server index (0000h to 001Fh) Return: AL = status 00h not installed FFh installed Notes: The License Service API is being maintained by Microsoft but is being supported by a large number of companies including Apple, Banyan, DEC, HP, Lotus, Microsoft, Novell, Software Publishers Association, and Wordperfect (not a complete list!) Each license service provider must search for the next free index slot to use SeeAlso: AX=7001h,AX=7003h,AX=7004h,AX=7005h --------N-2F7001----------------------------- INT 2F - License Service API - REQUEST LICENSE AX = 7001h CX = license server index (0000h to 001Fh) DS:DX -> SLSREQUEST structure (see below) Return: AX = status 0000h success else provider error code ES:BX = provider specific handle for the license context SeeAlso: AX=7002h,AX=7004h,AX=7005h Format of SLSREQUEST structure: Offset Size Description 00h DWORD (return) status code 04h DWORD (return) handle identifying context 08h DWORD (call) address of Publisher string 0Ch DWORD (call) address of Product string 10h DWORD (call) address of Version string 14h DWORD units required 18h DWORD address of comment string 1Ch DWORD address of SLSCHALLENGE structure (see below) Format of SLSCHALLENGE structure: Offset Size Description 00h DWORD algorithm (currently always 1) 04h DWORD secret to be challenged (1-255) 08h DWORD size of challenge in bytes (1-255) 0Ch N BYTEs challenge data --------N-2F7002----------------------------- INT 2F - License Service API - RELEASE LICENSE AX = 7002h CX = license server index (0000h to 001Fh) DS:DX -> SLSRELEASE structure (see below) ES:BX = provider specific handle for the license context Return: AL = status 00h not installed FFh installed SeeAlso: AX=7001h,AX=7005h Format of SLSRELEASE structure: Offset Size Description 00h DWORD handle indentifying license context 04h DWORD total units consumed 08h DWORD address of comment string --------N-2F7003----------------------------- INT 2F - License Service API - UPDATE AX = 7003h CX = license server index (0000h to 001Fh) DS:DX -> SLSUPDATE structure ES:BX = provider specific handle for the license context Return: AL = status 00h not installed FFh installed SeeAlso: AX=7004h,AX=7005h Format of SLSUPDATE structure: Offset Size Description 00h DWORD (return) status code 04h DWORD (call) handle identifying license context 08h DWORD (call) total units consumed 0Ch DWORD additional units required 10h DWORD address of comment string 14h DWORD address of SLSCHALLENGE structure (see AX=7001h) --------N-2F7004----------------------------- INT 2F - License Service API - GET ERROR AX = 7004h CX = license server index (0000h to 001Fh) DS:DX -> SLSGETERROR structure (see below) ES:BX = provider specific handle for the license context Return: AL = status 00h not installed FFh installed SeeAlso: AX=7000h,AX=7001h Format of SLSGETERROR structure: Offset Size Description 00h DWORD (return) status code 04h DWORD handle identifying license context 08h DWORD error code 0Ch DWORD buffer size in bytes 10h N BYTEs data buffer --------N-2F7005----------------------------- INT 2F - License Service API - QUERY LICENSE AX = 7005h CX = license server index (0000h to 001Fh) DS:DX -> SLSQUERY structure (see below) ES:BX = provider specific handle for the license context Return: AL = status 00h not installed FFh installed SeeAlso: AX=7001h,AX=7002h Format of SLSQUERY structure: Offset Size Description 00h DWORD (return) status code 04h DWORD handle identifying license context 08h DWORD information index 0Ch DWORD buffer size in bytes 10h N BYTEs data buffer --------d-2F7200----------------------------- INT 2F - SRDISK v1.30 - INSTALLATION CHECK AX = 7200h Return: AL = FFh if installed ES = segment of device driver header (see below) Program: SRDISK is a freeware resizeable RAMdisk by Marko Kohtala Format of device driver header: Offset Size Description 00h 10 BYTEs same as standard device driver header (see INT 21/AH=52h) 0Ah BYTE number of subunits (drives) supported by driver 0Bh 3 BYTEs signature "SRD" 0Eh 4 BYTEs memory type string (currently only "XMS ") 12h 4 BYTEs ASCII driver version string "N.NN" 16h BYTE 00h 17h BYTE configuration format version (currently 00h) 18h WORD offset of drive configuration data --------N-2F7A00----------------------------- INT 2F - Novell NetWare - LOW-LEVEL API (IPX) INSTALLATION CHECK AX = 7A00h Return: AL = 00h not installed = FFh installed ES:DI -> FAR entry point for routines accessed exclusively through INT 7A in NetWare versions through 2.0a. Call with same values as INT 7A SeeAlso: AX=7AFFh/BX=0000h,AX=D800h,INT 64"Novell",INT 7A"Novell" --------N-2F7A10----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - GET TBMI STATUS AX = 7A10h Return: DH = major TBMI version number DL = minor TBMI version number (01h for v1.1) CX = segment address of TBMI resident part BX = status word of TBMI (see below) Note: TBMI is the Task-Switched Buffer Manager Interface SeeAlso: AX=7A11h,AX=7A12h,AX=7A13h,AX=7A14h Bitfields for status word: bit 0 INT2F intercepted by TBMI bit 1 INT7A intercepted by TBMI bit 2 INT64 intercepted by TBMI bits 3-14 reserved or unused ??? bit 15 outstanding task ID was detected --------N-2F7A11----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - GET INT2F HANDLERS AX = 7A11h Return: ES:BX -> old INT 2F handler DS:DX -> TBMI INT 2F handler SeeAlso: AX=7A10h,AX=7A12h,AX=7A13h,AX=7A1Ah --------N-2F7A12----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - GET INT64 HANDLERS AX = 7A12h Return: ES:BX -> old INT 64 handler DS:DX -> TBMI INT 64 handler SeeAlso: AX=7A10h,AX=7A11h,AX=7A13h --------N-2F7A13----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - GET INT7A HANDLERS AX = 7A13h Return: ES:BX -> old INT 7A handler DS:DX -> TBMI INT 7A handler SeeAlso: AX=7A10h,AX=7A11h,AX=7A12h --------N-2F7A14----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - GET STATISTICS AX = 7A14h CX = statistic to retrieve 0000h available diagnostic functions??? Return: CX = maximum available function??? (000Ch for v2.0) 0001h buffers in use Return: CX = TBMI buffers currently in use 0002h maximum buffers used Return: CX = maximum number of buffers ever in use 0003h unavailable buffers Return: CX = count of unavailable TBMI buffers 0004h old interrupt usage Return: CX = TBMI accesses to intercepted old vectors INT 2F, INT 64, and INT 7A 0005h far call usage Return: CX = TBMI accesses to IPX/SPX far call handler (not including internal accesses) 0006h task buffering Return: CX = TBMI task buffering status (enabled/disabled or disable/enable switch count???) 0007h current task ID Return: CX = TBMI current task ID number (0000h if ???) 0008h outstanding ID count Return: CX = number of outstanding TBMI IDs 0009h configured ECBs Return: CX = number of TBMI Event Control Blocks configured 000Ah configured data ECBs Return: CX = number of TBMI data ECBs configured 000Bh configured sockets Return: CX = number of TBMI sockets configured (from NETCFG) 000Ch current sockets Return: CX = number of TBMI sockets currently in use Return: BX = maximum supported subfunction (000Ch) SeeAlso: AX=7A10h --------N-2F7A15----------------------------- INT 2F OU - Novell NetWare - TBMI v1.1 only - RESET ??? AX = 7A15h Return: BX = new value of ??? Desc: set ??? to its default value Note: this call is a NOP under TBMI v2.0 (TBMI2) SeeAlso: AX=7A17h --------N-2F7A16----------------------------- INT 2F OU - Novell NetWare - TBMI v1.1 only - ??? AX = 7A16h CX = ??? ??? Return: ??? Note: this call is a NOP under TBMI v2.0 (TBMI2) --------N-2F7A17----------------------------- INT 2F OU - Novell NetWare - TBMI v1.1 only - ??? AX = 7A17h ??? Return: BX = old value of ??? CX = new value of ??? Note: this call is a NOP under TBMI v2.0 (TBMI2) SeeAlso: AX=7A15h --------N-2F7A18----------------------------- INT 2F U - Novell NetWare - TASKID v1.0 - INSTALLATION CHECK AX = 7A18h Return: AL = FFh if installed BX = configuration flags (see below) CX = resident code segment SeeAlso: AX=7A10h Bitfields for configuration flags: bit 0 INT 2F hooked bit 3 INT 08 hooked other unused --------N-2F7A19----------------------------- INT 2F U - Novell NetWare - TASKID v1.0 - GET INT 08 HANDLERS AX = 7A19h Return: AL = FFh DS:DX -> TASKID INT 08 handler ES:BX -> original INT 08 handler --------N-2F7A1A----------------------------- INT 2F U - Novell NetWare - TASKID v1.0 - GET INT 2F HANDLERS AX = 7A1Ah Return: AL = FFh DX:DX -> TASKID INT 2F handler ES:BX -> original INT 2F handler SeeAlso: AX=7A11h,AX=7A19h --------N-2F7A1B----------------------------- INT 2F U - Novell NetWare - TASKID v1.0 - GET DIAGNOSTICS INFORMATION AX = 7A1Bh CX = desired information 0000h supported functions 0001h TASKID ID number Return: CX = ID number 0002h set-ID count Return: CX = ID set count Return: AL = FFh BX = highest supported subfunction number (0002h) SeeAlso: AX=7A14h,AX=7A18h --------N-2F7A1C----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - ??? AX = 7A1Ch BP = ??? CX:DX = ??? Return: AX = 70FFh --------N-2F7A1D----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - ??? AX = 7A1Dh ??? Return: ES = ??? ??? SI destroyed --------N-2F7A1E----------------------------- INT 2F U - Novell NetWare - TBMI v1.1+ - ??? AX = 7A1Eh ES:SI -> ??? ??? Return: ??? --------N-2F7A20BX0000----------------------- INT 2F - Novell NetWare - Advanced NetWare 4.0 DOS Requester - GET CALL ADDRESS AX = 7A20h BX = 0000h Return: AX = 0000h on success (installed) ES:BX -> far call address for DOS Requester Notes: the DOS Requester replaces the NetWare Shell (ANETx, NETx) on NetWare LAN's as of the release of Advanced NetWare 4.0 (1993). It is backward compatible with NetWare 2.1x through 3.11 servers as well. Note that there was a NetWare 4.0 in the early 1980's, which can cause confusion. this call is used as the installation check by VLM.EXE, which is the loader for all the modules of the DOS Requester Index: installation check;NetWare 4.0 DOS Requester --------N-2F7A20BX0001----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0001h Return: AX = 0000h ES:BX -> ??? entry point --------N-2F7A20BX0002----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ADDRESS AX = 7A20h BX = 0002h Return: AX = 0000h ES:BX -> ??? data --------N-2F7A20BX0003----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? AX = 7A20h BX = 0003h Return: AX = 0000h ES:BX -> ??? --------N-2F7A20BX0004----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ADDRESS AX = 7A20h BX = 0004h Return: AX = 0000h ES:BX -> ??? data (see below) Format of data: Offset Size Description 00h DWORD pointer to ??? (code) 04h 4 BYTEs ??? 