osFree wiki - en:docs:dos:api:int21:44 http://osfree.su/doku/ 2026-04-10T09:22:10+00:00 osFree wiki http://osfree.su/doku/ http://osfree.su/doku/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2024-05-03T01:19:30+00:00 Anonymous (anonymous@undisclosed.example.com) 00 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:00&rev=1714699170&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=00H Version 2 and higher Brief GET DEVICE INFORMATION Family API Input AX = 4400h BX = handle Return CF clear if successful DX = device information word (see #01423) AX destroyed CF set on error AX = error code (01h,05h,06h) (see #01680 at AH=59h/BX=0000h) text/html 2024-05-03T01:47:01+00:00 Anonymous (anonymous@undisclosed.example.com) 0a http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:0a&rev=1714700821&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=0AH Version 3.1 and higher Brief CHECK IF HANDLE IS REMOTE Family API Input AX = 440Ah BX = handle Return CF clear if successful DX = attribute word (as stored in SFT) bit 15: set if remote bit 14: date/time not set on close CF set on error AX = error code (01h,06h) (see #01680 at AH=59h/BX=0000h) text/html 2024-05-03T01:47:42+00:00 Anonymous (anonymous@undisclosed.example.com) 0b http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:0b&rev=1714700862&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=0BH Version 3.1 and higher Brief SET SHARING RETRY COUNT Family API Input AX = 440Bh CX = pause between retries (default 1) DX = number of retries (default 3) text/html 2024-05-03T01:48:50+00:00 Anonymous (anonymous@undisclosed.example.com) 0c http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:0c&rev=1714700930&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=0CH Version 3.2 and higher Brief GENERIC CHARACTER DEVICE REQUEST Family API Input AX = 440Ch BX = device handle CH = category code (see #01545) CL = function number (see #01546) DS:DX -> parameter block (see #01547,#01548,#01549,#01550,#01551,#01552) SI = parameter to pass to driver (European MS-DOS 4.0, OS/2 comp box) DI = parameter to pass to driver (European MS-DOS 4.0, OS/2 … text/html 2024-05-03T01:51:15+00:00 Anonymous (anonymous@undisclosed.example.com) 0d http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:0d&rev=1714701075&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=0DH Version 3.2 and higher Brief GENERIC BLOCK DEVICE REQUEST Family API Input AX = 440Dh BL = drive number (00h=default,01h=A:,etc) CH = category code (see #01558) CL = minor code (function) (see #01559) DS:DX -> (DOS) parameter block (see #01560,#01562,#01563,#01564,#01565) SI:DI -> (OS/2 comp box) parameter block (see #01566,#01568,#01569,#01572) text/html 2024-05-03T01:52:41+00:00 Anonymous (anonymous@undisclosed.example.com) 0e http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:0e&rev=1714701161&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=0EH Version 3.2 and higher Brief GET LOGICAL DRIVE MAP Family API Input AX = 440Eh BL = drive number (00h=default,01h=A:,etc) Return CF set on error text/html 2024-05-03T01:53:18+00:00 Anonymous (anonymous@undisclosed.example.com) 0f http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:0f&rev=1714701198&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=0FH Version 3.2 and higher Brief SET LOGICAL DRIVE MAP Family API Input AX = 440Fh BL = physical drive number (00h=default,01h=A:,etc)) Return text/html 2024-05-03T01:30:43+00:00 Anonymous (anonymous@undisclosed.example.com) 01 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:01&rev=1714699843&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=01H Version 2 and higher Brief SET DEVICE INFORMATION Family API Input AX = 4401h BX = handle (must refer to character device) DX = device information word (see #01423) (DH must be zero for DOS version prior to 6.x) text/html 2024-05-03T01:31:35+00:00 Anonymous (anonymous@undisclosed.example.com) 02 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:02&rev=1714699895&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=02H Version 2 and higher Brief READ FROM CHARACTER DEVICE CONTROL CHANNEL Family API Input AX = 4402h BX = file handle referencing character device CX = number of bytes to read DS:DX -> buffer text/html 2024-05-03T01:40:01+00:00 Anonymous (anonymous@undisclosed.example.com) 03 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:03&rev=1714700401&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=03H Version 2 and higher Brief WRITE TO CHARACTER DEVICE CONTROL CHANNEL Family API Input AX = 4403h BX = file handle referencing character device CX = number of bytes to write DS:DX -> data to write text/html 2024-05-03T01:40:52+00:00 Anonymous (anonymous@undisclosed.example.com) 04 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:04&rev=1714700452&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=04H Version 2 and higher Brief READ FROM BLOCK DEVICE CONTROL CHANNEL Family API Input AX = 4404h BL = drive number (00h = default, 01h = A:, etc.) CX = number of bytes to read DS:DX -> buffer text/html 2024-05-03T01:41:26+00:00 Anonymous (anonymous@undisclosed.example.com) 05 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:05&rev=1714700486&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=05H Version 2 and higher Brief WRITE TO BLOCK DEVICE CONTROL CHANNEL Family API Input AX = 4405h BL = drive number (00h = default, 01h = A:, etc) CX = number of bytes to write DS:DX -> data to write text/html 2024-05-03T01:42:25+00:00 Anonymous (anonymous@undisclosed.example.com) 06 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:06&rev=1714700545&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=06H Version 2 and higher Brief GET INPUT STATUS Family API Input AX = 4406h BX = file handle Return CF clear if successful AL = input status 00h not ready (device) or at EOF (file) FFh ready AH may be destroyed (refer to note) CF set on error AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h) text/html 2024-05-03T01:43:00+00:00 Anonymous (anonymous@undisclosed.example.com) 07 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:07&rev=1714700580&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=07H Version 2 and higher Brief GET OUTPUT STATUS Family API Input AX = 4407h BX = file handle Return CF clear if successful AL = input status 00h not ready FFh ready CF set on error AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h) text/html 2024-05-03T01:44:21+00:00 Anonymous (anonymous@undisclosed.example.com) 08 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:08&rev=1714700661&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=08H Version 3.0 and higher Brief CHECK IF BLOCK DEVICE REMOVABLE Family API Input AX = 4408h BL = drive number (00h = default, 01h = A:, etc) text/html 2024-05-03T01:45:40+00:00 Anonymous (anonymous@undisclosed.example.com) 09 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:09&rev=1714700740&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=09H Version 3.1 and higher Brief CHECK IF BLOCK DEVICE REMOTE Family API Input AX = 4409h BL = drive number (00h = default, 01h = A:, etc) Return text/html 2024-05-03T01:54:13+00:00 Anonymous (anonymous@undisclosed.example.com) 10 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:10&rev=1714701253&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=10H Version 5 and higher Brief QUERY GENERIC IOCTL CAPABILITY (HANDLE) Family API Input AX = 4410h BX = handle for device CH = category code (see #01545) CL = function code (see #01546) text/html 2024-05-03T01:54:59+00:00 Anonymous (anonymous@undisclosed.example.com) 11 http://osfree.su/doku/doku.php?id=en:docs:dos:api:int21:44:11&rev=1714701299&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=44H, AL=11H Version 5 and higher Brief QUERY GENERIC IOCTL CAPABILITY (DRIVE) Family API Input AX = 4411h BL = drive number CH = category code (see #01558) CL = function code (see #01559)