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Text File | 1989-07-23 | 289.3 KB | 8,084 lines

Please redistribute the following files unmodified as a group, in an archive named INTER489: INTERRUP.1ST the read-me file, containing credits, availability info INTERRUP.A INT 00 through INT 27 \ total 223 pages at 60 lines INTERRUP.B INT 28 through INT FF / per page, 241 with INTPRINT -p INTERRUP.PRI a brief introduction to interrupts INTPRINT.COM a simple formatter that also generates the list summary INTPRINT.DOC instructions for INTPRINT INTPRINT.C source code for INTPRINT --------------------------------------------- Release 89.4 Last change 7/22/89 --------------------------------------------- If you notice any mistakes or omissions, please let me know! It is only with YOUR help that the list can continue to grow at the current rate. Please read the file INTERRUP.1ST before asking me any questions. You may find that it's already been addressed. Ralf Brown ARPA: ralf@cs.cmu.edu \ UUCP: {ucbvax,harvard}!cs.cmu.edu!ralf > preferred BIT: ralf%cs.cmu.edu@cmuccvb / FIDO: Ralf Brown 1:129/46 (new address!) or post a message to the DR_DEBUG echo I reply to all submissions and inquiries, but some of my replies bounce because of bad return paths. If you don't get a response from me within a reasonable period of time, send it again with a better return path (starting at harvard or ucbvax for UUCP, from the ARPA Internet for others). --------------------------------------------- See INTERRUP.1ST for the key to system abbreviations and a list of the trademarks mentioned here. --------------------------------------------- DISCLAIMER: I verify the information contained in this list to the best of my ability, but I cannot be held responsible for any problems caused by use or misuse of the information, especially for those functions not officially documented. If it is marked "internal", you should check it carefully to make sure it works the same way in your version of the software (and please let me know whether or not it works the same way). Information marked with "???" is known to be incomplete or guesswork. --------------------------------------------- The use of -> instead of = signifies that the indicated register or register pair contains a pointer to the specified item, rather than the item itself --------------------------------------------- INT 00 - internal hardware - DIVIDE ERROR Automatically called at end of DIV or IDIV operation that results in error or overflow. Normally set by DOS to display an error message and abort the program. Note: on an 8086/8088, the return address points to the following instruction on an 80286/80386, the return address points to the divide instruction --------------------------------------------- INT 01 - internal hardware - SINGLE-STEP Generated at end of each machine instruction if TF bit in FLAGS is set. This is what makes the T command of DEBUG work for single-stepping. It is not generated after MOV to segment register or POP of segment register (unless you have a very early 8088 with a microcode bug). --------------------------------------------- INT 01 - internal hardware - DEBUGGING EXCEPTIONS (80386) Instruction address breakpoint fault - will return to execute instruction Data address breakpoint trap - will return to following instruction General detect fault, debug registers in use Task-switch breakpoint trap --------------------------------------------- INT 02 - external hardware - NMI (NON-MASKABLE INTERRUPT) Generated by NMI signal in hardware. This signal has various uses: Breakout switch on hardware debuggers Parity error: all except Jr and CONV Coprocessor interrupt: all except Jr and CONV Keyboard interrupt: Jr, CONV I/O channel check: CONV, PS50+ Disk-controller power-on request: CONV System suspend: CONV Real-time clock: CONV System watch-dog timer, time-out interrupt: PS50+ DMA timer time-out interrupt: PS50+ --------------------------------------------- INT 03 - ONE-BYTE INTERRUPT Generated by opcode CCh. Generally used to set breakpoints for debuggers. Also used by Turbo Pascal versions 1,2,3 when {$U+} specified --------------------------------------------- INT 04 - internal hardware - OVERFLOW Generated by INTO instruction if OF flag is set. If flag is not set, INTO is effectively a NOP. Used to trap any arithmetic errors before the erroneous results propagate further through the computation. --------------------------------------------- INT 05 - PRINT-SCREEN KEY Automatically called by keyboard scanner when print-screen key is pressed. Normally executes routine to print the screen, but may call any routine that can safely be executed from inside the keyboard scanner. Status and result byte for default handler is at address 0050:0000. --------------------------------------------- INT 05 - internal hardware - BOUND CHECK FAILED (80186+) Generated by BOUND instruction when the value to be tested is less than the indicated lower bound or greater than the indicated upper bound. Returning from this interrupt re-executes the failing BOUND instruction. --------------------------------------------- INT 06 - internal hardware - UNDEFINED OPCODE (80286+) --------------------------------------------- INT 07 - internal hardware - NO MATH UNIT AVAILABLE (80286+) Can be used to emulate a numeric coprocessor in software --------------------------------------------- INT 08 - IRQ0 - TIMER INTERRUPT Generated 18.2 times per second, this interrupt is used to keep the time-of-day clock updated. --------------------------------------------- INT 08 - internal hardware - DOUBLE FAULT (80286+ protected mode) Called when multiple exceptions occur on one instruction, or an exception occurs in an exception handler. If an exception occurs in the double fault handler, the CPU goes into SHUTDOWN mode (which circuitry in the PC/AT converts to a reset). --------------------------------------------- INT 09 - IRQ1 - KEYBOARD INTERRUPT Generated when data is received from the keyboard. This is normally a scan code, but may also be an ACK or NAK of a command on AT-class keyboards. --------------------------------------------- INT 09 - internal hardware - MATH UNIT PROTECTION FAULT (80286+ protected mode) --------------------------------------------- INT 0A - IRQ2 - EGA VERTICAL RETRACE Notes: on the Tandy 1000, this interrupt is used by the hard disk the TOPS and PCnet adapters use this interrupt request line by default --------------------------------------------- INT 0A - internal hardware - INVALID TASK STATE SEGMENT (80286+ protected-mode) --------------------------------------------- INT 0B - IRQ3 - COM2 INTERRUPT Note: the TOPS and PCnet adapters use this interrupt request line as an alternate Note: on PS/2's, COM2 through COM8 share this interrupt on many PC's, COM4 shares this interrupt --------------------------------------------- INT 0B - internal hardware - NOT PRESENT (80286+ protected-mode) Generated when loading a segment register if the segment descriptor indicates that the segment is not currently in memory. May be used to implement virtual memory. --------------------------------------------- INT 0C - IRQ4 - COM1 INTERRUPT Note: on many PC's, COM3 shares this interrupt --------------------------------------------- INT 0C - internal hardware - STACK FAULT (80286+) Generated on stack overflow/underflow in protected mode. Note that the 80286 will shut down in real mode if SP=1 before a push. On the PC AT and compatibles, external circuitry generates a reset on shutdown. --------------------------------------------- INT 0D - IRQ5 - FIXED DISK (PC), LPT2 (AT/PS) Note: the Tandy 1000 uses this line for the 60Hhz RAM refresh --------------------------------------------- INT 0D - internal hardware - GENERAL PROTECTION VIOLATION (80286+) Called in real mode when an instruction attempts to access a word operand located at offset FFFFh or a PUSH MEM or POP MEM instruction contains an invalid bit encoding in the second byte, or an instruction exceeds the maximum length allowed (10 bytes for 80286, 15 bytes for 80386) --------------------------------------------- INT 0E - IRQ6 - DISKETTE INTERRUPT Generated by floppy disk controller on completion of an operation --------------------------------------------- INT 0E - internal hardware - PAGE FAULT (80386 native mode) used to implement virtual memory --------------------------------------------- INT 0F - IRQ7 - PRINTER INTERRUPT Generated by the LPT1 printer adapter when printer becomes ready. Note: most printer adapters do not reliably generate this interrupt. --------------------------------------------- INT 10 - internal hardware - COPROCESSOR ERROR (80286+) Generated by the CPU when the -ERROR pin is asserted by the coprocessor. AT's and clones usually wire the coprocessor to use IRQ13, but not all get it right. --------------------------------------------- INT 10 - VIDEO - SET VIDEO MODE AH = 00h AL = mode (graphics mode if graphics resolution listed) text pixel graphic colors disp scrn system resol box resoltn page addr 00h = 40x25 8x8 B&W 8 B800 CGA = 40x25 8x14 B&W 8 B800 ATI VIP 01h = 40x25 8x8 16 8 B800 CGA = 40x25 8x14 16 8 B800 ATI VIP 02h = 80x25 8x8 B&W 4 B800 CGA = 80x25 8x8 B&W 8 B800 EGA,MCGA,VGA = 80x25 8x14 B&W 8 B800 ATI VIP 03h = 80x25 8x8 16 4 B800 CGA = 80x25 8x8 16 8 B800 EGA,MCGA,VGA 04h = 40x25 8x8 320x200 4 1 B800 CGA 05h = 40x25 8x8 320x200 4 gray 1 B800 CGA 06h = 80x25 8x8 640x200 B&W 1 B800 CGA 07h = 80x25 9x14 mono 1 B000 MDA,Hercules = 80x25 8 EGA,VGA = 80x25 9x14 mono B000 ATI VIP 08h = 20x25 8x8 160x200 16 B800 PCjr,Tandy 1000 09h = 40x25 8x8 320x200 16 B800 PCjr,Tandy 1000 0Ah = 80x25 8x8 640x200 4 B800 PCjr,Tandy 1000 0Bh = reserved (used internally by EGA BIOS) 0Ch = reserved (used internally by EGA BIOS) 0Dh = 40x25 8x8 320x200 16 8 A000 EGA,VGA 0Eh = 80x25 8x8 640x200 16 4 A000 EGA,VGA 0Fh = 80x25 8x14 640x350 mono 2 A000 EGA,VGA 10h = 80x25 8x14 640x350 4or16 2 A000 EGA,VGA 11h = 80x30 8x16 640x480 mono A000 VGA,MCGA,ATI EGA,ATI VIP 12h = 80x30 8x16 640x480 16/256k A000 VGA,ATI VIP = 80x30 8x16 640x480 16/64 A000 ATI EGA Wonder 13h = 40x25 8x8 320x200 256/256k A000 VGA,MCGA,ATI VIP 14h = 80x25 8x8 640x200 Lava Chrome II EGA = 640x400 16 Tecmar VGA/AD 15h = 80x25 8x14 640x350 Lava Chrome II EGA 16h = 80x25 8x14 640x350 Lava Chrome II EGA = 800x600 16 Tecmar VGA/AD 17h = 80x34 8x14 640x480 Lava Chrome II EGA = 132x25 Tecmar VGA/AD 18h = 132x44 8x8 mono Tseng Labs EVA = 80x34 8x14 640x480 Lava Chrome II EGA = 1024x768 16 Tecmar VGA/AD 19h = 132x25 8x14 mono Tseng Labs EVA 1Ah = 132x28 8x13 mono Tseng Labs EVA = 640x350 256 Tecmar VGA/AD 1Bh = 640x400 256 Tecmar VGA/AD 1Ch = 640x480 256 Tecmar VGA/AD 1Dh = 800x600 256 Tecmar VGA/AD 22h = 132x44 8x8 Tseng Labs EVA = 132x44 8x8 Ahead Systems EGA2001 = 132x43 Allstar Peacock (VGA) 23h = 132x25 6x14 Tseng Labs EVA = 132x25 8x14 Ahead Systems EGA2001 = 132x25 8x8 16 B800 ATI EGA Wonder,ATI VIP = 132x28 Allstar Peacock (VGA) 24h = 132x28 6x13 Tseng Labs EVA = 132x25 Allstar Peacock (VGA) 25h = 80x60 8x8 640x480 Tseng Labs EVA = 640x480 16 VEGA VGA 26h = 80x60 8x8 Tseng Labs EVA = 80x60 8x8 640x480 Ahead Systems EGA2001 = 80x60 Allstar Peacock (VGA) 27h = 720x512 16 VEGA VGA = 720x512 16 Genoa = 132x25 8x8 mono B800 ATI EGA Wonder,ATI VIP 28h = ???x??? VEGA VGA 29h = 800x600 16 VEGA VGA = 800x600 16 Orchid,STB,Genoa,Sigma = 800x600 16 Allstar Peacock (VGA) 2Ah = 100x40 Allstar Peacock (VGA) = 100x40 8x16 Orchid Prodesigner VGA 2Dh = 640x350 256 VEGA VGA = 640x350 256 Genoa,STB 2Eh = 640x480 256 VEGA VGA = 640x480 256 Orchid,STB,Genoa,Sigma 2Fh = 720x512 256 VEGA VGA = 720x512 256 Genoa 30h = 800x600 256 VEGA VGA = 800x060 256 Orchid,STB,Genoa,Sigma = ???x??? B800 AT&T 6300 33h = 132x44 8x8 16 B800 ATI EGA Wonder,ATI VIP 36h = 960x720 16 VEGA VGA = 960x720 16 STB 37h = 1024x768 16 VEGA VGA = 1024x768 16 Orchid,STB,Genoa,Sigma = 132x44 8x8 mono B800 ATI EGA Wonder,ATI VIP 40h = 80x25 8x16 640x400 2 1 B800 AT&T 6300, AT&T VDC600 = 80x25 8x16 640x400 2 1 B800 Compaq Portable = 80x43 VEGA VGA, Tecmar VGA/AD = 80x43 Video7 V-RAM VGA = 80x43 Tatung VGA 41h = 640x200 16 1 AT&T 6300 = 132x25 VEGA VGA = 132x25 Tatung VGA = 132x25 Video7 V-RAM VGA 42h = 80x25 8x16 640x400 16 AT&T 6300, AT&T VDC600 = 132x43 VEGA VGA = 132x43 Tatung VGA = 132x43 Video7 V-RAM VGA 43h = unsupported 640x200 of 640x400 viewport AT&T 6300 = 80x60 VEGA VGA = 80x60 Tatung VGA = 80x60 Video7 V-RAM VGA 44h = disable VDC and DEB output AT&T 6300 = 100x60 VEGA VGA = 100x60 Tatung VGA = 100x60 Video7 V-RAM VGA 45h = 132x28 Tatung VGA = 132x28 Video7 V-RAM VGA 46h = 100x40 8x15 800x600 2 AT&T VDC600 47h = 100x37 8x16 800x600 16 AT&T VDC600 48h = 80x50 8x8 640x400 2 B800 AT&T 6300, AT&T VDC600 49h = 80x30 8x16 640x480 Lava Chrome II EGA 4Dh = 120x25 VEGA VGA 4Eh = 120x43 VEGA VGA 4Fh = 132x25 VEGA VGA 50h = 132x25 9x14 mono Ahead Systems EGA2001 = 80x30 8x16 640x480 16 Paradise EGA-480 = 80x43 mono VEGA VGA = 640x480 mono??? Taxan 565 EGA = 80x34 Lava Chrome II EGA 51h = 80x30 8x16 Paradise EGA-480 = 80x30 Lava Chrome II EGA = 80x34 8x14 640x480 16 ATI EGA Wonder = 132x25 mono VEGA VGA 52h = 132x44 9x8 mono Ahead Systems EGA2001 = 132x43 mono VEGA VGA = 94x29 8x14 752x410 16 ATI EGA Wonder = 80x60 Lava Chrome II EGA 53h = 100x40 8x14 800x560 16 ATI EGA Wonder,ATI VIP = 132x43 Lava Chrome II EGA 54h = 132x43 8x8 Paradise EGA-480 = 132x43 7x9 16/256k B800 Paradise VGA = 132x43 8x9 16/256k B800 Paradise VGA on multisync = 132x43 Taxan 565 EGA = 132x43 AST VGA Plus = 132x43 Hewlett-Packard D1180A = 132x43 7x9 16 AT&T VDC600 = 132x25 Lava Chrome II EGA = 100x42 8x14 800x600 16 A000 ATI EGA Wonder, VGA Wondr 55h = 132x25 8x14 Paradise EGA-480 = 132x25 7x16 16/256k B800 Paradise VGA = 132x25 8x16 16/256k B800 Paradise VGA on multisync = 132x25 Taxan 565 EGA = 132x25 AST VGA Plus = 132x25 Hewlett-Packard D1180A = 132x25 7x16 16 AT&T VDC600 = 80x66 8x8 16/256k A000 ATI VIP = 94x29 8x14 752x410 Lava Chrome II EGA 56h = 132x43 8x8 3??? 2 B000 NSI Smart EGA+ = 132x43 7x9 4 B000 Paradise VGA = 132x43 8x9 4 B000 Paradisk VGA on multisync = 132x43 mono Taxan 565 EGA = 132x43 7x9 2 AT&T VDC600 57h = 132x25 8x14 3??? 4 B000 NSI Smart EGA+ = 132x25 7x16 4 B000 Paradise VGA = 132x25 8x16 4 B000 Paradise VGA on multisync = 132x25 mono Taxan 565 EGA = 132x25 7x16 2 AT&T VDC600 58h = 100x75 8x8 800x600 16/256k A000 Paradise VGA = 100x75 8x8 800x600 16 AT&T VDC600 = 80x33 8x14 16 B800 ATI EGA Wonder,ATI VIP = 800x600 16 AST VGA Plus, Compaq VGA = 800x600 16 Dell VGA = 800x600 16 Hewlett-Packard D1180A 59h = 100x75 8x8 800x600 2 A000 Paradise VGA = 100x75 8x8 800x600 2 AT&T VDC600 = 80x66 8x8 16/256k A000 ATI VIP = 800x600 2 AST VGA Plus, Compaq VGA = 800x600 2 Dell VGA = 800x600 2 Hewlett-Packard D1180A 5Eh = 640x400 256 Paradise VGA,VEGA VGA = 640x400 256 AST VGA Plus = 640x400 256 Compaq VGA, Dell VGA = 80x25 8x16 640x400 256 AT&T VDC600 5Fh = 640x480 256 Paradise VGA = 640x480 256 AST VGA Plus = 640x480 256 Compaq VGA, Dell VGA = 640x480 256 Hewlett-Packard D1180A = 80x30 8x16 640x480 256 AT&T VDC600 (512K) 60h = 80x??? ???x400 Corona/Cordata BIOS 4.10+ = 752x410 VEGA VGA = 752x410 16 Tatung VGA = 752x410 16 Video7 V-RAM VGA 61h = ???x400 Corona/Cordata BIOS 4.10+ = 720x540 VEGA VGA = 720x540 16 Tatung VGA = 720x540 16 Video7 V-RAM VGA = 640x400 256 A000 ATI VGA Wonder 62h = 800x600 VEGA VGA = 800x600 16 Tatung VGA = 800x600 16 Video7 V-RAM VGA = 640x480 256 A000 ATI VGA Wonder 63h = 1024x768 2 Video7 V-RAM VGA = 800x600 256 A000 ATI VGA Wonder 64h = 1024x768 4 Video7 V-RAM VGA 65h = 1024x768 16 Video7 V-RAM VGA = 1024x768 16 A000 ATI VGA Wonder 66h = 640x400 256 Tatung VGA = 640x400 256 Video7 V-RAM VGA 67h = 640x480 256 Video7 V-RAM VGA = 1024x768 4 A000 ATI VGA Wonder 69h = 720x540 256 Video7 V-RAM VGA 6Ah = 800x600 16 VESA standard interface 70h = extended mode set (see AX=0070h) Everex Micro Enhancer EGA 71h = 100x35 8x16 800x600 16of64 A000 NSI Smart EGA+ 74h = 640x400 2 B800 Toshiba 3100 AT&T mode 7Ch = 512x512 16 Genoa 7Dh = 512x512 256 Genoa 7Eh = special mode set (see AX=007Eh) Paradise VGA, AT&T VDC600 7Fh = special function set (see AX=007Fh) Paradise VGA, AT&T VDC600 82h = 80x25 B&W AT&T VDC overlay mode * 83h = 80x25 AT&T VDC overlay mode * 86h = 640x200 B&W AT&T VDC overlay mode * C0h = 640x400 2/prog pallet AT&T VDC overlay mode * C4h = disable output AT&T VDC overlay mode * D0h = 640x400 2 B800 DEC VAXmate AT&T mode ??? = 640x225 Z-100 ??? = 640x400 Z-100 * for AT&T VDC overlay modes, BL contains the DEB mode, which may be 06h, 40h, or 44h Note: IBM standard modes do not clear the screen if the high bit of AL is set --------------------------------------------- INT 10 - VIDEO - Everex Micro Enhancer EGA - EXTENDED MODE SET AX = 0070h BL = mode (graphics mode if graphics resolution listed) text pixel graphic color disp scrn monitor resol box resoltn page addr 00h = 640x480 16 multisync'ing 01h = 752x410 16 multisync'ing 02h = 800x600 16 multisync'ing 03h = 80x34 multisync'ing 04h = 80x60 multisync'ing 05h = 94x29 multisync'ing 06h = 94x51 multisync'ing 07h = reserved 08h = reserved 09h = 80x44 EGA 0Ah = 132x25 EGA 0Bh = 132x44 EGA 0Ch = 132x25 CGA 0Dh = 80x44 mono 0Eh = 132x25 mono 0Fh = 132x44 mono 10h = reserved 11h = 1280x350 4 12h = 1280x600 4 13h = 640x350 256 14h = 640x400 256 15h = 512x480 256 --------------------------------------------- INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - SET SPECIAL MODE AX = 007Eh BX = The horizontal dimension of the mode desired CX = The vertical dimension of the mode desired (both BX/CX in pixels for graphics modes, rows for alpha modes) DX = The number of colors of the mode desired (use 0 for monochrome modes) Return: BH = 7Eh if successful (Paradise VGA) AL = 7Eh if successful (AT&T VDC600) --------------------------------------------- INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - EXTENDED FUNCTIONS AX = 007Fh BH = 00h set VGA operation BH = 01h set non-VGA operation color modes (0,1,2,3,4,5,6) will set non-VGA CGA operation. monochrome mode 7 will set non-VGA MDA/Hercules operation. BH = 02h query mode status Return: BL = 00h if operating in VGA mode, 01h if non-VGA mode. CH = total video RAM size in 64k byte units. CL = video RAM used by the current mode. BH = 03h lock current mode allows current mode (VGA or non-VGA) to survive re-boot. BH = 04h enter CGA mode (AT&T VDC600 only) BH = 05h enter MDA mode (AT&T VDC600 only) BH = 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh WRITE PARADISE REGISTERS 0,1,2,3,4,5 (port 03CEh indices 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh) BL = value to set in the paradise register. BH = 1Ah,1Bh,1Ch,1Dh,1Eh,1Fh READ PARADISE REGISTERS 0,1,2,3,4,5 (port 03CEh indices 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh) Return: BL = value of the paradise register. BH = 7Fh if successful. Return: AL = 7Fh if successful (AT&T VDC600) --------------------------------------------- INT 10 - VIDEO - SET CURSOR CHARACTERISTICS AH = 01h CH bits 0-4 = start line for cursor in character cell bits 5-6 = blink attribute (00=normal, 01=invisible, 10=slow, 11=fast) CL bits 0-4 = end line for cursor in character cell Note: buggy on EGA systems--BIOS remaps cursor shape in 43 line modes, but returns unmapped cursor shape --------------------------------------------- INT 10 - VIDEO - SET CURSOR POSITION AH = 02h DH,DL = row, column (0,0 = upper left) BH = page number 0 in graphics modes 0-3 in modes 2&3 0-7 in modes 0&1 --------------------------------------------- INT 10 - VIDEO - READ CURSOR POSITION AH = 03h BH = page number 0 in graphics modes 0-3 in modes 2&3 0-7 in modes 0&1 Return: DH,DL = row,column CH = cursor start line CL = cursor end line --------------------------------------------- INT 10 - VIDEO - READ LIGHT PEN POSITION (all but PS) AH = 04h Return: AH = 00h light pen switch not activated = 01h light pen values in registers DH,DL = row,column of current position CH = raster line (0-199) (EGA) old graphics modes CX = (EGA) raster line (0-nnn) new graphics modes BX = pixel column (0-319 or 0-639) --------------------------------------------- INT 10 - VIDEO - SELECT DISPLAY PAGE AH = 05h AL = display page 0-7 for modes 0 & 1 0-3 for modes 2 & 3 --------------------------------------------- INT 10 - PCjr VIDEO - CRT/CPU PAGE REGISTERS AH = 05h AL = 80h read CRT/CPU page registers 81h set CPU page register BL = new page register value 82h set CRT page register BH = new page register value 83h set both display registers BL = new CPU page register BH = new CRT page register Return: BH = CRT page register BL = CPU page register --------------------------------------------- INT 10 - VIDEO - GRAPHICS BITMAP BUFFER (Corona/Cordata BIOS v4.10+) AH = 05h AL = 00h set address of graphics bitmap buffer (video modes 60h,61h) BX = segment of buffer 0Fh get address of graphics bitmap buffer (video modes 60h,61h) Return: DX = segment of graphics bitmap buffer --------------------------------------------- INT 10 - VIDEO - SCROLL PAGE UP AH = 06h AL = number of lines to scroll window (0 = blank whole window) BH = attributes to be used on blanked lines CH,CL = row,column of upper left corner of window to scroll DH,DL = row,column of lower right corner of window --------------------------------------------- INT 10 - VIDEO - SCROLL PAGE DOWN AH = 07h AL = number of lines to scroll window (0 = blank whole window) BH = attributes to be used on blanked lines CH,CL = row,column of upper left corner of window to scroll DH,DL = row,column of lower right corner of window --------------------------------------------- INT 10 - VIDEO - READ ATTRIBUTES/CHARACTER AT CURSOR POSITION AH = 08h BH = display page Return: AL = character AH = attribute of character (alpha modes) --------------------------------------------- INT 10 - VIDEO - WRITE ATTRIBUTES/CHARACTERS AT CURSOR POSITION AH = 09h AL = character BH = display page BL = attributes of character (alpha modes) or color (graphics modes) if bit 7 set in graphics mode, character is xor'ed onto screen CX = number of times to write character Note: all characters are displayed, including CR, LF, and BS --------------------------------------------- INT 10 - VIDEO - WRITE CHARACTERS ONLY AT CURSOR POSITION AH = 0Ah AL = character BH = display page - alpha mode BL = color of character (graphics mode, PCjr only) if bit 7 set in graphics mode, character is xor'ed onto screen CX = number of times to write character (EGA) in graphics modes, replication count in CX works correctly only if all character written are contains on the same row Note: all characters are displayed, including CR, LF, and BS --------------------------------------------- INT 10 - VIDEO - SET COLOR PALETTE AH = 0Bh BH = 00h BL = border color (0-15) (text modes) border color and background color (graphics modes) (EGA) BL = border color (0-15) and high-intensity background color (16-31??? maybe should be high nybble?) BH = 01h BL = palette (0-3) --------------------------------------------- INT 10 - VIDEO - WRITE DOT ON SCREEN AH = 0Ch AL = color of dot (0/1 in mode 6, 0-3 in modes 4 and 5) if bit 7 set, new color will be XORed with current pixel BH = display page (ignored if mode only supports one page) CX = column DX = row Note: only valid in graphics modes --------------------------------------------- INT 10 - VIDEO - READ DOT ON SCREEN AH = 0Dh BH = display page (ignored if mode only supports one page) CX = column DX = row Return: AL = color read Note: only valid in graphics modes --------------------------------------------- INT 10 - VIDEO - WRITE CHARACTER AND ADVANCE CURSOR (TTY WRITE) AH = 0Eh AL = character BH = display page (alpha modes) BL = foreground color (graphics modes) Note: characters 07h (BEL), 08h (BS), 0Ah (LF), and 0Dh (CR) are interpreted and do the expected things --------------------------------------------- INT 10 - VIDEO - GET CURRENT VIDEO MODE AH = 0Fh Return: AH = number of columns on screen AL = current video mode (see INT 10/AH=00h) BH = current active display page Note: if mode was set with bit 7 set ("no blanking"), the returned mode will also have bit 7 set --------------------------------------------- INT 10 - VIDEO - SET PALETTE REGISTER (Jr, PS, TANDY 1000, EGA, VGA) AX = 1000h BL = palette register to set BH = color value to store Note: on MCGA, only BX = 0712h is supported --------------------------------------------- INT 10 - VIDEO - SET BORDER COLOR REGISTER (Jr, PS, TANDY 1000, EGA, VGA) AX = 1001h BH = color value to store --------------------------------------------- INT 10 - VIDEO - SET ALL PALETTE REGISTERS (Jr, PS, TANDY 1000, EGA, VGA) AX = 1002h ES:DX -> 17-byte palette register list (see below) Format of palette register list: Offset Size Description 00h 16 BYTEs values for palette registers 0-15 10h BYTE value for border color register --------------------------------------------- INT 10 - VIDEO - TOGGLE INTENSITY/BLINKING BIT (Jr, PS, TANDY 1000, EGA, VGA) AX = 1003h BL = 00h enable intensity = 01h enable blink --------------------------------------------- INT 10 - VIDEO - GET INDIVIDUAL PALETTE REGISTER (VGA) AX = 1007h BL = palette register number Return: BH = palette register value --------------------------------------------- INT 10 - VIDEO - READ OVERSCAN (BORDER COLOR) REGISTER (VGA) AX = 1008h Return: BH = value --------------------------------------------- INT 10 - VIDEO - READ ALL PALETTE REGISTERS AND OVERSCAN REGISTER (VGA) AX = 1009h ES:DX -> 17-byte buffer (see AX=1002h) --------------------------------------------- INT 10 - VIDEO - SET INDIVIDUAL DAC REGISTER (EGA, VGA/MCGA) AX = 1010h BX = register number CH = new value for green (0-63) CL = new value for blue (0-63) DH = new value for red (0-63) --------------------------------------------- INT 10 - VIDEO - SET BLOCK OF DAC REGISTERS (EGA, VGA/MCGA) AX = 1012h BX = starting color register CX = number of registers to set ES:DX -> table of 3*CX bytes where each 3 byte group represents one byte each of red, green and blue (0-63) --------------------------------------------- INT 10 - VIDEO - SELECT VIDEO DAC COLOR PAGE (VGA) AX = 1013h BL = 00h Select paging mode BH = 00h Select 4 blocks of 64 BH = 01h Select 16 blocks of 16 BL = 01h Select Page BH = page number (00h to 03h) or (00h to 0Fh) Note: not valid in mode 13h --------------------------------------------- INT 10 - VIDEO - READ INDIVIDUAL DAC REGISTER (EGA, VGA/MCGA) AX = 1015h BL = palette register number Return: DH = red value CH = green value CL = blue value --------------------------------------------- INT 10 - VIDEO - READ BLOCK OF DAC REGISTERS (EGA, VGA/MCGA) AX = 1017h BX = starting palette register CX = number of palette registers to read ES:DX -> buffer (3 * CX bytes in size) (see also AX=1012h) Return: CX number of red, green and blue triples in buffer --------------------------------------------- INT 10 - VIDEO - undocumented - SET PEL MASK (EGA, VGA/MCGA) AX = 1018h BL = new PEL value --------------------------------------------- INT 10 - VIDEO - undocumented - READ PEL MASK (EGA, VGA/MCGA) AX = 1019h Return: BL = value read --------------------------------------------- INT 10 - VIDEO - GET VIDEO DAC COLOR-PAGE STATE (VGA) AX = 101Ah Return: BL = paging mode 00h four pages of 64 01h sixteen pages of 16 BH = current page --------------------------------------------- INT 10 - VIDEO - PERFORM GRAY-SCALE SUMMING (EGA, VGA/MCGA) AX = 101Bh BX = starting palette register CX = number of registers to convert --------------------------------------------- INT 10 - VIDEO - TEXT-MODE CHARACTER GENERATOR FUNCTIONS (PS, EGA, VGA) AH = 11h The following functions will cause a mode set, completely resetting the video environment, but without clearing the video buffer AL = 00h, 10h: load user-specified patterns ES:BP -> user table CX = count of patterns to store DX = character offset into map 2 block BL = block to load in map 2 BH = number of bytes per character pattern AL = 01h, 11h: load ROM monochrome patterns (8 by 14) BL = block to load AL = 02h, 12h: load ROM 8 by 8 double-dot patterns BL = block to load AL = 03h: set block specifier BL = block specifier (EGA/MCGA) bits 0,1 = block selected by chars with attribute bit 3 = 0 bits 2,3 = block selected by chars with attribute bit 3 = 1 (VGA) bits 0,1,4 = block selected by attribute bit 3 = 0 bits 2,3,5 = block selected by attribute bit 3 = 1 AL = 04h, 14h: load ROM 8x16 character set (VGA) The routines called with AL=1xh are designed to be called only immediately after a mode set and are similar to the routines called with AL=0xh, except that: Page 0 must be active. Bytes/character is recalculated. Max character rows is recalculated. CRT buffer length is recalculated. CRTC registers are reprogrammed as follows: R09 = bytes/char-1 ; max scan line (mode 7 only) R0A = bytes/char-2 ; cursor start R0B = 0 ; cursor end R12 = ((rows+1)*(bytes/char))-1 ; vertical display end R14 = bytes/char ; underline loc (*** BUG: should be 1 less ***) --------------------------------------------- INT 10 - VIDEO - GRAPHICS-MODE CHARACTER GENERATOR FUNCTIONS (PS, EGA, VGA) AH = 11h AL = 20h: set user 8 by 8 graphics characters (INT 1Fh) ES:BP -> user table AL = 21h: set user graphics characters ES:BP -> user table CX = bytes per character BL = row specifier 00h user set DL = number of rows 01h 14 rows 02h 25 rows 03h 43 rows AL = 22h: ROM 8 by 14 set BL = row specifier AL = 23h: ROM 8 by 8 double dot BL = row specifier AL = 24h: load 8x16 graphics characters (VGA/MCGA) BL = row specifier Note: these functions are meant to be called only after a mode set --------------------------------------------- INT 10 - VIDEO - GET FONT INFORMATION (EGA, MCGA, VGA) AX = 1130h BH = pointer specifier 00h INT 1Fh pointer 01h INT 44h pointer 02h ROM 8 by 14 character font pointer 03h ROM 8 by 8 double dot font pointer 04h ROM 8 by 8 DD font (top half) 05h ROM alpha alternate (9 by 14) pointer Return: ES:BP = specified pointer CX = bytes/character DL = character rows on screen --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS, EGA, VGA, MCGA) - GET EGA INFO AH = 12h BL = 10h Return: BH = 00h color mode in effect (I/O port 3Dxh) 01h mono mode in effect (I/O port 3Bxh) BL = 00h 64k bytes memory installed 01h 128k bytes memory installed 02h 192k bytes memory installed 03h 256k bytes memory installed CH = feature bits CL = switch settings --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS,EGA,VGA,MCGA) - ALTERNATE PRTSC AH = 12h BL = 20h select alternate print screen routine --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA) - SELECT VERTICAL RESOLUTION AH = 12h BL = 30h AL = vertical resolution 00h 200 scan lines 01h 350 scan lines 02h 400 scan lines Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - PALETTE LOADING AH = 12h BL = 31h AL = 00h enable default palette loading 01h disable default palette loading Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - VIDEO ADDRESSING AH = 12h BL = 32h AL = 00h enable video addressing 01h disable video addressing Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - GRAY-SCALE SUMMING AH = 12h BL = 33h AL = 00h enable gray scale summing 01h disable gray scale summing Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA) - CURSOR EMULATION AH = 12h BL = 34h AL = 00h enable alphanumeric cursor emulation 01h disable alphanumeric cursor emulation Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS) - DISPLAY-SWITCH INTERFACE AH = 12h BL = 35h AL = 00h initial adapter video off 01h initial planar video on 02h switch active video off 03h switch inactive video on 80h *UNDOCUMENTED* set system board video active flag ES:DX = buffer (128 byte save area if AL = 0, 2 or 3) Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS, VGA) - VIDEO REFRESH CONTROL AH = 12h BL = 36h AL = 00h enable refresh 01h disable refresh Return: AL = 12h if function supported --------------------------------------------- INT 10 - VIDEO - ALTERNATE FUNCTION SELECT - ??? AH = 12h BX = 5500h ??? (used by ATI and TAXAN) BX = 5502h ??? (used by ATI and TAXAN) --------------------------------------------- INT 10 - VIDEO - WRITE STRING (AT,XT286,PS,EGA,VGA) AH = 13h AL = mode bit 1: set if string contains alternating characters and attributes bit 0: set in order to move cursor after write BL = attribute if AL bit 1 clear BH = display page number DH,DL = row,column of starting cursor position