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INT 21 - DOS - PROGRAM TERMINATION
INT 21 - DOS - KEYBOARD INPUT
INT 21 - DOS - DISPLAY OUTPUT
INT 21 - DOS - AUX INPUT
INT 21 - DOS - AUX OUTPUT
INT 21 - DOS - PRINTER OUTPUT
INT 21 - DOS - DIRECT CONSOLE I/O CHARACTER OUTPUT
INT 21 - DOS - DIRECT CONSOLE I/O CHARACTER INPUT
INT 21 - DOS - DIRECT STDIN INPUT, NO ECHO
INT 21 - DOS - KEYBOARD INPUT, NO ECHO
INT 21 - DOS - PRINT STRING
INT 21 - DOS - BUFFERED KEYBOARD INPUT
INT 21 - DOS - CHECK STANDARD INPUT STATUS
INT 21 - DOS - CLEAR KEYBOARD BUFFER
INT 21 - DOS - DISK RESET
INT 21 - DOS - SELECT DISK
INT 21 - DOS - OPEN DISK FILE
INT 21 - DOS - CLOSE DISK FILE
INT 21 - DOS - SEARCH FIRST USING FCB
INT 21 - DOS - SEARCH NEXT USING FCB
INT 21 - DOS - DELETE FILE via FCB
INT 21 - DOS - SEQUENTIAL DISK FILE READ
INT 21 - DOS - SEQUENTIAL DISK RECORD WRITE
INT 21 - DOS - CREATE A DISK FILE
INT 21 - DOS - RENAME FILE via FCB
INT 21 - DOS internal - UNUSED
INT 21 - DOS - GET DEFAULT DISK NUMBER
INT 21 - DOS - SET DISK TRANSFER AREA ADDRESS
INT 21 - DOS - GET ALLOCATION TABLE INFORMATION FOR DEFAULT DRIVE
INT 21 - DOS - GET ALLOCATION TABLE INFORMATION FOR SPECIFIC DRIVE
INT 21 - DOS internal - UNUSED
INT 21 - DOS internal - UNUSED
INT 21 - DOS internal - GET DEFAULT DRIVE PARAMETER BLOCK
INT 21 - DOS internal - UNUSED
INT 21 - DOS - RANDOM DISK RECORD READ
INT 21 - DOS - RANDOM DISK RECORD WRITE
INT 21 - DOS - GET FILE SIZE
INT 21 - DOS - SET RANDOM RECORD FIELD
INT 21 - DOS - SET INTERRUPT VECTOR
INT 21 - Phar Lap 386/DOS-Extender - RESET 386/DOS-EXTENDER DATA STRUCTURES
INT 21 - Phar Lap 386/DOS-Extender - GET PROTECTED-MODE INTERRUPT VECTOR
INT 21 - Phar Lap 386/DOS-Extender - GET REAL-MODE INTERRUPT VECTOR
INT 21 - Phar Lap 386/DOS-Extender - SET PROTECTED-MODE INTERRUPT VECTOR
INT 21 - Phar Lap 386/DOS-Extender - SET REAL-MODE INTERRUPT VECTOR
INT 21 - Phar Lap 386/DOS-Extender - SET INT TO ALWAYS GAIN CONTRL IN PROT MODE
INT 21 - Phar Lap 386/DOS-Extender - SET REAL- & PROTECTED-MODE INT VECTORS
INT 21 - Phar Lap 386/DOS-Extender - GET SEGMENT LINEAR BASE ADDRESS
INT 21 - Phar Lap 386/DOS-Extender - CONVERT LINEAR TO PHYSICAL ADDRESS
INT 21 - Phar Lap 386/DOS-Extender - MAP PHYSICAL MEMORY AT END OF SEGMENT
INT 21 - Phar Lap 386/DOS-Extender - GET HARDWARE INTERRUPT VECTORS
INT 21 - Phar Lap 386/DOS-Extender - GET REAL-MODE LINK INFORMATION
INT 21 - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE
INT 21 - Phar Lap 386/DOS-Extender - CONVERT PROTECTED-MODE ADDRESS TO MS-DOS
INT 21 - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE, REGISTERS
