After building a breadboard CPU and getting it to run Snake, I decided to do something different. I've always wanted to do a backplane build and also wanted to try my have at PCBs, so started with a custom backplane and custom proto cards for it.
Have done some coding for the Commander X16, so started out with a 6502-based CPU board. My childhood machine was a TI-99/4A, so wanted to try out a TMS9918 for video output.
So far, I've built up 5 cards on the proto boards.
- Three-way clock module heavily inspired by James Sharman's design.
- 6502 CPU card
- RAM/ROM card with 32KB of each.
- LCD card (with support for graphics LCD)
- TMS9918 display card