CX = length of string ES:BP -> start of string Note: recognizes CR, LF, BS, and bell --------------------------------------------- INT 10 - VIDEO - LOAD USER-SPECIFIED LCD CHARACTER FONT (CONVERTIBLE) AX = 1400h ES:DI -> character font BH = number of bytes per character BL = 00h load main font (block 0) 01h load alternate font (block 1) CX = number of characters to store DX = character offset into RAM font area --------------------------------------------- INT 10 - VIDEO - LOAD SYSTEM ROM DEFAULT LCD CHARACTER FONT (CONVERTIBLE) AX = 1401h BL = 00h load main font (block 0) 01h load alternate font (block 1) --------------------------------------------- INT 10 - VIDEO - SET MAPPING OF LCD HIGH INTENSITY ATTRIBUTES (CONVERTIBLE) AX = 1402h BL = 00h ignore high intensity attribute 01h map high intensity to underscore 02h map high intensity to reverse video 03h map high intensity to selected alternate font --------------------------------------------- INT 10 - VIDEO - GET PHYSICAL DISPLAY PARAMETERS (CONVERTIBLE) AH = 15h Return: AX = alternate display adapter type 0000h none 5140h LCD 5153h CGA 5151h mono ES:DI -> parameter table (see below) Format of display parameter table: Offset Size Description 00h WORD monitor model number 02h WORD vertical pixels per meter 04h WORD horizontal pixels per meter 06h WORD total vertical pixels 08h WORD total horizontal pixels 0Ah WORD horizontal pixel separation in micrometers 0Ch WORD vertical pixel separation in micrometers --------------------------------------------- INT 10 - VIDEO - SET SUPERIMPOSE MODE (Sperry PC) AH = 15h AL = superimpose mode 00h show graphics screen 01h show text screen 02h show text screen superimposed on graphics screen --------------------------------------------- INT 10 - VIDEO - DISPLAY COMBINATION (PS,VGA/MCGA) AH = 1Ah AL = 00h read display combination code Return: BL = active display code (see below) BH = alternate display code 01h set display combination code BL = active display code (see below) BH = alternate display code Return: AL = 1Ah if function was supported Values of display combination codes: 00h no display 01h monochrome adapter w/ monochrome display 02h CGA w/ color display 03h reserved 04h EGA w/ color display 05h EGA w/ monochrome display 06h PGA w/ color display 07h VGA w/ monochrome analog display 08h VGA w/ color analog display 09h reserved 0Ah MCGA w/ digital color display 0Bh MCGA w/ monochrome analog display 0Ch MCGA w/ color analog display FFh unknown display type --------------------------------------------- INT 10 - VIDEO - FUNCTIONALITY/STATE INFORMATION (PS,VGA/MCGA) AH = 1Bh BX = implementation type = 0000h return funtionality/state information ES:DI -> 64 byte buffer for state information (see below) Return: AL = 1Bh if function supported ES:DI buffer filled with state information Format of state information: Offset Size Description 00h DWORD address of static funtionality table (see below) 04h BYTE video mode in effect 05h WORD number of columns 07h WORD length of regen buffer in bytes 09h WORD starting address of regen buffer 0Bh WORD cursor position for page 0 0Dh WORD cursor position for page 1 0Fh WORD cursor position for page 2 11h WORD cursor position for page 3 13h WORD cursor position for page 4 15h WORD cursor position for page 5 17h WORD cursor position for page 6 19h WORD cursor position for page 7 1Bh WORD cursor type 1Dh BYTE active display page 1Eh WORD CRTC port address 20h BYTE current setting of register (3?8) 21h BYTE current setting of register (3?9) 22h BYTE number of rows 23h WORD bytes/character 25h BYTE DCC of active display 26h BYTE DCC of alternate display 27h WORD number of colors supported in current mode 29h WORD number of pages supported in current mode 2Ah BYTE number of scan lines active (0,1,2,3) = (200,350,400,480) 2Bh BYTE primary character block 2Ch BYTE secondary character block 2Dh BYTE miscellaneous flags bit 0 all modes on all displays on 1 gray summing on 2 monochrome display attached 3 default palette loading disabled 4 cursor emulation enabled 5 0 = intensity; 1 = blinking 6 reserved 7 reserved 2Eh 3 BYTEs reserved 31h BYTE video memory available 00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K 32h BYTE save pointer state flags bit 0 512 character set active 1 dynamic save area present 2 alpha font override active 3 graphics font override active 4 palette override active 5 DCC override active 6 reserved 7 reserved 33h 13 BYTEs reserved Format of Static Functionality Table: Offset Size Description 00h BYTE modes supported #1 bit 0 to bit 7 = 1 modes 0,1,2,3,4,5,6 supported 01h BYTE modes supported #2 bit 0 to bit 7 = 1 modes 8,9,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh supported 02h BYTE modes supported #3 bit 0 to bit 3 = 1 modes 10h,11h,12h,13h supported bit 4 to bit 7 reserved 03h 4 BYTEs reserved 07h BYTE scan lines supported bit 0 to bit 2 = 1 if scan lines 200,350,400 supported 08h BYTE total number of character blocks available in text modes 09h BYTE maximum number of active character blocks in text modes 0Ah BYTE miscellaneous function flags #1 bit 0 all modes on all displays function supported 1 gray summing function supported 2 character font loading function supported 3 default palette loading enable/disable supported 4 cursor emulation function supported 5 EGA palette present 6 color palette present 7 color paging function supported 0Bh BYTE miscellaneous function flags #2 bit 0 light pen supported 1 save/restore state function 1Ch supported 2 intensity blinking function supported 3 Display Combination Code supported 4-7 reserved 0Ch WORD reserved 0Eh BYTE save pointer function flags bit 0 512 character set supported 1 dynamic save area supported 2 alpha font override supported 3 graphics font override supported 4 palette override supported 5 DCC extension supported 6 reserved 7 reserved 0Fh BYTE reserved --------------------------------------------- INT 10 - VIDEO - SAVE/RESTORE VIDEO STATE (PS50+,VGA) AH = 1Ch AL = 00h return state buffer size Return: BX = number of 64 byte blocks needed 01h save video state ES:BX -> buffer 02h restore video state ES:BX -> buffer containing previously saved state CX = requested states bit 0 video hardware 1 BIOS data areas 2 color registers and DAC state 3-15 reserved Return: AL = 1Ch if function supported --------------------------------------------- INT 10 - VIDEO - SET GRAPHICS MODE (Hercules GRAFIX) AH = 40h --------------------------------------------- INT 10 - VIDEO - SET TEXT MODE (Hercules GRAFIX) AH = 41h --------------------------------------------- INT 10 - VIDEO - CLEAR CURRENT PAGE (Hercules GRAFIX) AH = 42h --------------------------------------------- INT 10 - VIDEO - SELECT DRAWING PAGE (Hercules GRAFIX) AH = 43h AL = page number (0,1) --------------------------------------------- INT 10 - VIDEO - SELECT DRAWING FUNCTION (Hercules GRAFIX) AH = 44h AL = drawing function 00h clear pixels 01h set pixels 02h invert pixels --------------------------------------------- INT 10 - VIDEO - SELECT PAGE TO DISPLAY (Hercules GRAFIX) AH = 45h AL = page number (0,1) --------------------------------------------- INT 10 - VIDEO - DRAW ONE PIXEL (Hercules GRAFIX) AH = 46h DI = x (0-720) BP = y (0-347) Note: function 44h determines operation and function 43h which page to use --------------------------------------------- INT 10 - VIDEO - FIND PIXEL VALUE (Hercules GRAFIX) AH = 47h DI = x (0-720) BP = y (0-347) Return: AL = 00h pixel clear AL = 01h pixel set Note: function 43h specifies which page is used --------------------------------------------- INT 10 - VIDEO - MOVE TO POINT (Hercules GRAFIX) AH = 48h DI = x (0-720) BP = y (0-347) --------------------------------------------- INT 10 - VIDEO - DRAW TO POINT (Hercules GRAFIX) AH = 49h DI = x (0-720) BP = y (0-347) Note: function 48h or 49h specify first point, 44h operation and 43h page to use --------------------------------------------- INT 10 - VIDEO - BLOCK FILL (Hercules GRAFIX) AH = 4Ah --------------------------------------------- INT 10 - VIDEO - DISPLAY CHARACTER (Hercules GRAFIX) AH = 4Bh AL = character to display DI = x (0-720) BP = y (0-347) Note: Unlike the other BIOS character functions character position is specified in pixels rather than rows and columns. --------------------------------------------- INT 10 - VIDEO - DRAW ARC (Hercules GRAFIX) AH = 4Ch ??? --------------------------------------------- INT 10 - VIDEO - DRAW CIRCLE (Hercules GRAFIX) AH = 4Dh ??? --------------------------------------------- INT 10 - VIDEO - FILL AREA (Hercules GRAFIX) AH = 4Eh --------------------------------------------- INT 10 - SCROLOCK.COM - INSTALLATION CHECK AH = 50h Return: BX = 1954h if installed AL = 00 if inactive, nonzero if active Note: SCROLOCK is a utility supplied with System Enhancement Associates' ARC --------------------------------------------- INT 10 - SCROLOCK.COM - ENABLE/DISABLE AH = 51h AL = state 00h disable nonzero enable Note: SCROLOCK is a utility supplied with System Enhancement Associates' ARC --------------------------------------------- INT 10 - Direct Graphics Interface Standard (DGIS) - INQUIRE AVAILABLE DEVICES AX = 6A00h BX = 0000h CX = 0000h DX = buffer length (may be 0) ES:DI -> buffer Return: BX = number of bytes stored in buffer CX = bytes required for all descriptions (0 if no DGIS) Note: buffer contains descriptions and addresses of DGIS-compatible display(s) and printer(s) --------------------------------------------- INT 10 - DGIS - REDIRECT CHARACTER OUTPUT AX = 6A01h CX = 0000h ES:DI = address of device to send INT 10 output to Return: CX = 0000h output could not be redirected else INT 10h output now routed to requested display --------------------------------------------- INT 10 - DGIS - INQUIRE INT 10 OUTPUT DEVICE AX = 6A02h ES:DI = 0000h:0000h Return: ES:DI = 0000h:0000h if current display is non-DGIS else address of the current DGIS INT 10 display --------------------------------------------- INT 10 - VIDEO - INSTALLATION CHECK (Video7 VGA,VEGA VGA) AX = 6F00h Return: BX = 5637h ('V7') indicates Video7 VGA/VEGA VGA extensions are present --------------------------------------------- INT 10 - VIDEO - GETINFO (Video7 VGA,VEGA VGA) AX = 6F01h Return: AL = monitor type code (VEGA VGA only) AH = status register information bit 0 = display enable 0 = display enabled 1 = vertical or horizontal retrace in progress bit 1 = light pen flip flop set bit 2 = light pen switch activated bit 3 = vertical sync bit 4 = monitor resolution 0 = high resolution (>200 lines) 1 = low resolution (<=200 lines) bit 5 = display type 0 = color 1 = monochrome bits6,7= diagnostic bits Note: bits 0-3 are the same as the EGA/VGA status register bits 0-3 --------------------------------------------- INT 10 - VIDEO - GET MODE AND SCREEN RESOLUTION (Video7 VGA, VEGA VGA) AX = 6F04h Return: AL = current video mode (see AX=6F05h) BX = horizontal columns (text) or pixels (graphics) CX = vertical columns (text) or pixels (graphics) --------------------------------------------- INT 10 - VIDEO - SET VIDEO MODE (Video7 VGA, VEGA EXTENDED EGA/VGA) AX = 6F05h BL = mode (graphics mode if graphics resolution listed) text pixel graphic color disp scrn system resol box resoltn page addr 00h-13h = standard IBM modes 40h = 80x43 8x8 Video7/VEGA VGA 41h = 132x25 8x14 Video7/VEGA VGA 42h = 132x43 8x8 Video7/VEGA VGA 43h = 80x60 8x8 Video7/VEGA VGA 44h = 100x60 8x8 Video7/VEGA VGA 45h = 132x28 8x8 Video7/VEGA VGA 60h = 752x410 16 Video7 VGA, VEGA VGA 61h = 720x540 16 Video7 VGA, VEGA VGA 62h = 800x600 16 Video7 VGA, VEGA Ext EGA 63h = 1024x768 2 Video7 VGA 64h = 1024x768 4 Video7 VGA 65h = 1024x768 16 Video7 VGA, VEGA Ext EGA 66h = 640x400 256 Video7 VGA, VEGA Ext VGA 67h = 640x480 256 Video7 VGA, VEGA Ext VGA 68h = 720x540 256 Video7 VGA, VEGA Ext VGA 69h = 800x600 256 Video7 VGA, VEGA Ext VGA 70h = 752x410 16gray Video7 VGA, VEGA VGA 71h = 720x540 16gray Video7 VGA, VEGA VGA 72h = 800x600 16gray Video7 VGA 73h = 1024x768 2gray Video7 VGA 74h = 1024x768 4gray Video7 VGA 75h = 1024x768 16gray Video7 VGA 76h = 640x400 256gray Video7 VGA 77h = 640x480 256gray Video7 VGA 78h = 720x540 256gray Video7 VGA 79h = 800x600 256gray (future) --------------------------------------------- INT 10 - VIDEO - SELECT AUTOSWITCH MODE (V7VGA,VEGA VGA) AX = 6F06h BL = Autoswitch mode select 00h select EGA/VGA-only modes 01h select Autoswitched VGA/EGA/CGA/MGA modes 02h select 'bootup' CGA/MGA modes BH = enable/disable (00h enable, 01h = disable selection) --------------------------------------------- INT 10 - VIDEO - GET VIDEO MEMORY CONFIGURATION (V7VGA,VEGA VGA) AX = 6F07h Return: AL = 6Fh AH = bits 0-6 = number of 256K blocks of video memory bit 7 = DRAM/VRAM (0: DRAM, 1: VRAM) BH = chip revision (SR8F) (S/C Chip in VEGA VGA) BL = chip revision (SR8E) (G/A Chip in VEGA VGA) CX = 0000h --------------------------------------------- INT 10 - VIDEO - GET VIDEO RAM ADDRESS (TANDY 1000) AH = 70h Return: AX = segment address of the following [BX] = offset address of green plane [CX] = segment address of green plane [DX] = segment address of red/blue plane (red offset = 0, blue offset = 4000) --------------------------------------------- INT 10 - VIDEO - GET INCRAM ADDRESSES (TANDY 1000) AH = 71h Return: AX = segment address of the following [BX] = segment address of INCRAM [CX] = offset address of INCRAM --------------------------------------------- INT 10 - VIDEO - SCROLL SCREEN RIGHT (TANDY 1000) AH = 72h AL = number of columns blanked at left of window 00h = blank entire window BH = attributes to be used on blank columns CH,CL = row, column of upper left corner of window DH,DL = row, column of lower right corner -------------------------------------------- INT 10 - VIDEO - SCROLL SCREEN LEFT (TANDY 1000) AH = 73h AL = number of columns blanked at right of window 00h = blank entire window BH = attributes to be used on blank columns CH,CL = row, column of upper left corner of window DH,DL = row, column of lower right corner --------------------------------------------- INT 10 - VIDEO (DESQview 2.0x only) - internal - SET ??? HANDLER AH = 80h DX = 4456h ('DV') ES:DI -> FAR subroutine to be called on ??? Return: DS = segment of DESQview data structure for video buffer Note: this function is probably meant for internal use only, due to the magic value required in DX the subroutine seems to be called when the DESQview menu is accessed; on entry, AL = 3 or 4 --------------------------------------------- INT 10 - VIDEO (DESQview 2.0x only) - internal - GET ??? AH = 81h DX = 4456h ('DV') Return: ES = segment of DESQview data structure for video buffer BYTE ES:[0] = current window number in DV 2.0x Note: this function is probably meant for internal use only, due to the magic value required in DX --------------------------------------------- INT 10 - VIDEO (DESQview 2.0x only) - internal - GET CURRENT WINDOW INFO AH = 82h DX = 4456h ('DV') Return: DS = segment in DESQview for data structure in DV 2.00, BYTE DS:[0] = window number WORD DS:[1] = segment of other data structure WORD DS:[3] = segment of window's object handle ES = segment of DESQview data structure for video buffer AL = current window number AH = ??? BL = direct screen writes 00h program does not do direct writes 01h program does direct writes, so shadow buffer not usable BH = ??? CL = current video mode CH = ??? Note: this function is probably meant for internal use only, due to the magic value required in DX --------------------------------------------- INT 10 - VIDEO - Compaq Portable Extensions - SELECT EXTERNAL MONITOR AX = BF00h Note: all registers preserved and the internal monitor is blanked the external monitor becomes the active monitor --------------------------------------------- INT 10 - VIDEO - Compaq Portable Extensions - SELECT INTERNAL MONITOR AX = BF01h Note: all registers preserved and the external monitor is blanked the internal monitor becomes the active monitor --------------------------------------------- INT 10 - VIDEO - Compaq Portable Extensions - SET MASTER MODE OF CURRENT CTRLR AX = BF02h BH = master mode 04h CGA 05h EGA 07h MDA --------------------------------------------- INT 10 - VIDEO - Compaq Portable Extensions - GET ENVIRONMENT AX = BF03h BX = 0000h Return: BH = active monitor 00h = external 01h = internal BL = master mode 00h = switchable VDU not present 04h = CGA 05h = EGA 07h = MDA CH = 00h (reserved) CL = switchable VDU mode supported bit 0 = CGA supported bits 1,2 = reserved (1) bit 3 = MDA supported bits 4-7 = reserved (1) DH = internal monitor type 00h = none 01h = Dual-mode monitor 02h = 5153 RGB monitor 03h = Compaq Color monitor 04h = 640x400 flat panel DL = external monitor type 00h = none 01h = dual-mode monitor 02h = 5153 RGB monitor 03h = Compaq Color monitor 04h = 640x400 flat panel --------------------------------------------- INT 10 - VIDEO - Compaq Portable Extensions - SET MODE SWITCH DELAY AX = BF04h BH = 00h enable delay 01h disable delay --------------------------------------------- INT 10 - VIDEO - MSHERC.COM - INSTALLATION CHECK??? AH = EFh Return: DX = ??? Note: MSHERC.COM is a program included with the PC Tech Journal high-level benchmark suite that adds video modes 08h and 88h for Hercules cards, and supports text in the new graphics modes. --------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - READ ONE REGISTER AH = F0h BL = register number DX = group index Pointer/data chips 00h CRT Controller (25 reg) 3B4h mono modes, 3D4h color modes 08h Sequencer (5 registers) 3C4h 10h Graphics Controller (9 registers) 3CEh 18h Attribute Controller (20 registers) 3C0h Single registers 20h Miscellaneous Output register 3C2h 28h Feature Control register (3BAh mono modes, 3DAh color modes) 30h Graphics 1 Position register 3CCh 38h Graphics 2 Position register 3CAh Return: BL = data --------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - WRITE ONE REGISTER AH = F1h DX = group index (see AH=F0h) BL = register number BH = value to write Return: BL = data --------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - READ REGISTER RANGE AH = F2h CH = starting register number CL = Number of registers (>1) DX = group index 00h CRTC (3B4h mono modes, 3D4h color modes) 08h Sequencer 3C4h 10h Graphics Controller 3CEh 18h Attribute Controller 3C0h ES:BX -> buffer, CL bytes --------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - WRITE REGISTER RANGE AH = F3h CH = starting register CL = number of registers (>1) DX = group index (see AH=F2h) ES:BX -> buffer, CL bytes --------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - READ REGISTER SET AH = F4h CX = number of registers to read (>1) ES:BX -> table of records (see below) Return: register values in table filled in Format of entries in table of register records: Offset Size Description 00h WORD group index Pointer/data chips 00h CRTC (3B4h mono modes, 3D4h color modes) 08h Sequencer 3C4h 10h Graphics Controller 3CEh 18h Attribute Controller 3C0h Single registers 20h Miscellaneous Output register 3C2h 28h Feature Control register (3BAh mono modes, 3DAh color) 30h Graphics 1 Position register 3CCh 38h Graphics 2 Position register 3CAh 02h BYTE register number (0 for single registers) 03h BYTE register value --------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - WRITE REGISTER SET AH = F5h CX = number of registers to write (>1) ES:BX -> table of records (see AH=F4h) -------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - REVERT TO DEFAULT REGISTERS AH = F6h -------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - DEFINE DEFAULT REGISTER TABLE AH = F7h DX = port number Pointer/data chips 00h CRTC (3B4h mono modes, 3D4h color modes) 08h Sequencer 3C4h 10h Graphics Controller 3CEh 18h Attribute Controller 3C0h Single registers 20h Miscellaneous Output register 3C2h 28h Feature Control register (3BAh mono modes, 3DAh color modes) 30h Graphics 1 Position register 3CCh 38h Graphics 2 Position register 3CAh ES:BX -> table of one-byte entries, one byte to be written to each register -------------------------------------------- INT 10 - Microsoft Mouse driver EGA support - INTERROGATE DRIVER AH = FAh BX = 0000h Return: BX = 0000h if mouse driver not present ES:BX -> EGA Register Interface version number, if present: byte 0 = major release number byte 1 = minor release number -------------------------------------------- INT 10 - FASTBUFF.COM - INSTALLATION CHECK AH = FAh Return: AX = 00FAh if installed ES = segment of resident code Note: FASTBUFF.COM is a keyboard speedup/screen blanking utility by David Steiner -------------------------------------------- INT 10 - VIDEO (TopView) - GET VIDEO BUFFER AH = FEh ES:DI = segment:offset of assumed video buffer Return: ES:DI = segment:offset of actual video buffer --------------------------------------------- INT 10 - VIDEO (TopView) - UPDATE REAL SCREEN FROM VIDEO BUFFER AH = FFh CX = number of sequential characters that have been modified DI = offset of first character that has been modified ES = segment of video buffer Note: avoid CX=0 --------------------------------------------- INT 11 - EQUIPMENT DETERMINATION Return: AX = equipment flag bits 0 diskette installed 1 8087 present 2 mouse installed (PS2 only) 2,3 number of 16K banks of RAM on motherboard (PC only) number of 64K banks of RAM on motherboard (XT only) always = 11 on AT and above 4,5 initial video mode 01 = 40x25 color 10 = 80x25 color 11 = 80X25 IBM monochrome 6,7 number of diskette drives (only if bit 0 = 1) 00 = 1, 01 = 2, 10 = 3, 11 = 4 8 0 = DMA present, 1 = no DMA on system (PCjr) 9-11 number of RS232 cards 12 game I/O attached 13 serial printer installed (PCjr) internal modem installed (PC/Convertible) 14,15 number of printers --------------------------------------------- INT 12 - MEMORY SIZE Return: AX = number of contiguous 1K blocks of memory --------------------------------------------- INT 13 - DISK - RESET DISK SYSTEM AH = 00h DL = drive (if bit 7 is set both hard disks and floppy disks reset) --------------------------------------------- INT 13 - DISK - STATUS OF DISK SYSTEM AH = 01h Return: AL = status of last disk operation 00h = successful completion 01h = bad command 02h = address mark not found 03h = write attempted on write-protected disk 04h = sector not found 05h = reset failed (hard disk) 06h = diskette changed 07h = parameter act. failed (hard disk) 08h = DMA overrun (floppy disk) 09h = DMA across 64K boundary 0Ah = bad sector detected (hard disk) 0Bh = bad track detected (hard disk) 0Ch = unsupported track 0Dh = invalid number of sectors on format (hard disk) 0Eh = control data address mark detected (hard disk) 0Fh = DMA arbitration error (hard disk) 10h = bad CRC/ECC 11h = data ECC corrected (hard disk) 20h = controller failure 40h = seek failed 80h = time out AAh = drive not ready (hard disk) BBh = undefined error (hard disk) CCh = write fault (hard disk) E0h = status register error (hard disk) FFh = sense operation failed (hard disk) --------------------------------------------- INT 13 - DISK - READ SECTORS INTO MEMORY AH = 02h AL = number of sectors to read CH = track (for hard disk, bits 8,9 in high bits of CL) CL = sector DH = head DL = drive ES:BX -> buffer to fill Return: CF set on error AH = status (see AH=01h) AL = number of sectors read --------------------------------------------- INT 13 - DISK - WRITE SECTORS FROM MEMORY AH = 03h AL = number of sectors to write CH = track (if hard disk, bits 8,9 in high bits of CL) CL = sector (if hard disk, high two bits are high bits of track #) DH = head DL = drive ES:BX -> buffer Return: CF set on error AH = status (see AH=01h) AL = number of sectors written --------------------------------------------- INT 13 - DISK - VERIFY SECTORS AH = 04h AL = number of sectors to verify CH = track (for hard disk, bits 8,9 in high bits of CL) CL = sector DH = head DL = drive Return: CF set on error AH = status (see AH=01h) AL = number of sectors verified --------------------------------------------- INT 13 - FLOPPY - FORMAT TRACK AH = 05h AL = number of sectors to create on this track CH = track CL = sector DH = head DL = drive ES:BX -> array of 4-byte address fields byte 1 = track byte 2 = head byte 3 = sector byte 4 = bytes/sector 0=128, 1=256, 2=512, 3=1024 Return: CF set if error occurred AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - FORMAT TRACK AH = 05h AL = interleave value (XT only) ES:BX = 512-byte format buffer the first 2*(sectors/track) bytes contain F,N for each sector F = 00 for good sector, 80h for bad sector N = sector number CH = cylinder number (bits 8,9 in high bits of CL) CL = sector number DH = head DL = drive Return: AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - FORMAT TRACK AND SET BAD SECTOR FLAGS (XT,PORT) AH = 06h AL = interleave value CH = cylinder number (bits 8,9 in high bits of CL) CL = sector number DH = head DL = drive Return: AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - FORMAT DRIVE STARTING AT GIVEN TRACK (XT,PORT) AH = 07h AL = interleave value (XT only) ES:BX = 512-byte format buffer (see AH=05h) CH = cylinder number (bits 8,9 in high bits of CL) CL = sector number DH = head DL = drive Return: AH = status code (see AH=01h) --------------------------------------------- INT 13 - DISK - GET CURRENT DRIVE PARAMETERS (XT,AT,XT286,CONV,PS) AH = 08h DL = drive number Return: CF set on error AH = status code (see AH=01h) BL = drive type (see AH=17h) (AT/PS2 floppies only) DL = number of consecutive acknowledging drives DH = maximum value for head number CL = maximum value fo sector number CH = maximum value for cylinder number ES:DI = drive parameter table --------------------------------------------- INT 13 - FIXED DISK - INITIALIZE TWO FIXED DISK BASE TABLES (XT,AT,XT286,PS) AH = 09h Return: CF set on error AH = status code (see AH=01h) INT 41h points to table for drive 0 INT 46h points to table for drive 1 --------------------------------------------- INT 13 - FIXED DISK - READ LONG (XT,AT,XT286,PS) AH = 0Ah DL = drive ID DH = head CH = cylinder (bits 8,9 in high bits of CL) CL = sector ES:BX -> buffer to fill Return: CF set on error AH = status code (see AH=01h) AL = number of sectors read Note: used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - FIXED DISK - WRITE LONG (XT,AT,XT286,PS) AH = 0Bh DL = drive ID DH = head CH = cylinder (bits 8,9 in high bits of CL) CL = sector ES:BX -> buffer containing data Return: CF set on error AH = status code (see AH=01h) AL = number of sectors written Note: used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - FIXED DISK - SEEK TO CYLINDER (XT,AT,XT286,PS) AH = 0Ch DL = drive ID DH = head CH = cylinder (bits 8,9 in high bits of CL) Return: CF set on error AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - ALTERNATE DISK RESET (XT,AT,XT286,PS) AH = 0Dh DL = drive ID Return: CF set on error AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - READ SECTOR BUFFER (XT,PS) AH = 0Eh ES:BX -> buffer Return: CF set on error AH = status code (see AH=01h) Notes: transfers controller's sector buffer. No data is read from the drive used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - FIXED DISK - WRITE SECTOR BUFFER (XT,PS) AH = 0Fh ES:BX -> buffer Return: CF set on error AH = status code (see AH=01h) Notes: should be called before formatting to initialize the controller's sector buffer. used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - FIXED DISK - TEST FOR DRIVE READY (XT,AT,XT286,PS) AH = 10h DL = drive ID Return: CF set on error AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - RECALIBRATE DRIVE (XT,AT,XT286,PS) AH = 11h DL = drive ID Return: CF set on error AH = status code (see AH=01h) --------------------------------------------- INT 13 - FIXED DISK - CONTROLER RAM DIAGNOSTIC (XT,PS) AH = 12h Return: CF set on error AH = status code (see AH=01h) Note: used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - FIXED DISK - DRIVE DIAGNOSTIC (XT,PS) AH = 13h Return: CF set on error AH = status code (see AH=01h) Note: used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - FIXED DISK - CONTROLLER DIAGNOSTICS (XT,AT,XT286,PS) AH = 14h Return: CF set on error AH = status code (see AH=01h) Note: used for diagnostics only on PS/2 systems --------------------------------------------- INT 13 - DISK - GET TYPE (AT,XT2,XT286,CONV,PS) AH = 15h DL = drive ID Return: CF set on error AH = disk type 00h = disk not there 01h = floppy, no change detection present 02h = floppy with change detection 03h = fixed disk CX:DX = number of 512-byte sectors --------------------------------------------- INT 13 - FLOPPY DISK - CHANGE OF DISK STATUS (AT,XT2,XT286,CONV,PS) AH = 16h DL = drive to check Return: AH = disk change status 00h = no disk change 06h = disk changed --------------------------------------------- INT 13 - DISK - SET TYPE (AT,XT2,XT286,CONV,PS) AH = 17h AL = disk type 00h = no disk 01h = regular disk in regular drive 02h = regular disk in high-capacity drive 03h = high-capacity disk in high-capacity drive 04h = 720K disk in 720K drive DL = drive ID --------------------------------------------- INT 13 - DISK - SET MEDIA TYPE FOR FORMAT (AT model 3x9,XT2,XT286,PS) AH = 18h DL = drive number CH = lower 8 bits of number of tracks CL = sectors per track (bits 0-5) top 2 bits of number of tracks (bits 6,7) Return: AH = 00h requested combination supported 01h function not available 0Ch not supported or drive type unknown 80h there is no disk in the drive ES:DI -> 11-byte parameter table --------------------------------------------- INT 13 - FIXED DISK - PARK HEADS (XT286,PS) AH = 19h DL = drive Return: CF set on error AH = status (see AH=01h) --------------------------------------------- INT 13 - ESDI FIXED DISK - FORMAT UNIT (PS) AH = 1Ah AL = defect table count CL = format modifiers bit 4: generate periodic interrupt bit 3: perform surface analysis bit 2: update secondary defect map bit 1: ignore secondary defect map bit 0: ignore primary defect map DL = drive ES:BX -> defect table Return: CF set on error AH = status (see AH=01h) Note: if periodic interrupt selected, INT 15h/AH=0Fh is called after each cylinder is formatted --------------------------------------------- INT 13 - ESDI FIXED DISK - GET MANUFACTURING HEADER AH = 1Bh AL = number of record DL = drive ES:BX -> buffer for manufacturing header (defect list) Return: CF set on error AH = status Note: manufacturing header format (Defect Map Record format) can be found in IBM 70MB, 115MB Fixed Disk Drives Technical Reference --------------------------------------------- INT 13 - ESDI FIXED DISK - GET DEVICE CONFIGURATION AX = 1C0Ah DL = drive ES:BX -> buffer for device configuration (drive physical parameter) Return: CF set on error AH = status Note: device configuration format can be found in IBM ESDI Fixed Disk Drive Adapter/A Technical Reference --------------------------------------------- INT 13 - ESDI FIXED DISK - GET ADAPTER CONFIGURATION AX = 1C0Bh ES:BX -> buffer for adapter configuration Return: CF set on error AH = status --------------------------------------------- INT 13 - ESDI FIXED DISK - GET POS INFORMATION AX = 1C0Ch ES:BX -> POS information Return: CF set on error AH = status --------------------------------------------- INT 13 - ESDI FIXED DISK - TRANSLATE RBA TO ABA AX = 1C0Eh CH = low 8 bits of cylinder number CL = sector number, high two bits of cylinder number in bits 6 and 7 DH = head number DL = drive number ES:BX -> ABA number Return: CF set on error AH = status Note: ABA (absolute block address) format can be found in IBM ESDI Adapter Technical Reference by using it's Device Configuration Status Block --------------------------------------------- INT 13 - DISK - ??? (Western Digital "Super BIOS") AH = 20h ??? Return: ??? Note: seems to return some kind of status --------------------------------------------- INT 14 - SERIAL I/O - INITIALIZE USART AH = 00h AL = initializing parameters 7 - 6 - 5 4 - 3 2 1 - 0 -BAUD RATE- PARITY STOP WORD BITS LENGTH 000 110 bd 00 none 0: 1 00: 5 001 150 bd 01 odd 1: 2 01: 6 010 300 bd 11 even 10: 7 011 600 bd 11: 8 100 1200 bd 101 2400 bd 110 4800 bd 111 9600 bd (4800 on PCjr) DX = port number (0-3) Return: AH = RS-232 status code bits 0: data ready 1: overrun error 2: parity error 3: framing error 4: break detected 5: transmission buffer register empty 6: transmission shift register empty 