INT 21 - Phar Lap 386/DOS-Extender - ISSUE REAL-MODE INTERRUPT
INT 21 - Phar Lap 386/DOS-Extender - LOAD PROGRAM FOR DEBUGGING
INT 21 - Phar Lap 386/DOS-Extender - ALIAS SEGMENT DESCRIPTOR
INT 21 - Phar Lap 386/DOS-Extender - CHANGE SEGMENT ATTRIBUTES
INT 21 - Phar Lap 386/DOS-Extender - GET SEGMENT ATTRIBUTES
INT 21 - Phar Lap 386/DOS-Extender - FREE ALL MEMORY OWNED BY LDT
INT 21 - Phar Lap 386/DOS-Extender - GET INFO ON DOS DATA BUFFER
INT 21 - Phar Lap 386/DOS-Extender - SPECIFY HANDLER FOR MOVED SEGMENTS
INT 21 - Phar Lap 386/DOS-Extender VMM - GET ADDITIONAL MEMORY ERROR INFO
INT 21 - Phar Lap 386/DOS-Extender VMM - LOCK PAGES IN MEMORY
INT 21 - Phar Lap 386/DOS-Extender VMM - UNLOCK PAGES
INT 21 - Phar Lap 386/DOS-Extender VMM - READ PAGE-TABLE ENTRY
INT 21 - Phar Lap 386/DOS-Extender VMM - WRITE PAGE-TABLE ENTRY
INT 21 - Phar Lap 386/DOS-Extender VMM - EXHANGE TWO PAGE-TABLE ENTRIES
INT 21 - Phar Lap 386/DOS-Extender VMM - GET MEMORY STATISTICS
INT 21 - Phar Lap 386/DOS-Extender VMM - LIMIT PROGRAM'S EXTENDED MEMORY USAGE
INT 21 - Phar Lap 386/DOS-Extender VMM - SPECIFY ALTERNATE PAGE-FAULT HANDLER
INT 21 - Phar Lap 386/DOS-Extender VMM - SPECIFY OUT-OF-SWAP-SPACE HANDLER
INT 21 - Phar Lap 386/DOS-Extender VMM - INSTALL PAGE-REPLACEMENT HANDLERS
INT 21 - Phar Lap 386/DOS-Extender VMM - LIMIT PROGRAM'S CONVENTIONAL MEM USAGE
INT 21 - Phar Lap 386/DOS-Extender - GET CONFIGURATION INFORMATION
INT 21 - Phar Lap 386/DOS-Extender - ALLOCATE MS-DOS MEMORY BLOCK
INT 21 - Phar Lap 386/DOS-Extender - RELEASE MS-DOS MEMORY BLOCK
INT 21 - Phar Lap 386/DOS-Extender - MODIFY MS-DOS MEMORY BLOCK
INT 21 - Phar Lap 386/DOS-Extender - EXECUTE PROGRAM
INT 21 - DOS - CREATE PSP
INT 21 - DOS - RANDOM BLOCK READ
INT 21 - DOS - RANDOM BLOCK WRITE
INT 21 - DOS - PARSE FILENAME
INT 21 - DOS - GET CURRENT DATE
INT 21 - DOS - SET CURRENT DATE
INT 21 - DESQview - INSTALLATION CHECK
INT 21 - PC Tools v5.1 PC-CACHE - INSTALLATION CHECK
INT 21 - TAME v2.10 - INSTALLATION CHECK
INT 21 - DOS - GET CURRENT TIME
INT 21 - DOS - SET CURRENT TIME
INT 21 - DOS - SET VERIFY FLAG
INT 21 - DOS 2+ - GET DISK TRANSFER AREA ADDRESS
INT 21 - DOS 2+ - GET DOS VERSION
INT 21 - Phar Lap 386/DOS-Extender - GET VERSION
INT 21 - CTask 2.0 - INSTALLATION CHECK
INT 21 - DOS 2+ - TERMINATE BUT STAY RESIDENT
INT 21 - DOS 2+ internal - GET DRIVE PARAMETER BLOCK
INT 21 - DOS 2+ - EXTENDED CONTROL-BREAK CHECKING
INT 21 - DOS 3.x internal - GET AND SET EXTENDED CONTROL-BREAK CHECKING STATE
INT 21 - DOS 4.0 - GET BOOT DRIVE
INT 21 - DOS 2+ internal - RETURN CritSectFlag (InDOS) POINTER
