5 ms·

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

• kragen 3y ago
  plausibly you could write a faster z80 emulator
  • volemo 3y ago
    At this point I think it’d be more fun to port CP/M to AVR.
    • kragen 3y ago
      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 3y ago
        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 3y ago
          sounds sensible