2100 - DOS 1+ - TERMINATE PROGRAM
 2101 - DOS 1+ - READ CHARACTER FROM STANDARD INPUT, WITH ECHO
 2102 - DOS 1+ - WRITE CHARACTER TO STANDARD OUTPUT
 2103 - DOS 1+ - READ CHARACTER FROM STDAUX
 2104 - DOS 1+ - WRITE CHARACTER TO STDAUX
 2105 - DOS 1+ - WRITE CHARACTER TO PRINTER
 2106 - DOS 1+ - DIRECT CONSOLE OUTPUT
 2106 - DOS 1+ - DIRECT CONSOLE INPUT
 2107 - DOS 1+ - DIRECT CHARACTER INPUT, WITHOUT ECHO
 2108 - DOS 1+ - CHARACTER INPUT WITHOUT ECHO
 2109 - DOS 1+ - WRITE STRING TO STANDARD OUTPUT
 210A - DOS 1+ - BUFFERED INPUT
 210A00 - WCED v1.6 - INSTALLATION CHECK
 210B - DOS 1+ - GET STDIN STATUS
 210B56 - VIRUS - "Perfume" - INSTALLATION CHECK
 210C - DOS 1+ - FLUSH BUFFER AND READ STANDARD INPUT
 210D - DOS 1+ - DISK RESET
 210D20 - VIRUS - "Crazy Imp" - INSTALLATION CHECK
 210E - DOS 1+ - SELECT DEFAULT DRIVE
 210F - DOS 1+ - OPEN FILE USING FCB
 2110 - DOS 1+ - CLOSE FILE USING FCB
 2111 - DOS 1+ - FIND FIRST MATCHING FILE USING FCB
 2112 - DOS 1+ - FIND NEXT MATCHING FILE USING FCB
 2113 - DOS 1+ - DELETE FILE USING FCB
 2114 - DOS 1+ - SEQUENTIAL READ FROM FCB FILE
 2115 - DOS 1+ - SEQUENTIAL WRITE TO FCB FILE
 2116 - DOS 1+ - CREATE OR TRUNCATE FILE USING FCB
 2117 - DOS 1+ - RENAME FILE USING FCB
 2118 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
 2119 - DOS 1+ - GET CURRENT DEFAULT DRIVE
 211A - DOS 1+ - SET DISK TRANSFER AREA ADDRESS
 211B - DOS 1+ - GET ALLOCATION INFORMATION FOR DEFAULT DRIVE
 211C - DOS 1+ - GET ALLOCATION INFORMATION FOR SPECIFIC DRIVE
 211D - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
 211E - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
 211F - DOS 1+ - GET DRIVE PARAMETER BLOCK FOR DEFAULT DRIVE
 2120 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
 2121 - DOS 1+ - READ RANDOM RECORD FROM FCB FILE
 2122 - DOS 1+ - WRITE RANDOM RECORD TO FCB FILE
 2123 - DOS 1+ - GET FILE SIZE FOR FCB
 2124 - DOS 1+ - SET RANDOM RECORD NUMBER FOR FCB
 2125 - DOS 1+ - SET INTERRUPT VECTOR
 212501 - Phar Lap 386/DOS-Extender - RESET DOS EXTENDER DATA STRUCTURES
 212502 - Phar Lap 386/DOS-Extender - GET PROTECTED-MODE INTERRUPT VECTOR
 212503 - Phar Lap 386/DOS-Extender - GET REAL-MODE INTERRUPT VECTOR
 212504 - Phar Lap 386/DOS-Extender - SET PROTECTED-MODE INTERRUPT VECTOR
 212505 - Phar Lap 386/DOS-Extender - SET REAL-MODE INTERRUPT VECTOR
 212506 - Phar Lap 386/DOS-Extender - SET INT TO ALWAYS GAIN CONTRL IN PROT MODE
 212507 - Phar Lap 386/DOS-Extender - SET REAL- & PROTECTED-MODE INT VECTORS
 212508 - Phar Lap 386/DOS-Extender - GET SEGMENT LINEAR BASE ADDRESS
 212509 - Phar Lap 386/DOS-Extender - CONVERT LINEAR TO PHYSICAL ADDRESS
 212509 - FlashTek X-32VM - GET SYSTEM SEGMENTS AND SELECTORS
 21250A - Phar Lap 386/DOS-Extender - MAP PHYSICAL MEMORY AT END OF SEGMENT
 21250C - Phar Lap 386/DOS-Extender - GET HARDWARE INTERRUPT VECTORS
 21250D - Phar Lap 386/DOS-Extender - GET REAL-MODE LINK INFORMATION
 21250E - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE
 21250F - Phar Lap 386/DOS-Extender - CONVERT PROTECTED-MODE ADDRESS TO MS-DOS
 212510 - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE, REGISTERS
 212511 - Phar Lap 386/DOS-Extender - ISSUE REAL-MODE INTERRUPT