7: time out--if set, other bits invalid AL = modem status bits 0: delta Clear-To-Send 1: delta Data-Set-Ready 2: trailing edge of ring detected 3: change in receive line signal detected 4: Clear-To-Send 5: Data-Set-Ready 6: ring detected 7: receive line signal detected --------------------------------------------- INT 14 - FOSSIL (Fido/Opus/Seadog Standard Interface Level) - INITIALIZE AH = 00h AL = initializing parameters 7 - 6 - 5 4 - 3 2 1 - 0 -BAUD RATE- PARITY STOP WORD BITS LENGTH 000 19200 bd 00 none 0: 1 00: 5 001 38400 bd 01 odd 1: 2 01: 6 010 300 bd 11 even 10: 7 011 600 bd 11: 8 100 1200 bd 101 2400 bd 110 4800 bd 111 9600 bd (4800 on PCjr) DX = port number (0-3 or FFh if only performing non-I/O setup) Return: AH = RS-232 status code bits 0: RDA - input data is available in buffer 1: OVRN - data has been lost 5: THRE - room is available in output buffer 6: TSRE - output buffer empty AL = modem status bits 3: always 1 7: DCD - carrier detect --------------------------------------------- INT 14 - SERIAL I/O - TRANSMIT CHARACTER AH = 01h AL = character DX = port number (0-3) Return: AX = port status (see AH=00h) --------------------------------------------- INT 14 - SERIAL I/O - RECEIVE CHARACTER AH = 02h DX = port number (0-3) Return: AL = character received AH = RS-232 status code (see AH=00h) Note: will timeout if DSR is not asserted, even if function 03h returns data ready --------------------------------------------- INT 14 - FOSSIL - RECEIVE CHARACTER WITH WAIT AH = 02h DX = port number (0-3) Return: AL = character received AH = 00h --------------------------------------------- INT 14 - SERIAL I/O - GET USART STATUS AH = 03h DX = port number (0-3) Return: AX = port status code (see AH=00h) --------------------------------------------- INT 14 - SERIAL I/O - EXTENDED INITIALIZE (CONVERTIBLE,PS) AH = 04h AL = break status 00h if break 01h if no break BH = parity 00h no parity 01h odd parity 02h even parity 03h stick parity odd 04h stick parity even BL = number of stop bits 00h one stop bit 01h two stop bits (1.5 if 5 bit word length) CH = word length 00h 5 bits 01h 6 bits 02h 7 bits 03h 8 bits CL = bps rate 00h 110 01h 150 02h 300 03h 600 04h 1200 05h 2400 06h 4800 07h 9600 08h 19200 DX = port number Return: AX = port status code (see AH=00h) --------------------------------------------- INT 14 - FOSSIL - INITIALIZE DRIVER AH = 04h DX = port number optionally BX=4F50h ES:CX -> byte to be set upon ^C Return: AX = 1954h (if successful) BL = maximum function number supported (excluding 7Eh and above) BH = revision of FOSSIL supported DTR is raised Note: the word at offset 6 in the interrupt handler contains 1954h, and the following byte contains the maximum function number supported --------------------------------------------- INT 14 - SERIAL I/O - EXTENDED COMMUNICATION PORT CONTROL (CONVERTIBLE,PS) AH = 05h AL = 00h read modem control register Return: BL = modem control register (see below) AH = status AL = 01h write modem control register BL = modem control register bit 0: data terminal ready bit 1: request to send bit 2: OUT1 bit 3: OUT2 bit 4: LOOP bits 5-7 reserved Return: AX = status DX = port number --------------------------------------------- INT 14 - FOSSIL - DEINITIALIZE DRIVER AH = 05h DX = port number Return: none DTR is not affected --------------------------------------------- INT 14 - FOSSIL - RAISE/LOWER DTR AH = 06h DX = port AL = DTR state to be set 00h = lower 01h = raise --------------------------------------------- INT 14 - FOSSIL - RETURN TIMER TICK PARAMETERS AH = 07h Return: AL = timer tick interrupt number AH = ticks per second on interrupt number in AL DX = approximate number of milliseconds per tick --------------------------------------------- INT 14 - FOSSIL - FLUSH OUTPUT BUFFER WAITING TILL ALL OUTPUT IS DONE AH = 08h DX = port number --------------------------------------------- INT 14 - FOSSIL - PURGE OUTPUT BUFFER THROWING AWAY ALL PENDING OUTPUT AH = 09h DX = port number --------------------------------------------- INT 14 - FOSSIL - PURGE INTPUT BUFFER THROWING AWAY ALL PENDING INPUT AH = 0Ah DX = port number --------------------------------------------- INT 14 - FOSSIL - TRANSMIT NO WAIT AH = 0Bh AL = character DX = port number Return: AX = 0000h character not accepted = 0001h character accepted --------------------------------------------- INT 14 - FOSSIL - NON-DESTRUCTIVE READ AHEAD AH = 0Ch DX = port number Return: AX = FFFFh character not available AX = 00xxh character xx available --------------------------------------------- INT 14 - FOSSIL - KEYBOARD READ WITHOUT WAIT AH = 0Dh Return: AX = FFFFh character not available = xxyyh standard IBM-style scan code --------------------------------------------- INT 14 - FOSSIL - KEYBOARD READ WITH WAIT AH = 0Eh Return: AX = xxyyh standard IBM-style scan code --------------------------------------------- INT 14 - FOSSIL - ENABLE/DISABLE FLOW CONTROL AH = 0Fh AL = bit mask describing flow control requested 0: xon/xoff on transmit (watch for xoff while sending) 1: CTS/RTS (CTS on transmit/RTS on receive) 2: reserved 3: xon/xoff on receive (send xoff when buffer near full) 4-7: all 1 DX = port number --------------------------------------------- INT 14 - FOSSIL - EXTENDED ^C/^K CHECKING AND TRANSMIT ON/OFF AH = 10h AL = bit mask 0: enable/disable ^C/^K checking 1: enable/disable the transmitter DX = port number --------------------------------------------- INT 14 - FOSSIL - SET CURRENT CURSOR LOCATION AH = 11h DH = row DL = column Note: this is the same as INT 10/AH=02h --------------------------------------------- INT 14 - FOSSIL - READ CURRENT CURSOR LOCATION AH = 12h Return: DH = row DL = column Note: this is the same as INT 10/AH=03h --------------------------------------------- INT 14 - FOSSIL - SINGLE CHARACTER ANSI WRITE TO SCREEN AH = 13h AL = character Note: should not be called if it is unsafe to call DOS --------------------------------------------- INT 14 - FOSSIL - ENABLE OR DISABLE WATCHDOG PROCESSING AH = 14h AL = 01h enable watchdog 00h disable watchdog DX = port number --------------------------------------------- INT 14 - FOSSIL - WRITE CHARACTER TO SCREEN USING BIOS SUPPORT ROUTINES AH = 15h AL = character --------------------------------------------- INT 14 - FOSSIL - INSERT/DELETE FUNCTION FROM TIMER TICK CHAIN AH = 16h AL = function 00h = delete 01h = add ES:DX -> routine to call Return: AX = 0000h successful 0001h unsuccessful --------------------------------------------- INT 14 - FOSSIL - REBOOT SYSTEM AH = 17h AL = method 00h = cold boot 01h = warm boot --------------------------------------------- INT 14 - FOSSIL - READ BLOCK AH = 18h CX = maximum number of characters to transfer DX = port number ES:DI -> user buffer Return: AX = number of characters transfered --------------------------------------------- INT 14 - FOSSIL - WRITE BLOCK AH = 19h CX = maximum number of characters to transfer DX = port number ES:DI -> user buffer Return: AX = number of characters transfered --------------------------------------------- INT 14 - FOSSIL - BREAK BEGIN OR END AH = 1Ah AL = 00h stop sending 'break' 01h start sending 'break' DX = port number --------------------------------------------- INT 14 - FOSSIL - RETURN INFORMATION ABOUT THE DRIVER AH = 1Bh DX = port number CX = size of user buffer ES:DI -> user buffer for driver info (see below) Return: AX = number of characters transferred Format of driver info: Offset Size Description 00h WORD size of structure in bytes 02h BYTE FOSSIL spec driver conforms to 03h BYTE revision level of this specific driver 04h DWORD pointer to ASCIZ identification string 08h WORD size of the input buffer 0Ah WORD number of bytes left in buffer 0Ch WORD size of the output buffer 0Eh WORD number of bytes left in buffer 10h BYTE width of screen 11h BYTE length of screen 12h BYTE actual baud rate, computer to modem --------------------------------------------- INT 14 - FOSSIL - INSTALL AN EXTERNAL APPLICATION FUNCTION AH = 7Eh AL = code assigned to external application ES:DX -> entry point Return: AX = 1954h BL = code assigned to application (same as input AL) DH = 00h failed 01h successful --------------------------------------------- INT 14 - FOSSIL - REMOVE AN EXTERNAL APPLICATION FUNCTION AH = 7Fh AL = code assigned to external application ES:DX -> entry point Return: AX = 1954h BL = code assigned to application (same as input AL) DH = 00h failed 01h successful --------------------------------------------- INT 15 - CASSETTE - TURN ON MOTOR (PC,Jr) AH = 00h Return: CF set on error, AH = 86h if no cassette present --------------------------------------------- INT 15 - VMiX v2+ - INSTALLATION CHECK??? AH = 00h Return: DX = 0798h??? --------------------------------------------- INT 15 - CASSETTE - TURN OFF MOTOR (PC,Jr) AH = 01h Return: CF set on error, AH = 86h if no cassette present --------------------------------------------- INT 15 - VMiX - I/O CHANNEL OBJECT MANAGER AH = 01h STACK: WORD object ID of requestor DWORD pointer to name of requested method WORD arg1 WORD arg2 WORD arg3 WORD arg4 Return: DX:AX??? -> IRP structure or 0000h:0000h --------------------------------------------- INT 15 - CASSETTE - READ DATA BLOCKS (PC,Jr) AH = 02h CX = count of bytes ES:BX -> data area Return: CF set on error AH = status 01h CRC error 02h bad tape signals 04h no data 80h invalid command 86h no cassette present DX = count of bytes read ES:BX = pointer past last byte read --------------------------------------------- INT 15 - VMiX - MEMORY OBJECT MANAGER AH = 02h STACK: WORD object ID of requestor DWORD pointer to name of requested method WORD arg1 WORD arg2 WORD arg3 WORD arg4 WORD arg5 Return: DX:AX??? = pointer to memory block --------------------------------------------- INT 15 - CASSETTE - WRITE DATA BLOCKS (PC,Jr) AH = 03h CX = count of bytes to write ES:BX -> data area Return: CF set on error AH = status (see AH=02h) ES:BX = pointer past last byte written CX = 0 --------------------------------------------- INT 15 - VMiX - PROMPTED CONSOLE INPUT AH = 03h STACK: DWORD pointer to ASCII prompt WORD field outline character WORD length of input field DWORD address of pointer to input buffer WORD number of characters input Return: AX = length of input (input buffer is padded with blanks) --------------------------------------------- INT 15 - VMiX - VPRINTF AH = 04h STACK: DWORD control string DWORD array of arguments --------------------------------------------- INT 15 - VMiX - GET PROCESS ID OF CURRENT PROCESS AH = 05h Return: AX = process ID --------------------------------------------- INT 15 - VMiX - GET POINTER TO PROCESS CONTROL BLOCK AH = 06h STACK: WORD process ID Return: DX:AX??? -> process control block --------------------------------------------- INT 15 - VMiX - GET POINTER TO OBJECT CONTROL BLOCK AH = 07h STACK: WORD object type Return: DX:AX??? -> object control block --------------------------------------------- INT 15 - VMiX - GET CHANNEL CONTROL BLOCK AH = 08h STACK: WORD channel ID Return: DX:AX??? -> channel control block --------------------------------------------- INT 15 - VMiX - GET ID OF QUEUED ELEMENT AH = 09h STACK: WORD queue ID (0 = process queue, 1 = object, 3 = type) WORD subqueue ID Return: AX = ID --------------------------------------------- INT 15 - VMiX - GET ID OF NEXT QUEUED ELEMENT AH = 0Ah STACK: WORD queue ID (0 = process queue, 1 = object, 3 = type) WORD ID of current element in queue chain Return: AX = ID of next element --------------------------------------------- INT 15 - VMiX - GET TOTAL NUMBER OF ACTIVE PROCESSES AH = 0Bh Return: AX = number of active processes --------------------------------------------- INT 15 - VMiX - GET POINTER TO PROCESS TSS STACK AH = 0Ch STACK: WORD process ID Return: DX:AX??? -> TSS stack store --------------------------------------------- INT 15 - VMiX - START A CHILD PROCESS JOB SHELL AH = 0Dh STACK: DWORD ASCIZ string starting with requested I/O channel and followed by standard VMiX shell command string Return: AX = status --------------------------------------------- INT 15 - VMiX - TERMINATE PROCESS AH = 0Eh STACK: WORD process ID Return: AX = status --------------------------------------------- INT 15 - SYSTEM - FORMAT UNIT PERIODIC INTERRUPT (PS ESDI drives only) AH = 0Fh AL = phase code 00h reserved 01h surface analysis 02h formatting Return: CF clear if formatting should continue, set if it should terminate Note: called during ESDI drive formatting after each cylinder is completed --------------------------------------------- INT 15 - VMiX - GET KEY FIELD OF QUEUED ELEMENT AH = 0Fh STACK: WORD queue ID (0 = process queue, 1 = object q, 3 = type q) WORD ID of element in queue chain Return: AX = key --------------------------------------------- INT 15 - VMiX - EXECUTE FUNCTION IN PROTECTED MODE AH = 10h STACK: DWORD pointer to function N WORDs function args Return: ??? --------------------------------------------- INT 15 - TopView - "PAUSE" - GIVE UP CPU TIME AX = 1000h Return: after other processes run --------------------------------------------- INT 15 - TopView - "GETMEM" - ALLOCATE "SYSTEM" MEMORY AX = 1001h BX = number of bytes to allocate Return: ES:DI -> block of memory --------------------------------------------- INT 15 - TopView - "PUTMEM" - DEALLOCATE "SYSTEM" MEMORY AX = 1002h ES:DI -> previously allocated block Return: block freed --------------------------------------------- INT 15 - TopView - "PRINTC" - DISPLAY CHARACTER/ATTRIBUTE ON SCREEN AX = 1003h BH = attribute BL = character DX = segment of object handle for window Note: BX=0 does not display anything, it only positions the hardware cursor --------------------------------------------- INT 15 - TopView - UNIMPLEMENTED IN DV 2.x AH = 10h AL = 04h thru 12h Return: pops up "Programming error" window in DV 2.x --------------------------------------------- INT 15 - TopView - "GETBIT" - DEFINE A 2ND-LEVEL INTERRUPT HANDLER AX = 1013h ES:DI -> FAR service routine Return: BX = bit mask indicating which bit was allocated 0000h if no more bits available --------------------------------------------- INT 15 - TopView - "FREEBIT" - UNDEFINE A 2ND-LEVEL INTERRUPT HANDLER AX = 1014h BX = bit mask from INT 15/AX=1013h --------------------------------------------- INT 15 - TopView - "SETBIT" - SCHEDULE ONE OR MORE 2ND-LEVEL INTERRUPTS AX = 1015h BX = bit mask for interrupts to post Return: indicated routines will be called: (DV 2.0x) at next task switch (DV 2.2x) immediately --------------------------------------------- INT 15 - TopView - "ISOBJ" - VERIFY OBJECT HANDLE AX = 1016h ES:DI = possible object handle Return: BX = FFFFh if ES:DI is a valid object handle 0000h if ES:DI is not --------------------------------------------- INT 15 - TopView - UNIMPLEMENTED IN DV 2.x AX = 1017h Return: pops up "Programming error" window in DV 2.x --------------------------------------------- INT 15 - TopView - "LOCATE" - FIND WINDOW AT A GIVEN SCREEN LOCATION AX = 1018h BH = column BL = row ES = segment of object handle for window below which to search 0000h = start search with topmost window Return: ES = segment of object handle for window which is visible at the indicated position, or covered by indicated window --------------------------------------------- INT 15 - TopView - "SOUND" - MAKE TONE AX = 1019h BX = frequency in Hertz CX = duration in clock ticks (18.2 ticks/sec) Return: immediately, tone continues to completion Notes: if another tone is already playing, the new tone does not start until completion of the previous one. In DV 2.00, it is possible to enqueue about 32 tones before the process is blocked until a note completes. in DV 2.00, the lowest tone allowed is 20 Hz --------------------------------------------- INT 15 - TopView - "OSTACK" - SWITCH TO TASK'S INTERNAL STACK AX = 101Ah Return: stack switched --------------------------------------------- INT 15 - TopView - "BEGINC" - BEGIN CRITICAL REGION AX = 101Bh Return: task-switching temporarily disabled Note: will not task-switch until END CRITICAL REGION (AX = 101Ch) called --------------------------------------------- INT 15 - TopView - "ENDC" - END CRITICAL REGION AX = 101Ch Return: task-switching enabled --------------------------------------------- INT 15 - TopView - "STOP" - STOP TASK AX = 101Dh ES = segment of object handle for task to be stopped (== handle of main window for that task) Return: indicated task will no longer get CPU time Note: at least in DV 2.00, this function is ignored unless the indicated task is the current task. --------------------------------------------- INT 15 - TopView - "START" - START TASK AX = 101Eh ES = segment of object handle for task to be started (== handle of main window for that task) Return: indicated task is started up again --------------------------------------------- INT 15 - TopView - "DISPEROR" - POP-UP ERROR WINDOW AX = 101Fh BX = bit fields bits 0-12: number of characters to display bits 13,14: which mouse button may be pressed to remove window 00 = either 01 = left 10 = right 11 = either bit 15: beep if 1 DS:DI -> text of message CH = width of error window (0 = default) CL = height of error window (0 = default) DX = segment of object handle Return: BX = status: 1 = left button, 2 = right, 27 = ESC pressed Note: window remains on-screen until ESC or indicated mouse button is pressed --------------------------------------------- INT 15 - TopView - UNIMPLEMENTED IN DV 2.0x AX = 1020h Return: pops up "Programming error" window in DV 2.0x --------------------------------------------- INT 15 - TopView - "PGMINT" - INTERRUPT ANOTHER TASK AX = 1021h BX = segment of object handle for task to interrupt DX:CX -> FAR routine to jump to next time task is run Return: nothing Note: the current ES, DS, SI, DI, and BP are passed to the FAR routine --------------------------------------------- INT 15 - TopView - "GETVER" - GET VERSION AX = 1022h BX = 0 Return: BX nonzero, TopView or compatible loaded (BL = major version, BH = minor version) Notes: TaskView returns BX = 0001h, DESQview 2.0 returns BX = 0A01h --------------------------------------------- INT 15 - TopView - "POSWIN" - POSITION WINDOW AX = 1023h BX = segment of object handle for parent window within which to position the window (0 = full screen) ES = segment of object handle for window to be positioned DL = bit flags bits 0,1: horizontal position 00 = current 01 = center 10 = left 11 = right bits 2,3: vertical position 00 = current 01 = center 10 = top 11 = bottom bit 4: don't redraw screen if set bits 5-7 not used CH = number of columns to offset from position specified by DL CL = number of rows to offset from position specified by DL Return: nothing --------------------------------------------- INT 15 - TopView - "GETBUF" - GET VIRTUAL SCREEN INFO AX = 1024h BX = segment of object handle for window (0 = use default) Return: ES:DI -> virtual screen CX = size of virtual screen in bytes DL = 00h text screen 01h graphics screen --------------------------------------------- INT 15 - TopView - "USTACK" - SWITCH BACK TO USER'S STACK AX = 1025h Return: stack switched back Note: call only after INT 15h/AX=101Ah --------------------------------------------- INT 15 - DESQview (TopView???) - UNIMPLEMENTED IN DV 2.x AH = 10h AL = 26h thru 2Ah Return: pops up "Programming error" window in DV 2.x --------------------------------------------- INT 15 - DESQview 2.0 (TopView???) - "POSTTASK" - AWAKEN TASK AX = 102Bh BX = segment of object handle for task Return: nothing --------------------------------------------- INT 15 - DESQview 2.0 (TopView???) - START NEW APPLICATION IN NEW PROCESS AX = 102Ch ES:DI -> contents of .PIF/.DVP file (see below) BX = size of .PIF/.DVP info Return: BX = segment of object handle for new task 0000h on error Format of .PIF/.DVP file: Offset Size Description 00h WORD reserved (0) 02h 30 BYTEs program title (blank-padded) 20h WORD maximum memory to allocate to partition in K 22h WORD minimum memory required in K 24h 64 BYTEs ASCIZ program pathname 64h BYTE default drive letter ('A',...) 65h 64 BYTEs ASCIZ default directory name A5h 64 BYTEs ASCIZ program parameters E5h BYTE initial screen mode (0-7) E6h BYTE number of text pages used E7h BYTE number of first interrupt to save E8h BYTE number of last interrupt to save E9h BYTE rows in virtual screen buffer EAh BYTE columns in virtual screen buffer EBh BYTE initial window position, row ECh BYTE initial window position, column EDh WORD system memory in K EFh 64 BYTEs ASCIZ shared program name 12Fh 64 BYTEs ASCIZ shared program data file 16Fh BYTE flags1 bit 7: writes text directly to screen bit 6: runs in foreground only bit 5: uses math coprocessor bit 4: accesses system keyboard buffer directly bits 3-1: reserved (0) bit 0: swappable 170h BYTE flags2 bit 6: uses command-line parameters in field at A5h bit 5: swaps interrupt vectors ---information unique to .DVP files--- 171h 2 BYTEs keys to use on open menu 173h WORD size of script buffer in bytes 175h WORD automatically give up CPU after this many tests for keyboard input in one clock tick (0 = never) 177h BYTE nonzero = "uses own colors" 178h BYTE nonzero if application swappable 179h 3 BYTEs reserved (0) 17Ch BYTE nonzero to automatically close on exit 17Dh BYTE nonzero if copy-protect floppy is required ---information unique to DESQview 2.0+--- 17Eh BYTE .DVP version number 00h DESQview 1.2+ 01h DESQview 2.0+ 02h DESQview 2.2+ 17Fh BYTE reserved (0) 180h BYTE initial number of rows in physical window 181h BYTE initial number of columns in physical window 182h WORD maximum expanded memory to allow, in K 184h BYTE flags3 bit 7: automatically assign window position bit 5: maximum memory value has been specified bit 4: disallow "Close" command bit 3: foreground-only when doing graphics bit 2: don't virtualize 185h BYTE keyboard conflict level (0-4) 186h BYTE number of graphics pages used 187h WORD extra system memory size 189h BYTE initial screen mode (FFh = default) ---information unique to DESQview 2.2+--- 18Ah BYTE serial port usage FFh uses all serial ports 00h no serial ports 01h only COM1 02h only COM2 18Bh BYTE flags4 bit 7: automatically close application on exit if .COM or .EXE specified bit 6: swappable if not using serial ports bit 3: virtualize text bit 2: virtualize graphics bit 1: share CPU when foreground bit 0: share EGA when foreground and zoomed 18Ch BYTE protection level for 386 machines 18Dh 19 BYTEs reserved (0) --------------------------------------------- INT 15 - DESQview 2.0 - KEYBOARD MOUSE CONTROL AX = 102Dh BL = subfunction 00h determine whether using keyboard mouse Return: BL = 00h using real mouse 01h using keyboard mouse 01h turn keyboard mouse on 02h turn keyboard mouse off --------------------------------------------- INT 15 - TopView commands AH = 11h AL = various Note: in DESQview 2.x, these function calls are identical to AH=DEh, so see those below --------------------------------------------- INT 15 - VMiX - EXECUTE SHELL SYSTEM COMMANDS AH = 11h STACK: DWORD pointer to ASCIZ string containing and VMiX shell request (max len = 127) Return: AX = status --------------------------------------------- INT 15 - DESQview 2.2 - "ASSERTMAP" - GET/SET MAPPING CONTEXT AX = 1117h BX = 0000h get current mapping context without setting nonzero set new mapping context Return: BX = mapping context in effect before call Notes: this function differs from AX = DE17h mapping contexts determine conventional-memory addressability; setting a mapping context ensures that the associated program and data areas are in memory for access. Usable by drivers, TSRs and shared programs. Caller need not be running under DESQview --------------------------------------------- INT 15 - DESQview - XDV.COM - INSTALLATION CHECK AX = 11DEh Return: CF clear if installed AX = segment at which XDV is located --------------------------------------------- INT 15 - VMiX - PUT PROCESS TO SLEEP AH = 12h STACK: WORD process ID Return: AX = status --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "HANDLE" - RETURN OBJECT HANDLE AH = 12h BH = 00h BL = which handle to return 00h handle in DWORD on top of stack 01h current task's window handle 02h given task's mailbox handle (task's handle on stack) 03h current task's mailbox handle 04h given task's keyboard handle (task's handle on stack) 05h current task's keyboard object handle 06h given task's OBJECTQ handle (task's handle on stack) 07h current task's OBJECTQ handle 08h \ thru > return 0000:0000 10h / Return: DWORD on top of stack is object handle --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "NEW" - CREATE NEW OBJECT AH = 12h BH = 01h BL = object 00h (DV 2.0x only) handle is DWORD on top of stack 01h (DV 2.0x only) use task's window handle 02h (DV 2.0x only) given task's mailbox (task's handle on stack) 03h (DV 2.0x only) current task's mailbox 04h (DV 2.0x only) given task's keyboard (task's handle on stack) 05h (DV 2.0x only) current task's keyboard object 08h WINDOW class 09h MAILBOX class 0Ah KEYBOARD class 0Bh TIMER object (counts down 32-bit time in 10ms increments) 0Fh POINTER object 10h PANEL object STACK: (if window object or WINDOW class) DWORD address to jump to (no new task if high word == 0) DWORD (reserved) 0 = non-task window, FFFFh = task window DWORD bytes for task's private stack (FFFFh == default of 0100h) DWORD bytes system memory allocation (0 == none, -1 == default) DWORD window size, columns DWORD window size, rows DWORD length of window title DWORD address of window title Return: DWORD on top of stack is new object handle Note: if a new task is created, it is started with AX = BX = CX = SI = DI = BP = 0 DX = segment of parent's object handle DS = ES = SS = segment of private stack (and new task's object handle) --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "FREE" - FREE AN OBJECT AH = 12h BH = 02h BL = object 00h handle in DWORD on top of stack window: close window and free timer: free timer panel: free panel object pointer: free pointer 01h task's window handle - kills task, never returns 02h given task's mailbox (task's handle on top of stack) 03h current task's mailbox 04h given task's keyboard (task's handle on top of stack) 05h current task's keyboard object --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "DIR" - GET PANEL FILE DIRECTORY AH = 12h BX = 0300h STACK: DWORD handle of panel object Return: STACK: DWORD length of directory DWORD address of directory Format of panel file: Offset Size Descriptoin 00h 2 BYTEs C0h C3h 02h BYTE number of panels in file 03h for each panel in file: 8 BYTEs blank-padded panel name DWORD panel offset in file WORD panel length data for panels (each consists of one or more window/query/manager streams) first byte of each panel must be 1Bh, fifth byte must be E5h --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "ADDR" - GET OBJECT HANDLE AH = 12h BH = 03h BL = object 00h handle in DWORD on top of stack 02h sender of last msg read from mailbox (task's handle on stack) 03h sender of last msg read from current task's mailbox Return: DWORD on stack is handle --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "READ" - WAIT FOR TIMER TO EXPIRE AH = 12h BX = 0400h STACK: DWORD timer's handle Return: STACK: DWORD time in 1/100 sec since midnight when timer expires --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "READ" - GET NEXT RECORD AH = 12h BH = 04h BL = object 00h handle is DWORD on top of stack window: read next logical line mailbox: wait for and get next message pointer: wait for and get next message 01h read the next logical line from task's default window 02h get next message from mailbox (task's handle on top of stack) 03h get next message from current task's mailbox 04h get the next input from keyboard (handle on top of stack) 05h get the next input from task's default keyboard 06h wait for input from any object in OBJECTQ (handle on stack) 07h wait for input from any object in task's default OBJECTQ Return: STACK: (if objectq) DWORD handle of object with input (otherwise) DWORD number of bytes DWORD address --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "APPLY" - WRITE PANEL TO WINDOW AH = 12h BX = 0400h STACK: DWORD handle of panel object DWORD window's handle or 0 DWORD length of panel name DWORD pointer to panel name Return: STACK: DWORD handle of created keyboard or 0 DWORD handle of window which was used Notes: status of APPLY may be checked with STATUS message panel MUST have the following format first byte must be 1Bh (i.e. must start with a stream) first opcode in stream must be E5h single byte arg of opcode is interpreted thus: bit 7 \ 11 means new window created bit 6 / 01 means existing window used bit 5 if set, create a new keyboard and put in field mode bit 4 if set and bit 5 set, make new keyboard active -------------------------------------------- INT 15 - TopView - SEND MESSAGE - "WRITE" - WRITE TO OBJECT AH = 12h BH = 05h BL = object 00h handle is DWORD on top of stack timer: start timer to end at a specified time pointer: move pointer icon to specified position 02h send message by value/status=0 to mbox (task's handle on stack) 03h send message by value/status=0 to current task's mailbox 04h add input buffer to KEYBOARD queue (handle on top of stack) 05h add input buffer to task's default KEYBOARD queue 06h add an object to OBJECTQ (handle on top of stack) 07h add an object to task's default OBJECTQ STACK: (if mailbox) DWORD length DWORD address (if keyboard) DWORD status (such as scan code) DWORD length DWORD address (if objectq) DWORD handle of object to add (if timer) DWORD 1/100ths seconds since midnight (actually only accurate to 1/18 sec) (if pointer) DWORD column relative to origin of window DWORD row relative to origin of window --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "WRITE" - WRITE STRING TO WINDOW AH = 12h BH = 05h BL = object 00h DWORD on top of stack is window handle 01h write string to task's default window STACK: DWORD object handle if handle passed on stack DWORD total length of string (high word == 0) DWORD address of string to display Note: service routine will pop stack Return: indicated actions performed a. non-control characters are displayed b. CR/LF/BS/Tab cause the usual cursor movement c. ESC starts a data structure with additional commands Data Structure: MAGIC DB 1Bh MODE DB ? ; 00h, 01h, 10h, 14h-1Fh legal LENGTH DW ? ; length of remainder in bytes var-length fields follow, each an OPCODE followed by zero or more args MODE 00h (set or display values) "WINDOW STREAM" Opcodes:args 00h display 20h blanks with the default attribute 01h-1Fh display OPCODE blanks with the default attribute 20h display char with default attribute 20h times BYTE char to repeat 21h-3Fh display char with default attribute OPCODE-20h times BYTE char to repeat 40h display 20h blanks with specified attribute BYTE attribute of blanks 41h-5Fh display OPCODE-40h blanks with specified attribute BYTE attribute of blanks 60h display next 20h characters 20h BYTES characters to display 61h-7Fh display next OPCODE-60h characters N BYTES characters to display 80h-87h display N blanks with default attribute BYTE low 8 bits of 11-bit count (high 3 in low 3 bits of OPCODE) [000h means 800h] 88h-8Fh display N copies of the character BYTE low 8 bits of 11-bit count (high 3 in low 3 bits of OPCODE) [000h means 800h] BYTE character to repeat 90h-97h display N blanks with specified attribute BYTE low 8 bits of 11-bit length (high 3 in low 3 bits of OPCODE) [000h means 800h] BYTE attribute 98h-9FH display string at logical cursor pos BYTE low 8 bits of 11-bit length (high 3 in low 3 bits of OPCODE) [000h means 800h] N BYTES string to display A0h set logical cursor row BYTE row number (0 is top) A1h set logical cursor column BYTE column number (0 is leftmost) A2h set top edge of scrolling region BYTE row A3h set left edge of scrolling region BYTE column A4h set row of physical window position BYTE line A5h set column of physical window position BYTE column A6h set height of physical window BYTE #rows A7h set width of physical window BYTE #columns A8h set viewport row BYTE row A9h set viewport column BYTE column AAh set virtual screen height BYTE rows ABh set virtual screen width BYTE columns ACh-AEh unused AFh set compatible/preferred video modes BYTE compatibility/preference mask bit 7 compatible with