08h DWORD pointer to ??? (code) ??? --------N-2F7A20BX0005----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0005h Return: AX = 0000h ES:BX -> ??? entry point --------N-2F7A20BX0006----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0006h Return: AX = 0000h ES:BX -> ??? entry point (RETF in v1.03) --------N-2F7A20BX0007----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0007h Return: AX = 0000h ES:BX -> ??? entry point (RETF in v1.03) --------N-2F7A20BX0008----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0008h Return: AX = 0000h ES:BX -> ??? entry point (RETF in v1.03) --------N-2F7A20BX0080----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0080h Return: AX = 0000h ES:BX -> ??? entry point (RETF in v1.03) Note: this function is identical to AX=7A20h/BX=0006h in v1.03 --------N-2F7A20BX0081----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0081h Return: AX = 0000h ES:BX -> ??? entry point (RETF in v1.03) Note: this function is identical to AX=7A20h/BX=0007h in v1.03 --------N-2F7A20BX0082----------------------- INT 2F - Novell NetWare - DOS Requester v1.03 - GET ??? ENTRY POINT AX = 7A20h BX = 0082h Return: AX = 0000h ES:BX -> ??? entry point (RETF in v1.03) Note: this function is identical to AX=7A20h/BX=0008h in v1.03 --------N-2F7A40----------------------------- INT 2F - Novell NetWare - TCP/IP Protocol Stack - INSTALLATION CHECK AX = 7A40h Return: AX = 7AFFh if installed BX = ??? bit 0: ??? bit 1: ??? bits 15-2: ??? CX = version (CH=major, CL=minor) DX = 0000h ES:DI -> entry point for TCP/IP stack (see below) Notes: Novell's LAN Workplace for DOS TCPIP.EXE also supports this interface this function is also supported by the Beame&Whiteside BWLWP40 shim, but it only returns AL and ES:DI, and does not support AX=7A41h SeeAlso: AX=7A41h,INT 60"Excelan" Call entry point with: ES:SI -> parameter block (see below) ??? Return: ES:SI parameter block updated Format of parameter block: Offset Size Description 00h DWORD ??? 04h WORD (return) ??? 06h WORD (return) ??? 08h 4 BYTEs ??? 0Ch BYTE flags??? 0Dh 7 BYTEs ??? 14h BYTE (return) ??? 15h BYTE (call) ??? number, bit 7 set if ??? 16h BYTE ??? 17h BYTE (return) result or error code ??? --------N-2F7A41----------------------------- INT 2F - Novell NetWare - TCP/IP Protocol Stack - WINDOWS SUPPORT??? AX = 7A41h ES:DI -> FAR entry point for ??? (will be called with BX=1,2,3,4) Return: AX = 7AFFh if supported BX = ??? (see AX=7A40h) CX = version (CH=major, CL=minor) DX = 0000h ES:SI -> DWORD containing passed value of ES:DI ES:DI -> entry point for TCP/IP stack Notes: Novell's LAN Workplace for DOS TCPIP.EXE also supports this interface the pointer which is set to ES:DI is cleared to 0000h:0000h when a Windows exit broadcast is received SeeAlso: AX=7A40h --------N-2F7A42----------------------------- INT 2F - Novell NetWare - TCPIP.EXE v4.1 - GET ??? ENTRY POINT AX = 7A42h Return: AX = 7AFFh if supported ES:DI -> ??? entry point (see below) Call entry point with: DX = ??? ES:DI -> ??? (see below) Return: AX = 0000h other registers destroyed Format of data buffer: Offset Size Description 00h WORD offset of WORD ??? or 0000h 02h WORD offset of DWORD ??? or 0000h 04h WORD offset of DWORD ??? or 0000h --------N-2F7A43----------------------------- INT 2F - Novell NetWare - TCPIP.EXE v4.1 - ??? AX = 7A43h Return: AX = 7AFFh if supported DX = offset of ??? SeeAlso: AX=7A44h --------N-2F7A44----------------------------- INT 2F - Novell NetWare - TCPIP.EXE v4.1 - ??? AX = 7A44h DX = offset of ??? (see AX=7A43h) Return: AX = 7AFFh if supported SeeAlso: AX=7A43h --------N-2F7A4C----------------------------- INT 2F - Novell NetWare - TCPIP.EXE v4.1 - GET ??? AX = 7A4Ch Return: AX = 7AFFh if supported BX = ??? (0037h) CX = ??? (001Ch) --------N-2F7A4DBX0001----------------------- INT 2F - Novell NetWare - ??? AX = 7A4Dh BX = 0001h ES:DI -> ??? Return: AL = FFh if ??? ES:DI -> ??? Note: called by NETBIOS.EXE v3.01 --------N-2F7A4FBX0001----------------------- INT 2F - Novell NetWare - SNMP.EXE - INSTALLATION CHECK AX = 7A4Fh BX = 0001h Return: AX = 7AFFh if installed --------N-2F7A4FBX0002----------------------- INT 2F - Novell NetWare - SNMP.EXE - ??? AX = 7A4Fh BX = 0002h Return: AL = status 4Fh if failed FFh if successful --------N-2F7A80----------------------------- INT 2F C - Novell NetWare - SHELL 3.01d BROADCAST - ABNORMAL EXIT AX = 7A80h Return: nothing Notes: called on abnormal exit of the NetWare shell to notify other Novell TSRs that it is unsafe to call the shell in the future. must be passed through so that all interested programs see the exit on receiving this call, IPXODI clears an internal pointer to a default value; Novell's NETBIOS.EXE clears its INT 21h pointer to 0000h:0000h and stops calling it SeeAlso: AX=7A81h --------N-2F7A81----------------------------- INT 2F C - Novell NetWare - SHELL 3.01d BROADCAST - SET SHELL INT 21 HANDLER AX = 7A81h CX:DX -> shell's INT 21h entry point Return: nothing Notes: the shell calls this function as it loads to allow interested TSRs and drivers to make a local copy of the shell's entry point must be passed through so that all interested programs see it --------N-2F7A85----------------------------- INT 2F C - Novell NetWare - shell 3.01 - BROADCAST INFORM AX = 7A85h CX = broadcast server number Return: CX = 0000h if broadcast message handled by another program CX unchanged if broadcast not handled --------N-2F7A90----------------------------- INT 2F U - Novell NetWare - NETBIOS.EXE 3+ - INSTALLATION CHECK AX = 7A90h Return: AL = 00h if present BX = ??? CX = PSP segment of NETBIOS resident code SeeAlso: AX=7AFEh --------N-2F7AC1----------------------------- INT 2F - LAN HiJack - LHR - DISABLE??? AX = 7AC1h Program: LAN HiJack is a NetWare utility by KDS Software which allows a user to take over control of a workstation remotely; LHR is the program run on the slave workstation SeeAlso: AX=7AC8h,AX=7AC9h,AX=7ACFh --------N-2F7AC2----------------------------- INT 2F - LAN HiJack - LHR - SYNCHRONIZE SHIFT STATES??? AX = 7AC2h Note: sets BIOS keyboard status byte to an internal variable SeeAlso: AX=7AC3h,AX=7ACFh --------N-2F7AC3----------------------------- INT 2F - LAN HiJack - LHR - CLEAR ??? FLAG AX = 7AC3h SeeAlso: AX=7AC2h,AX=7ACFh --------N-2F7AC8----------------------------- INT 2F - LAN HiJack - LHR - ENABLE FUNCTIONS AX = 7AC8h BL = function(s) to enable (see below) SeeAlso: AX=7AC1h,AX=7AC9h,AX=7ACFh Bitfields for function(s) to enable/disable: bit 0 ??? bit 1 remote keyboard enabled bit 2 support remote's mouse bits 3-7 unused --------N-2F7AC9----------------------------- INT 2F - LAN HiJack - LHR - DISABLE FUNCTIONS AX = 7AC9h BL = function(s) to disable (see AX=7AC8h) SeeAlso: AX=7AC1h,AX=7AC8h --------N-2F7ACA----------------------------- INT 2F - LAN HiJack - LHJ - ??? AX = 7ACAh BL = ??? Return: ??? Program: LAN HiJack is a NetWare utility by KDS Software which allows a user to take over control of a workstation remotely; LHJ is the program run on the controlling workstation --------N-2F7ACB----------------------------- INT 2F - LAN HiJack - LHJ - ??? AX = 7ACBh BX = ??? Return: ??? Note: this function appears to be related to the keyboard SeeAlso: AX=7ACCh --------N-2F7ACC----------------------------- INT 2F - LAN HiJack - LHJ - ??? AX = 7ACCh BX = ??? Return: ??? Note: this function appears to be related to the mouse SeeAlso: AX=7ACBh --------N-2F7ACFBX0000----------------------- INT 2F - LAN HiJack - LHR - INSTALLATION CHECK AX = 7ACFh BX = 0000h Return: BX = segment of resident code if installed Program: LAN HiJack is a NetWare utility by KDS Software which allows a user to take over control of a workstation remotely; LHR is the program run on the slave workstation --------N-2F7AF0----------------------------- INT 2F - Novell NetWare - DOSNP.EXE v1.30G - INSTALLATION CHECK AX = 7AF0h Return: AL = FFh if present ES = 7AF0h CX = PSP segment of resident code --------N-2F7AF1----------------------------- INT 2F - Novell