 212512 - Phar Lap 386/DOS-Extender - LOAD PROGRAM FOR DEBUGGING
 212513 - Phar Lap 386/DOS-Extender - ALIAS SEGMENT DESCRIPTOR
 212514 - Phar Lap 386/DOS-Extender - CHANGE SEGMENT ATTRIBUTES
 212515 - Phar Lap 386/DOS-Extender - GET SEGMENT ATTRIBUTES
 212516 - Phar Lap 386/DOS-Extender - FREE ALL MEMORY OWNED BY LDT
 212517 - Phar Lap 386/DOS-Extender - GET INFO ON DOS DATA BUFFER
 212518 - Phar Lap 386/DOS-Extender - SPECIFY HANDLER FOR MOVED SEGMENTS
 212519 - Phar Lap 386/DOS-Extender VMM - GET ADDITIONAL MEMORY ERROR INFO
 21251A - Phar Lap 386/DOS-Extender VMM - LOCK PAGES IN MEMORY
 21251B - Phar Lap 386/DOS-Extender VMM - UNLOCK PAGES
 21251D - Phar Lap 386/DOS-Extender VMM - READ PAGE-TABLE ENTRY
 21251E - Phar Lap 386/DOS-Extender VMM - WRITE PAGE-TABLE ENTRY
 21251F - Phar Lap 386/DOS-Extender VMM - EXHANGE TWO PAGE-TABLE ENTRIES
 212520 - Phar Lap 386/DOS-Extender VMM - GET MEMORY STATISTICS
 212521 - Phar Lap 386/DOS-Extender VMM - LIMIT PROGRAM'S EXTENDED MEMORY USAGE
 212522 - Phar Lap 386/DOS-Extender VMM - SPECIFY ALTERNATE PAGE-FAULT HANDLER
 212523 - Phar Lap 386/DOS-Extender VMM - SPECIFY OUT-OF-SWAP-SPACE HANDLER
 212524 - Phar Lap 386/DOS-Extender VMM - INSTALL PAGE-REPLACEMENT HANDLERS
 212525 - Phar Lap 386/DOS-Extender VMM - LIMIT PROGRAM'S CONVENTIONAL MEM USAGE
 212526 - Phar Lap 386/DOS-Extender - GET CONFIGURATION INFORMATION
 21252B - FlashTek X-32VM - VIRTUAL MEMORY MANAGEMENT - PAGE LOCKING
 212532 - FlashTek X-32VM - GET EXCEPTION HANDLER VECTOR
 212533 - FlashTek X-32VM - SET EXCEPTION HANDLER VECTOR
 2125C0 - Phar Lap 386/DOS-Extender - ALLOCATE MS-DOS MEMORY BLOCK
 2125C1 - Phar Lap 386/DOS-Extender - RELEASE MS-DOS MEMORY BLOCK
 2125C2 - Phar Lap 386/DOS-Extender - MODIFY MS-DOS MEMORY BLOCK
 2125C3 - Phar Lap 386/DOS-Extender - EXECUTE PROGRAM
 2126 - DOS 1+ - CREATE NEW PROGRAM SEGMENT PREFIX
 2127 - DOS 1+ - RANDOM BLOCK READ FROM FCB FILE
 2128 - DOS 1+ - RANDOM BLOCK WRITE TO FCB FILE
 2129 - DOS 1+ - PARSE FILENAME INTO FCB
 212A - DOS 1+ - GET SYSTEM DATE
 212B - DOS 1+ - SET SYSTEM DATE
 212B - AI Architects - ??? - INSTALLATION CHECK
 212B - PC Tools v5.x PC-Cache - INSTALLATION CHECK
 212B - DESQview - INSTALLATION CHECK
 212B - ELRES v1.1 - INSTALLATION CHECK
 212B01CX5441 - TAME v2.10+ - INSTALLATION CHECK
 212B44BX4D41 - pcANYWHERE IV/LAN - INSTALLATION CHECK
 212C - DOS 1+ - GET SYSTEM TIME
 212D - DOS 1+ - SET SYSTEM TIME
 212E - DOS 1+ - SET VERIFY FLAG
 212F - DOS 2+ - GET DISK TRANSFER AREA ADDRESS
 2130 - DOS 2+ - GET DOS VERSION
 2130 - Phar Lap 386/DOS-Extender, Intel Code Builder - INSTALLATION CHECK
 2130 - VIRUS - "Possessed" - INSTALLATION CHECK
 213000 - Btrieve Multi-User - INSTALLATION CHECK
 213000BX1234 - CTask 2.0+ - INSTALLATION CHECK
 213000BX3000 - PC-MOS/386 v3.0 - INSTALLATION CHECK/GET VERSION
 2130F1 - VIRUS - "Dutch-555"/"Quit 1992" - INSTALLATION CHECK
 2131 - DOS 2+ - TERMINATE AND STAY RESIDENT
 2132 - DOS 2+ - GET DOS DRIVE PARAMETER BLOCK FOR SPECIFIC DRIVE
 2133 - DOS 2+ - EXTENDED BREAK CHECKING
 213302 - DOS 3.x+ internal - GET AND SET EXTENDED CONTROL-BREAK CHECKING STATE
 213305 - DOS 4+ - GET BOOT DRIVE
 213306 - DOS 5.0 - GET TRUE VERSION NUMBER
 213306 - CBIS POWERLAN - NETWORK REDIRECTOR - ???