monochrome bit 6 compatible with color text, EGA/VGA graphics bit 5 compatible with medium-resolution CGA graphics bit 4 compatible with high-resolution CGA graphics bit 3 prefer monochrome bit 2 prefer color text, EGA/VGA graphics bit 1 prefer medium-resolution CGA graphics bit 0 prefer high-resolution CGA graphics B0h move logical cursor down BYTE #rows (signed, negative values move up) B1h move logical cursor right BYTE #cols (signed, negative values move left) B2h shift top edge of scrolling region BYTE #rows (signed) B3h shift left edge of scrolling region BYTE #cols (signed) B4h shift window down BYTE #lines (signed) B5h shift window right BYTE #columns (signed) B6h expand physical window vertically BYTE #lines (signed) B7h expand physical window horizontally BYTE #columns (signed) B8h adjust viewport row BYTE #rows (signed) B9h adjust viewport column BYTE #columns (signed) BAh adjust virtual screen height BYTE #rows to increase (signed) BBh adjust virtual screen width BYTE #cols to increase (signed) BCh-BFh unused C0h set logical cursor position BYTE row number (0 is top border) BYTE column number (0 is left border) C1h set top left corner of scrolling region BYTE row BYTE column C2h set window pos BYTE upper left row (no top border if 0) BYTE upper left column (no left border if 0) C3h set current window size BYTE #rows BYTE #cols C4h set upper left corner of viewport (portion of virtual screen displayed in window) BYTE row BYTE column C5h set size of virtual screen BYTE #rows BYTE #cols C6h unused C7h unused C8h set logical cursor relative to current position BYTE number of rows to move down (signed) BYTE number of columns to move right (signed) C9h shift top left corner of scrolling region BYTE #rows (signed) BYTE #cols (signed) CAh set window pos relative to current position BYTE number of rows to shift down (signed) BYTE number of columns to shift right (signed) CBh set window size relative to current size BYTE number of rows to expand (signed) BYTE number of cols to expand (signed) CCh shift viewport relative to current position BYTE rows to shift (signed) BYTE cols to shift (signed) CDh resize virtual screen BYTE #rows to expand (signed) BYTE #cols to expand (signed) CEh scroll text when using E8h-EBh/F8h-FBh opcodes (default) CFh scroll attributes when using E8h-EBh/F8h-FBh opcodes D0h allow window frame to extend beyond screen D1h always display a complete frame, even if window extends beyond edge of screen D2h allow DV to change colors on video mode switch (default) D3h application changes colors D4h window is visible D5h window is hidden D6h window has frame D7h window unframed D8h read characters from window (default) D9h read attributes from window DAh use logical attributes, which may be remapped attributes 1 normal text 2 highlighted normal text 3 help text 4 highlighted help text 5 error message 6 highlighted error message 7 emphasized text 8 marked text 9-16 are reverse video versions of 1-8 DBh use physical attributes for characters DCh enable special actions for control characters (default) DDh disable special control char handling, all chars displayable by BIOS TTY call DEh write both character and attribute (default) DFh write character only, leave attribute untouched E0h repeat following commands BYTE number of times E1h end of commands to repeat, start repeating them E2h set color BYTE color E3h clear virtual screen E4h redraw window E5h select menu style BYTE style bits 5,4 = 01 use two-letter menu entries for remainder of this stream E5h (panel file only) BYTE modifier bits 7,6 = 11 panel goes in new window = 01 panel uses existing window bit 5 = 1 create new keyboard in field mode bit 4 = 1 make newly-created keyboard active bit 3 reserved bit 2 = 1 stream defined exclusive input window (DV 2.2) bit 1 reserved bit 0 reserved E6h create new window and perform rest of manipulations in new window BYTE number of rows BYTE number of columns Return: DWORD object handle returned on stack at end E7h unused E8h scroll area up (top left corner defined by opcode C1h) BYTE height BYTE width E9h scroll area down (top left corner defined by opcode C1h) BYTE height BYTE width EAh scroll area left (top left corner defined by opcode C1h) BYTE height BYTE width EBh scroll area right (top left corner defined by opcode C1h) BYTE height BYTE width ECh set logical attributes for window contents BYTE video modes command applies to bit 7 monochrome bit 6 color text, EGA/VGA graphics bit 5 medium-resolution CGA graphics bit 4 high-resolution CGA graphics BYTE which attributes to set bit 7 if set, copy single following byte to indicated attrs bits 4-6 # of first attribute to change - 1 bits 0-3 # of consecutive attributes to change N BYTEs new attributes EDh set logical attributes for window frame BYTE video modes command applies to (see opcode ECh) BYTE which attributes to set bit 7 if set, copy single following byte to indicated attrs bits 4-6 # of first attribute to change - 1 bits 0-3 # of consecutive attributes to change N BYTEs new attributes attributes 1 = top left corner 2 = top right corner 3 = bottom left corner 4 = bottom right corner 5 = top edge 6 = bottom edge 7 = left edge 8 = right edge EEh set characters for window frame BYTE video modes command applies to (see opcode ECh) BYTE which characters to set bit 7 if set, copy single following byte to indicated chars bits 4-6 # of first char to change - 1 bits 0-3 # of consecutive chars to change N BYTEs new chars (same relative position as attributes above) EFh set window name BYTE length of name N BYTEs name F0h clear input field to blanks BYTE field number F1h fill input field with character BYTE field number BYTE char F2h set color of input field BYTE field number (1-N) BYTE attribute F3h set initial contents of input field BYTE field number (1-N) N BYTEs enough chars to exactly fill field as defined by op FFh F4h position cursor to specific input field BYTE field number (1-N) F5h change field table entry BYTE field number 7-8 BYTEs field table entry (see opcode FFh below) F6h set field type BYTE field number BYTE type F7h "multiple fill" write data to fields with program output bit set in field table entry, in field number order N BYTEs (total length of all program output fields) F8h scroll field up a line BYTE field number F9h scroll field down a line BYTE field number FAh scroll field left BYTE field number FBh scroll field right BYTE field number FCh set field table header BYTE number of fields BYTE screen behavior bits bit 7 reserved bit 6 set if menu items may be selected via keyboard bit 5 set if left mouse button may terminate entry bit 4 set if right mouse button may terminate entry bit 3 if set, menu fields return ' ' rather than 'Y' or 'N' bit 2 if set, modified bits reset on return to application bits 0,1 = 00 no data returned on read of keyboard 01 data returned as array of chars containing all fields packed together, with menu fields represented by the character 'Y' if selected and 'N' if not selected 10 data returned as variable-length records for all fields 11 data returned as variable-length records for the fields which were modified BYTE field in which cursor was when entry was terminated (updated by DESQview) BYTE field in which mouse was when entry was terminated (updated by DESQview) BYTE color of field currently pointed to during entry BYTE color of input fields which have been selected FDh reset modified bit for all fields FEh reset selected and modified bits for all fields FFh set up input fields 6 BYTEs table header (see opcode FCh above) the field table entries, one for each field BYTE start row \ BYTE start column \ if menu selection and start is to BYTE end row / right or below end, select from kbd only BYTE end column / BYTE field type bits 7,6 = 00 non-entry field 01 echos keystrokes input to make menu selection 10 fill-in field 11 menu selection bit 5 program output--field can be filled by F7h opcode bit 4 reserved bit 3 reserved bit 2 reserved bit 1 set if field selected bit 0 set if field modified BYTE modifier if type is fill-in, then bit flags to determine behavior bit 7 if set, beep when field is full bit 6 move to next field when current field is full bit 5 if set, enter text from right end (for numbers) bit 4 if set, force input to uppercase bit 3 if set, clear old contents on first keystroke bit 2 if set, input returned when cursor moves out of modified field (API level 2.02+) bit 1 reserved bit 0 reserved if type is menu selection, first key to press to activate 00h if have to point-&-click or is an extended-ASCII keystroke (only if two-key menus enabled) BYTE for menu item, color of field after cursor or mouse passes through it BYTE second key for activating menu selection if field type is C0h (0 = only single key). This byte is present iff two-letter menu entries selected with opcode E5h, and in that case is present regardless of field type Note: DESQview uses and updates the actual copy of the information which is contained in the stream. Thus this info must remain intact until after the data entry is complete. MODE 01h "QUERY STREAM" (valid only for those opcodes listed here) A0h return logical cursor row in next byte A1h return logical cursor column in next byte A2h return top row of scrolling region in next byte A3h return left column of scrolling region in next byte A4h return row of physical window origin in next byte A5h return column of physical window origin in next byte A6h return height of physcial window in next byte A7h return width of physical window in next byte A8h return row of viewport origin in next byte A9h return column of viewport origin in next byte AAh return height of virtual screen in next byte ABh return width of virtual screen in next byte AFh return current video mode in next byte C0h return current logical cursor position in next two bytes C1h return top left corner of scrolling region in next two bytes C2h return current window position in next two bytes C3h return current window size in next two bytes C4h return current viewport origin in next two bytes C5h return current virtual screen size in next two bytes D0h \ overwritten with D0h if frames may fall off screen edge D1h / D1h if frames always displayed entirely D2h \ overwritten with D2h if DESQview controls color palette D3h / D3h if application changes color palette D4h \ overwritten with D4h if window visible D5h / D5h if window hidden D6h \ overwritten with D6h if window has frame D7h / D7h if window unframed D8h \ overwritten with D8h if reading characters from window D9h / D9h if reading attributes from window DAh \ overwritten with DAh if using logical attributes DBh / DBh if using physical attributes DCh \ overwritten with DCh if TTY control char interpretation on DDh / DDh if TTY control char interpretation off DEh \ overwritten with DEh if writing both characters and attributes DFh / DFh if leaving attributes untouched E2h return current color in next byte ECh get logical attributes for window contents BYTE execute call if currently in specified video mode bit 7 monochrome bit 6 color text, EGA/VGA graphics bit 5 medium-resolution CGA graphics bit 4 high-resolution CGA graphics BYTE which attributes to get bit 7 unused??? bits 4-6 first attribute to get - 1 bits 0-3 # consecutive attributes N BYTEs buffer to hold attributes EDh get logical attributes for window frame BYTE execute call if currently in video mode (see opcode ECh) BYTE which attributes to get bit 7 unused??? bits 4-6 first attribute to get - 1 bits 0-3 # consecutive attributes N BYTEs buffer to hold attributes EEh get characters for window frame BYTE execute call if currently in video mode (see opcode ECh) BYTE which attributes to get bit 7 unused??? bits 4-6 first char to get - 1 bits 0-3 # consecutive chars N BYTEs buffer to hold chars EFh return current window name BYTE max length of returned name N BYTEs buffer to hold window name F3h return contents of input field BYTE field number N BYTEs buffer to hold field contents (size exactly equal to field size) F5h get field table entry BYTE field number 7-8 BYTEs buffer to hold field table entry F6h get type of a field BYTE field number BYTE type FCh get field table header 6 BYTEs buffer to store header MODE 10h "MANAGER STREAM" (valid only for opcodes listed here) 00h allow window to be moved horizontally 01h allow window to be moved vertically 02h allow window to change width 03h allow window to change height 04h allow window to be scrolled horizontally 05h allow window to be scrolled vertically 06h allow "Close Window" menu selection 07h allow window to be hidden 08h allow "Mark" menu 0Eh allow "Scissors" menu 10h allow DESQview main menu to be popped up 11h allow "Switch Windows" menu 12h allow "Open Window" menu 13h allow "Quit" menu selection 20h-33h opposite of 00h-13h, disallow specified action 40h notify if horizontal position of window changes 41h notify if vertical position of window changes 42h notify if width of window changes 43h notify if height of window changes 44h notify if window scrolled horizontally 45h notify if window scrolled vertically 46h notify if window is closed--program has to clean up and exit itself 47h notify if window is hidden 48h notify if "?" on main menu selected 49h notify if pointer message sent to window 4Ah notify if window is made active 4Bh notify if window is switched away from 4Ch notify if video mode changes 4Dh notify if "Scissors" menu "Cut" option selected 4Eh notify if "Scissors" menu "Copy" option selected 4Fh notify if "Scissors" menu "Paste" option selected 50h notify if DESQview main menu popped up 51h notify if DESQview main menu popped down 60h-71h opposite of 40h-51h: don't notify on specified event 84h attach window to parent task's window (both move together) 85h detach window from parent task's window (may move independently) 86h disable background operation 87h enable running in background 88h set minimum size of physical window BYTE rows BYTE columns 89h set maximum size of physical window BYTE rows BYTE cols 8Ah set primary asynchronous notification routine DWORD address of routine, 0000h:0000h means none on entry ES:DI = handle of window, DS:SI is 32-bit value set by 8Bh opcode mailbox contains message indicating event Opcode 40h horizontal movement DWORD object handle of window BYTE new row BYTE new col 41h vertical movement DWORD object handle of window BYTE new row BYTE new col 42h horizontal size change DWORD object handle of window BYTE new rows BYTE new cols 43h vertical size change DWORD object handle of window BYTE new rows BYTE new cols 44h scrolled horizontally DWORD object handle of window BYTE mouse row within window BYTE mouse column within window BYTE field mouse is on, 0 if none BYTE amount moved: >0 right, <0 left, 0 done 45h scrolled vertically DWORD object hande of window BYTE mouse row within window BYTE mouse column within window BYTE field mouse is on, 0 if none BYTE amount moved: >0 down, <0 up, 0 done 46h window closed DWORD object handle of window BYTE mouse pointer row BYTE mouse pointer column BYTE field mouse is on, 0 if none 47h window hidden 48h Help for Program selected DWORD object handle of window BYTE mouse pointer row BYTE mouse pointer column BYTE field mouse is on, 0 if none 49h pointer message sent to window 4Ah switched to window from another ("raise") 4Bh switched away from the window ("lower") 4Ch video mode changed BYTE new video mode 4Dh Scissors/cUt selected DWORD object handle of window BYTE row of upper left corner BYTE column of upper left corner BYTE field number ul corner is in, 0=none DWORD handle of orphaned window created to hold data BYTE height of region BYTE width of region 4Eh Scissors/Copy selected DWORD object handle of window BYTE row of upper left corner BYTE column of upper left corner BYTE field number ul corner is in, 0=none DWORD handle of orphaned window created to hold data BYTE height of region BYTE width of region 4Fh Scissors/Paste selected DWORD object handle of window BYTE row of upper left corner BYTE column of upper left corner BYTE field number ul corner is in, 0=none DWORD handle of orphaned window with data BYTE height of region BYTE width of region 50h main menu popped up 51h main menu popped down routine should restore all registers before returning 8Bh set async notification parameter DWORD 32-bit value passed to async routine in DS:SI ACh (DV2.2) perform regular select field attribute processing ADh (DV2.2) protect attributes in selected field from being lost AEh make window default notify window for owning app (API level 2.00+) AFh set selected field marker character BYTE character to display at left edge of selected fields BCh set standard field processing mode BDh set alternate field processing mode (enables cursor pad for menus) BEh enables changing reverse logical attributes with ECh opcode BFh disables changing reverse logical attributes with ECh opcode C0h make current window topmost in system C1h force current process into foreground C2h make current window topmost in process C3h position mouse pointer relative to origin of current field BYTE rows below upper left corner of field BYTE columns to right of upper left corner of field C4h position mouse pointer relative to origin of given field BYTE field number BYTE rows below upper left corner of field BYTE columns to right of upper left corner of field C5h hide current window C6h show windows for this process C7h hide all windows for this process C8h suspend process and hide all its windows C9h force current process into background CAh make current window bottom-most in process CBh cancel current window manager operation, remove DV menu, give control to topmost application CCh close window CEh reorder windows DWORD pointer to null-terminated list of words each word is segment of object handle for a window MODES 14h to 1Fh "USER STREAMS" normally NOPs, but may be defined by SETESC message to invoke FAR routines, one for each mode number on entry to handler, DS:SI = first byte of actual stream (not header) CX = #bytes in stream ES:DI = window's handle --------------------------------------------- INT 15 - DESQview 2.2 - SEND MESSAGE - SET PRIORITY AH = 12h BH = 06h BL = object 00h object handle in DWORD on top of stack STACK: DWORD new priority of object in task's OBJECTQ --------------------------------------------- INT 15 - DESQview 2.2 - SEND MESSAGE - GET PRIORITY AH = 12h BH = 07h BL = object 00h object handle in DWORD on top of stack Return: STACK: DWORD object priority Note: initially all objects have the same default value. Should make relative adjustments to this default value. --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "SIZEOF" - GET OBJECT SIZE AH = 12h BH = 08h BL = object 00h handle in DWORD on top of stack timer: elapsed time since timer started pointer: number of messages queued to pointer object panel: number of panels in panel file 01h total chars in current task's default window 02h number of messages in task's mailbox (task's handle on stack) 03h number of messages in current task's mailbox 04h number of input buffers queued in task's kbd (handle on stack) 05h number of input buffers queued for current task's default kbd 06h number of objects queued in OBJECTQ (task's handle on stack) 07h number of objects queued in current task's OBJECTQ Return: DWORD on stack is result --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "LEN" - GET OBJECT LENGTH AH = 12h BH = 09h BL = object 00h handle in DWORD on top of stack window: chars/line timer: timer remaining before timer expires 01h number of chars/line in current task's default window Return: DWORD on top of stack is length --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "ADDTO" - SET OBJECT BITS AH = 12h BH = 0Ah BL = object 00h handle is DWORD on top of stack window: write characters and attributes timer: start timer for specified interval pointer: set control flags 01h write characters and attributes to task's default window 02h send message/status by value to mailbox (task's handle on stack) 03h send message/status by value to current task's default mailbox 04h set control flags on KEYBOARD object (handle on top of stack) 05h set control flags on task's default KEYBOARD object STACK: (if mailbox) DWORD status DWORD length of message DWORD address (if timer) DWORD duration in 1/100 seconds (if window) DWORD count of characters DWORD address of characters DWORD count of attributes DWORD address of attributes (otherwise) DWORD bits to set For keyboard objects, the bits have the following significance: bit 15 reserved, can't be set bit 14 unused bit 13 reserved, can't be set bit 12-5 unused bit 4 filter all keys (used with handler established by SETESC) bit 3 program continues executing while input in progress bit 2 insert mode active bit 1 keyboard is active bit 0 keyboard is in field mode For pointer objects, the bits have the following significance: bit 15 reserved, can't be set bit 14-8 unused bit 7 mouse pointer is hidden while in window bit 6 get messages even if window not topmost bit 5 get messages even if window not foreground bit 4 mouse button must be held 1/2 second before it "clicks" bit 3 pointer position is relative to screen origin, not window origin bit 2 send message on button release as well as button press bit 1 unused??? bit 0 send message only on button activity, not movement DV-specific, and INT 15h/AX=DE0Fh must have been called first --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "SUBFROM" - RESET OBJECT BITS AH = 12h BH = 0Bh BL = object 00h handle is DWORD on top of stack window: write attributes only mailbox: send message by reference pointer: reset control flags 01h write attributes only to task's default window 02h send msg/status by reference to mailbox (task's handle on stack) 03h send msg/status by reference to current task's mailbox 04h clear control flags on KEYBOARD object (handle on top of stack) 05h clear control flags on task's default KEYBOARD object 06h remove specific object from OBJECTQ (task's handle on stack) 07h remove specific object from task's default OBJECTQ STACK: (if mailbox) DWORD status DWORD length DWORD address (if window) DWORD number of attributes to write DWORD address of attributes (if objectq) DWORD handle of object to remove (otherwise) DWORD indicates which bits to clear --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "OPEN" - OPEN OBJECT AH = 12h BH = 0Ch BL = object 00h handle is DWORD on top of stack window: fill with given character keyboard: attach to a window timer: open pointer: start taking input for window panel: associate with a panel file 01h fill task's default window with given character 02h open given task's mailbox for input (task's handle on stack) 03h open current task's mailbox 04h attach a KEYBOARD to a window (handle on top of stack) 05h attach task's default KEYBOARD to a window 06h open a task's OBJECTQ (task's handle on top of stack) 07h open current task's OBJECTQ STACK: (if window) DWORD character to fill with (if keyboard) DWORD handle of window to attach to (if pointer) DWORD handle of window to attach to (if panel) DWORD length of filename DWORD address of filename (otherwise) nothing Notes: special action taken if first byte of panel file name is 1Bh if first two bytes of panel file "name" are C0hC3h, then the "name" IS the panel file result code of open may be retrieved with STATUS message --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "CLOSE" - CLOSE OBJECT AH = 12h BH = 0Dh BL = object 00h handle is DWORD on top of stack timer: close keyboard: detach from window pointer: stop taking input panel: close 02h close given task's mailbox (task's handle on top of stack) 03h close task's default mailbox 04h close KEYBOARD object (handle on top of stack) 05h close task's default KEYBOARD 06h close givent task's OBJECTQ (task's handle on top of stack) 07h close current task's OBJECTQ --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "ERASE" - ERASE OBJECT AH = 12h BH = 0Eh BL = object 00h handle is DWORD on top of stack window: clear keyboard: discard input timer: cancel current interval pointer: discard all pending messages 01h clear task's default window 02h discard all queued messages in mailbox (handle on top of stack) 03h discard all queued messages in current task's default mailbox 04h discard all input queued to KEYBOARD (handle on top of stack) 05h discard all input queued to task's default KEYBOARD 06h remove all objects from OBJECTQ (task's handle on top of stack) 07h remove all objects from current task's OBJECTQ --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "STATUS" - GET OBJECT STATUS AH = 12h BH = 0Fh BL = object 00h handle is DWORD on top of stack timer: is it running? pointer: return status of last message panel: verify success of last OPEN or APPLY 02h return status of last msg READ from mailbox (handle on stack) 03h return status of last msg READ from task's default mailbox 04h get status of last msg from task's KEYBOARD (task handle on stk) 05h get status of last msg from task's default KEYBOARD 06h return whether OBJECTQ is open or not (handle on top of stack) 07h return whether task's default OBJECTQ is open or not Return: DWORD on top of stack is status Note: if object is a panel object, the status indicates the error code: 14h panel name not in panel directory 15h not enough memory to apply panel 16h invalid panel format 17h panel file already open 81h-92h DOS error codes+80h 95h not enough memory to open panel file 98h null panel file name --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "EOF" - GET OBJECT EOF STATUS AH = 12h BH = 10h BL = object 00h handle is DWORD on top of stack 01h returns TRUE if logical cursor past end of task's def window 02h return ??? for task's mailbox (task's handle on top of stack) 03h return ??? for current task's mailbox Return: DWORD on top of stack is status --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "AT" - POSITION OBJECT CURSOR AH = 12h BH = 11h BL = object 00h window's handle is DWORD on top of stack 01h position logical cursor on task's default window STACK: DWORD column DWORD row --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "SETNAME" - ASSIGN NAME TO MAILBOX AH = 12h BH = 11h BL = mailbox to name 00h DWORD on top of stack is mailbox handle 02h use given task's mailbox (task's handle on top of stack) 03h use current task's default mailbox STACK: DWORD length of name DWORD address of name --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "SETSCALE" - SET POINTER SCALE FACTOR AH = 12h BX = 1100h STACK: DWORD object handle for pointer object DWORD number of colums to scale pointer position to DWORD number of rows to scale pointer position to --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "READN" - GET NEXT N OBJECT BYTES AH = 12h BH = 12h BL = object 00h handle is DWORD on top of stack 01h read next N chars/attributes on task's default window STACK: DWORD count Return: STACK: DWORD width of screen line DWORD address DWORD count actually read --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "GETSCALE" - GET POINTER SCALE FACTOR AH = 12h BX = 1200h STACK: DWORD object handle for pointer Return: STACK: DWORD pointer pos scaled as if window were this many colums wide DWORD pointer pos scaled as if window were this many rows high --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "REDRAW" - REDRAW WINDOW AH = 12h BH = 13h BL = window object 00h DWORD on top of stack is handle for window to redraw 01h redraw task's default window --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "SETICON" - SPECIFY POINTER ICON AH = 12h BX = 1300h STACK: DWORD object handle for pointer DWORD character to use for pointer --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "SETESC" - SET ESCAPE ROUTINE ADDRESS AH = 12h BH = 14h BL = message modifier 00h handle is DWORD on top of stack 01h define user stream 04h intercept keystrokes from KEYBOARD to a window (handle on stack) 05h intercept keystrokes from task's default KEYBOARD to a window STACK: (if window) DWORD user stream number (14h-1Fh) DWORD address of FAR user stream handler (if keyboard) DWORD address of FAR filter function The keyboard filter function is called when the keyboard is in field mode. On entry, AL = character AH = 00h or extended ASCII code if AL = 00h BL = field number CH = cursor column CL = cursor row DL = field type modifier (sixth item in field table entry) DH = ??? (seventh item in field table entry) ES:SI = window's handle (also, in DV 2.00, DS:DI points to the field table entry. This may change in other versions) The filter function should return AH = 00h use keystroke 01h ignore keystroke >1 beep and ignore keystroke --------------------------------------------- INT 15 - TopView - SEND MESSAGE - "LOCK" - REQUEST EXCLUSIVE ACCESS TO RESOURCE AH = 12h BH = 14h BL = object 00h mailbox handle is DWORD on top of stack 02h use given task's mailbox (task's handle on top of stack) 03h use current task's default mailbox Note: release exclusive access by sending CLOSE message to mailbox access may be requested multiple times, and requires multiple CLOSEs --------------------------------------------- INT 15 - DESQview 2.2 - SEND MESSAGE - SET FLAGS AH = 12h BH = 15h BL = object 00h DWORD on top of stack mailbox, keyboard, or pointer only 02h mailbox for task whose handle is on top of stack 03h mailbox for current task 04h keyboard for task whose handle is on top of stack 05h keyboard for current task STACK: DWORD flags if mailbox: bit 0: all mail messages in common memory bit 1: allow write even if closed bit 2: don't erase messages when mailbox closed if keyboard: bit 5: exclusive input when keyboard in use for input Return: nothing Note: this call is only available if the API level has been set to at least 2.2 --------------------------------------------- INT 15 - DESQview 2.2 - SEND MESSAGE - GET FLAGS AH = 12h BH = 16h BL = object 00h DWORD on top of stack mailbox, keyboard, or pointer only 02h mailbox for task whose handle is on top of stack 03h mailbox for current task 04h keyboard for task whose handle is on top of stack 05h keyboard for current task Return: STACK: DWORD current control flags Note: this call is only available if the API level has been set to at least 2.2 --------------------------------------------- INT 15 - VMiX - WAKE PROCESS AH = 13h STACK: WORD process ID Return: AX = status --------------------------------------------- INT 15 - VMiX - CLEAR WINDOW AH = 14h STACK: WORD top left corner of window WORD bottom right corner of window Return: AX = status --------------------------------------------- INT 15 - VMiX - SET BANNER WINDOW MESSAGE AH = 15h STACK: DWORD pointer to ASCIZ banner message Return: AX = status --------------------------------------------- INT 15 - VMiX - SET ROOT WINDOW SIZE AND HOME CURSOR AH = 16h STACK: DWORD pointer to I/O Request Packet WORD top left corner of window WORD bottom right corner of window Return: AX = status --------------------------------------------- INT 15 - VMiX - GET CONSOLE WINDOW COLORS AH = 17h Return: AH = foreground color AL = background color --------------------------------------------- INT 15 - VMiX - SET CONSOLE COLORS AH = 18h STACK: WORD new background/foreground colors Return: AX = color --------------------------------------------- INT 15 - VMiX v2+ - ??? AH = 19h STACK: WORD ??? Return: ??? --------------------------------------------- INT 15 - VMiX v2+ - ??? AH = 1Ah STACK: 3 WORDs ??? Return: ??? --------------------------------------------- INT 15 - VMiX v2+ - ??? AH = 1Bh STACK: 5 WORDs ??? Return: ??? --------------------------------------------- INT 15 - VMiX v2+ - ??? AH = 1Ch STACK: 5 WORDs ??? Return: ??? --------------------------------------------- INT 15 - VMiX v2+ - ??? AH = 1Dh ??? Return: ??? --------------------------------------------- INT 15 - VMiX v2+ - ??? AH = 1Eh STACK: WORD ??? Return: ??? --------------------------------------------- INT 15 - DOS 3.10 PRINT.COM - DISABLE CRITICAL REGION FLAG (AT,XT286,PS50+) AX = 2000h --------------------------------------------- INT 15 - DOS 3.10 PRINT.COM - SET CRITICAL REGION FLAG (AT,XT286,PS50+) AX = 2001h ES:BX -> byte which is to be incremented while in a DOS call --------------------------------------------- INT 15 - OS HOOK - SETUP SYSREQ ROUTINE (AT,XT286,PS50+) AX = 2010h ??? Return: ??? --------------------------------------------- INT 15 - OS HOOK - COMPLETION OF SYSREQ FUNCTION (AT,XT286,PS50+) AX = 2011h ??? Return: ??? --------------------------------------------- INT 15 - SYSTEM - POWER-ON SELF-TEST ERROR LOG (PS50+) AH = 21h AL = subfunction 00h read POST log 01h write POST log BH = device ID BL = error code Return: CF set on error AH = status (00h OK, 01h list full, 80h invalid cmd, 86h unsupported) if function 00h: BX = number of error codes stored ES:DI -> error log Note: the log is a series of words, the first byte of which identifies the error code and the second the device. --------------------------------------------- INT 15 - SYSTEM - READ/MODIFY PROFILES (CONVERTIBLE) AH = 40h AL = subfunction 00h get system profile in CX and BX 01h set system profile from CX and BX 02h get internal modem profile in BX 03h set internal modem profile from BX --------------------------------------------- INT 15 - SYSTEM - WAIT ON EXTERNAL EVENT (CONVERTIBLE) AH = 41h AL = condition type bits 0-2: condition to wait for 0 any external event 1 compare and return if equal 2 compare and return if not equal 3 test and return if not zero 4 test and return if zero bit 3: reserved bit 4: 1=port address, 0=user byte bits 5-7: reserved BH = condition compare or mask value BL = timeout value times 55 milliseconds 00h means no timeout DX = I/O port address if AL bit 4 set ES:DI -> user byte if AL bit 4 clear --------------------------------------------- INT 15 - SYSTEM - REQUEST POWER OFF (CONVERTIBLE) AH = 42h AL = 00h to use system profile 01h to force suspend regardless of system profile --------------------------------------------- INT 15 - SYSTEM - READ SYSTEM STATUS (CONVERTIBLE) AH = 43h Return: AL = status bits bit 0: LCD detached bit 1: reserved bit 2: RS232/parallel adapter powered on bit 3: internal modem powered on bit 4: power activated by alarm bit 5: standby power lost bit 6: external power in use bit 7: power low --------------------------------------------- INT 15 - SYSTEM - (DE)ACTIVATE INTERNAL MODEM POWER (CONVERTIBLE) AH = 44h AL = 00h to power off 01h to power on --------------------------------------------- INT 15 - OS HOOK - KEYBOARD INTERCEPT (AT model 3x9,XT2,XT286,CONV,PS) AH = 4Fh AL = scan code CF set Return: CF set AL = scan code CF clear scan code should be ignored Note: Called by INT 9 handler to translate scan codes --------------------------------------------- INT 15 - OS HOOK - DEVICE OPEN (AT,XT2,XT286,PS) AH = 80h BX = device ID CX = process type Return: CF set on error AH = status --------------------------------------------- INT 15 - OS HOOK - DEVICE CLOSE (AT,XT2,XT286,PS) AH = 81h BX = device ID CX = process type Return: CF set on error AH = status --------------------------------------------- INT 15 - OS HOOK - DEVICE PROGRAM TERMINATE (AT,XT2,XT286,PS) AH = 82h BX = device ID Return: CF set on error AH = status Note: closes all devices opened with function 80h --------------------------------------------- INT 15 - SYSTEM - EVENT WAIT (AT,XT286,CONV,PS) AH = 83h AL = subservice 00h = set interval 01h = cancel ES:BX -> event flag (bit 7 set when interval expires) CX:DX = number of microseconds to wait (only accurate to 977 us) Return: CF set if function already busy --------------------------------------------- INT 15 - SYSTEM - READ JOYSTICK (AT,XT2,XT286,PS) AH = 84h DX = subservice 0000h get switch settings Return: AL = switch settings (bits 7-4) 0001h read joystick inputs Return: AX = A(x) value BX = A(y) value CX = B(x) value DX = B(y) value --------------------------------------------- INT 15 - OS HOOK - SYSTEM REQUEST KEY PRESSED (AT,XT2,XT286,CONV,PS) AH = 85h AL = 00h press = 01h release Return: CF set on error AH = status Note: called by keyboard decode routine --------------------------------------------- INT 15 - SYSTEM - WAIT (AT,XT2,XT286,CONV,PS) AH = 86h CX,DX = number of microseconds to wait (only accurate to 977 us) Return: CF clear: after wait elapses CF set: immediately due to error --------------------------------------------- INT 15 - EXTENDED MEMORY - BLOCK MOVE (AT,XT286,PS) AH = 87h CX = number of words to move ES:SI -> global descriptor table (see below) Return: CF set on error AH = status 00h source copied into destination 01h parity error 02h interrupt error 03h address line 20 gating failed Format of global descriptor table: Offset Size Description 00h 16 BYTEs zeros 10h WORD source segment length in bytes (2*CX-1 or greater) 12h 3 BYTEs 24-bit linear source address, low byte first 15h BYTE source segment access rights (93h) 16h WORD zero 18h WORD destination segment length in bytes (2*CX-1 or greater) 1Ah 3 BYTEs 24-bit linear destination address, low byte first 1Dh BYTE destination segment access rights (93h) 1Eh 18 BYTEs zeros --------------------------------------------- INT 15 - EXTENDED MEMORY - GET MEMORY SIZE (AT,XT286,PS) AH = 88h Return: AX = memory size in K --------------------------------------------- INT 15 - SYSTEM - SWITCH TO VIRTUAL MODE (AT,XT286,PS50+) AH = 89h BL = interrupt number of IRQ0 (IRQ1-7 use next 7 interrupts) BH = interrupt number of IRQ8 (IRQ9-F use next 7 interrupts) DS:SI -> GDT for protected mode offset 0h null descriptor 8h GDT descriptor 10h IDT descriptor 18h DS 20h ES 28h SS 30h CS 38h uninitialized, used to build descriptor for BIOS CS CX = offset into protected-mode CS to jump to Return: CF set on error AH = 0FFh error enabling address line 20 --------------------------------------------- INT 15 - OS HOOK - DEVICE BUSY LOOP (AT,XT2,XT286,CONV,PS) AH = 90h AL = type code 00h disk 01h diskette 02h keyboard 03h PS/2 pointing device 80h network FCh disk reset FDh diskette motor start FEh printer ES:BX -> request block for type codes 80h through BFh Return: CF set if wait time satisfied CF clear if driver must perform wait Note: type codes are allocated as follows: 00-7F non-reentrant devices; OS must arbitrate access 80-BF reentrant devices; ES:BX points to a unique control block C0-FF wait-only calls, no complementary INT 15/AH=91h call --------------------------------------------- INT 15 - OS HOOK - SET FLAG AND COMPLETE INTERRUPT (AT,XT2,XT286,CONV,PS) AH = 91h AL = type code (see AH=90h) ES:BX -> request block for type codes 80h through BFh Return: AH = 00h --------------------------------------------- INT 15 - SYSTEM - GET CONFIGURATION (XT after 1/10/86,AT mdl 3x9,CONV,XT286,PS) AH = C0h Return: CF set if BIOS doesn't support call CF clear on success ES:BX -> ROM table (see below) Note: the 1/10/86 XT BIOS returns an incorrect value for the feature byte Format of ROM configuration table: Offset Size Description 00h WORD number of bytes following 02h BYTE model: PC=FFh, XT=FEh or FBh, PCjr = FDh, PS/2=F8h 03h BYTE submodel: distingushes between AT and XT/286, etc. 04h BYTE BIOS revision: 0 for first release, 1 for 2nd, etc. 05h BYTE features: bit 7 = DMA channel 3 used by hard disk BIOS bit 6 = 2nd 8259 installed bit 5 = Real-Time Clock installed bit 4 = INT 15h/AH=4Fh called upon INT 9h bit 3 = wait for external event supported bit 2 = extended BIOS area allocated at 640K bit 1 = bus is Micro Channel instead of ISA bit 0 reserved 06h WORD reserved (0) 08h WORD reserved (0) --------------------------------------------- INT 15 - SYSTEM - RETURN EXTENDED-BIOS DATA-AREA SEGMENT ADDRESS (PS) AH = C1h Return: CF set on error CF clear if successful ES = segment of data area --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - ENABLE/DISABLE AX = C200h BH = 00h disable 01h enable Return: CF set on error AH = status 00h successful 01h invalid function 02h invalid input 03h interface error 04h need to resend 05h no device handler installed --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - RESET AX = C201h Return: CF set on error AH = status (see AX=C200h) CF clear if successful BH = device ID --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - SET SAMPLING RATE AX = C202h BH = sampling rate 00h 10/second 01h 20/second 02h 40/second 03h 60/second 04h 80/second 05h 100/second 06h 200/second Return: CF set on error AH = status (see AX=C200h) --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - SET RESOLUTION AX = C203h BH = resolution 00h one count per mm 01h two counts per mm 02h four counts per mm 03h eight counts per mm Return: CF set on error AH = status (see AX=C200h) --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - GET TYPE AX = C204h Return: CF set on error AH = status (see AX=C200h) CF clear if successful BH = device ID --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - INITIALIZE AX = C205h BH = data package size (1 - 8 bytes) Return: CF set on error AH = status (see AX=C200h) --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - GET/SET SCALING FACTOR AX = C206h BH = subfunction 00h return device status Return: BL = status bit 0: right button pressed bit 1: reserved bit 2: left button pressed bit 3: reserved bit 4: 0 if 1:1 scaling, 1 if 2:1 scaling bit 5: device enabled bit 6: 0 if stream mode, 1 if remote mode bit 7: reserved CL = resolution (see AX=C203h) DL = sample rate, reports per second 01h set scaling at 1:1 02h set scaling at 2:1 Return: CF set on error AH = status (see AX=C200h) --------------------------------------------- INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - SET DEVICE HANDLER ADDR AX = C207h ES:BX = user device handler Return: CF set on error AH = status (see AX=C200h) -------------------------------------------- INT 15 - SYSTEM - ENABLE/DISABLE WATCHDOG TIMEOUT (PS50+) AH = C3h AL = 00h disable 01h enable BX = timer counter Return: CF set on error Note: the watchdog timer generates an NMI --------------------------------------------- INT 15 - SYSTEM - PROGRAMMABLE OPTION SELECT (PS50+) AH = C4h AL = 00h return base POS register address 01h enable slot BL = slot number 02h enable adapter Return: CF set on error DX = base POS register address (if function 00h) --------------------------------------------- INT 15 - DESQview - GET PROGRAM NAME AX = DE00h Return: AX = offset into DESQVIEW.DVO of current program's record (see below) Format of program entry in DESQVIEW.DVO: Offset Size Description 00h BYTE length of name 01h N BYTEs name 2 BYTEs keys to invoke program (second = 00h if only one key used) WORD ??? seems always to be 0000h BYTE end flag: 00h for all but last entry, which is FFh --------------------------------------------- INT 15 - DESQview - UPDATE "OPEN WINDOW" MENU AX = DE01h Return: nothing Note: reads DESQVIEW.DVO, disables Open menu if file not in current directory --------------------------------------------- INT 15 - DESQview 1.x only - SET ??? FLAG FOR CURRENT WINDOW AX = DE02h Return: nothing Note: this call is a NOP in DV 2.x --------------------------------------------- INT 15 - DESQview 1.x only - GET ??? FOR CURRENT WINDOW AX = DE03h Return: AX = ??? for current window BX = ??? for current window Note: this call is a NOP in DV 2.x --------------------------------------------- INT 15 - DESQview - GET AVAILABLE COMMON MEMORY AX = DE04h Return: BX = bytes of common memory available CX = largest block available DX = total common memory in bytes --------------------------------------------- INT 15 - DESQview - GET AVAILABLE CONVENTIONAL MEMORY AX = DE05h Return: BX = K of memory available CX = largest block available DX = total conventional memory in K --------------------------------------------- INT 15 - DESQview - GET AVAILABLE EXPANDED MEMORY AX = DE06h Return: BX = K of expanded memory available CX = largest block available DX = total expanded memory in K --------------------------------------------- INT 15 - DESQview - "APPNUM" - GET CURRENT PROGRAM'S NUMBER AX = DE07h Return: AX = number of program as it appears on the "Switch Windows" menu --------------------------------------------- INT 15 - DESQview - GET ??? AX = DE08h Return: AX = 0000h if ??? is not set to the current task 0001h if ??? is set to the current task --------------------------------------------- INT 15 - DESQview - UNIMPLEMENTED AX = DE09h Return: nothing (NOP in DV 1.x and 2.x) --------------------------------------------- INT 15 - DESQview 2.x - "DBGPOKE" - DISPLAY CHARACTER ON STATUS LINE AX = DE0Ah BL = character Return: character displayed, next call will display in next position (which wraps back to the start of the line if off the right edge of screen) Notes: displays character on bottom line of *physical* screen, regardless of current size of window (even entirely hidden) does not know about graphics display modes, just pokes the characters into display memory --------------------------------------------- INT 15 - DESQview 2.x - "APILEVEL" - DEFINE MINIMUM API LEVEL REQUIRED AX = DE0Bh BL = API level major version number BH = API level minor version number Return: AX = maximum API level (AL = major, AH = minor) Note: if the requested API level is greater than the version of DESQview, a "You need a newer version" error window is popped up --------------------------------------------- INT 15 - DESQview 2.x - "GETMEM" - ALLOCATE "SYSTEM" MEMORY AX = DE0Ch BX = number of bytes Return: ES:DI -> allocated block --------------------------------------------- INT 15 - DESQview 2.x - "PUTMEM" - DEALLOCATE "SYSTEM" MEMORY AX = DE0Dh ES:DI -> previously allocated block Return: nothing --------------------------------------------- INT 15 - DESQview 2.x - FIND MAILBOX BY NAME AX = DE0Eh ES:DI -> name to find CX = length of name Return: BX = 0000h not found 0001h found DS:SI = object handle --------------------------------------------- INT 15 - DESQview 2.x - ENABLE DESQview EXTENSIONS AX = DE0Fh Return: AX and BX destroyed (seems to be bug, weren't saved&restored) Notes: sends a manager stream with opcodes AEh, BDh, and BFh to task's window enables an additional mouse mode --------------------------------------------- INT 15 - DESQview 2.x - "PUSHKEY" - PUT KEY INTO KEYBOARD INPUT STREAM AX = DE10h BH = scan code BL = character Return: nothing Note: a later read will get the keystroke as if it had been typed by the user early copies of DV 2.00 destroy AX, BX, ES, and DI --------------------------------------------- INT 15 - DESQview 2.x - ENABLE/DISABLE AUTOMATIC JUSTIFICATION OF WINDOW AX = DE11h BL = 00h viewport will not move automatically nonzero viewport will move to keep cursor visible Return: nothing --------------------------------------------- INT 15 - DESQview 2.01+ - SET ??? AX = DE12h BX = 0000h clear ??? flag nonzero set ??? flag Return: nothing --------------------------------------------- INT 15 - DESQview 2.2 - GET CRITICAL NESTING COUNT AX = DE13h Return: BX = number of calls to BEGINC (see INT 15/AX=101Bh) without matching ENDC (see INT 15/AX=101Ch) --------------------------------------------- INT 15 - DESQview 2.2 - GET OBJECT TYPE AX = DE14h ES:DI -> object Return: BL = 00h not an object 08h window or task 09h mailbox 0Ah keyboard 0Bh timer 0Ch objectq 0Fh pointer 10h panel --------------------------------------------- INT 15 - DESQview 2.2 - SET MAILBOX ERROR HANDLING AX = DE15h BL = 00h post system error on conditions listed below 01h return carry flag set on calls to ADDTO, SUBFROM, and WRITE messages sent to mailboxes which fail due to lack of system or common memory Return: nothing --------------------------------------------- INT 15 - DESQview 2.2 - GET MAILBOX ERROR HANDLING AX = DE16h Return: BL = 00h post system error 01h return carry flag set --------------------------------------------- INT 15 - DESQview 2.2 - reserved AX = DE17h Return: pops up "Programming error" window Note: AX = 1117h is NOT identical to this call --------------------------------------------- INT 15 - DESQview 2.2 - ??? AX = DE18h Note: calls video driver (NOP for Hercules driver) --------------------------------------------- INT 16 - KEYBOARD - READ CHAR FROM BUFFER, WAIT IF EMPTY AH = 00h Return: AH = scan code AL = character --------------------------------------------- INT 16 - KEYBOARD - CHECK BUFFER, DO NOT CLEAR AH = 01h Return: ZF clear if character in buffer AH = scan code AL = character ZF set if no character in buffer --------------------------------------------- INT 16 - KEYBOARD - GET SHIFT STATUS AH = 02h AL = shift status bits 0 = right shift key depressed 1 = left shift key depressed 2 = CTRL depressed 3 = ALT depressed 4 = SCROLL LOCK active 5 = NUM LOCK active 6 = CAPS LOCK active 7 = INSERT state active --------------------------------------------- INT 16 - KEYBOARD - SET DELAYS (Jr,AT model 339,XT286,PS) AH = 03h AL = subfunction 00h reset typematic (PCjr) 01h increase initial delay (PCjr) 02h increase continuing delay (PCjr) 03h increase both delays (PCjr) 04h turn off typematic (PCjr) 05h Set typematic rate (AT or PS/2) BH = 00h - 03h for delays of 250ms, 500ms, 750ms, or 1s BL = 00h - 1Fh for typematic rates of 30cps down to 2cps --------------------------------------------- INT 16 - KEYBOARD - KEYCLICK (Jr,CONV) AH = 04h AL = 00h click off 01h click on --------------------------------------------- INT 16 - KEYBOARD - WRITE TO KEYBOARD BUFFER (AT model 339,XT2,XT286,PS) AH = 05h CH = scan code CL = character Return: AL = 1 if buffer full --------------------------------------------- INT 16 - KEYBOARD - GET ENHANCED KEYSTROKE (AT model 339,XT2,XT286,PS) AH = 10h Return: AH = scan code AL = character --------------------------------------------- INT 16 - KEYBOARD - CHECK ENHANCED KEYSTROKE (AT model 339,XT2,XT286,PS) AH = 11h Return: ZF clear if keystroke available AH = scan code \ meaningless if ZF = 1 AL = character / ZF set if kbd buffer empty --------------------------------------------- INT 16 - KEYBOARD - GET ENHANCED SHIFT FLAGS (AT model 339,XT2,XT286,PS) AH = 12h Return: AL = shift flags (same as for AH=02h) bit 7: Ins ON bit 6: CapsLock ON bit 5: NumLock ON bit 4: ScrollLock ON bit 3: Either ALT key down bit 2: Either CTRL key down bit 1: Left shift key down bit 0: Right shift key down AH bit 7: SysReq key down bit 6: CapsLock key down bit 5: NumLock key down bit 4: ScrollLock key down bit 3: Right Alt key down bit 2: Right Ctrl key down bit 1: Left Alt key down bit 0: Right Alt key down --------------------------------------------- INT 16 - PC Tools v5.1 BACKTALK - UNHOOK AX = 6969h BX = 6968h Return: resident code unhooked, but not removed from memory --------------------------------------------- INT 16 - PC Tools v5.1 BACKTALK - INSTALLATION CHECK AX = 6969h BX = 6969h DX = 0000h Return: DX nonzero if installed BX = CS of resident code DS:SI -> ASCIZ identification string "CPoint Talk" --------------------------------------------- INT 16 - FAKEY.COM - INSTALLATION CHECK AH = 70h Return: AX = 1954h if installed Note: FAKEY is a keystroke faking utility by System Enhancement Associates --------------------------------------------- INT 16 - FAKEY.COM - PUSH KEYSTROKES AH = 71h CX = number of keystrokes DS:SI -> array of words containing keystrokes to be returned by AH=00h Note: FAKEY is a keystroke faking utility by System Enhancement Associates --------------------------------------------- INT 16 - FAKEY.COM - CLEAR FAKED KEYSTROKES AH = 72h Note: FAKEY is a keystroke faking utility by System Enhancement Associates --------------------------------------------- INT 16 - FAKEY.COM - PLAY TONES AH = 73h CX = number of tones to play DS:SI -> array of tones (see below) Note: FAKEY is a keystroke faking utility by System Enhancement Associates Format of tone array entries: Offset Size Description 00h WORD divisor for timer channel 2 02h WORD duration in clock ticks --------------------------------------------- INT 16 - pcANYWHERE - SET TICK COUNT FOR SCANNING AH = 75h AL = number of ticks between checks for new screen changes --------------------------------------------- INT 16 - pcANYWHERE - SET ERROR CHECKING TYPE AH = 76h AL = error checking type 00h none 01h fast 02h slow --------------------------------------------- INT 16 - pcANYWHERE - LOG OFF AH = 77h AL = mode 00h wait for another call 01h leave in Memory Resident Mode 02h leave in Automatic Mode FFh leave in current operating mode --------------------------------------------- INT 16 - WATCH.COM - INSTALLATION CHECK AX = 7761h ('wa') Return: AX = 5741h ('WA') if installed Note: WATCH.COM is part of the "TSR" package by Kim Kokkonen --------------------------------------------- INT 16 - PC Magazine PUSHDIR.COM - INSTALLATION CHECK AX = 7788h BX = 7789h Return: AX = 7789h BX = 7788h DS:SI -> signature string --------------------------------------------- INT 16 - pcANYWHERE - CHECK STATUS AH = 79h Return: AX = status FFFFh if resident and active FFFEh if resident but not active FFFDh if in Memory Resident mode FFFCh if in Automatic mode other value if not resident --------------------------------------------- INT 16 - pcANYWHERE - CANCEL SESSION AH = 7Ah --------------------------------------------- INT 16 - pcANYWHERE - SUSPEND AX = 7B00h --------------------------------------------- INT 16 - pcANYWHERE - RESUME AX = 7B01h --------------------------------------------- INT 16 - pcANYWHERE - GET PORT CONFIGURATION AH = 7Ch Return: AH = port number AL = baud rate 00h = 50 baud 01h = 75 baud 02h = 110 baud 03h = 134.5 baud 04h = 150 baud 05h = 300 baud 06h = 600 baud 07h = 1200 baud 08h = 1800 baud 09h = 2000 baud 0Ah = 2400 baud 0Bh = 4800 baud 0Ch = 7200 baud 0Dh = 9600 baud 0Eh = 19200 baud --------------------------------------------- INT 16 - pcANYWHERE - GET/SET TERMINAL PARAMETERS AH = 7Dh AL = subfunction 00h set terminal parameters 01h get terminal parameters 02h get configuration header and terminal parameters DS:CX -> terminal parameter block --------------------------------------------- INT 16 - pcANYWHERE - COMMUNICATIONS I/O THROUGH PORT AH = 7Eh AL = subfunction 01h port input status Return AX = 0 if no characer ready, AX = 1 if character ready 02h port input character Return AL = received character 03h port output character in CX 11h hang up phone --------------------------------------------- INT 16 - pcANYWHERE - SET KEYBOARD/SCREEN MODE AH = 7Fh AL = subfunction 00h enable remote keyboard only 01h enable host keyboard only 02h enable both keyboards 08h display top 24 lines 09h display bottom 24 lines 10h Hayes modem 11h other modem 12h direct connect --------------------------------------------- INT 16 - MAKEY.COM - INSTALLATION CHECK AH = 80h Return: AX = 1954h if installed Note: MAKEY is a utility by System Enhancement Associates --------------------------------------------- INT 16 - Compaq 386 - SET CPU SPEED AH = F0h AL = speed 00h equivalent to 6 MHz 80286 (COMMON) 01h equivalent to 8 MHz 80286 (FAST) 02h full 16 MHz (HIGH) 03h toggles between 8 MHz-equivalent and speed set by system board switch (AUTO or HIGH) 08h full 16 MHz except 8 MHz-equivalent during floppy disk access 09h specify speed directly CX = speed value, 1 (slowest) to 50 (full), 3 ~= 8088 --------------------------------------------- INT 16 - Compaq 386 - READ CURRENT CPU SPEED AH = F1h Return: AL = speed code (see AH=F0h) if AL = 09h, CX = speed code --------------------------------------------- INT 16 - Compaq 386 - DETERMINE ATTACHED KEYBOARD TYPE AH = F2h Return: AL = type 00h if 11-bit AT keyboard is in use 01h if 9-bit PC keyboard is in use --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFB8h BH = subfunction 00h get Return: BL = old value of ??? nonzero set BL = new value for ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFB9h ??? Return: AX = ??? CX = ??? DS:SI -> ??? ES:DI -> ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFBAh ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFBBh ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - RESTORE ORIGINAL SCREEN??? AX = FFBCh --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - POP DOWN??? AX = FFBDh ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFBEh ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFBFh ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC0h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC1h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC2h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC3h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC4h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC5h Return: BL = ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - SET ??? AX = FFC6h BL = new value for ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC7h ??? Return: ??? Note: screen swapping??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - GET ??? AX = FFC8h Return: DS:SI -> ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFC9h SI = ??? CX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFCAh DX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFCBh DX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - DISPLAY ASCIZ STRING AX = FFCCh DS:SI -> ASCIZ string Return: AX = ??? CX = ??? ES:DI -> address past last character displayed --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFCDh DS:DX -> ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - SET ??? DELAYS AX = FFCEh CX = ??? Return: nothing??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFCFh ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD0h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD1h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD2h BX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD3h ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - CREATE/OPEN/DELETE FILE AX = FFD4h BH = 3Ch create file CX = file attributes 3Dh open file 41h delete file BL = access mode 00h read only 01h write only 02h read/write DS:SI -> ASCIZ filename Return: BX = file handle 0000h on error --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD5h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD6h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD7h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - SAFE CREATE FILE AX = FFD8h DS:BX -> ASCIZ filename Return: BX = file handle 0000h on error Note: pops up confirmation menu if file already exists only when popped up??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFD9h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFDAh DS:SI -> ??? Return: DS:SI -> ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFDBh ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - UNHOOK AX = FFDCh Return: interrupt vectors 09h, 16h, 1Ch, and 21h restored to original values --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - INSTALLATION CHECK AX = FFDDh BX = 0000h Return: CX = 5555h DX = 5555h if PCShell installed in resident mode --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - REQUEST POP-UP AX = FFDDh BX = 0001h --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - GET ??? AX = FFDDh BX = 0002h Return: AL = 00h ??? 01h ??? --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - REQUEST POP-UP AX = FFDDh BX = 0003h --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - ??? AX = FFDDh BX = 0004h ??? Return: DS:SI -> ??? --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - ??? AX = FFDDh BX = 0005h ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - ??? AX = FFDDh BX = 0006h ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - ??? AX = FFDDh BX = 0007h ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 PCShell API - ??? AX = FFDDh BX = 0008h ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFDEh DS:DX -> ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFDFh ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE0h CX = ??? DX = ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - BEEP AX = FFE1h --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE2h DX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE3h BL = ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE4h DX = segment of ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE5h DS:SI -> wildcard filename??? DX = ??? Return: AX = ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE6h DS:SI -> ??? Return: AX = ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE7h BX = segment of ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - DISPLAY NUMBER AX = FFE8h CX = number DH = attribute DS:SI -> destination for ASCII number Return: DS:SI buffer filled in with alternating characters and attributes --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFE9h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - DISPLAY COUNTED STRING AX = FFEAh DS:SI -> counted string (count byte followed by string) Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFEBh ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFECh DS:SI -> FAR routine to ??? BX = ??? Return: AX = ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFEDh Return: AX = ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFEEh SI = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - INSTALLATION CHECK AX = FFEFh CX = 0000h Return: CX = ABCDh if PC Tools DESKTOP.EXE installed BX = segment of resident portion AX = ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF0h DX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ALTERNATE INSTALLATION CHECK AX = FFF1h BX = 0000h leave ??? flag as is nonzero set ??? flag Return: CX = 5555h if installed DX = 5555h --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF2h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF3h ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF4h ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - GET SCREEN ATTRIBUTE ARRAY AX = FFF5h Return: ES:BX -> array of screen attributes 00h BYTE normal characters on desktop menu 01h BYTE highlighted characters on desktop menu 02h BYTE 03h BYTE etc. --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF6h DS = ??? BX = ??? DX = ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF7h SI = ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF8h DS:SI -> ??? BX = ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFF9h ES:BX -> FAR routine to ??? Return: ??? Note: available only when popped up --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFFAh Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFFBh Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - GET ??? AX = FFFCh Return: ES:BX = ??? DS:DX = original INT 9 vector --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - ??? AX = FFFDh ??? Return: ??? --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - SHOW MOUSE CURSOR AX = FFFEh --------------------------------------------- INT 16 - PC Tools v5.1 DESKTOP API - HIDE MOUSE CURSOR AX = FFFFh --------------------------------------------- INT 17 - PRINTER - OUTPUT CHARACTER AH = 00h AL = character DX = printer port (0-3) Return: AH = status bits 0 = time out 1 = unused 2 = unused 3 = I/O error 4 = selected 5 = out of paper 6 = acknowledge 7 = not busy --------------------------------------------- INT 17 - PRINTER - INITIALIZE AH = 01h DX = printer port (0-3) Return: AH = status (see AH=00h) --------------------------------------------- INT 17 - PRINTER - GET STATUS AH = 02h DX = printer port (0-3) Return: AH = status (see AH=00h) --------------------------------------------- INT 18 - TRANSFER TO ROM BASIC causes transfer to ROM-based BASIC (IBM-PC) often reboots a compatible; often has no effect at all --------------------------------------------- INT 19 - DISK BOOT causes reboot of disk system (no memory test performed) --------------------------------------------- INT 1A - CLOCK - GET TIME OF DAY AH = 00h Return: CX:DX = clock count AL = 00h if clock was read or written (via AH=0,1) within the current 24-hour period Otherwise, AL > 0 --------------------------------------------- INT 1A - CLOCK - SET TIME OF DAY AH = 01h CX:DX = clock count Return: time of day set --------------------------------------------- INT 1A - CLOCK - READ REAL TIME CLOCK (AT,XT286,CONV,PS) AH = 02h Return: CH = hours in BCD CL = minutes in BCD DH = seconds in BCD --------------------------------------------- INT 1A - CLOCK - SET REAL TIME CLOCK (AT,XT286,CONV,PS) AH = 03h CH = hours in BCD CL = minutes in BCD DH = seconds in BCD DL = 01h if daylight savings, 00h if standard time Return: CMOS clock set --------------------------------------------- INT 1A - CLOCK - READ DATE FROM REAL TIME CLOCK (AT,XT286,CONV,PS) AH = 04h Return: DL = day in BCD DH = month in BCD CL = year in BCD CH = century (19h or 20h) --------------------------------------------- INT 1A - CLOCK - SET DATE IN REAL TIME CLOCK (AT,XT286,CONV,PS) AH = 05h DL = day in BCD DH = month in BCD CL = year in BCD CH = century (19h or 20h) Return: CMOS clock set --------------------------------------------- INT 1A - CLOCK - SET ALARM (AT,XT286,CONV,PS) AH = 06h CH = hours in BCD CL = minutes in BCD DH = seconds in BCD Return: CF set if alarm already set or clock inoperable INT 4Ah will be called when alarm goes off, every 24 hours until reset --------------------------------------------- INT 1A - CLOCK - RESET ALARM (AT,XT286,CONV,PS) AH = 07h Return: alarm disabled --------------------------------------------- INT 1A - CLOCK - SET RTC ACTIVATED POWER ON MODE (CONVERTIBLE) AH = 08h CH = hours in BCD CL = minutes in BCD DH = seconds in BCD --------------------------------------------- INT 1A - CLOCK - READ RTC ALARM TIME AND STATUS (CONV,PS30) AH = 09h Return: CH = hours in BCD CL = minutes in BCD DH = seconds in BCD DL = alarm status 00h alarm not enabled 01h alarm enabled but will not power up system 02h alarm will power up system --------------------------------------------- INT 1A - CLOCK - READ SYSTEM-TIMER DAY COUNTER (XT2,PS) AH = 0Ah Return: CF set on error CX = count of days since Jan 1,1980 --------------------------------------------- INT 1A - CLOCK - SET SYSTEM-TIMER DAY COUNTER (XT2,PS) AH = 0Bh CX = count of days since Jan 1,1980 Return: CF set on error --------------------------------------------- INT 1A - PCjr - SET UP SOUND MULTIPLEXOR AH = 80h AL = 00h source is 8253 channel 2 01h source is cassette input 02h source is I/O channel "Audio IN" 03h source is sound generator chip --------------------------------------------- INT 1A - AT&T 6300 - READ TIME AND DATE AH = FEh Return: BX = day count (1 = Jan 1, 1984) CH = hour CL = minute DH = second DL = hundredths --------------------------------------------- INT 1B - CTRL-BREAK KEY This interrupt is called when the keyboard scanner of the IBM machines detects CTRL and BREAK pressed at the same time. It normally points to a short routine in DOS which sets the Ctrl-C flag, thus invoking INT 23h the next time DOS checks for Ctrl-C. --------------------------------------------- INT 1C - CLOCK TICK This interrupt is called (in the IBM) at the end of each time-update operation by the time-of-day routines. It normally points to an IRET. --------------------------------------------- INT 1D - (NOT a vector!) 