Backplane 6502 Build

My first pass at a "Desktop PC" 6502. A backplane is a board with a bunch of connectors on it where the vast majority of functionality is added via cards inserted into the connectors. For my purposes this means I can break my computer up into a set of modules that are each replacable, that way if I have to change how the processor is wired up, I don't have to spin a whole new large board with expansion connectors. This will make it easier to take breadboard prototypes and turn them into soldered ones with more reliable and predictable connections.

Goals

Have a soldered together 6502 computer that is connected to the RA8875 display, as well as a serial connection. Input via PS/2 keyboard and SEGA controller. Oh and definitely has blinkenlights.

This is meant both to be my desktop 6502 that will live on my bench, but also the platform for me to prototype the peripherials and software for my Laptop 6502.

Pin Map

Still working this out... there is a symbol in the schematics/ directory of one potential layout.

Currently thinking 2 card edge connectors, 50 pins, 25 on each side for the first one, 30 pins, 15 on each side for the second. It's a lot of pins but it will allow me to expand over time without worrying that I'll have conflicts.