[bpye]

It's been done before - but apparently the performance is pretty poor - https://spritesmods.com/?art=avrcpm

[kragen]

plausibly you could write a faster z80 emulator

[volemo]

At this point I think it’d be more fun to port CP/M to AVR.

[kragen]

i thought about that but you also have to port the apps, many of which use self-modifying code, which flash program memory is not enthusiastic about

[bpye]

Someone on the blog post linked suggested implementing the BIOS calls in AVR code with some sort of mode switch, I guess you could go further. Port CP/M keeping syscall compatibility but use a CPU emulator for application code.

[kragen]

sounds sensible