6845 VIDEO INIT TABLES Format of video init tables: Offset Size Description 00h 16 BYTEs table for modes 0 and 1 \ 10h 16 BYTEs table for modes 2 and 3 \ each table contains values 20h 16 BYTEs table for modes 4, 5, and 6 / for first sixteen 6485 regs 30h 16 BYTEs table for mode 7 / 40h WORD size of video RAM for modes 0 and 1 42h WORD size of video RAM for modes 2 and 3 44h WORD size of video RAM for modes 4 and 5 46h WORD size of video RAM for modes 6 and 7 48h 8 BYTEs number of colums in each of modes 0 through 7 50h 8 BYTEs video controller mode byte for each mode --------------------------------------------- INT 1E - (NOT a vector!) DISKETTE PARAMS (BASE TABLE) default parameters at F000h:EFC7h in PC and most compatibles Format of diskette parameters: Offset Size Description 00h BYTE step rate & head unload times 01h BYTE head load time & DMA 02h BYTE motor off time in clock ticks (36 or 37 typical) 03h BYTE sector size in bytes (0->128, 1->256, 2->512, 3->1024) 04h BYTE last sector number (8 or 9 typical) 05h BYTE inter-sector gap size on read/write (42 typical) 06h BYTE data transfer length (255 typical) 07h BYTE inter-sector gap size on format (80 typical) 08h BYTE sector fill on format (F6h typical) 09h BYTE head-settle time ms (typical 25, 1.10->0, 2.10->15, 3.10->1) 0Ah BYTE motor start-up time (1/8 secs) (typical 4, 2.10->2) --------------------------------------------- INT 1F - (NOT a vector!) GRAPHICS SET 2 pointer to bitmaps for high 128 chars --------------------------------------------- INT 20 - Minix - SEND/RECEIVE MESSAGE AX = process ID of other process BX -> message CX = 1 send 2 receive 3 send&receive Note: the message contains the system call number (numbered as in V7 Unix(tm)) and the call parameters --------------------------------------------- INT 20 - DOS - PROGRAM TERMINATION returns to DOS--identical to INT 21/AH=00h --------------------------------------------- INT 21 - DOS - PROGRAM TERMINATION AH = 00h Return: never --------------------------------------------- INT 21 - DOS - KEYBOARD INPUT AH = 01h Return: AL = character read Note: ^C/^Break are checked, and INT 23h executed if read character is echoed to standard output --------------------------------------------- INT 21 - DOS - DISPLAY OUTPUT AH = 02h DL = character to send to standard output Note: ^C/^Break are checked, and INT 23h executed if pressed --------------------------------------------- INT 21 - DOS - AUX INPUT AH = 03h Return: AL = character read --------------------------------------------- INT 21 - DOS - AUX OUTPUT AH = 04h DL = character to send --------------------------------------------- INT 21 - DOS - PRINTER OUTPUT AH = 05h DL = character to print --------------------------------------------- INT 21 - DOS - DIRECT CONSOLE I/O CHARACTER OUTPUT AH = 06h DL = character <> FFh --------------------------------------------- INT 21 - DOS - DIRECT CONSOLE I/O CHARACTER INPUT AH = 06h DL = 0FFh Return: ZF set = no character ZF clear = character recieved AL = character Notes: Character is echoed to STDOUT if received. ^C/^Break are NOT checked --------------------------------------------- INT 21 - DOS - DIRECT STDIN INPUT, NO ECHO AH = 07h Note: same as function 06h for input but char not echoed --------------------------------------------- INT 21 - DOS - KEYBOARD INPUT, NO ECHO AH = 08h Return: AL = character Note: same as function 07h, but ^C/^Break are checked --------------------------------------------- INT 21 - DOS - PRINT STRING AH = 09h DS:DX -> string terminated by "$" Note: ^C/^Break checked, and INT 23h called if pressed --------------------------------------------- INT 21 - DOS - BUFFERED KEYBOARD INPUT AH = 0Ah DS:DX -> buffer Note: first byte of buffer must contain maximum length on entry, second byte contains actual length of previous line which may be recalled with the DOS line-editing commands on return the second byte contains actual length, third and subsequent bytes contain the input line --------------------------------------------- INT 21 - DOS - CHECK STANDARD INPUT STATUS AH = 0Bh Return: AL = FFh if character available 00h if no character Note: ^C/^Break checked, and INT 23h called if pressed --------------------------------------------- INT 21 - DOS - CLEAR KEYBOARD BUFFER AH = 0Ch AL must be 1, 6, 7, 8, or 0Ah. Notes: Flushes all typeahead input, then executes function specified by AL (effectively moving it to AH and repeating the INT 21 call). If AL contains a value not in the list above, the keyboard buffer is flushed and no other action is taken. --------------------------------------------- INT 21 - DOS - DISK RESET AH = 0Dh Note: Flushes all disk buffers. --------------------------------------------- INT 21 - DOS - SELECT DISK AH = 0Eh DL = new default drive number (0 = A, 1 = B, etc.) Return: AL = number of logical drives --------------------------------------------- INT 21 - DOS - OPEN DISK FILE AH = 0Fh DS:DX -> FCB (see below) Return: AL = 00h file found FFh file not found Note: (DOS 3+) file opened in compatibility mode Format of File Control Block: Offset Size Description -7 BYTE extended FCB if FFh -6 5 BYTEs reserved -1 BYTE file attribute if extended FCB 00h BYTE drive number (0 = default, 1 = A, etc) 01h 8 BYTEs blank-padded file name 09h 3 BYTEs blank-padded file extension 0Ch WORD current block number 0Eh WORD logical record size 10h DWORD file size 14h WORD date of last write (see AX=5700h) 16h WORD time of last write (see AX=5700h) 18h 8 BYTEs reserved (see below) 20h BYTE record within current block 21h DWORD random access record number (if record size is > 64 bytes, high byte is omitted) Format of reserved field for DOS 3.x: Offset Size Description 18h BYTE number of system file table entry for file 19h BYTE attributes bits 7,6: 00 = SHARE.EXE not loaded, disk file 01 = SHARE.EXE not loaded, character device 10 = SHARE.EXE loaded, remote file 11 = SHARE.EXE loaded, local file bits 5-0: low six bits of device attribute word ---SHARE.EXE loaded, local file--- 1Ah WORD starting cluster of file 1Ch WORD offset within SHARE of sharing record (see AH=52h) 1Eh BYTE file attribute 1Fh BYTE ??? ---SHARE.EXE loaded, remote file--- 1Ah WORD number of sector containing directory entry 1Ch WORD relative cluster within file of last cluster read 1Eh BYTE absolute cluster number of last cluster read 1Fh BYTE ??? ---SHARE.EXE not loaded--- 1Ah BYTE (low byte of device attribute word AND 0Ch) OR open mode 1Bh WORD starting cluster of file 1Dh WORD number of sector containing directory entry 1Fh BYTE number of directory entry within sector Note: if FCB opened on character device, DWORD at 1Ah is set to the address of the device driver header, then the BYTE at 1Ah is overwritten. --------------------------------------------- INT 21 - DOS - CLOSE DISK FILE AH = 10h DS:DX -> FCB (see AH=0Fh) Return: AL = 00h directory update successful FFh file not found in directory --------------------------------------------- INT 21 - DOS - SEARCH FIRST USING FCB AH = 11h DS:DX -> FCB (see AH=0Fh) Return: AL = status 00h file found [DTA] = unopened FCB for file that was found FFh file not found --------------------------------------------- INT 21 - DOS - SEARCH NEXT USING FCB AH = 12h DS:DX -> FCB (see AH=0Fh) Return: AL = status 00h file found [DTA] = unopened FCB for file that was found FFh file not found --------------------------------------------- INT 21 - DOS - DELETE FILE via FCB AH = 13h DS:DX -> FCB (see AH=0Fh) with filename field filled with template for deletion ('?' wildcard allowed, but not '*') Return: AL = status 00h file found FFh file not found --------------------------------------------- INT 21 - DOS - SEQUENTIAL DISK FILE READ AH = 14h DS:DX -> FCB (see AH=0Fh) Return: AL = status 00h successful read 01h end of file 02h data transfer area too small 03h partial record, EOF --------------------------------------------- INT 21 - DOS - SEQUENTIAL DISK RECORD WRITE AH = 15h DS:DX -> FCB (see AH=0Fh) Return: AL = status 00h successful write 01h disk full 02h data transfer area too small --------------------------------------------- INT 21 - DOS - CREATE A DISK FILE AH = 16h DS:DX -> FCB (see AH=0Fh) Return: AL = status 00h successful creation FFh directory full Note: if file already exists, it is truncated to zero length --------------------------------------------- INT 21 - DOS - RENAME FILE via FCB AH = 17h DS:DX -> FCB (see AH=0Fh) FCB contains new name starting at byte 17h. Return: AL = status 00h file found FFh file not found --------------------------------------------- INT 21 - DOS internal - UNUSED AH = 18h Return: AL = 00h --------------------------------------------- INT 21 - DOS - GET DEFAULT DISK NUMBER AH = 19h Return: AL = current drive number (letter - 'A') --------------------------------------------- INT 21 - DOS - SET DISK TRANSFER AREA ADDRESS AH = 1Ah DS:DX -> disk transfer buffer --------------------------------------------- INT 21 - DOS - ALLOCATION TABLE INFORMATION AH = 1Bh Return: DS:BX -> FAT ID byte for default drive DX = number of allocation units on disk AL = number of sectors per allocation unit (cluster) CX = number of bytes per sector --------------------------------------------- INT 21 - DOS - ALLOCATION TABLE INFORMATION FOR SPECIFIC DEVICE AH = 1Ch DL = drive number to check Return: DS:BX -> FAT ID byte DX = number of allocation units on disk AL = number of sectors per allocation unit (cluster) CX = number of bytes per sector --------------------------------------------- INT 21 - DOS internal - UNUSED AH = 1Dh Return: AL = 00h --------------------------------------------- INT 21 - DOS internal - UNUSED AH = 1Eh Return: AL = 00h --------------------------------------------- INT 21 - DOS internal - GET DEFAULT DRIVE PARAMETER BLOCK AH = 1Fh Return: AL = 00h No Error FFh Error DS:BX -> drive parameter block Note: for DOS 2+, this just invokes function 32h with DL = 0 --------------------------------------------- INT 21 - DOS internal - UNUSED AH = 20h Return: AL = 00h --------------------------------------------- INT 21 - DOS - RANDOM DISK RECORD READ AH = 21h DS:DX -> FCB (see AH=0Fh) Return: AL = status 00h successful read 01h end of file 02h data transfer area too small 03h partial record, EOF --------------------------------------------- INT 21 - DOS - RANDOM DISK RECORD WRITE AH = 22h DS:DX -> FCB (see AH=0Fh) Return: AL = status (see AH=21h) --------------------------------------------- INT 21 - DOS - GET FILE SIZE AH = 23h DS:DX -> unopened FCB (see AH=0Fh) with filename and record size fields initialized Return: AL = status 00h file found FFh file not found Note: FCB's random-record field set to number of records (rounded up) --------------------------------------------- INT 21 - DOS - SET RANDOM RECORD FIELD AH = 24h DS:DX -> open FCB (see AH=0Fh) Return: Random Record Field of FCB is set to be same as Current Block and Current Record. --------------------------------------------- INT 21 - DOS - SET INTERRUPT VECTOR AH = 25h AL = interrupt number DS:DX = new vector to be used for specified interrupt --------------------------------------------- INT 21 - DOS - CREATE PSP AH = 26h DX = segment number at which to set up PSP Return: current PSP is copied to specified segment Note: new PSP is updated with memory size information; INTs 22h, 23h, 24h taken from interrupt vector table Format of PSP: Offset Size Description 00h 2 BYTEs program exit point 02h WORD memory size in paragraphs 04h BYTE unused 05h 5 BYTEs CP/M entry point 0Ah DWORD terminate address (old INT 22h) 0Eh DWORD break address (old INT 23h) 12h DWORD critical error handler (old INT 24h) 16h WORD parent PSP segment 18h 20 BYTEs DOS 2+ open file table, FFh = unused 2Ch WORD DOS 2+ environment segment 2Eh DWORD DOS 2+ process's SS:SP on entry to last INT 21 call 32h WORD DOS 3+ max open files 34h DWORD DOS 3+ open file table address 38h DWORD DOS 3+ ??? (set to FFFFFFFFh in DOS 3.1 and 3.3) 3Ch 20 BYTEs unused by DOS versions <= 3.3 50h 3 BYTEs DOS function dispatcher (FAR routine)--CDh 21h CBh 53h 9 BYTEs unused 5Ch 16 BYTEs FCB #1 (see AH=0Fh), filled in from first commandline argument (when opened, overwrites following FCB) 6Ch 20 BYTEs FCB #2 (see AH=0Fh), filled in from second commandline argument (when opened, overwrites part of command tail) 80h 128 BYTEs command tail / default DTA buffer command tail is BYTE for length of tail, N BYTEs for the tail, followed by a BYTE containing 0Dh --------------------------------------------- INT 21 - DOS - RANDOM BLOCK READ AH = 27h DS:DX -> FCB (see AH=0Fh) CX = number of records to be read Return: AL = status 00h successful read 01h end of file 02h data transfer area too small 03h partial record, EOF --------------------------------------------- INT 21 - DOS - RANDOM BLOCK WRITE AH = 28h DS:DX -> FCB (see AH=0Fh) CX = number of records to be written if zero, truncate file to current random file position Return: AL = status 00h successful write 01h disk full 02h data transfer area too small --------------------------------------------- INT 21 - DOS - PARSE FILENAME AH = 29h DS:SI -> string to parse ES:DI -> buffer to fill with unopened FCB (see AH=0Fh) AL = bit mask to control parsing 0 = 0: parsing stops if file separator found 1: leading separators ignored 1 = 0: drive number in FCB set to default drive if not present in string 1: drive number in FCB not changed 2 = 0: filename in FCB set to blanks if no filename in string 1: filename in FCB not changed if string does not contain a filename 3 = 0: extension in FCB set to blanks if no extension in string 1: extension left unchanged Return: AL = 00h no wildcards in name or extension 01h wildcards appeared FFh drive specifier invalid DS:SI -> first byte after parsed string ES:DI buffer filled with unopened FCB --------------------------------------------- INT 21 - DOS - GET CURRENT DATE AH = 2Ah Return: DL = day DH = month CX = year AL = day of the week (0=Sunday, 1=Monday, etc.) --------------------------------------------- INT 21 - DOS - SET CURRENT DATE AH = 2Bh DL = day DH = month CX = year Return: AL = 00h if no error = FFh if bad value sent to routine Note: DOS 3.3+ also sets CMOS clock --------------------------------------------- INT 21 - DESQview - INSTALLATION CHECK AH = 2Bh AL = subfunction (DV v2.00+) 01h get version Return: BX = version (BH = major, BL = minor) Note: early copies of v2.00 return 0002h 02h get shadow buffer info, and start shadowing Return: BH = rows in shadow buffer BL = columns in shadow buffer DX = segment of shadow buffer 04h get shadow buffer info Return: BH = rows in shadow buffer BL = columns in shadow buffer DX = segment of shadow buffer 05h stop shadowing CX = 4445h ('DE') DX = 5351h ('SQ') Return: AL = FFh if DESQview not installed Note: in DESQview v1.x, there were no subfunctions; this call only identified whether or not DESQview was loaded --------------------------------------------- INT 21 - PC Tools v5.1 PC-CACHE - INSTALLATION CHECK AH = 2Bh CX = 4358h ('CX') Return: AL = FFh if PC-CACHE not installed AL = 00h if installed CX = 6378h BX = ??? DX = ??? --------------------------------------------- INT 21 - DOS - GET CURRENT TIME AH = 2Ch Return: CH = hours CL = minutes DH = seconds DL = hundredths of seconds Note: time is updated approximately every 5/100 second --------------------------------------------- INT 21 - DOS - SET CURRENT TIME AH = 2Dh CH = hours CL = minutes DH = seconds DL = hundredths of seconds Return: AL = 00h if no error = FFh if bad value sent to routine Note: DOS 3.3+ also sets CMOS clock --------------------------------------------- INT 21 - DOS - SET VERIFY FLAG AH = 2Eh DL = 00h AL = 01h VERIFY on 00h VERIFY off --------------------------------------------- INT 21 - DOS 2+ - GET DISK TRANSFER AREA ADDRESS AH = 2Fh Return: ES:BX -> DTA --------------------------------------------- INT 21 - DOS 2+ - GET DOS VERSION AH = 30h Return: AL = Major Version number (0 for DOS 1.x) AH = Minor Version number BH = OEM number 00h IBM 16h DEC BL:CX = 24-bit user number --------------------------------------------- INT 21 - DOS 2+ - TERMINATE BUT STAY RESIDENT AH = 31h AL = exit code DX = program size, in paragraphs --------------------------------------------- INT 21 - DOS 2+ internal - GET DRIVE PARAMETER BLOCK AH = 32h DL = drive number 0 = default, 1 = A, etc. Return: AL = 0FFh if invalid drive number, else DS:BX -> drive parameter block Format of DOS Drive Parameter Block: Offset Size Description 00h BYTE drive number (0 = A, etc.) 01h BYTE unit number within device driver 02h WORD number of bytes per sector 04h BYTE largest sector number in cluster (one less than sect/clust) 05h BYTE log base two of the cluster size 06h WORD number of reserved (boot) sectors 08h BYTE number of copies of the FAT 09h WORD number of root directory entries 0Bh WORD first data sector on medium 0Dh WORD largest possible cluster number (one more than # data clust) ---DOS 2.x--- 0Fh BYTE number of sectors in one FAT copy 10h WORD first sector of root directory 12h DWORD address of device driver for this drive 16h BYTE media descriptor byte for medium 17h BYTE FFh indicates block must be rebuilt 18h DWORD address of next device block, offset = FFFFh indicates last 1Ch WORD starting cluster of current directory (0 = root directory) 1Eh 64 BYTEs ASCIZ current directory path string ---DOS 3.x--- 0Fh BYTE number of sectors in one FAT copy 10h WORD first sector of root directory 12h DWORD address of device driver for this drive 16h BYTE media descriptor byte for medium 17h BYTE FFh = block must be rebuilt, 00h indicates block accessed 18h DWORD address of next device block, offset = FFFFh indicates last 1Ch WORD cluster at which to start search for free space when writing 1Eh WORD number of free clusters on drive, FFFFh = unknown ---DOS 4.0--- 0Fh WORD number of sectors in one FAT copy 11h WORD first sector of root directory 13h DWORD address of device driver for this drive 17h BYTE media descriptor byte for medium 18h BYTE FFh = block must be rebuilt, 00h indicates block accessed 19h DWORD address of next device block, offset = FFFFh indicates last 1Dh WORD cluster at which to start search for free space when writing 1Fh WORD number of free clusters on drive, FFFFh = unknown??? --------------------------------------------- INT 21 - DOS 2+ - EXTENDED CONTROL-BREAK CHECKING AH = 33h AL = subfunction 00h get state 01h set state DL = 00h for OFF or 01h for ON 02h (DOS 3.x internal) get and set state DL = 00h for OFF or 01h for ON Return: DL = old BREAK setting Return: DL = current BREAK setting if AL = 00h 00h BREAK=OFF 01h BREAK=ON AL = FFh if error Note: under DOS 3+, this function does not use any of the DOS-internal stacks and is thus fully reentrant --------------------------------------------- INT 21 - DOS 4.0 - GET BOOT DRIVE AX = 3305h Return: DL = boot drive (1=A:,...) --------------------------------------------- INT 21 - DOS 2+ internal - RETURN CritSectFlag POINTER AH = 34h Return: ES:BX -> 1-byte DOS "Critical Section Flag", also known as InDOS flag Notes: when the critical section flag is nonzero, code within DOS is being executed. It is safe to enter DOS when both the critical section flag and the critical error flag are zero. The critical error flag is the byte after the critical section flag in DOS 2.x, and the byte BEFORE the critical section flag in DOS 3.x (except COMPAQ DOS 3.0, where the critical error flag is located 1AAh bytes BEFORE the critical section flag) --------------------------------------------- INT 21 - DOS 2+ - GET INTERRUPT VECTOR AH = 35h AL = interrupt number Return: ES:BX = value of interrupt vector --------------------------------------------- INT 21 - DOS 2+ - GET DISK SPACE AH = 36h DL = drive code (0 = default, 1 = A, 2 = B, etc.) Return: AX = number of sectors per cluster or 0FFFFh if invalid drive BX = number of available clusters CX = bytes per sector DX = total clusters Note: multiply AX * CX * BX for free space on disk multiply AX * CX * DX for total disk space --------------------------------------------- INT 21 - DOS 2+ internal - GET SWITCHAR AX = 3700h Return: AL = FFh unsupported subfunction DL = current switch character --------------------------------------------- INT 21 - DOS 2+ internal - SET SWITCHAR AX = 3701h DL = new switch character Return: AL = FFh unsupported subfunction --------------------------------------------- INT 21 - DOS 2.x only internal - AVAILDEV AH = 37h AL = subfunction 02h read device availability (as set by AL=03h) Return: DL = device availability 03h set device availability, where: DL = 00h means \DEV\ must preceed device names DL <> 00h means \DEV\ need not preceed device names Return: AL = FFh if invalid subfunction --------------------------------------------- INT 21 - DOS 2+ - GET COUNTRY-DEPENDENT INFORMATION AH = 38h --DOS 2.x-- AL = 00h get current-country info DS:DX -> buffer for returned info (see below) Return: BX = country code buffer at DS:DX filled --DOS 3+-- AL = 00h for current country AL = 01h thru 0FEh for specific country with code <255 AL = 0FFh for specific country with code >= 255 BX = 16-bit country code DS:DX -> buffer for returned info (see below) Return: CF set on error AX = error code (02h) CF clear if successful BX = country code DS:DX buffer filled Format of DOS 2.x country info: Offset Size Description 00h WORD date format 0 = USA mm dd yy 1 = Europe dd mm yy 2 = Japan yy mm dd 02h BYTE currency symbol 03h BYTE 00h 04h BYTE thousands separator char 05h BYTE 00h 06h BYTE decimal separator char 07h BYTE 00h 08h 24 BYTEs reserved Format of DOS 3+ country info: Offset Size Description 00h WORD date format (see above) 02h 5 BYTEs ASCIZ currency symbol string 07h BYTE thousands separator char 08h BYTE 00h 09h BYTE decimal separator char 0Ah BYTE 00h 0Bh BYTE date separator char 0Ch BYTE 00h 0Dh BYTE time separator char 0Eh BYTE 00h 0Fh BYTE currency format bit 2 = set if currency symbol replaces decimal pt bit 1 = number of spaces between value and curr sym bit 0 = 0 if currency symbol precedes value 1 if currency symbol follows value 10h BYTE number of digits after decimal in currency 11h BYTE time format bit 0 = 0 if 12-hour clock 1 if 24-hour clock 12h DWORD address of case map routine (FAR CALL, AL = char to map) 16h BYTE data-list separator char 17h BYTE 00h 18h 10 BYTEs reserved --------------------------------------------- INT 21 - DOS 3+ - SET COUNTRY CODE AH = 38h AL = 01h thru 0FEh for specific country with code <255 AL = FFh for specific country with code >= 255 BX = 16-bit country code DX = FFFFh Return: CF set on error AX = error code (see AH=59h) CF clear if successful --------------------------------------------- INT 21 - DOS 2+ - CREATE A SUBDIRECTORY (MKDIR) AH = 39h DS:DX -> ASCIZ pathname Return: CF set on error AX = error code (03h,05h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - REMOVE A DIRECTORY ENTRY (RMDIR) AH = 3Ah DS:DX -> ASCIZ pathname Return: CF set on error AX = error code (03h,05h,06h,10h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - CHANGE THE CURRENT DIRECTORY (CHDIR) AH = 3Bh DS:DX -> ASCIZ directory name Return: CF set on error AX = error code (03h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - CREATE A FILE WITH HANDLE (CREAT) AH = 3Ch CX = attributes for file bit 0: read-only 1: hidden 2: system 3: volume label 4: reserved, must be zero (directory) 5: archive bit 7: if set, file is shareable under Novell NetWare DS:DX -> ASCIZ filename Return: CF set on error AX = error code (03h,04h,05h) (see AH=59h) CF clear if successful AX = file handle --------------------------------------------- INT 21 - DOS 2+ - OPEN DISK FILE WITH HANDLE AH = 3Dh AL = access mode 00h read only 01h write only 02h read/write AL bits 7-3 = file-sharing modes (DOS 3+) bit 7 = inheritance flag, set for no inheritance bits 4-6 = sharing mode 000 compatibility mode 001 exclusive (deny all) 010 write access denied (deny write) 011 read access denied (deny read) 100 full access permitted (deny none) bit 3 = reserved, should be zero DS:DX -> ASCIZ filename Return: CF set on error AX = error code (01h,02h,03h,04h,05h,0Ch) (see AH=59h) CF clear if successful AX = file handle --------------------------------------------- INT 21 - DOS 2+ - CLOSE A FILE WITH HANDLE AH = 3Eh BX = file handle Return: CF set on error AX = error code (06h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - READ FROM FILE WITH HANDLE AH = 3Fh BX = file handle CX = number of bytes to read DS:DX -> buffer Return: CF set on error AX = error code (05h,06h) (see AH=59h) CF clear if successful AX = number of bytes read (0 if at EOF before call) --------------------------------------------- INT 21 - DOS 2+ - WRITE TO FILE WITH HANDLE AH = 40h BX = file handle CX = number of bytes to write DS:DX -> buffer Return: CF set on error AX = error code (05h,06h) (see AH=59h) CF clear if successful AX = number of bytes actually written Note: if CX is zero, no data is written, and the file is truncated or extended to the current position --------------------------------------------- INT 21 - DOS 2+ - DELETE A FILE (UNLINK) AH = 41h DS:DX -> ASCIZ name of file to delete Return: CF set on error AX = error code (02h,05h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - MOVE FILE READ/WRITE POINTER (LSEEK) AH = 42h AL = method 00h offset from beginning of file 01h offset from present location 02h offset from end of file BX = file handle CX:DX = offset in bytes Return: CF set on error AX = error code (01h,06h) (see AH=59h) CF clear if successful DX:AX = new offset --------------------------------------------- INT 21 - DOS 2+ - GET FILE ATTRIBUTES AX = 4300h DS:DX -> ASCIZ file name Return: CF set on error AX = error code (01h,02h,03h,05h) (see AH=59h) CF clear if successful CX = file attributes (see AX=4301h) --------------------------------------------- INT 21 - DOS 2+ - PUT FILE ATTRIBUTES (CHMOD) AX = 4301h CX = file attribute bits bit 0 = read only 1 = hidden file 2 = system file 3 = volume label 4 = subdirectory 5 = written since backup ("archive" bit) 8 = shareable (Novell NetWare) DS:DX -> ASCIZ file name Return: CF set on error AX = error code (01h,02h,03h,05h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - IOCTL - GET DEVICE INFORMATION AX = 4400h BX = file or device handle Return: CF set on error AX = error code (see AH=59h) CF clear if successful DX = device info If bit 7 set: (character device) bit 0: console input device 1: console output device 2: NUL device 3: CLOCK$ device 4: device is special 5: binary (raw) mode 6: Not EOF 12: network device (DOS 3+) 14: can process IOCTL control strings (see AL = 02h-05h) If bit 7 clear: (file) bits 0-5 are block device number 6: file has not been written 12: network device (DOS 3+) 14: ??? (DOS 3+) 15: file is remote (DOS 3+) --------------------------------------------- INT 21 - DOS 2+ - IOCTL - SET DEVICE INFORMATION AX = 4401h BX = device handle DH = 0 DL = device information to set (bits 0-7 from function 0) Return: CF set on error AX = error code (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - IOCTL - READ CHARACTER DEVICE CONTROL STRING AX = 4402h BX = device handle CX = number of bytes to read DS:DX -> buffer Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX = number of bytes read --------------------------------------------- INT 21 - DOS 2+ - IOCTL - WRITE CHARACTER DEVICE CONTROL STRING AX = 4403h BX = device handle CX = number of bytes to write DS:DX -> buffer Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX = number of bytes written --------------------------------------------- INT 21 - DOS 2+ - IOCTL - READ BLOCK DEVICE CONTROL STRING AX = 4404h BL = drive number (0=default) CX = number of bytes to read DS:DX -> buffer Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX = number of bytes read --------------------------------------------- INT 21 - DOS 2+ - IOCTL - WRITE BLOCK DEVICE CONTROL STRING AX = 4405h BL = drive number (0=default) CX = number of bytes to write DS:DX -> buffer Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX = number of bytes written --------------------------------------------- INT 21 - DOS 2+ - IOCTL - GET INPUT STATUS AX = 4406h BX = file or device handle Return: AL = FFh device ready 00h device not ready --------------------------------------------- INT 21 - DOS 2+ - IOCTL - GET OUTPUT STATUS AX = 4407h BX = file or device handle Return: AL = FFh device ready 00h device not ready Note: for DOS 2.x, files are always ready for output --------------------------------------------- INT 21 - DOS 3+ - IOCTL - BLOCK DEVICE CHANGEABLE AX = 4408h BL = drive number (0=default) Return: AX = 00h removable 01h fixed 0Fh invalid drive --------------------------------------------- INT 21 - DOS 3+ - IOCTL - BLOCK DEVICE LOCAL AX = 4409h BL = drive number (0=default) Return: DX = attribute word, bit 12 set if device is remote --------------------------------------------- INT 21 - DOS 3+ - IOCTL - HANDLE LOCAL AX = 440Ah BX = file handle Return: DX = attribute word, bit 15 set if file is remote Note: if file is remote, Novell Advanced NetWare 2.0 returns the number of the file server on which the handle is located in CX --------------------------------------------- INT 21 - DOS 3+ - IOCTL - SET SHARING RETRY COUNT AX = 440Bh CX = delay (default 1) DX = retry count (default 3) Return: CF set on error AX = error code (see AH=59h) --------------------------------------------- INT 21 - DOS 3.2+ - IOCTL - GENERIC AX = 440Ch BX = device handle CH = category code 00h unknown (DOS 3.3+) 01h COMn: (DOS 3.3+) 03h CON (DOS 3.3+) 05h LPTn: CL = function 45h set iteration count 4Ah select code page 4Ch start code-page preparation 4Dh end code-page preparation 5Fh set display information (DOS 4.0) 65h get iteration count 6Ah query selected code page 6Bh query prepare list 7Fh get display information (DOS 4.0) DS:DX -> parameter block (see below) Return: CF set on error AX = error code (see AH=59h) Format of parameter block for function 45h: Offset