System information

0 System Reset 19 Delete File
1 Console Input 20 Read Sequential
2 Console Output 21 Write Sequential
3 Reader Input 22 Make File
4 Punch Output 23 Rename File
5 List Output 24 Return Login Vector
6 Direct Console I/O 25 Return Current Disk
7 Get I/O Byte 26 Set DMA Address
8 Set I/O Byte 27 Get Addr(Alloc)
9 Print String 28 Write Protect Disk
10 Read Console Buffer 29 Get R/O Vector
11 Get Console Status 30 Set File Attributes
12 Return Version Number 31 Get Addr(Disk Parms)
13 Reset Disk System 32 Set/Get User Code
14 Select Disk 33 Read Random
15 Open File 34 Write Random
16 Close File 35 Compute File Size
17 Search for First 36 Set Random Record
18 Search for Next 37 Reset Drive
40 Write Random with Zero Fill
Functions 28 and 32 should be avoided in application programs to maintain upward compatibility
with CP/M.
5.2 Call Conventions CP/M Operating System Manual
5-5