@trcwm No, i didn't know that podcast. This is the board i am using:
https://github.com/Z80-Retro

It's a rather simple SBC with Z80, CTC, SIO, 512k RAM and 128k ROM, and a questionably implemented SD card interface that shares an IO port with the RAM banking.

The original designer wrote a CP/M 2.2 BIOS for it, and I took that as a start to write a CP/M3 BIOS. The only thing left from the original is the SPI code for the SD card.

@doot I am a trans woman with 3 PC's, an Atari ST, and multiple SoCs. Around April I started learning Z80 assembly, and since then I have ported CP/M 3 to a new Z80 board.
The sad part is, in the 43 years of my life I have not met a single person who would share even one of those interests.