Size Description 00h WORD number of times output is attempted before driver assumes device is busy Format of parameter block for functions 4Ah and 6Ah: Offset Size Description 00h WORD length of data 02h WORD code page ID 04h 2N BYTEs DCBS (double byte character set) lead byte range start/end for each of N ranges (DOS 4.0) WORD 0000h end of data (DOS 4.0) Format of parameter block for function 4Dh: Offset Size Description 00h WORD length of data 02h WORD code page ID Format of parameter block for function 4Ch: Offset Size Description 00h WORD flags 02h WORD length of remainder of parameter block 04h WORD number of code pages following 06h N WORDs code page 1,...,N Format of parameter block for functions 5Fh and 7Fh: Offset Size Description 00h BYTE level (0 for DOS 4.0) 01h BYTE reserved (0) 02h WORD length of following data (14) 04h WORD control flags bit 0 set for blink, clear for intensity bits 1 to 15 reserved 06h BYTE mode type (1=text, 2=graphics) 07h BYTE reserved (0) 08h WORD colors 0 = monochrome else N bits per pixel 0Ah WORD pixel columns 0Ch WORD pixel rows 0Eh WORD character columns 10h WORD character rows Format of parameter block for function 6Bh: Offset Size Description 00h WORD length of following data 02h WORD number of hardware code pages 04h N WORDs hardware code pages 1,...,N WORD number of prepared code pages N WORDs prepared code pages 1,...,N --------------------------------------------- INT 21 - DOS 3.2+ - IOCTL - BLOCK DEVICE REQUEST AX = 440Dh BL = drive number (0=default) CH = category code 08h disk drive CL = function 40h set device parameters 41h write logical device track 42h format and verify logical device track 47h set access flag (DOS 4.0) 60h get device parameters 61h read logical device track 62h verify logical device track 67h get access flag (DOS 4.0) DS:DX -> parameter block (see below) Return: CF set on error AX = error code (see AH=59h) Note: DOS 4.01 seems to ignore the high byte of the number of directory entries in the BPB for diskettes. Format of parameter block for functions 40h, 60h: Offset Size Description 00h BYTE special functions bit 0 set if function to use current BPB, clear if Device BIOS Parameter Block field contains new default BPB bit 1 set if function to use track layout fields only must be clear if CL=60h bit 2 set if all sectors in track same size (should be set) bits 3-7 reserved 01h BYTE device type 00h 320K/360K disk 01h 1.2M disk 02h 720K disk 03h single-density 8-inch disk 04h double-density 8-inch disk 05h fixed disk 06h tape drive 07h 1.44M disk 08h other type of block device 02h WORD device attributes bit 0 set if nonremovable medium bit 1 set if door lock supported bits 2-15 reserved 04h WORD number of cylinders 06h BYTE media type 00h 1.2M disk (default) 01h 320K/360K disk 07h 31 BYTEs device BPB (see AH=53h) 26h WORD number of sectors per track (start of track layout field) 28h N word pairs: number,size of each sector in track Format of parameter block for functions 41h, 61h: Offset Size Description 00h BYTE reserved, must be zero 01h WORD number of disk head 03h WORD number of disk cylinder 05h WORD number of first sector to read/write 07h WORD number of sectors 09h DWORD transfer address Format of parameter block for functions 42h, 62h: Offset Size Description 00h BYTE reserved, must be zero (DOS <3.2) bit 0=0: format/verify track 1: format status call (DOS 3.2+) bits 1-7 reserved, must be zero on return (DOS 4.0): bit 0: set if specified tracks, sectors/track supported bit 1: set if function not supported by BIOS bit 2: set if specified tracks, sectors/track not supported bit 3: set if no disk in drive 01h WORD number of disk head 03h WORD number of disk cylinder Format of parameter block for functions 47h, 67h: Offset Size Description 00h BYTE special-function field (must be zero) 01h BYTE disk-access flag, nonzero if access allowed by driver --------------------------------------------- INT 21 - DOS 3.2+ - IOCTL - GET LOGICAL DRIVE MAP AX = 440Eh BL = drive number (0=default) Return: CF set on error AX = error code (see AH=59h) CF clear if successful AL = 00h block device has only one logical drive assigned 1..26 the last letter used to reference the drive (1=A:,etc) --------------------------------------------- INT 21 - DOS 3.2+ - IOCTL - SET LOGICAL DRIVE MAP AX = 440Fh BL = physical drive number (0=default) Return: CF set on error AX = error code (see AH=59h) Note: maps logical drives to physical drives, similar to DOS's treatment of a single physical floppy drive as both A: and B: --------------------------------------------- INT 21 - DOS 2+ - CREATE DUPLICATE HANDLE (DUP) AH = 45h BX = file handle to duplicate Return: CF set on error AX = error code (04h,06h) (see AH=59h) CF clear if successful AX = new file handle --------------------------------------------- INT 21 - DOS 2+ - FORCE DUPLICATE HANDLE (FORCDUP,DUP2) AH = 46h BX = existing file handle CX = new file handle Return: CF set on error AX = error code (04h,06h) (see AH=59h) Note: closes file with handle BX if it is still open --------------------------------------------- INT 21 - DOS 2+ - GET CURRENT DIRECTORY AH = 47h DL = drive (0=default, 1=A, etc.) DS:SI points to 64-byte buffer area Return: CF set on error AX = error code (0Fh) (see AH=59h) Note: the returned path does not include the initial backslash --------------------------------------------- INT 21 - DOS 2+ - ALLOCATE MEMORY AH = 48h BX = number of 16-byte paragraphs desired Return: CF set on error AX = error code (07h,08h) (see AH=59h) BX = size of largest available block CF clear if successful AX = segment of allocated memory block --------------------------------------------- INT 21 - DOS 2+ - FREE MEMORY AH = 49h ES = segment address of area to be freed Return: CF set on error AX = error code (07h,09h) (see AH=59h) --------------------------------------------- INT 21 - DOS 2+ - ADJUST MEMORY BLOCK SIZE (SETBLOCK) AH = 4Ah ES = segment address of block to change BX = new size in paragraphs Return: CF set on error AX = error code (07h,08h,09h) (see AH=59h) BX = maximum size possible for the block --------------------------------------------- INT 21 - DOS 2+ - LOAD OR EXECUTE (EXEC) AH = 4Bh AL = subfunction 00h load and execute program 01h load but do not execute (internal) 03h load overlay; do not create PSP DS:DX -> ASCIZ filename ES:BX -> parameter block (see below) Return: CF set on error AX = error code (01h,02h,05h,08h,0Ah,0Bh) (see AH=59h) CF clear if successful if function 1 and DOS 3+ or DESQview, process ID set to new program's PSP; get with INT 21/AH=62h if function 1 and DOS 2.x, new program's initial stack and entry point returned in registers Note: DOS 2.x destroys all registers, including SS:SP Format of EXEC parameter block for AL=00h: Offset Size Description 00h WORD segment of environment (0 = use current) 02h DWORD pointer to command line 06h DWORD pointer to first FCB (see AH=0Fh) 0Ah DWORD pointer to second FCB (see AH=0Fh) Format of EXEC parameter block for AL=01h: Offset Size Description 00h WORD segment of environment (0 = use current) 02h DWORD pointer to command line 06h DWORD pointer to first FCB (see AH=0Fh) 0Ah DWORD pointer to second FCB (see AH=0Fh) 0Eh DWORD (DOS 3+) will hold subprogram's initial SS:SP on return 12h DWORD (DOS 3+) will hold entry point (CS:IP) on return Format of EXEC parameter block for AL=03h: Offset Size Description 00h WORD segment load address 02h WORD segment relocation factor Format of .EXE file header: Offset Size Description 00h WORD 4Dh, 5Ah signature (sometimes 5Ah, 4Dh) 02h WORD image size remainder (program size mod 512) 04h WORD file size in pages (program size div 512) 06h WORD number of relocation items 08h WORD header size in paragraphs 0Ah WORD minimum extra paragraphs needed 0Ch WORD maximum extra paragraphs needed 0Eh WORD stack segment 10h WORD stack offset 12h WORD word checksum of entire file 14h DWORD initial CS:IP 18h WORD offset of relocation table 1Ah WORD overlay number --------------------------------------------- INT 21 - DOS 2+ - QUIT WITH EXIT CODE (EXIT) AH = 4Ch AL = exit code Return: never returns --------------------------------------------- INT 21 - DOS 2+ - GET EXIT CODE OF SUBPROGRAM (WAIT) AH = 4Dh Return: AL = exit code of subprogram (from AH=31h or AH=4Ch) AH = circumstance which caused termination 00h Terminate/abort 01h Control-C/Control-Break 02h Hard error 03h Terminate and stay resident --------------------------------------------- INT 21 - DOS 2+ - FIND FIRST ASCIZ (FIND FIRST) AH = 4Eh CX = search attributes DS:DX -> ASCIZ filename Return: CF set on error AX = error code (02h,12h) (see AH=59h) CF clear if successful [DTA] = data block (see below) Format of FindFirst data block: Offset Size Description ---PCDOS 3.10, MSDOS 3.2/3.3--- 00h BYTE drive letter 01h 11 BYTEs search template 0Ch BYTE search attributes ---DOS 2.x (and some DOS 3.x???)--- 00h BYTE search attributes 01h BYTE drive letter 02h 11 BYTEs search template ---DOS 2.x and most 3.x--- 0Dh WORD entry count within directory 0Fh 4 BYTEs reserved 13h WORD cluster number of start of parent directory ---MSDOS 3.2/3.3--- 0Dh WORD entry count within directory 0Fh WORD cluster number of start of parent directory 11h 4 BYTEs reserved ---all versions, documented fields--- 15h BYTE attribute of file found 16h WORD file time bits 11-15: hour bits 5-10: minute bits 0-4: seconds/2 18h WORD file date bits 9-15: year-1980 bits 5-8: month bits 0-4: day 1Ah DWORD file size 1Eh 13 BYTEs ASCIZ filename+extension --------------------------------------------- INT 21 - DOS 2+ - FIND NEXT ASCIZ (FIND NEXT) AH = 4Fh [DTA] = data block from last AH = 4Eh/4Fh call Return: CF set on error AX = error code (12h) (see AH=59h) CF clear if successful [DTA] = data block (see AH=4Eh) --------------------------------------------- INT 21 - DOS 2+ internal - SET PSP SEGMENT AH = 50h BX = segment address of new PSP (see AH=26h) Notes: under DOS 2.x, this function cannot be invoked inside an INT 28h handler without setting the Critical Error flag under DOS 3+, this function does not use any of the DOS-internal stacks and is thus fully reentrant --------------------------------------------- INT 21 - DOS 2+ internal - GET PSP SEGMENT AH = 51h Return: BX = current PSP segment (see AH=26h) Notes: under DOS 2.x, this function cannot be invoked inside an INT 28h handler without setting the Critical Error flag under DOS 3+, this function does not use any of the DOS-internal stacks and is thus fully reentrant --------------------------------------------- INT 21 - DOS 2+ internal - GET LIST OF LISTS AH = 52h Return: ES:BX points to DOS list of lists Note: not supported in OS/2 compatibility box Format of List of Lists: Offset Size Description -12 WORD (DOS 3.1-3.3) sharing retry count (see AX=440Bh) -10 WORD (DOS 3.1-3.3) sharing retry delay (see AX=440Bh) -8 DWORD (DOS 3.x) pointer to current disk buffer -4 WORD (DOS 3.x) ??? (default 0000h) -2 WORD segment of first memory control block 00h DWORD pointer to first DOS Device Control Block (see AH=32h) 04h DWORD pointer to list of DOS file tables (see below) 08h DWORD pointer to CLOCK$ device driver, resident or installable 0Ch DWORD pointer to actual CON device driver, resident or installable ---DOS 2.x--- 10h BYTE number of logical drives in system 11h WORD maximum bytes/block of any block device 13h DWORD pointer to first disk buffer (see below) 17h Beginning (not a pointer--the real beginning!) of NUL device driver. This is the first device on DOS's linked list of device drivers. (see below for format) ---DOS 3.x--- 10h WORD maximum bytes/block of any block device 12h DWORD pointer to first disk buffer (see below) 16h DWORD pointer to array of drive info (see below) 1Ah DWORD pointer to FCB table (if CONFIG.SYS contains FCBS=) 1Eh WORD size of FCB table 20h BYTE number of block devices 21h BYTE value of LASTDRIVE command in CONFIG.SYS (default 5) 22h 18 BYTEs actual NUL device driver header (not a pointer!) This is the first device on DOS's linked list of device drivers. (see below for format) 34h BYTE number of JOIN'ed drives ---DOS 3.1-3.3--- 35h BYTE ??? 90h (probably padding from "EVEN" assembler directive) 36h DWORD SHARE.EXE hook: pointer to FAR routine for ??? 3Ah DWORD SHARE.EXE hook: pointer to FAR routine for ??? 3Eh DWORD SHARE.EXE hook -> FAR routine called on closing file??? 42h DWORD SHARE.EXE hook: pointer to ??? (called by AX=5D03h) 46h DWORD SHARE.EXE hook: pointer to ??? (called by AX=5D04h) 4Ah DWORD SHARE.EXE hook: pointer to ??? (called by AX=5D02h) 4Eh DWORD SHARE.EXE hook -> FAR routine to lock region of file call with BX = file handle CX:DX = starting offset SI:AX = size Return: CF set on error AL = DOS error code (see AH=59h) Note: only called if file is marked as remote 52h DWORD SHARE.EXE hook -> FAR routine to unlock region of file call with BX = file handle CX:DX = starting offset SI:AX = size Return: CF set on error AL = DOS error code (see AH=59h) Note: only called if file is marked as remote 56h DWORD SHARE.EXE hook -> FAR routine to check if file region is locked call with ES:DI -> system file table entry for file CX = length of region from current position in file Return: CF set if any portion of region locked AX = 0021h 5Ah DWORD SHARE.EXE hook: pointer to ??? (called by AX=5D05h) Return: CF set on error or not loaded CF clear if successful ES:DI -> ??? CX = ??? DX = ??? 5Eh DWORD SHARE.EXE hook: pointer to FAR routine for opening FCB??? call with ES:DI -> unopened FCB DS:SI -> system file table entry Return: BL = C0h??? Note: calls following fields from FCB to SFT: starting cluster of file 1Ah 0Bh sharing record offset 1Ch 33h file attribute 1Eh 04h 62h DWORD SHARE.EXE hook: pointer to FAR routine for ??? call with ES:DI -> system file table entry DS:SI -> FCB Return: CF set if SFT closed or sharing record offsets mismatched CF clear if successful BX = starting cluster number from FCB 66h DWORD SHARE.EXE hook: pointer to FAR routine for ??? Note: called during open/create of a file 6Ah DWORD SHARE.EXE hook: pointer to FAR routine for ??? 6Eh DWORD SHARE.EXE hook -> FAR routine to update directory info in related SFT entries call with ES:DI -> system file table entry for file (see below) AX = subfunction 00h: update time stamp (offset 0Dh) and date stamp (offset 0Fh) 01h: update file size (offset 11h) and starting cluster (offset 0Bh). Under some circumstances sets last read cluster fields to start of file 02h: as function 01h, but last-read fields always changed 03h: do both functions 00h and 02h Note: follows pointers at offset 2Bh in system file table ---DOS 4.x--- 10h WORD maximum bytes/block of any block device 12h DWORD pointer to disk buffer info (see below) 16h DWORD pointer to array of drive info (see below) 1Ah DWORD pointer to FCB table (if CONFIG.SYS contains FCBS=) 1Eh WORD size of FCB table 20h BYTE number of block devices 21h BYTE value of LASTDRIVE command in CONFIG.SYS (default 5) 22h 18 BYTEs actual NUL device driver header (not a pointer!) This is the first device on DOS's linked list of device drivers. (see below for format) 34h BYTE number of JOIN'ed drives??? Format of memory control block: Offset Size Description 00h BYTE block type: 5Ah if last block in chain, otherwise 4Dh 01h WORD PSP segment of owner, 0000h if free, 0008h if belongs to DOS 03h WORD size of memory block in paragraphs 05h 3 BYTEs unused ---DOS 3.x--- 08h 8 BYTEs unused ---DOS 4.x--- 08h 8 BYTEs ASCII program name if PSP memory block, else garbage null-terminated if less than 8 characters Format of DOS 2.x system file tables: Offset Size Description 00h DWORD pointer to next file table 04h WORD number of files in this table 06h 28h bytes per file Offset Size Description 00h BYTE number of file handles referring to this file 01h BYTE file open mode (see AH=3Dh) 02h BYTE file attribute 03h BYTE drive (0 = character device, 1 = A, 2 = B, etc) 04h 11 BYTEs filename in FCB format (no path,no period,blank-padded) 0Fh WORD ??? 11h WORD ??? 13h DWORD file size??? 17h WORD file date in packed format (see AX=5700h) 19h WORD file time in packed format (see AX=5700h) 1Bh BYTE device attribute (see AX=4400h) ---character device--- 1Ch DWORD pointer to device driver ---block device--- 1Ch WORD starting cluster of file 1Eh WORD relative cluster in file of last cluster read ------ 20h WORD absolute cluster number of current cluster 22h WORD ??? 24h DWORD current file position??? Format of DOS 3+ system file tables and FCB tables: Offset Size Description 00h DWORD pointer to next file table 04h WORD number of files in this table 06h 35h bytes per file Offset Size Description 00h WORD number of file handles referring to this file 02h WORD file open mode (see AH=3Dh) 04h BYTE file attribute 05h WORD device info word (see AX=4400h) 07h DWORD pointer to device driver header if character device else pointer to DOS Device Control Block (see AH=32h) 0Bh WORD starting cluster of file 0Dh WORD file time in packed format (see AX=5700h) 0Fh WORD file date in packed format (see AX=5700h) 11h DWORD file size 15h DWORD current offset in file 19h WORD relative cluster within file of last cluster read 1Bh WORD absolute cluster number of last cluster read 1Dh WORD number of sector containing directory entry 1Fh BYTE number of dir entry within sector (byte offset/32) 20h 11 BYTEs filename in FCB format (no path/period, blank-padded) 2Bh DWORD (SHARE.EXE) pointer to previous SFT sharing same file 2Fh WORD (SHARE.EXE) ??? 31h WORD PSP segment of file's owner (see AH=26h) 33h WORD offset within SHARE.EXE code segment of sharing record (see below) 0000h = none Format of sharing record: Offset Size Description 00h BYTE flag 00h free block 01h allocated block 01h WORD size of block 03h BYTE ??? 04h WORD offset in SHARE's DS of lock record (see below) 06h DWORD pointer to start of system file table chain for file 0Ah WORD ??? 0Ch var ASCIZ full pathname Format of SHARE.EXE lock record: Offset Size Description 00h WORD offset in SHARE's DS of next lock table in list 02h DWORD offset in file of start of locked region 06h DWORD offset in file of end of locked region 0Ah DWORD pointer to System File Table entry for this file 0Eh WORD ??? 0 appears to mean 'in use' Format of drive info table (array, 51h bytes [58h for DOS 4.x] per drive): Offset Size Description 00h 67 BYTEs current path as ASCIZ, starting with 'x:\' 43h WORD bit flags bit 15: network drive \ invalid drive if neither bit set bit 14: physical drive / bit 13: JOIN'ed, current path is actual path without JOIN drive letter in path may differ from logical drive name bit 12: SUBST'ed, current path is actual path without SUBST drive letter in path may differ from logical drive name 45h DWORD pointer to DOS Disk Block for this drive 49h WORD starting cluster of current dir 0000h = root, FFFFh never accessed 4Bh WORD ??? seems always to be FFFFh 4Dh WORD ??? seems always to be FFFFh 4Fh WORD Offset of '\' in current path field representing root directory of logical drive (2 if not SUBST'ed or JOIN'ed, otherwise number of bytes in SUBST/JOIN path) ---DOS 4.x--- 51h 7 BYTEs unknown, seems to always be zeros Format of device driver header: Offset Size Description 00h DWORD pointer to next driver or FFFFh if last driver 04h WORD device attributes Character device: bit 15 set bit 14 IOCTL supported bit 13 output until busy supported bit 12 reserved bit 11 OPEN/CLOSE/RemMedia calls supported bits 10-7 reserved bit 6 ??? (set by DOS 3.3 DISPLAY.SYS) bit 5 reserved bit 4 device is special (use INT 29 "fast console output") bit 3 device is CLOCK$ bit 2 device is NUL bit 1 device is standard output bit 0 device is standard input Block device: bit 15 clear bit 14 IOCTL supported bit 13 non-IBM format bit 12 reserved bit 11 OPEN/CLOSE/RemMedia calls supported bit 10 reserved bit 9 ??? set by DOS 3.3 DRIVER.SYS for "new" drives bit 8 ??? set by DOS 3.3 DRIVER.SYS for "new" drives bits 7-2 reserved bit 1 driver supports 32-bit sector addressing bit 0 reserved 06h WORD device strategy entry point call with ES:BX -> request header (see INT 2F/AX=1510h) 08h WORD device interrupt entry point 0Ah 8 BYTEs blank-padded character device name 12h WORD (CD-ROM driver) reserved, must be 0000h 14h BYTE (CD-ROM driver) drive letter (must initially be 00h) 15h BYTE (CD-ROM driver) number of units 16h 6 BYTEs (CD-ROM driver) signature 'MSCDnn' where 'nn' is version (currently '00') Format of DOS 2.x disk buffer: Offset Size Description 00h DWORD pointer to next disk buffer, offset = FFFFh if last 04h BYTE drive (0=A, 1=B, etc), FFh if not in use 05h 3 BYTEs unused??? (seems always to be 00h 00h 01h) 08h WORD logical sector number 0Ah BYTE number of copies to write (1 for non-FAT sectors) 0Bh BYTE sector offset between copies if multiple copies to be written 0Ch DWORD pointer to DOS Device Control Block (see AH=32h) 10h buffered data Format of DOS 3.x disk buffer: Offset Size Description 00h DWORD pointer to next disk buffer, offset = FFFFh if last 04h BYTE drive (0=A,1=B, etc), FFh if not in use 05h BYTE flags bit 7: ??? bit 6: buffer dirty bit 5: buffer in use bit 4: ??? bit 3: sector in data area bit 2: sector in a directory, either root or subdirectory bit 1: sector in FAT bit 0: boot sector??? (guess) 06h WORD logical sector number 08h BYTE number of copies to write (1 for non-FAT sectors) 09h BYTE sector offset between copies if multiple copies to be written 0Ah DWORD pointer to DOS Device Control Block (see AH=32h) 0Eh WORD unused??? (almost always 0) 10h buffered data Format of DOS 4.x disk buffer info: Offset Size Description 00h DWORD pointer to array of chain heads (see below) 04h WORD number of disk buffer chains (referred to as NDBCH below) 06h DWORD pointer to lookahead buffer, zero if not present 0Ah BYTE number of lookahead sectors, else zero (the y in BUFFERS=x,y) 0Bh WORD ??? seems always to be zero 0Dh WORD EMS handle for buffers, zero if not in EMS 0Fh WORD EMS physical page number used for buffers (usually 255) 11h WORD ??? seems always to be 1 13h WORD segment of EMS physical page frame 15h WORD ??? seems always to be zero 17h 4 WORDs EMS partial page mapping information??? Format of DOS 4.x disk buffer chain head (array, one entry per chain): Offset Size Description 00h WORD EMS logical page number in which chain is resident, garbage if not using EMS 02h DWORD pointer to least recently used buffer header. All buffers on this chain are in the same segment. 06h WORD ??? seems always to be zero Note: Buffered disk sectors are assigned to chain N where N is the sector's address modulo NDBCH, 0 <= N <= NDBCH-1. Each chain resides completely within one EMS page. This structure is in main memory even if buffers are in EMS. Format of DOS 4.x disk buffer: Offset Size Description 00h WORD forward ptr, offset only, to next least recently used buffer 02h WORD backward ptr, offset only 04h BYTE drive (0=A,1=B, etc), FFh if not in use 05h BYTE flags bit 7: ??? bit 6: buffer dirty??? bit 5: buffer in use??? bit 4: ??? bit 3: sector in data area bit 2: sector in a directory, either root or subdirectory bit 1: sector in FAT bit 0: ??? 06h DWORD logical sector number 0Ah BYTE number of copies to write for FAT sectors, same as number of FATs for data and directory sectors, usually 1 0Bh WORD offset in sectors between copies to write for FAT sectors 0Dh DWORD pointer to DOS Device Control Block (see AH=32h) 11h 3 BYTEs ??? zero or unset garbage 14h buffered data Note: All buffered sectors which have the same address modulo NDBCH are on the same doubly-linked circular chain. The links consist of offset addresses only, the segment being the same for all buffers in the chain. --------------------------------------------- INT 21 - DOS 2+ internal - TRANSLATE BIOS PARAMETER BLOCK AH = 53h DS:SI -> BPB (Bios Parameter Block) ES:BP -> buffer for DOS Disk Block Note: Translates BPB (see below) into a DOS Disk Block (see AH=32h). Format of BPB: Offset Size Description 00h WORD bytes/sector. Get from DDB bytes 2-3. 02h BYTE sectors/cluster. Get from (DDB byte 4) + 1 03h WORD reserved sectors. Get from DDB bytes 6-7 05h BYTE number of FATs. Get from DDB byte 8 06h WORD number of root dir entries. Get from DDB bytes 09h-0Ah 08h WORD total number of sectors. Get from: ((DDB bytes 0Dh-0Eh) - 1) * (sectors/cluster (BPB byte 2)) + (DDB Bytes 0Bh-0Ch) for DOS 4.0, set to zero if partition >32M, then set DWORD at 15h to actual number of sectors 0Ah BYTE media descriptor byte. Get from DDB byte 16h 0Bh WORD number of sectors/FAT. Get from DDB byte 0Fh ---DOS 3+--- 0Dh WORD number of sectors per track 0Fh WORD number of heads 11h DWORD number of hidden sectors 15h 11 BYTEs reserved ---DOS 4.0--- 15h DWORD total number of sectors if word at 08h contains zero --------------------------------------------- INT 21 - DOS 2+ - GET VERIFY FLAG AH = 54h Return: AL = 00h if flag OFF AL = 01h if flag ON --------------------------------------------- INT 21 - DOS 2+ internal - CREATE PSP AH = 55h DX = segment number at which to set up PSP (see AH=26h) SI = value to place in memory size field at DX:[0002h] Note: Like AH=26h but creates "child" PSP rather than copying existing one. --------------------------------------------- INT 21 - DOS 2+ - RENAME A FILE AH = 56h DS:DX -> ASCIZ old name ES:DI -> ASCIZ new name Return: CF set on error AX = error code (02h,03h,05h,11h) (see AH=59h) Note: allows move between directories on same logical volume (DOS 3+) allows renaming of directories --------------------------------------------- INT 21 - DOS 2+ - GET FILE'S DATE/TIME AX = 5700h BX = file handle Return: CF set on error AX = error code (01h,06h) (see AH=59h) CF clear if successful CX = time of last write bits 11-15: hour 5-10: minute 0-4: seconds/2 DX = date of last write bits 9-15: year-1980 5-8: month 0-4: day --------------------------------------------- INT 21 - DOS 2+ - SET FILE'S DATE/TIME AX = 5701h BX = file handle CX = time to be set (see AX=5700h) DX = date to be set (see AX=5700h) Return: CF set on error AX = error code (01h,06h) (see AH=59h) --------------------------------------------- INT 21 - DOS 4.0 - ??? AX = 5702h ??? Return: ??? --------------------------------------------- INT 21 - DOS 4.0 - ??? AX = 5704h ??? Return: ??? --------------------------------------------- INT 21 - DOS 3+ - GET/SET MEMORY ALLOCATION STRATEGY AH = 58h AL = function code 00h get allocation strategy 01h set allocation strategy BL = strategy code 00h first fit (use first memory block large enough) 01h best fit (use smallest memory block large enough) 02h last fit (use high part of last usable memory block) Return: CF set on error AX = error code (01h) (see AH=59h) CF clear if successful AX = strategy code Note: the Set subfunction accepts any value in BL; 2 or greater means last fit. the Get subfunction returns the last value set, so programs should check whether the value is >= 2, not just equal to 2. --------------------------------------------- INT 21 - DOS 3+ - GET EXTENDED ERROR CODE AH = 59h BX = version code (0000h for DOS 3.x) Return: AX = extended error code (see below) BH = class of error (see below) BL = suggested action (see below) CH = locus (where error occurred) (see below) CL, DX, SI, DI, BP, DS, and ES destroyed Values for extended error code: 01h function number invalid 02h file not found 03h path not found 04h too many open files (no handles available) 05h access denied 06h invalid handle 07h memory control block destroyed 08h insufficient memory 09h memory block address invalid 0Ah environment invalid 0Bh format invalid 0Ch access code invalid 0Dh data invalid 0Fh invalid drive 10h attempted to remove current directory 11h not same device 12h no more files 13h disk write-protected 14h unknown unit 15h drive not ready 16h unknown command 17h data error (CRC) 18h bad request structure length 19h seek error 1Ah unknwon media type (non-DOS disk) 1Bh sector not found 1Ch printer out of paper 1Dh write fault 1Eh read fault 1Fh general failure 20h sharing violation 21h lock violation 22h disk change invalid ES:DI -> ASCIZ volume label of required disk 23h FCB unavailable 24h sharing buffer overflow 25h-31h reserved 32h Network request not supported (DOS 3.1 + MS Networks) 33h Remote computer not listening 34h Duplicate name on network 35h Network name not found 36h Network busy 37h Network device no longer exists 38h Network BIOS command limit exceeded 39h Network adapter hardware error 3Ah Incorrect response from network 3Bh Unexpected network error 3Ch Incompatible remote adapter 3Dh Print queue full 3Eh Queue not full 3Fh Not enough space to print file 40h Network name was deleted 41h Network: Access denied 42h Network device type incorrect 43h Network name not found 44h Network name limit exceeded 45h Network BIOS session limit exceeded 46h Temporarily paused 47h Network request not accepted 48h Print/disk redirection paused (DOS 3.1 + MS Networks) 49h-4Fh reserved 50h file exists 51h reserved 52h cannot make directory 53h fail on INT 24h 54h (DOS 3.3+) too many redirections 55h (DOS 3.3+) duplicate redirection 56h (DOS 3.3+) invalid password 57h (DOS 3.3+) invalid parameter 58h (DOS 3.3+) network write fault Values for Error Class: 01h out of resource (storage space or I/O channels) 02h temporary situation (file or record lock) 03h authorization (denied access) 04h internal (system software bug) 05h hardware failure 06h system failure (configuration file missing or incorrect) 07h application program error 08h not found 09h bad format 0Ah locked 0Bh media error 0Ch already exists 0Dh unknown Values for Suggested Action: 01h retry 02h delayed retry 03h prompt user to reenter input 04h abort after cleanup 05h immediate abort 06h ignore 07h retry after user intervention Values for Error Locus: 01h unknown or not appropriate 02h block device (disk error) 03h network related 04h serial device (timeout) 05h memory related --------------------------------------------- INT 21 - DOS 3+ - CREATE UNIQUE FILE AH = 5Ah DS:DX -> ASCIZ directory path name ending with a '\' + 13 bytes to receive generated filename CX = file attributes (only bits 0,1,2,5 may be set) Return: CF set on error AX = error code (03h,05h) (see AH=59h) CF clear if successful AX = file handle DS:DX -> path name Note: The file created is not truly temporary. It MUST be removed by the user. --------------------------------------------- INT 21 - DOS 3+ - CREATE NEW FILE AH = 5Bh DS:DX -> ASCIZ directory path name CX = file attribute Return: CF set on error AX = error code (03h,04h,05h,50h) (see AH=59h) CF clear if successful DS:DX -> path name Note: Unlike function 3Ch, function 5Bh will fail if the file already exists. --------------------------------------------- INT 21 - DOS 3+ - LOCK/UNLOCK FILE ACCESS AH = 5Ch AL = 00h lock 01h unlock BX = file handle CX:DX = starting offset of region to lock SI:DI = size of region to lock Return: CF set on error AX = error code (01h,06h,21h) (see AH=59h) Note: error returned unless SHARE or network installed --------------------------------------------- INT 21 - DOS 3.1 internal - INDIRECT FUNCTION CALL AX = 5D00h DS:DX -> buffer containing register values (see AX=5D0Ah) for a call to INT 21h Return: as appropriate for function being called Notes: does not check AH. Out of range values will crash the system --------------------------------------------- INT 21 - DOS 3.1 internal - SYNC??? AX = 5D01h DS:DX -> buffer (see AX=5D0Ah), only fields at offset 12h, 14h used ??? Return: ??? Note: does something to each disk file in the System File Table which has been written to; if remote file, calls INT 2F/AX=1107h seems to update the time stamp of all open files which have been written --------------------------------------------- INT 21 - DOS 3.1 internal - SHARE.EXE - ??? AX = 5D02h DS:DX -> buffer (see AX=5D0Ah), only fields at offset 12h, 14h used ??? Return: ??? Note: error unless SHARE is loaded (calls [ListofLists+4Ah]) (see AH=52h) --------------------------------------------- INT 21 - DOS 3.1 internal - SHARE.EXE - ??? AX = 5D03h DS:DX -> buffer (see AX=5D0Ah), only fields at offset 12h, 14h used ??? Return: ??? Note: error unless SHARE is loaded (calls [ListofLists+42h]) (see AH=52h) --------------------------------------------- INT 21 - DOS 3.1 internal - SHARE.EXE - ??? AX = 5D04h DS:DX -> buffer (see AX=5D0Ah), only fields at offset 12h, 14h used ??? Return: ??? Note: error unless SHARE is loaded (calls [ListofLists+46h]) (see AH=52h) --------------------------------------------- INT 21 - DOS 3.1 internal - SHARE.EXE - ??? AX = 5D05h DS:DX -> buffer (see AX=5D0Ah), only fields at offset 12h, 14h used ??? Return: ES:DI -> ??? BX = ??? CX = ??? Note: error unless SHARE is loaded (calls [ListOfLists+5Ah]) (see AH=52h) --------------------------------------------- INT 21 - DOS 3+ internal - GET ADDRESS OF CRITICAL ERROR FLAG AX = 5D06h DS:DX -> buffer (see AX=5D0Ah), only fields at offset 12h, 14h used Return: DS:SI -> critical error flag BX = ??? CX = ??? Notes: this call does a lot of other work in addition to returning the pointer setting CritErr flag allows use of functions 50h/51h from INT 28h under DOS 2.x by forcing use of correct stack --------------------------------------------- INT 21 - DOS 3+ internal - ??? AH = 5Dh AL = subfunction 07h: ??? 