 21330F - VIRUS - "Burghofer" - INSTALLATION CHECK
 2133E0 - VIRUS - "Oropax" - INSTALLATION CHECK
 2134 - DOS 2+ - GET ADDRESS OF INDOS FLAG
 2135 - DOS 2+ - GET INTERRUPT VECTOR
 213501 - FlashTek X-32VM - ALLOCATE PROTECTED-MODE SELECTOR
 213502 - FlashTek X-32VM - DEALLOCATE PROTECTED-MODE SELECTOR
 213503 - FlashTek X-32VM - SET SELECTOR BASE ADDRESS
 21357F - VIRUS - "Agiplan"/"Month 4-6" - INSTALLATION CHECK
 2136 - DOS 2+ - GET FREE DISK SPACE
 213700 - DOS 2+ - "SWITCHAR" - GET SWITCH CHARACTER
 213701 - DOS 2+ - "SWITCHAR" - SET SWITCH CHARACTER
 2137 - DOS 2.x and 3.3+ only - "AVAILDEV" - SPECIFY \DEV\ PREFIX USE
 2138 - DOS 2+ - GET COUNTRY-SPECIFIC INFORMATION
 2138 - DOS 3+ - SET COUNTRY CODE
 2139 - DOS 2+ - "MKDIR" - CREATE SUBDIRECTORY
 213A - DOS 2+ - "RMDIR" - REMOVE SUBDIRECTORY
 213B - DOS 2+ - "CHDIR" - SET CURRENT DIRECTORY
 213C - DOS 2+ - "CREAT" - CREATE OR TRUNCATE FILE
 213D - DOS 2+ - "OPEN" - OPEN EXISTING FILE
 213DFF - VIRUS - "JD-448" - INSTALLATION CHECK
 213E - DOS 2+ - "CLOSE" - CLOSE FILE
 213F - DOS 2+ - "READ" - READ FROM FILE OR DEVICE
 213F - Turbo Debug HARDWARE BREAKPOINTS - READ STATUS BLOCK
 213F - PC/TCP IPCUST.SYS - READ CONFIGURATION DATA
 2140 - DOS 2+ - "WRITE" - WRITE TO FILE OR DEVICE
 2140 - Turbo Debug HARDWARE BREAKPOINTS - SEND CMD TO HARDWARE BRKPNT DRIVER
 2140 - PC/TCP IPCUST.SYS - WRITE CONFIGURATION DATA
 214000BX0002 - FARTBELL.EXE - INSTALLATION CHECK
 214001BX0002 - FARTBELL.EXE - FORCE NOISE
 2141 - DOS 2+ - "UNLINK" - DELETE FILE
 214101DXFFFE - SoftLogic Data Guardian - ???
 2142 - DOS 2+ - "LSEEK" - SET CURRENT FILE POSITION
 214203 - VIRUS - "Shake" - INSTALLATION CHECK
 214243 - VIRUS - "Invader" - INSTALLATION CHECK
 214300 - DOS 2+ - GET FILE ATTRIBUTES
 214301 - DOS 2+ - "CHMOD" - SET FILE ATTRIBUTES
 214302 - DR-DOS 3.41+ internal - GET ACCESS RIGHTS
 214303 - DR-DOS 3.41+ internal - SET ACCESS RIGHTS AND PASSWORD
 214304 - DR-DOS 5.0 internal - GET ???
 214305 - DR-DOS 5.0 internal - SET ???
 214310 - Banyan VINES 2.1+ - GET EXTENDED FILE ATTRIBUTES
 214310 - Banyan VINES 2.1+ - SET EXTENDED FILE ATTRIBUTES
 214400 - DOS 2+ - IOCTL - GET DEVICE INFORMATION
 214401 - DOS 2+ - IOCTL - SET DEVICE INFORMATION
 214402 - DOS 2+ - IOCTL - READ FROM CHARACTER DEVICE CONTROL CHANNEL
 214402 - Network Driver Interface Spec 2.0.1 - PROTOCOL MANAGER
 214402 - IBM SYSTEM 36/38 WORKSTATION EMULATION - VDI.SYS - GET ???
