First of all, the overall design has been radically changed to something simpler and, I think, more elegant. See the 'Details' section for, well, details. There's a new architecture diagram and I have included a summary of the instruction format and opcodes.

Secondly, I have begun to release design files, starting with the logic gate modules. You'll find the KiCAD schematic and PCB files, as well as gerbers suitable for sending to a board house.

Lastly, I have just received the PCBs for core H-bridge drivers. There are 8 per module:

These drivers will need additional logic to set the individual H-bridge directions. This logic in turn will be controlled by the data state (whether we are writing a '0' or '1') and gated by the row/column address decoder outputs. I am currently prototyping the H-bridge control logic.