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INT 21h, 00h Program termination
INT 21h, 01h Keyboard input
INT 21h, 02h Display output
INT 21h, 03h Aux input
INT 21h, 04h Aux output
INT 21h, 05h Printer output
INT 21h, 06h Direct console I/O character
INT 21h, 07h Direct console input, no echo
INT 21h, 08h Stdin input, no echo
INT 21h, 09h Print string
INT 21h, 0Ah Buffered keyboard input
INT 21h, 0Bh Check standard input status
INT 21h, 0Ch Clear keyboard buffer
INT 21h, 0Dh Disk reset
INT 21h, 0Eh Select disk
INT 21h, 0Fh Open disk file
INT 21h, 10h Close disk file
INT 21h, 11h Search first using FCB
INT 21h, 12h Search next using FCB
INT 21h, 13h Delete file via FCB
INT 21h, 14h Sequential disk file read
INT 21h, 15h Sequential disk record write
INT 21h, 16h Create a disk file
INT 21h, 17h Rename file via FCB
INT 21, 18h DOS internal - UNUSED
INT 21h, 19h Get default disk number
INT 21h, 1Ah Set disk transfer area address
INT 21h, 1Bh Get allocation table information for default drive
INT 21h, 1Ch Get allocation table information for specific device
INT 21h, 1Dh Dos internal - Unused
INT 21h, 1Eh Dos internal - Unused
INT 21h, 1Fh Get default drive parameter block (Internal)
INT 21h, 21h Random disk record read
INT 21h, 22h Random disk record write
INT 21h, 23h Get file size
INT 21h, 24h Set random record field
INT 21h, 25h Set interrupt vector
INT 21h, 26h Create PSP
INT 21h, 27h Random block read
INT 21h, 28h Random block write
INT 21h, 29h Parse filename
INT 21h, 2Ah Get current date
INT 21h, 2Bh Set current date (+ DESQView inst. check)
INT 21h, 2Bh PC Tools v5.1 PC-CACHE - Installation check
INT 21h, 2Ch Get current time
INT 21h, 2Dh Set current time
INT 21h, 2Eh Set verify flag
INT 21h, 2Fh Get disk transfer area address
INT 21h, 30h Get dos version
INT 21h, 31h Terminate but stay resident
INT 21h, 32h Get DOS Drive Parameter Block (Internal)
INT 21h, 33h Extended control-break checking
INT 21h, 33h DOS 4.0 - Get boot drive
INT 21h, 34h In-DOS flag (Internal)
INT 21h, 35h Get interrupt vector
INT 21h, 36h Get disk space
INT 21h, 37h Switchar/availdev (Internal)
INT 21h, 38h Get/Set country-dependent information
INT 21h, 39h Create a subdirectory (MKDIR)
INT 21h, 3Ah Remove a directory entry (RMDIR)
INT 21h, 3Bh Change the current directory (CHDIR)
INT 21h, 3Ch Create a file with handle (CREAT)
INT 21h, 3Dh Open disk file with handle
INT 21h, 3Eh Close a file with handle
INT 21h, 3Fh Read from file with handle
INT 21h, 40h Write to file with handle
INT 21h, 41h Delete a file (UNLINK)
INT 21h, 42h Move file read/write pointer (LSEEK)
INT 21h, 43h Get/set file attributes (CHMOD)
INT 21h, 44h IOCTL
INT 21h, 45h Create duplicate handle (DUP)
INT 21h, 46h Force duplicate handle (FORCDUP)
INT 21h, 47h Get current directory
INT 21h, 48h Allocate memory
INT 21h, 49h Free memory
INT 21h, 4Ah Adjust memory block size (SETBLOCK)
INT 21h, 4Bh Load or execute (EXEC)
INT 21h, 4Ch Quit with exit code (EXIT)
INT 21h, 4Dh Get exit code of subprogram (WAIT)
INT 21h, 4Eh Find first ASCIIZ (FIND FIRST)
INT 21h, 4Fh Find next ASCIIZ (FIND NEXT)
INT 21h, 50h Set PSP segment (Internal)
INT 21h, 51h Get PSP segment (Internal)
INT 21h, 52h Get DOS lists (Internal)
INT 21h, 53h Translate BPB (Internal)
INT 21h, 54h Get verify flag
INT 21h, 55h Create PSP (Internal)
INT 21h, 56h Rename a file
INT 21h, 57h Get/set file's date/time
INT 21h, 58h Get/set memory allocation strategy (DOS 3.x - Internal)
INT 21h, 59h Get extended error code (DOS 3.x)
INT 21h, 5Ah Create temporary file (DOS 3.x)
INT 21h, 5Bh Create new file (DOS 3.x)
INT 21h, 5Ch Lock/unlock file access (DOS 3.x)
INT 21h, 5Dh DOS internal functions (DOS 3.x - Internal)
INT 21h, 5Eh Microsoft Networks
INT 21h, 60h Resolve path string to fully qualified path (DOS 3.x)