INT 21 - DOS 2+ - GET INTERRUPT VECTOR
INT 21 - DOS 2+ - GET DISK SPACE
INT 21 - DOS 2+ internal - GET SWITCHAR
INT 21 - DOS 2+ internal - SET SWITCHAR
INT 21 - DOS 2.x and 3.3+ internal - AVAILDEV
INT 21 - DOS 2+ - GET COUNTRY-DEPENDENT INFORMATION
INT 21 - DOS 3+ - SET COUNTRY CODE
INT 21 - DOS 2+ - CREATE A SUBDIRECTORY (MKDIR)
INT 21 - DOS 2+ - REMOVE A DIRECTORY ENTRY (RMDIR)
INT 21 - DOS 2+ - CHANGE THE CURRENT DIRECTORY (CHDIR)
INT 21 - DOS 2+ - CREATE A FILE WITH HANDLE (CREAT)
INT 21 - DOS 2+ - OPEN DISK FILE WITH HANDLE
INT 21 - DOS 2+ - CLOSE A FILE WITH HANDLE
INT 21 - DOS 2+ - READ FROM FILE WITH HANDLE
INT 21 - DOS 2+ - WRITE TO FILE WITH HANDLE
INT 21 - DOS 2+ - DELETE A FILE (UNLINK)
INT 21 - DOS 2+ - MOVE FILE READ/WRITE POINTER (LSEEK)
INT 21 - DOS 2+ - GET FILE ATTRIBUTES
INT 21 - DOS 2+ - PUT FILE ATTRIBUTES (CHMOD)
INT 21 - DOS 2+ - IOCTL - GET DEVICE INFORMATION
INT 21 - DOS 2+ - IOCTL - SET DEVICE INFORMATION
INT 21 - DOS 2+ - IOCTL - READ CHARACTER DEVICE CONTROL STRING
INT 21 - Network Driver Interface Spec 2.0.1 - PROTOCOL MANAGER
INT 21 - IBM SYSTEM 36/38 WORKSTATION EMULATION - VDI.SYS - GET ???
INT 21 - HIGHUMM.SYS - IOCTL - GET API ADDRESS
INT 21 - DOS 2+ - IOCTL - WRITE CHARACTER DEVICE CONTROL STRING
INT 21 - DOS 2+ - IOCTL - READ BLOCK DEVICE CONTROL STRING
INT 21 - DOS 2+ - IOCTL - WRITE BLOCK DEVICE CONTROL STRING
INT 21 - DOS 2+ - IOCTL - GET INPUT STATUS
INT 21 - DOS 2+ - IOCTL - GET OUTPUT STATUS
INT 21 - DOS 3+ - IOCTL - BLOCK DEVICE CHANGEABLE
INT 21 - DOS 3+ - IOCTL - BLOCK DEVICE LOCAL
INT 21 - DOS 3+ - IOCTL - HANDLE LOCAL
INT 21 - DOS 3+ - IOCTL - SET SHARING RETRY COUNT
INT 21 - DOS 3.2+ - IOCTL - GENERIC CHARACTER DEVICE REQUEST
INT 21 - DOS 3.2+ - IOCTL - GENERIC BLOCK DEVICE REQUEST
INT 21 - DOS 3.2+ - IOCTL - GET LOGICAL DRIVE MAP
INT 21 - DOS 3.2+ - IOCTL - SET LOGICAL DRIVE MAP
INT 21 - Concurrent DOS v3.2+ - INSTALLATION CHECK
INT 21 - DR DOS 3.41-5.0 - IOCTL - DETERMINE DOS TYPE
INT 21 - DOS 2+ - CREATE DUPLICATE HANDLE (DUP)
INT 21 - DOS 2+ - FORCE DUPLICATE HANDLE (FORCDUP,DUP2)
INT 21 - DOS 2+ - GET CURRENT DIRECTORY
INT 21 - DOS 2+ - ALLOCATE MEMORY
INT 21 - DOS 2+ - FREE MEMORY
INT 21 - DOS 2+ - ADJUST MEMORY BLOCK SIZE (SETBLOCK)
INT 21 - DOS 2+ - LOAD OR EXECUTE (EXEC)
INT 21 - DOS 2+ - QUIT WITH EXIT CODE (EXIT)
INT 21 - DOS 2+ - GET EXIT CODE OF SUBPROGRAM (WAIT)
INT 21 - DOS 2+ - FIND FIRST ASCIZ (FINDFIRST)
INT 21 - WILDUNIX.COM internal - INSTALLATION CHECK
INT 21 - DOS 2+ - FIND NEXT ASCIZ (FINDNEXT)
INT 21 - DOS 2+ internal - SET PSP SEGMENT
INT 21 - DOS 2+ internal - GET PSP SEGMENT