08h: ??? (used by COMMAND.COM) 09h: ??? (used by COMMAND.COM) Return: ??? Note: in DOS 3.10 and 3.30, these are identical, and call INT 2F/AX=1125h --------------------------------------------- INT 21 - DOS 3.1+ internal - SET EXTENDED ERROR INFORMATION AX = 5D0Ah DS:DX -> 11-word error information table Format of error information table: Offset Size Description 00h WORD value that next call to function 59h will return in AX 02h WORD value that next call to function 59h will return in BX 04h WORD CX 06h WORD DX 08h WORD SI 0Ah WORD DI 0Ch WORD DS 0Eh WORD ES 10h WORD reserved (0) 12h WORD ??? (0 for DOS 3.1) 14h WORD ??? (0 for DOS 3.1) --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - GET MACHINE NAME AX = 5E00h DS:DX -> buffer for ASCIZ name (16 bytes) Return: CF set on error AX = error code (01h) (see AH=59h) CH = 00h if name not defined <> 00h defined CL = NETBIOS name number DS:DX -> ASCIZ machine name --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - SET MACHINE NAME AX = 5E01h CH = 00h undefine name <> 0 define name CL = name number DS:DX -> ASCIZ name --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - SET PRINTER SETUP AX = 5E02h BX = redirection list index CX = length of setup string (<= 64) DS:SI -> string buffer Return: CF set on error AX = error code (01h) (see AH=59h) --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - GET PRINTER SETUP AX = 5E03h BX = redirection list index ES:DI -> string buffer Return: CF set on error AX = error code (01h) (see AH=59h) CX = length of setup string (<= 64) --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - something to do with PRINTER SETUP??? AX = 5E04h ??? Return: CF set on error Note: calls INT 2F/AX=111Fh with 5E04h on stack --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - something to do with PRINTER SETUP??? AX = 5E05h ??? Return: CF set on error Note: calls INT 2F/AX=111Fh with 5E05h on stack --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - something to do with PRINTER SETUP??? AX = 5E06h ??? Return: CF set on error Note: calls INT 2F/AX=111Fh with 5E06h on stack --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - GET REDIRECTION LIST ENTRY AX = 5F02h BX = redirection list index DS:SI -> 16 char local device name buffer ES:DI -> 128 char network name buffer Return: CF set on error AX = error code (01h,12h) (see AH=59h) BH = device status flag (bit 0 = 0 if valid) BL = device type (03h if printer, 04h if drive) CX = stored parameter value (user data) Note: DX and BP are destroyed by this call! --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - REDIRECT DEVICE AX = 5F03h BL = device type 03 = printer device 04 = file device CX = stored parameter value DS:SI -> ASCIZ source device name ES:DI -> destination ASCIZ network path + ASCIZ password Return: CF set on error AX = error code (01h,03h,05h,08h) (see AH=59h) --------------------------------------------- INT 21 - DOS 3.1 + Microsoft Networks - CANCEL REDIRECTION AX = 5F04h DS:SI -> ASCIZ device name or network path Return: CF set on error AX = error code (01h,0Fh) (see AH=59h) --------------------------------------------- INT 21 - DOS 3+ internal - RESOLVE PATH STRING TO FULLY QUALIFIED PATH STRING AH = 60h DS:SI -> ASCIZ relative path string ES:DI -> 80-byte buffer for ASCIZ fully qualified name Return: CF set on error AX = error code 02h invalid source name 03h invalid drive or malformed path others??? CF clear if successful AX = ??? (0000h, 0040h, 004Eh, 0050h, 005Ch seen) buffer filled with qualified name of form D:\PATH\FILE.EXT Note: if path string is on a JOINed drive, the returned name is the one that would be needed if the drive were not JOINed; similarly for a SUBSTed drive letter. Because of this, it is possible to get a qualified name that is not legal with the current combination of SUBSTs and JOINs --------------------------------------------- INT 21 - DOS 3+ internal - UNUSED AH = 61h Return: AL = 00h --------------------------------------------- INT 21 - DOS 3+ - GET PSP ADDRESS AH = 62h Return: BX = segment address of PSP Note: under DOS 3+, this function does not use any of the DOS-internal stacks and is thus fully reentrant --------------------------------------------- INT 21 - DOS 2.25 only - GET LEAD BYTE TABLE (2-BYTE CHARACTER SUPPORT) AH = 63h AL = subfunction 00h get system lead byte table Return: DS:SI -> lead byte table 01h set/clear interim console flag (determine whether interim bytes are returned on some console functions) DL = 01h/00h to set/clear interim console flag 02h get interim console flag Return: DL = interim console flag Return: CF set on error AX = error code (01h) (see AH=59h) Note: does not preserve any registers other than SS:SP --------------------------------------------- INT 21 - DOS 3.2 internal - ??? AH = 64h AL = subfunction 00h get ??? Return: DL = ??? 01h set ??? DL = ??? 02h get and set ??? DL = new ??? Return: DL = old ??? --------------------------------------------- INT 21 - DOS 3.3 internal - ??? AH = 64h AL = flag 00h ??? nonzero ??? Return: nothing Note: seems to have something to do with the network --------------------------------------------- INT 21 - DOS 3.3+ - GET EXTENDED COUNTRY INFORMATION AH = 65h AL = info ID 01h get general internationalization info 02h get pointer to uppercase table 04h get pointer to filename uppercase table 06h get pointer to collating sequence table 07h (DOS 4.x) get pointer to Double-Byte Character Set table BX = code page (-1=global code page) DX = country ID (-1=current country) ES:DI -> country information buffer CX = size of buffer (>= 5) Return: CF set on error AX = error code (see AH=59h) CF clear if succesful CX = size of country information returned ES:DI -> country information Format of country information: Offset Size Description 00h BYTE info ID ---if info ID = 01h--- 01h WORD size 03h WORD country ID 05h WORD code page 07h 34 BYTEs country-dependent info (see AH=38h) ---if info ID = 02h--- 01h DWORD pointer to uppercase table (see below) ---if info ID = 04h--- 01h DWORD pointer to collating table (see below) ---if info ID = 06h--- 01h DWORD pointer to filename uppercase table (see below) ---if info ID = 07h (DOS 4.x)--- 01h DWORD pointer to DBCS lead byte table (see below) Format of uppercase table: Offset Size Description 00h WORD table size 02h 128 BYTEs uppercase equivalents (if any) of chars 80h to FFh Format of collating table: Offset Size Description 00h WORD table size 02h 256 BYTEs values used to sort characters 00h to FFh Format of filename uppercase table: Offset Size Description 00h WORD table size 02h 128 BYTEs uppercase equivalents (if any) of chars 80h to FFh Format of DBCS lead byte table: Offset Size Description 00h WORD length 02h 2N BYTEs start/end for N lead byte ranges WORD 0000h (end of table) --------------------------------------------- INT 21 - DOS 3.3+ - GET GLOBAL CODE PAGE TABLE AX = 6601h Return: CF set on error AX = error code (see AH=59h) CF clear if successful BX = active code page DX = system code page --------------------------------------------- INT 21 - DOS 3.3+ - SET GLOBAL CODE PAGE TABLE AX = 6602h BX = active code page 437 US 850 Multilingual 860 Portugal 863 Canada (French) 865 Norway/Denmark DX = system code page (active page at boot time) Return: CF set on error AX = error code (see AH=59h) --------------------------------------------- INT 21 - DOS 3.3+ - SET HANDLE COUNT AH = 67h BX = desired number of handles (max 255) Return: CF set if error (and error code in AX) --------------------------------------------- INT 21 - DOS 3.3+ - COMMIT FILE, WRITE ALL BUFFERED DATA TO DISK AH = 68h BX = file handle Return: CF set on error AX = error code (see AH=59h) Note: if BX <= 20, no action is taken --------------------------------------------- INT 21 - DOS 4.0 internal - GET/SET DISK SERIAL NUMBER AH = 69h AL = subfunction 00h get serial number 01h set serial number BL = drive (0=default, 1=A, 2=B, etc) DS:DX -> disk info (see below) Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX destroyed (AL = 00h) buffer filled with appropriate values from extended BPB (AL = 01h) extended BPB on disk set to values from buffer Notes: does not generate a critical error; all errors are returned in AX error 0005h given if no extended BPB on disk does not work on network drives (error 0001h) buffer after first two bytes is exact copy of bytes 27h thru 3Dh of extended BPB on disk Format of disk info: Offset Size Description 00h WORD ??? (zero) 02h DWORD disk serial number (binary) 06h 11 BYTEs volume label or "NO NAME " if none present 11h 8 BYTEs FAT type--string "FAT12 " or "FAT16 " --------------------------------------------- INT 21 - DOS 4.0 internal - ??? AH = 6Ah ??? Return: ??? --------------------------------------------- INT 21 - DOS 4.0 internal - ??? AH = 6Bh ??? Return: ??? --------------------------------------------- INT 21 - DOS 4.0 - EXTENDED OPEN/CREATE AX = 6C00h BL = open mode as in AL for normal open (INT 21h/AH=3Dh) bits 0-2: access mode bit 3 reserved bits 4-6: sharing mode bit 7: inheritance BH = 0WF00000 W = auto commit on write F = return error rather than doing INT 24h CX = create attribute bit 0: readonly bit 1: hidden bit 2: system bit 3: volume label bit 4: reserved bit 5: archive bits 6-15 reserved DL = action if file exists/does not exists bits 7-4 action if file does not exist 0000 fail 0001 create bits 3-0 action if file exists 0000 fail 0001 open 0010 replace/open DH = 00h (reserved) DS:SI -> ASCIZ file name Return: CF set on error AX = error code (see AH=59h) CF clear if successful AX = file handle CX = 1 file opened 2 file created 3 file replaced --------------------------------------------- INT 21 - ??? AH = 89h ??? Note: called by Microsoft C 4.0 startup code --------------------------------------------- INT 21 - Novell NetWare SFT Level II - EXTENDED FILE ATTRIBUTES AH = B6h AL = subfunction 00h get extended file attributes 01h set extended file attributes CL = attributes bit 4: transaction tracking file 5: indexing file (to be implemented) 6: read audit (to be implemented) 7: write audit (to be implemented) DS:DX -> ASCIZ pathname Return: CF set on error AL = error code FFh file not found 8Ch caller lacks privileges CL = current extended file attributes --------------------------------------------- INT 21 - Novell Advanced NetWare 2.0+ - PRINT JOBS AH = B8h AL = subfunction 00h get default print job flags 01h set default capture flags 02h get specific capture flags 03h set specific print job flags 04h get default local printer 05h set default local printer 06h set capture print queue 07h set capture print job 08h get banner user name 09h set banner user name CX = buffer size ES:BX -> buffer Return: none --------------------------------------------- INT 21 - Novell NetWare 4.0 - SET END OF JOB STATUS AH = BBh AL = new EOJ flag 00h disable EOJs otherwise enable EOJs Return: AL = old EOJ flag --------------------------------------------- INT 21 - Novell NetWare 4.6 - LOG PHYSICAL RECORD AH = BCh AL = flags bit 0: lock as well as log record 1: non-exclusive lock BX = file handle CX:DX = offset BP = timeout in timer ticks (1/18 sec) SI:DI = length Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - RELEASE PHYSICAL RECORD AH = BDh BX = file handle CX:DX = offset Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - CLEAR PHYSICAL RECORD AH = BEh BX = file handle CX:DX = offset Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - LOG RECORD (FCB) AH = BFh AL = flags bit 0: lock as well as log record 1: non-exclusive lock DS:DX -> FCB BX:CX = offset BP = timeout in timer ticks (1/18 sec) SI:DI = length Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - RELEASE RECORD (FCB) AH = C0h DS:DX -> FCB BX:CX = offset Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - CLEAR RECORD (FCB) AH = C1h DS:DX -> FCB BX:CX = offset Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - LOCK PHYSICAL RECORD SET AH = C2h AL = flags bit 1: non-exclusive lock BP = timeout in timer ticks (1/18 sec) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - RELEASE PHYSICAL RECORD SET AH = C3h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - CLEAR PHYSICAL RECORD SET AH = C4h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - SEMAPHORES AH = C5h AL = subfunction 00h open semaphore DS:DX -> semaphore name CL = initial value 01h examine semaphore Return: CX = semaphore value (sign extended) DL = open count 02h wait on semaphore BP = timeout in timer ticks (1/18 sec) 03h signal semaphore 04h close semaphore CX:DX = semaphore handle (except function 00h) Return: AL = error code if function 00h CX:DX = semaphore handle BL = open count --------------------------------------------- INT 21 - Novell NetWare 4.6 - GET OR SET LOCK MODE AH = C6h AL = subfunction 00h set old "compatibility" mode 01h set new extended locks mode 02h get lock mode Return: AL = current lock mode --------------------------------------------- INT 21 - Novell NetWare 4.0 - TTS AH = C7h AL = subfunction 00h begin transaction (NetWare SFT level II) Return: AL = error code 01h end transaction (NetWare SFT level II) Return: AL = error code CX:DX = transaction reference number 02h TTS available (NetWare SFT level II) Return: AL = completion code 00h TTS not available 01h TTS available FDh TTS available but disabled 03h abort transaction (NetWare SFT level II) Return: AL = error code 04h transaction status 05h get application thresholds 06h set application thresholds 07h get workstation thresholds 08h set workstation thresholds Return: ??? --------------------------------------------- INT 21 - Novell NetWare 4.0 - BEGIN LOGICAL FILE LOCKING AH = C8h if function C6h lock mode 00h: DL = mode 00h no wait 01h wait if function C6h lock mode 01h: BP = timeout in timer ticks (1/18 sec) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - END LOGICAL FILE LOCKING AH = C9h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - LOG PERSONAL FILE (FCB) AH = CAh DS:DX -> FCB if function C6h lock mode 01h: AL = log and lock flag 00h log file only 01h lock as well as log file BP = timeout in timer ticks (1/18 sec) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - LOCK FILE SET AH = CBh if function C6h lock mode 00h: DL = mode 00h no wait 01h wait if function C6h lock mode 01h: BP = timeout in timer ticks (1/18 sec) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - RELEASE FILE (FCB) AH = CCh DS:DX -> FCB Return: none --------------------------------------------- INT 21 - Novell NetWare 4.0 - RELEASE FILE SET AH = CDh Return: none --------------------------------------------- INT 21 - Novell NetWare 4.0 - CLEAR FILE (FCB) AH = CEh DS:DX -> FCB Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - CLEAR FILE SET AH = CFh Return: AL = 00h --------------------------------------------- INT 21 - Novell NetWare 4.6 - LOG LOGICAL RECORD AH = D0h DS:DX -> record string if function C6h lock mode 01h: AL = flags bit 0: lock as well as log the record bit 1: non-exclusive lock BP = timeout in timer ticks (1/18 sec) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - LOCK LOGICAL RECORD SET AH = D1h if function C6h lock mode 00h: DL = mode 00h no wait 01h wait if function C6h lock mode 01h: BP = timeout in timer ticks (1/18 sec) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - RELEASE LOGICAL RECORD AH = D2h DS:DX -> record string Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - RELEASE LOGICAL RECORD SET AH = D3h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - CLEAR LOGICAL RECORD AH = D4h DS:DX -> record string Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - CLEAR LOGICAL RECORD SET AH = D5h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - END OF JOB AH = D6h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - SYSTEM LOGOUT AH = D7h Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - GET VOLUME STATISTICS AH = DAh DL = volume number ES:DI -> reply buffer (see below) Return: AL = 00h Format of reply buffer: Offset Size Description 00h WORD sectors/block 02h WORD total blocks 04h WORD unused blocks 06h WORD total directory entries 08h WORD unused directory entries 0Ah 16 BYTEs volume name, null padded 1Ah WORD removable flag, 0000h = not removable --------------------------------------------- INT 21 - Novell NetWare 4.0 - GET NUMBER OF LOCAL DRIVES AH = DBh Return: AL = number of local disks --------------------------------------------- INT 21 - Novell NetWare 4.0 - GET STATION NUMBER AH = DCh Return: AL = station number 00h if NetWare not loaded or this machine is a non-dedicated server CX = station number in ASCII --------------------------------------------- INT 21 - Novell NetWare 4.0 - SET ERROR MODE AH = DDh DL = error mode 00h display critical I/O errors 01h extended errors for all I/O in AL 02h extended errors for critical I/O in AL Return: AL = previous error mode --------------------------------------------- INT 21 - Novell NetWare 4.0 - SET BROADCAST MODE AH = DEh AL = broadcast mode 00h receive console and workstation broadcasts 01h receive console broadcasts only 02h receive no broadcasts 03h store all broadcasts for retrieval 04h get broadcast mode 05h disable shell tiemr interrupt checks 06h enable shell timer interrupt checks Return: AL = old broadcast mode --------------------------------------------- INT 21 - Novell NetWare 4.0 - CAPTURE AH = DFh AL = subfunction 00h start LPT capture 01h end LPT capture 02h cancel LPT capture 03h flush LPT capture 04h start specific capture 05h end specific capture 06h cancel specific capture 07h flush specific capture Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - PRINT SPOOLING AH = E0h DS:SI -> request buffer ES:DI -> reply buffer subfunction in third byte of request buffer 00h spool data to a capture file 01h close and queue capture file 02h set spool flags 03h spool existing file 04h get spool queue entry 05h remove entry from spool queue 06h get printer status 09h create a disk capture file Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - BROADCAST MESSAGES AH = E1h DS:SI -> request buffer ES:DI -> reply buffer subfunction in third byte of request buffer 00h send broadcast message 01h get broadcase message 02h disable station broadcasts 03h enable station broadcasts 04h send personal message 05h get personal message 06h open message pipe 07h close message pipe 08h check pipe status 09h broadcast to console Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - DIRECTORY FUNCTIONS AH = E2h DS:SI -> request buffer ES:DI -> reply buffer subfunction in third byte of request buffer 00h set directory handle 01h get directory path 02h scan directory information 03h get effective directory rights 04h modify maximum rights mask 05h get volume number 06h get volume name 0Ah create directory 0Bh delete directory 0Ch scan directory for trustees 0Dh add trustee to directory 0Eh delete trustee from directory 0Fh rename directory 10h purge erased files 11h restore erased file 12h allocate permanent directory handle 13h allocate temporary directory handle 14h deallocate directory handle 15h get volume info with handle 16h allocate special temporary directory handle 17h retrieve a short base handle (Advanced NetWare 2.0) 18h restore a short base handle (Advanced NetWare 2.0) 19h set directory information Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - CONNECTION CONTROL AH = E3h DS:SI -> requst buffer ES:DI -> reply buffer subfunction in third byte of request buffer 00h login 01h change password 02h map user to station set 03h map object to number 04h map number to object 05h get station's logged information 06h get station's root mask (obsolete) 07h map group name to number 08h map number to group name 09h get memberset M of group G 0Ah enter login area 0Bh ??? 0Ch ??? 0Dh log network message 0Eh get disk utilization (Advanced NetWare 1.0) 0Fh scan file information (Advanced NetWare 1.0) 10h set file information (Advanced NetWare 1.0) 11h get file server information (Advanced NetWare 1.0) 12h ??? 13h get internet address (Advanced NetWare 1.02) 14h login to file server (Advanced NetWare 2.0) 15h get object connection numbers (Advanced NetWare 2.0) 16h get connection information (Advanced NetWare 1.0) 32h create object (Advanced NetWare 1.0) 33h delete object (Advanced NetWare 1.0) 34h rename object (Advanced NetWare 1.0) 35h get object ID (Advanced NetWare 1.0) 36h get object name (Advanced NetWare 1.0) 37h scan object (Advanced NetWare 1.0) 38h change object security (Advanced NetWare 1.0) 39h create propery (Advanced NetWare 1.0) 3Ah delete property (Advanced NetWare 1.0) 3Bh change property security (Advanced NetWare 1.0) 3Ch scan property (Advanced NetWare 1.0) 3Dh read property value (Advanced NetWare 1.0) 3Eh write property value (Advanced NetWare 1.0) 3Fh verify object password (Advanced NetWare 1.0) 40h change object password (Advanced NetWare 1.0) 41h add object to set (Advanced NetWare 1.0) 42h delete object from set (Advanced NetWare 1.0) 43h is object in set? (Advanced NetWare 1.0) 44h close bindery (Advanced NetWare 1.0) 45h open bindery (Advanced NetWare 1.0) 46h get bindery access level (Advanced NetWare 1.0) 47h scan object trustee paths (Advanced NetWare 1.0) C8h check console priviledges C9h get file server description strings CAh set file server date and time CBh disable file server login CCh enable file server login CDh get file server login status CEh purge all erased files CFh disable transaction tracking D0h enable transaction tracking D1h send console broadcast D2h clear connection number D3h down file server D4h get file system statistics D5h get transaction tracking statistics D6h read disk cache statistics D7h get drive mapping table D8h read physical disk statistics D9h get disk channel statistics DAh get connection's task information DBh get list of connection's open files DCh get list of connections using a file DDh get physical record locks by connection and file DEh get physical record locks by file DFh get logical records by connection E0h get logical record information E1h get connection's semaphores E2h get semaphore information E3h get LAN driver's configuration information E5h get connection's usage statistics E6h get object's remaining disk space E7h get server LAN I/O statistics E8h get server miscellaneous information E9h get volume information Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - SET FILE ATTRIBUTES (FCB) AH = E4h CL = file attributes bit 0: read only 1: hidden 2: system 7: shareable DX:DX -> FCB Return: AL = error code --------------------------------------------- INT 21 - DoubleDos - INSTALLATION CHECK AX = E400h Return: AL <> 00h if DoubleDos is active --------------------------------------------- INT 21 - Novell NetWare 4.0 - UPDATE FILE SIZE (FCB) AH = E5h DS:DX -> FCB Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - COPY FILE TO FILE (FCB) AH = E6h CX:DX = number of bytes to copy DS:SI -> source FCB ES:DI -> destination FCB Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.0 - GET FILE SERVER DATE AND TIME AH = E7h DS:DX -> reply buffer BYTE year - 1900 BYTE month BYTE day BYTE hours BYTE minutes BYTE seconds BYTE day of week (0 = Sunday) Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - SET FCB RE-OPEN MODE AH = E8h DL = mode 00h no automatic re-open 01h auto re-open Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - SHELL'S "GET BASE STATUS" AH = E9h AL = subfunction 00h get directory handle DX = drive number to check (0 = A:) Return: AL = network pathbase AH = base flags 00h drive not currently mapped to a base 01h drive is mapped to a permanent base 02h drive is mapped to a temporary base 03h drive exists locally --------------------------------------------- INT 21 - Novell NetWare 4.6 - RETURN SHELL VERSION AH = EAh AL = subfunction 00h return code in AL Return: AL = hardware type 00h IBM PC 01h Victor 9000 01h get workstation environment string ES:DI -> 40-byte buffer Return: buffer filled with three null-terminated entries: major operating system version hardware type Return: AH = 00h if DOS --------------------------------------------- INT 21 - DoubleDos - TURN OFF TASK SWITCHING AH = EAh Return: task switching turned off --------------------------------------------- INT 21 - Novell NetWare 4.6 - LOG FILE AH = EBh DS:DX -> ASCIZ filename if function C6h lock mode 01h: AL = flags 00h log file only 01h lock as well as log file BP = timeout in timer ticks (1/18 second) Return: AL = error code --------------------------------------------- INT 21 - DoubleDos - TURN ON TASK SWITCHING AH = EBh Return: task switching turned on --------------------------------------------- INT 21 - Novell NetWare 4.6 - RELEASE FILE AH = ECh DS:DX -> ASCIZ filename Return: none --------------------------------------------- INT 21 - DoubleDos - GET VIRTUAL SCREEN ADDRESS AH = ECh Return: ES = segment of virtual screen Note: screen address can change if task-switching is on!! --------------------------------------------- INT 21 - Novell NetWare - CLEAR FILE AH = EDh DS:DX -> ASCIZ filename Return: AL = error code --------------------------------------------- INT 21 - Novell NetWare 4.6 - GET PHYSICAL STATION NUMBER AH = EEh Return: CX:BX:AX = six-byte address --------------------------------------------- INT 21 - DoubleDos - GIVE AWAY TIME TO OTHER TASKS AH = EEh AL = number of 55ms time slices to give away Return: returns after giving away time slices --------------------------------------------- INT 21 - Novell Advanced NetWare 1.0+ - GET DRIVE INFO AH = EFh AL = subfunction 00h get drive handle table 01h get drive flag table 02h get drive connection ID table 03h get connection ID table 04h get file server name table Return: ES:DI -> shell status table --------------------------------------------- INT 21 - Novell Advanced NetWare 1.0+ - CONNECTION ID AH = F0h AL = subfunction 00h set preferred connection ID 01h get preferred connection ID 02h get default connection ID 03h LPT capture active 04h set primary connection ID 05h get primary connection ID DL = preferred file server Return: AL = selected file server --------------------------------------------- INT 21 - Novell Advanced NetWare 1.0+ - FILE SERVER CONNECTION AH = F1h AL = subfunction 00h attach to file server DL = preferred file server 01h detach from file server 02h logout from file server Return: AL = completion code --------------------------------------------- INT 21 - Novell NetWare - ??? AH = F2h ??? Return: ??? --------------------------------------------- INT 21 - Novell Advanced NetWare 2.0+ - FILE SERVER FILE COPY AH = F3h ES:DI -> request string (see below) Return: AL = status/error code CX:DX = number of bytes copied Format of request string: Offset Size Description 00h WORD source file handle 02h WORD destination file handle 04h DWORD starting offset in source 08h DWORD starting offset in destination 0Ch DWORD number of bytes to copy --------------------------------------------- INT 21 - CED - INSTALLABLE COMMANDS AH = FFh AL = 00h add installable command BL = mode - bit 0 = 1 callable from DOS prompt bit 1 = 1 callable from application DS:SI -> CR-terminated command name ES:DI -> FAR routine entry point AL = 01h remove installable command DS:SI -> CR-terminated command name AL = 02h reserved, may be used to test for CED installation Return: CF set on error AX = 01h invalid function 02h command not found (subfunction 01h only) 08h insufficient memory (subfunction 00h only) 0Eh bad data (subfunction 00h only) AH = 0FFh if CED not installed --------------------------------------------- INT 22 - DOS - TERMINATE ADDRESS FAR (DWORD) address of routine to be executed when program "returns to DOS". Should NEVER be called directly. --------------------------------------------- INT 23 - DOS - CONTROL "C" EXIT ADDRESS Automatically called from keyboard scanner when CTRL-C or CTRL-BREAK is detected. Normally aborts program and returns to DOS, but may be changed. --------------------------------------------- INT 24 - DOS - FATAL ERROR HANDLER ADDRESS Automatically called upon detection of unrecoverable I/O error. Normally points to routine in resident part of COMMAND.COM that prints "Abort, Retry, Ignore?" message and takes the reply, but may be overridden if desired. Provides the following values in registers on entry to interrupt handler: AH: bit 7 = 0 disk I/O error = 1 other error -- if block device, bad FAT -- if char device, 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 = 1, otherwise undefined BP:SI -> header of device driver for which error occurred block device if high bit of BP:[SI+4] set low byte of DI: 00h write-protect error 01h unknown unit 02h drive not ready 03h unknown command 04h data error (bad CRC) 05h bad 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 (DOS 3+) invalid disk change 10h (DOS 3+) FCB unavailable 11h (DOS 3+) sharing buffer overflow Handler must return AL = 00h ignore error = 01h retry operation = 02h terminate program through INT 22h = 03h fail system call in progress (DOS 3+) --------------------------------------------- INT 25 - DOS - ABSOLUTE DISK READ (except DOS 4.0/COMPAQ DOS 3.31 >32M partitn) AL = drive number (0=A, 1=B, etc) DS:BX = Disk Transfer Address (buffer) CX = number of sectors to read DX = first relative sector to read Return: CF set on error AL = error code issued to INT 24h in low half of DI AH = 80h if attachment failed to respond 40h if seek operation failed 20h if controller failed 10h if data error (bad CRC) 08h if DMA failure 04h if requested sector not found 03h if write-protected disk 02h if bad address mark 01h if bad command Note: ORIGINAL FLAGS ON STACK! May destroy all registers except segment regs BUG: DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an invalid drive number --------------------------------------------- INT 25 - DOS 4.0/COMPAQ DOS 3.31 - ABSOLUTE DISK READ (>32M hard-disk partitn) AL = drive number (0=A, 1=B, etc) CX = FFFFh DS:BX -> disk read packet (see below) Return: same as above??? Note: partition is potentially >32M (and requires this form of the call) if bit 1 of device attribute word in device driver is set Format of disk read packet: Offset Size Description 00h DWORD sector number 04h WORD number of sectors to read 06h DWORD transfer address --------------------------------------------- INT 26 - DOS - ABSOLUTE DISK WRITE (except DOS 4.0/COMPAQ DOS 3.31 >32M partn) AL = drive number (0=A, 1=B, etc) DS:BX = Disk Transfer Address (buffer) CX = number of sectors to write DX = first relative sector to write Return: CF set on error AL = error code issued to INT 24h in low half of DI AH = same error codes as for INT 25h Note: ORIGINAL FLAGS ON STACK! BUG: DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an invalid drive number --------------------------------------------- INT 26 - DOS 4.0/COMPAQ DOS 3.31 - ABSOLUTE DISK WRITE (>32M hard-disk partitn) AL = drive number (0=A, 1=B, etc) CX = FFFFh DS:BX -> disk write packet (see below) Return: same as above??? Note: partition is potentially >32M (and requires this form of the call) if bit 1 of device attribute word in device driver is set Format of disk write packet: Offset Size Description 00h DWORD sector number 04h WORD number of sectors to read 06h DWORD transfer address --------------------------------------------- INT 27 - DOS - TERMINATE BUT STAY RESIDENT CS = current program segment DX = last program byte + 1 Return: never ---------------------------------------------