INT 21h, 62h Get PSP segment (DOS 3.x)
INT 21h, 65h Get extended country information (DOS 3.3)
INT 21h, 66h Get/set global code page table (DOS 3.3)
INT 21h, 67h Set handle count (DOS 3.3)
INT 21h, 68h Commit file, write all buffered data to disk (DOS 3.3)
INT 21h, 69h Get disk serial number (DOS 4.0 - Internal)
INT 21h, 6Ah Internal - ?? (DOS 4.x)
INT 21h, 6Bh Internal - ?? (DOS 4.x)
INT 21h, 6Ch Extended Open/Create (DOS 4.0)
INT 21h, Internal ??? (Called by Microsoft C 4.0 startup code)
INT 21h, B6h Extended file attributes (Novell II)
INT 21h, B8h Print jobs (Novell Adv. 2.0+)
INT 21h, BBh Set end of job status (Novell 4.0)
INT 21h, BCh Log physical record (Novell 4.6)
INT 21h, BDh Release physical record (Novell 4.6)
INT 21h, BEh Clear physical record (Novell 4.6)
INT 21h, BFh Log record (FCB) (Novell 4.6)
INT 21h, C0h Release record (FCB) (Novell 4.6)
INT 21h, C1h Clear record (FCB) (Novell 4.6)
INT 21h, C2h Lock physical record set (Novell 4.6)
INT 21h, C3h Release physical record set (Novell 4.6)
INT 21h, C4h Clear physical record set (Novell 4.6)
INT 21h, C5h Semaphores (Novell 4.6)
INT 21h, C6h Get or set lock mode (Novell 4.6)
INT 21h, C7h TTS (Novell 4.0)
INT 21h, C8h Begin logical file locking (Novell 4.0)
INT 21h, C9h End logical file locking (Novell 4.0)
INT 21h, CAh Log personal file (FCB) (Novell 4.0)
INT 21h, CBh Lock file set (Novell 4.0)
INT 21h, CCh Release file (FCB) (Novell 4.0)
INT 21h, CDh Release file set (Novell 4.0)
INT 21h, CEh Clear file (FCB) (Novell 4.0)
INT 21h, CFh Clear file set (Novell 4.0)
INT 21h, D0h Log logical record (Novell 4.6)
INT 21h, D1h Lock logical record set (Novell 4.6)
INT 21h, D2h Release logical record (Novell 4.0)
INT 21h, D3h Release logical record set (Novell 4.0)
INT 21h, D4h Clear logical record (Novell 4.0)
INT 21h, D5h Clear logical record set (Novell 4.0)
INT 21h, D6h End of job (Novell 4.0)
INT 21h, D7h System logout (Novell 4.0)
INT 21h, DAh Get volume statistics (Novell 4.0)
INT 21h, DBh Get number of local drives (Novell 4.0)
INT 21h, DCh Get station number (Novell 4.0)
INT 21h, DDh Set error mode (Novell 4.0)
INT 21h, DEh Set broadcast mode (Novell 4.0)
INT 21h, DFh Capture (Novell 4.0)
INT 21h, E0h Print spooling (Novell 4.0)
INT 21h, E1h Broadcast messages (Novell 4.0)
INT 21h, E2h Directory functions (Novell 4.0)
INT 21h, E3h Connection control (Novell 4.0)
INT 21h, E4h Set file attributes (FCB), (Novell 4.0)
INT 21h, E5h Update file size (FCB) (Novell 4.0)
INT 21h, E6h Copy file to file (FCB) (Novell 4.0)
INT 21h, E7h Get file server date and time (Novell 4.0)
INT 21h, E8h Set FCB re-open mode (Novell 4.6)
INT 21h, E9h Shell's "get base status" (Novell 4.6)
INT 21h, EAh Return shell version, (Novell 4.6.)
INT 21h, EBh Log file, (Novell 4.6.)
INT 21h, ECh Release file. (Novell 4.6)
INT 21h, EDh Clear file (Novell)
INT 21h, EEh Get physical station number (Novell 4.6)
INT 21h, EFh Get drive info (Novell Adv. 1.0+)
INT 21h, F0h Connection id (Novell Adv. 1.0+)
INT 21h, F1h File server connection (Novell Adv. 1.0+)
INT 21h, F2h Novell Netware - ???
INT 21h, F3h File server file copy (Novell Adv. 2.0+)
INT 21h, F3h File server file copy (Novell Adv. 2.0+)
INT 21h, E4h DoubleDos - INSTALLATION CHECK (INT 21h, E4h - DoubleDos)
INT 21h, EBh DoubleDos - Turn on task switching (INT 21h, EBh - DoubleDos)
INT 21h, ECh DoubleDos - Get virtual screen address (INT 21h, ECh - DoubleDos)
INT 21h, EEh DoubleDos - Give away time to other tasks (INT 21h, EEh - DoubleDos)
INT 21h, F8h Set oem int 21 handler
INT 21h, F9h OEM Function
INT 21h, FAh OEM Function
INT 21h, FBh OEM Function
INT 21h, FCh OEM Function
INT 21h, FDh OEM Function
INT 21h, FEh OEM Function
INT 21h, FFh OEM Function
INT 21h, FFh CED - Installable commands
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