System information

FUNCTION 12: RETURN VERSION NUMBER

Entry Parameters:

Returned Value: Version Number

Registers HL:

Function 12 provides information that allows version independent programming. A two-byte

value is returned, with H = 00 designating the CP/M release (H = 01 for MP/M) and L = 00 for

all releases previous to 2.0. CP/M 2.0 returns a hexadecimal 20 in register L, with subsequent

version 2 releases in the hexadecimal range 21, 22, through 2F. Using Function 12, for example,

the user can write application programs that provide both sequential and random access

functions.

FUNCTION 13: RESET DISK SYSTEM

Entry Parameters:

The Reset Disk function is used to programmatically restore the file system to a reset state where

all disks are set to Read-Write. See functions 28 and 29, only disk drive A is selected, and the

default DMA address is reset to BOOT+0080H. This function can be used, for example, by an

application program that requires a disk change without a system reboot.

5.2 Call Conventions CP/M Operating System Manual

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