This a non-sense BIOS written by me, which mostly contains of HALT opcodes only. The reason of this: my CPU emulator catches the HALT opcodes and uses the PC value to tell the position of the HALT code in question and does the needed operation in native mode.

cpm22.asm contains the CCP and BDOS assembly source code of a CP/M v2.2 system in Z80 assembly syntax (though it's a i8080 material which was originally written in i8080 assembly syntax format).

The file has been downloaded from https://github.com/Z80-Retro/cpm-2.2

which states:

CP/M 2.2 Source, Manuals and Utilities

These files were retrieved from The Unofficial CP/M Web site and cleaned up in Feb 2023.

See the git commit history for changes.

For licensing questions on original source code please have a look on file DRI-LicenseAgreement.txt which was also presented there.