The big XY mux is finally gone! I’ve been bumping up against limits in this part of the design since 2014-06-03, but it’s all sorted out now. I moved the Memory Read bit in microcode up to make room to […]

Implemented high-byte loads for the 8-bit registers, tests for these all now exist and pass. Started thinking about implementing shifts, looked at barrel shifters but they’re far too much logic for now (~64 muxes, which would be ~128 chips), and […]