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 00h (0)                 Terminate Program
 01h (1)                 Read Keyboard Character and Echo
 02h (2)                 Character Output
 03h (3)                 Auxiliary Character Input
 04h (4)                 Auxiliary Character Output
 05h (5)                 Printer Character Output
 06h (6)                 Direct Console Character I/O
 07h (7)                 Direct Console Character Input without Echo
 08h (8)                 Console Character Input without Echo
 09h (9)                 Print String
 0Ah (10)                Buffered Input
 0Bh (11)                Check Standard Input Status
 0Ch (12)                Clear Input Buffer, then Invoke Function
 0Dh (13)                Disk Reset
 0Eh (14)                Select Default Drive
 0Fh (15)                Open File, Using FCBs
 10h (16)                Close File, Using FCBs
 11h (17)                Search for First Matching File, Using FCBs
 12h (18)                Search for Next Matching File, Using FCBs
 13h (19)                Delete File, Using FCBs
 14h (20)                Sequential Read, Using FCBs
 15h (21)                Sequential Write, Using FCBs
 16h (22)                Create File, using FCBs
 17h (23)                Rename File, using FCBs
 18h (24)                Reserved
 19h (25)                Get Current Disk
 1Ah (26)                Set Disk Transfer Address (DTA)
 1Bh (27)                Get FAT Information for Current Drive
 1Ch (27)                Get FAT Information for Specified Drive
 1Dh (29)                Reserved
 1Eh (30)                Reserved
 1Fh (31)                Reserved
 20h (32)                Reserved
 21h (33)                Random Read, Using FCBs
 22h (34)                Random Write, Using FCBs
 23h (35)                Get File Size, Using FCBs
 24h (36)                Set Random-Record Field, Using FCBs
 25h (37)                Set Interrupt Vector
 26h (38)                Create Program Segment
 27h (39)                Random Block Read, Using FCBs
 28h (40)                Random Block Write, Using FCBs
 29h (41)                Parse Filename
 2Ah (42)                Get System Date
 2Bh (43)                Set System Date
 2Ch (44)                Get System Time
 2Dh (45)                Set System Time
 2Eh (46)                Set or Reset VERIFY Switch
 2Fh (47)                Get Disk Transfer Address (DTA)
 30h (48)                Get DOS Version Number
 31h (49)                Terminate and Stay Resident
 32h (50)                Reserved
 33h (51)                Get or Set Ctrl-Break Status
 34h (52)                Reserved
 35h (53)                Get Interrupt Vector
 36h (54)                Get Disk Free Space
 37h (55)                Reserved
 38h (56)                Get or Set Country-Dependent Information
 39h (57)                Create Directory (MKDIR)
 3Ah (58)                Remove Directory (RMDIR)
 3Bh (59)                Change Directory (CHDIR)
 3Ch (60)                Create a File (CREAT)
 3Dh (61)                Open a File
 3Eh (62)                Close a File Handle
 3Fh (63)                Read from File or Device, Using a Handle
 40h (64)                Write to File or Device, Using a Handle
 41h (65)                Delete File (UNLINK)
 42h (66)                Move File Pointer (LSEEK)
 43h (67)                Get or Set File Attributes (CHMOD)
 44h (68)                I/O Control for Devices (IOCTL)             Overview
 4400h (68-0)            IOCTL: Get Device Information
 4401h (68-1)            IOCTL: Set Device Information
 4402h (68-2)            IOCTL: Read from Character Device
 4403h (68-3)            IOCTL: Write to Character Device
 4404h (68-4)            IOCTL: Read from Block Device
 4405h (68-5)            IOCTL: Write to Block Device
 4406h (68-6)            IOCTL: Get Input Status
 4407h (68-7)            IOCTL: Get Output Status
 4408h (68-8)            IOCTL: Is Device Removable?                . DOS 3.0
 4409h (68-9)            IOCTL: Is Logical Device Remote?           . DOS 3.1
 440Ah (68-10)           IOCTL: Is Handle Remote?                   . DOS 3.1
 440Bh (68-11)           IOCTL: Change Sharing Retry Count          . DOS 3.0
 440Dh (68-13)           IOCTL: Generic IOCTL Request               . DOS 3.2
 440Eh (68-14)           IOCTL: Get Logical Drive                   . DOS 3.2
 440Fh (68-15)           IOCTL: Set Logical Drive                   . DOS 3.2
 45h (69)                Duplicate a File Handle (DUP)
 46h (70)                Force Handle Duplication (FORCDUP)
 47h (71)                Get Current Directory
 48h (72)                Allocate Memory
 49h (73)                Free Allocated Memory
 4Ah (74)                Modify Memory Allocation (SETBLOCK)
 4Bh (75)                Load or Execute a Program (EXEC)
 4Ch (76)                Terminate a Process (EXIT)
 4Dh (77)                Get Return Code of a Subprocess (WAIT)
 4Eh (78)                Find First Matching File (FIND FIRST)
 4Fh (79)                Find Next Matching File (FIND NEXT)
 50h (80)                Reserved
 51h (81)                Reserved
 52h (82)                Reserved
 53h (83)                Reserved
 54h (84)                Get VERIFY Setting
 55h (85)                Reserved
 56h (86)                Rename a File
 57h (87)                Get or Set a File's Date and Time
 59h (89)                Get Extended Error Information             . DOS 3.0
 5Ah (90)                Create Unique File                         . DOS 3.0
 5Bh (91)                Create New File                            . DOS 3.0
 5Ch (92)                Lock/Unlock File Access                    . DOS 3.0
 5Dh (93)                Reserved
 5E00h (94-0)            Get Machine Name                           . DOS 3.1
 5E02h (94-2)            Set Printer Setup                          . DOS 3.1
 5E03h (94-3)            Get Printer Setup                          . DOS 3.1
 5F02h (95-2)            Get Redirection List Entry                 . DOS 3.1
 5F03h (95-3)            Redirect Device                            . DOS 3.1
 5F04h (95-4)            Cancel Redirection                         . DOS 3.1
 60h (96)                Reserved
 61h (97)                Reserved
 62h (98)                Get PSP Address                            . DOS 3.0