In this series, I'm taking Ben Eater's breadboard 6502 and turning it into a VIC-20, with out using the hard to get VIC chip.
Instead, I'll replace it's function with simple TTL logic and EPROMs.
If you've ever wanted a deeper understanding of how the VIC-20 works, then this series is for you.
Part 1: CPU - https://youtu.be/epuP5fAuRj0
Part 2: Raster generator - https://youtu.be/Qv5tEn72Luc
The schematic diagram for this build is available at:
https://github.com/Turing6502/VIC20