http://osfree.su/doku/ 2026-04-04T06:09:11+00:00 http://osfree.su/doku/ http://osfree.su/doku/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2021-08-06T07:49:37+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int2e&rev=1628236177&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 2EH Version 2 and higher Brief PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION Family API Input DS:SI -> commandline to execute (see #02585) Return all registers except CS:IP destroyed AX = status (4DOS v4.0) 0000h successful FFFFh error before processing command (not enough memory, etc) other error number returned by command text/html 2024-04-07T15:01:56+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int2f&rev=1712502116&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. INT 2FH AH Description 06H ASSIGN 4AH Task list 4BH Task switcher 16H DPMI 43H XMS B0H GRAFTABL B7H APPEND DOS API Process manager INT 20H, INT 21H: 00H, 25H, 26H, 31H, 34H, 35H, 4BH, 4CH, 4DH, 50H, 51H, 52H, 55H, 62H, text/html 2020-12-08T05:47:35+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int20&rev=1607406455&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 20H Version 1 and higher Brief TERMINATE PROGRAM Family API DosExit Input CS = PSP segment Return Never return Macro INCLUDE DOS.INC TERMINATE Notes Function is obsolete. Use text/html 2026-03-05T05:24:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21&rev=1772688260&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. INT 21H Version 1 and higher Brief DOS API Dispatcher Family API Family API functions Win16 API Dos3Call, NoHookDosCall Input AH Description Version Implemented in DOSKRNL osFree MacroLib API text/html 2026-03-16T03:12:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int22&rev=1773630730&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. PROGRAM TERMINATION ADDRESS Desc This vector specifies the address of the routine which is to be given control after a program is terminated; it should never be called directly, since it does not point at an interrupt handler text/html 2021-08-06T07:19:36+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int23&rev=1628234376&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 23H Version 1 and higher Brief CONTROL-C/CONTROL-BREAK HANDLER Family API Input none Return * --DOS 1.x--- AH = 00h abort program if all registers preserved, restart DOS call ---DOS 2+--- CF clear all registers preserved return via RETF with CF set or (MS-DOS 1,DR DOS) RETF 2 with CF set DOS will abort program with errorlevel 0 else (RETF/RETF 2 with CF clear or IRET with CF ignored) … text/html 2021-08-06T07:22:19+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int24&rev=1628234539&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 24H Version 1 and higher Brief CRITICAL ERROR HANDLER Family API Input none Return none Macro Notes invoked when a critical (usually hardware) error is encountered by DOS (see #02543); should never be called directly when DOS terminates a program, it copies the previous value of the INT 24 vector out of the PSP (see #01378) and into the interrupt vector table text/html 2024-05-19T10:14:14+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int25&rev=1716113654&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 25H Version 1 and higher Brief Absolute disk read Family API Input * AL = drive number (00h = A:, 01h = B:, etc) * CX = number of sectors to read (not FFFFh) text/html 2021-08-06T07:39:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int26&rev=1628235582&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 26H Version 1 and higher Brief ABSOLUTE DISK WRITE (except partitions > 32M) Family API Input AL = drive number (00h = A:, 01h = B:, etc) CX = number of sectors to write (not FFFFh) DX = starting logical sector number (0000h - highest sector on drive) DS:BX -> data to write text/html 2021-08-06T07:42:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int27&rev=1628235723&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 27H Version 1 and higher Brief TERMINATE AND STAY RESIDENT Family API Input DX = number of bytes to keep resident (max FFF0h) CS = segment of PSP Return never text/html 2021-12-22T12:35:56+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int28&rev=1640176556&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 28H Version 2 and higher Brief DOS IDLE INTERRUPT Family API Input SS:SP = top of MS-DOS stack for I/O functions Return all registers preserved Macro Notes text/html 2021-08-30T10:35:16+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:docs:dos:api:int29&rev=1630319716&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 29H Version 2 and higher Brief FAST CONSOLE OUTPUT Family API VioWrtTty Input * AL = character to display Return * nothing Macro Notes BX may be destroyed by some versions of DOS 3.3