NetWare - Access Server Driver - INSTALLATION CHECK AX = 7AF1h BL = sequence number (01h first driver, 02h second, 00h no driver) Return: AX <> 7AF1h if present BH = total number of drivers ---if BL nonzero on entry--- AL = number of ports provided by specified driver ES:DI -> driver entry point (see below) ES:DX -> ID string Call driver entry point with: AH function 01h initialize port AL = port number (00h-0Fh) ES:BX -> configuration parameter block (see below) interrupts disabled Return: CF clear if successful CF set on error 02h get port status AL = port number (00h-0Fh) interrupts disabled Return: CF clear if successful BL = transmitter status (see below) BH = receiver status (see below) DL = external status signals (see below) CF set on error interrupts disabled 03h get input from port AL = port number (00h-0Fh) CX = size of data buffer ES:BX -> buffer for data interrupts disabled Return: CF clear if successful CF set on error interrupts disabled CX = number of bytes read Note: the driver will add a NUL to the buffer when a break signal is detected 04h send output data to port AL = port number (00h-0Fh) CX = number of bytes to send ES:BX -> buffer containing data interrupts disabled Return: CF clear if successful CF set on error interrupts disabled CX = number of bytes actually written 05h get I/O character counts AL = port number (00h-0Fh) interrupts disabled Return: CF clear if successful BX = number of bytes pending transmission CX = number of bytes available for reading CF set on error interrupts disabled 06h control XON/XOFF AL = port number (00h-0Fh) DL = new state (00h software flow control disabled, else enabled) interrupts disabled Return: CF clear if successful CF set on error interrupts disabled 07h get error counts and statistics AL = port number (00h-0Fh) ES:BX -> buffer for statistics (see below) interrupts disabled Return: CF clear if successful ES:BX buffer filled CF set on error interrupts disabled 08h general request AL = port number (00h-0Fh) DX = requested operations bit 0: flush transmit buffers bit 1: flush receive buffers bit 4: define XON/XOFF characters ES:BX -> XON/XOFF characters (see below) if DX bit 4 set interrupts disabled Return: CF clear if successful CF set on error interrupts disabled 09h deadman timer management AL = port number (00h-0Fh) BX = next time interval in seconds (0000h to disable timer) interrupts disabled Return: CF clear interrupts disabled 0Ah get buffer sizes AL = port number (00h-0Fh) interrupts disabled Return: CF clear if successful BX = size of transmit buffer CX = size of receive buffer CF set on error interrupts disabled Values for transmitter status: 00h uninitialized 01h ready, not transmitting 02h transmitting 03h XOFF received 04h transmitting, buffer full 05h XOFF received and buffer full Values for receiver status: 00h uninitialized 01h ready 02h receive buffer full, data may have been lost Bitfields for external status signals: bits 7,6 undefined bit 5 CTS active bit 4 DSR active bit 3 DCD active bits 2,1 undefined bit 0 ring indicator Format of configuration parameter block: Offset Size Description 00h BYTE receive baud rate index 00h 50 bps, 01h 75 bps, 02h 110 bps, 03h 134.5 bps, 04h 150 bps, 05h 300 bps, 06h 600 bps, 07h 1200 bps, 08h 1800 bps, 09h 2000 bps, 0Ah 2400 bps, 0Bh 3600 bps, 0Ch 4800 bps, 0Dh 7200 bps, 0Eh 9600 bps, 0Fh 19200 bps, 10h 38400 bps, 11h 57600 bps, 12h 115200 bps 01h BYTE receive bits per character (0=5 bits..3=8 bits) 02h BYTE receive stop bits 03h BYTE receive parity 00h none, 01h odd, 02h even, 03h mark, 04h space 04h BYTE transmit baud rate index (same as receive baud rate) 05h BYTE transmit bits per character (0=5 bits..3=8 bits) 06h BYTE transmit stop