MSmsarnoff·Mar 21, 2020
Hi HN, project author here. The source code and design files are on GitHub: https://github.com/74hc595/Amethyst
Documentation is lacking, sadly. My intent was to create a series of in-depth videos describing how various aspects of the system work in detail, but I'm somewhat behind on that.
For folks that say "using an ATMEGA is cheating":... I agree! That was a guiding principle behind my 6809 computer project (Ultim809)--use only period hardware and no programmable chips (apart from EPROM). Amethyst originated a bit differently. Initially it started out as a neat hack to get 8-bit color video from a non-overclocked AVR without expensive external chips. And then I discovered the mechanical keyboard community and was able to source keyswitches and keycaps, and, well, in for a penny, in for a pound.
In Build an 8-bit home computer with 5 chips