Let the gaming begin!
Today the first prototype board for functionality in Stage2-3 arrived. It was the addon for a dual joystick port based on the 6522 VIA chip. The board is based on the Prototype Expansion Header located on the Stage 1 board and is included in the design for Stage 2. The other part I want to make a prototype for, before ordering Stage 2, is the IRQ handler, a circuit that can handle prioritized IRQ requests and also turn off IRQ below a certain level.
There is also a rudimetery SPI port available on this prototype, I wanted to test the viability of 6522 based SPI.