This is stuff of nightmares at the start. I remember my first year doing my BEng. Discovered the wiring of the 32bit address bus was out by one. The wraps were

This is stuff of nightmares at the start. I remember my first year doing my BEng. Discovered the wiring of the 32bit address bus was out by one. The wraps were on the bottom layer as well. This forced me to get my schematics right before starting the wiring wrapping. Plenty of other lesson learns as well.