bits 07h BYTE transmit parity (same as receive parity) 08h BYTE DTR state (00h off, 01h on) 09h BYTE RTS state (00h off, 01h on) 0Ah BYTE flow control 00h none, 01h XON/XOFF, 02h RTS/CTS, 03h both 0Bh BYTE break control (00h off, 01h on) Format of statistics: Offset Size Description 00h BYTE port number 01h BYTE external status signals (see above) 02h BYTE transmitter status (see above) 03h BYTE receiver status (see above) 04h DWORD number of characters received 08h DWORD number of characters transmitted 0Ch WORD input parity errors 0Eh WORD input framing errors 10h WORD lost characters due to hardware overrun 12h WORD lost characters due to data buffer overrun Note: the counts are not allowed to wrap around; once a count reaches FFFFh or FFFFFFFFh, it is no longer incremented Format of XON/XOFF characters: Offset Size Description 00h BYTE 04h (number of bytes following) 01h BYTE transmit XON character 02h BYTE transmit XOFF character 03h BYTE receive XON character 04h BYTE receive XOFF character --------N-2F7AFE----------------------------- INT 2F - Novell NetWare - DOSNP.EXE - INSTALLATION CHECK AX = 7AFEh Return: AL = FFh if present ES = (data???) segment of DOSNP Program: DOSNP.EXE provides "named pipes" support for DOS workstations running NetWare Note: the NetWare shell calls this function and refuses to load if DOSNP is present SeeAlso: AX=7A90h --------N-2F7AFFBX0000----------------------- INT 2F - Novell NetWare - TBMI v1.1+ - INSTALLATION CHECK??? AX = 7AFFh BX = 0000h CX = 4E65h ("Ne") DX = 7457h ("tW") ES:DI -> IPX/SPX special handler (XMS/EMS ???) Return: AL = FFh if installed CX = configured sockets (14h) DS:SI -> data table ??? ES:DI -> IPX far call handler Notes: for IPX/SPX this call reportedly returns DS:DI pointing to the table of pointers to service events queue head and tail this function is also supported by IPXODI SeeAlso: AX=7AFFh/BX=0001h --------N-2F7AFFBX0001----------------------- INT 2F - Novell NetWare - TBMI v1.1+, shell v3.01d - INSTALLATION CHECK??? AX = 7AFFh BX = 0001h CX = 4E65h ("Ne") DX = 7457h ("tW") Return: AL = FFh if installed CX = ??? (8000h) SI = ??? (or -> ???) (0002h) ES:DI -> IPX far call handler ES:DX -> 6-byte data area ??? Note: this function is also supported by IPXODI SeeAlso: AX=7AFFh/BX=0000h --------d-2F7F00----------------------------- INT 2F - Jim Harper's CD-ROM redirector SCSI driver - INSTALLATION CHECK AX = 7F00h Return: AL = FFh if installed SeeAlso: AX=7F01h,AX=7F02h,AX=7F03h --------d-2F7F01----------------------------- INT 2F - Jim Harper's CD-ROM redirector SCSI driver - DO COMMAND AX = 7F01h DS:DX -> command record (see below) Return: AL = status 00h successful else error code SeeAlso: AX=7F00h,AX=7F02h,INT 11/AH=FFh"SDLP",INT 21/AX=4402h"ASPI" SeeAlso: INT 4F/AX=8100h Format of command record: Offset Size Description 00h BYTE ID 01h 10 BYTEs CDB (Command Descriptor Block) for operation 0Bh WORD segment of buffer 0Dh WORD offset of buffer 0Fh BYTE status 10h BYTE sense 12h WORD count --------d-2F7F02----------------------------- INT 2F - Jim Harper's CD-ROM redirector SCSI driver - DO RESET AX = 7F02h SeeAlso: AX=7F00h,AX=7F01h --------d-2F7F03----------------------------- INT 2F - Jim Harper's CD-ROM redirector SCSI driver - UNINSTALL AX = 7F03h Return: AL = status 00h successful 01h unable to uninstall SeeAlso: AX=7F00h ----------2F7F24----------------------------- INT 2F - Multiplex - ??? AX = 7F24h ??? Return: ??? Note: called by PC/370, an IBM 370 emulator by Donald S. Higgins ----------2F7F26----------------------------- INT 2F - Multiplex - ??? AX = 7F26h ??? Return: ??? Note: called by PC/370, an IBM 370 emulator by Donald S. Higgins --------!------------------------------------