From 31st May 2023 - IC sockets, decoupling capacitors...
to 22nd July 2023...
Here we have 39 × 2CC = 9F6C. The thing almost worked first time - but one of the 74283s had got inserted without its pin 1 (it was inadvertently bent away from the socket)...giving obviously wrong results like 3F × 000 = 0200. Incredibly (given the mess of wiring), that was the only issue.
