EZ-Retro is a Z80 running CP/M Apr 5, 2017
And now something completely different!
I’ve always been fascinated by those 8-bit computers that started it all. As a teenager, I spent many hours reading about them, but never could afford a Z80 system capable enough to run CP/M, for example. While BASIC and games were never my thing…
Floppies were totally out of reach for me. Later came MS-DOS and the PC clones, and things changed. But so did the fun: these were no longer systems to tinker with, all I did was get expansion cards and insert ‘em.
Long-time readers might remember the FPGA-based Z80 I built, end 2015. Great fun, but also not so much about tinkering as about installing an FPGA toochain and generating a pre-defined “bitstream”.
So a few weeks ago, I decided to have yet another go at it, using this huge chip:
This time, it’s really about creating a flexible setup that can run existing Z80 and CP/M software, while using modern techniques to deal with all the practical details:
- EZ-Retro: system overview - Wed
- A truly minimal eZ80 setup - Thu
- Minimal requirements for CP/M - Fri
This is not about re-creating old hardware, but about re-creating a compatible system that lets me try (much of) the old software.