 214402 - LASTBYTE.SYS v1.19 - IOCTL - GET ??? TABLE
 214402 - HIGHUMM.SYS v1.17+ - IOCTL - GET API ADDRESS
 214402 - SMARTDRV.SYS - IOCTL - GET CACHE STATUS
 214402 - CD-ROM device driver - IOCTL INPUT
 214402 - Quarterdeck - QEMM-386 v5+ - GET API ENTRY POINT
 214402 - Quarterdeck - QEMM-386 v6+ - GET ???
 214402 - Quarterdeck - HOOKROM.SYS - GET HOOKED VECTOR TABLE
 214402 - Advanced SCSI Programming Interface (ASPI) - INTERFACE
 214402 - Qualitas 386MAX v6.00+ - IOCTL INPUT - GET STATE
 214402 - PGS1600.DEV - IOCTL - GET CONFIGURATION INFO
 214402 - PC/TCP IPCUST.SYS - RESET CONFIGURATION DATA READ POINTER
 214403 - DOS 2+ - IOCTL - WRITE TO CHARACTER DEVICE CONTROL CHANNEL
 214403 - SMARTDRV.SYS - IOCTL - CACHE CONTROL
 214403 - CD-ROM device driver - IOCTL OUTPUT
 214403 - Brian Antoine Seagate ST-01 SCSI.SYS - IOCTL - EXECUTE COMMANDS
 214403 - AI Architects - OS/x86??? - API
 214403 - Qualitas 386MAX v6.01 - SET STATE
 214403 - PGS1600.DEV - IOCTL - SET CONFIGURATION???
 214403 - PC/TCP IPCUST.SYS - RESET CONFIGURATION DATA READ POINTER
 214404 - DOS 2+ - IOCTL - READ FROM BLOCK DEVICE CONTROL CHANNEL
 214404 - Stacker - GET DEVICE DRIVER ADDRESS AND SET VOLUME NUMBER
 214404 - Stacker - GET STACVOL FILE SECTORS
 214405 - DOS 2+ - IOCTL - WRITE TO BLOCK DEVICE CONTROL CHANNEL
 214405 - Brian Antoine Seagate ST-01 SCSI.SYS - IOCTL - EXECUTE COMMANDS
 214406 - DOS 2+ - IOCTL - GET INPUT STATUS
 214407 - DOS 2+ - IOCTL - GET OUTPUT STATUS
 214408 - DOS 3.0+ - IOCTL - CHECK IF BLOCK DEVICE REMOVABLE
 214409 - DOS 3.1+ - IOCTL - CHECK IF BLOCK DEVICE REMOTE
 21440A - DOS 3.1+ - IOCTL - CHECK IF HANDLE IS REMOTE
 21440B - DOS 3.1+ - IOCTL - SET SHARING RETRY COUNT
 21440C - DOS 3.2+ - IOCTL - GENERIC CHARACTER DEVICE REQUEST
 21440C - Greg Shenaut ASPITAPE.SYS - INTERFACE
 21440D - DOS 3.2+ - IOCTL - GENERIC BLOCK DEVICE REQUEST
 21440E - DOS 3.2+ - IOCTL - GET LOGICAL DRIVE MAP
 21440F - DOS 3.2+ - IOCTL - SET LOGICAL DRIVE MAP
 214410 - DOS 5.0 - IOCTL - QUERY GENERIC IOCTL CAPABILITY (HANDLE)
 214410BXFFFF - NewSpace - ENABLE DRIVER
 214411 - DOS 5.0 - IOCTL - QUERY GENERIC IOCTL CAPABILITY (DRIVE)
 214411BXFFFF - NewSpace - DISABLE DRIVER
 214412 - DR-DOS 5+ - DETERMINE DOS TYPE
 214412BXFFFF - NewSpace - INSTALLATION CHECK???
 214413BXFFFF - NewSpace - GET ???
 214414 - DR-DOS 5.0 - SET GLOBAL PASSWORD
 214414BXFFFF - NewSpace - DEBUGGING DUMP
 2144 - DR-DOS 5.0 - HISTORY BUFFER, SHARE, AND HILOAD CONTROL
 214451 - Concurrent DOS v3.2+ - INSTALLATION CHECK
 214452 - DR-DOS 3.41+ - DETERMINE DOS TYPE/GET DR-DOS VERSION
 214454 - DR-DOS 3.41+ - SET GLOBAL PASSWORD
 214456 - DR-DOS 5.0+ - HISTORY BUFFER CONTROL
 214457 - DR-DOS 5.0+ - SHARE/HILOAD CONTROL
 214457DXFFFF - DR-DOS 6.0 - GET SHARE STATUS
 214458 - DR-DOS 5.0+ internal - GET POINTER TO TABLE OF ???
 214459 - DR MultiUser DOS 5.0 - API
 2144FFBXFFFF - NewSpace - ???