Click above to get retro games delivered to your door ever month!

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