ALU Construction: 1-bit Logic Full Construction
Before powering this new circuitry up I did some spot checking with a multimeter and straight away found some mis-wired connections ... although being as I chose to use wire wrap it's trivial to correct mistakes. With everything then looking good it was time to stick in some relays and apply the power:
All working as expected! This actually represents a bit of a mini-milestone in the construction and it's really nice to see something physical emerging from all the drawings and designs. There's a long way to go to finish this card off (and even further to finish the computer in general) but seeing some success along the way has given me the little lift needed to keep me committed to all the soldering and wire wrapping that's to come.