Motorola 68030 wire wrap prototype
Wow, wire wrap.  That could be a nightmare to debug, because the contact between the wrap and the post could be flaky.  And if you had to change something, you often had to cut a wire, but you couldn't remove it, because there was too great a chance of disturbing something else in the rat's nest of wires.  But that left obsolete wires with cut ends, and they could also on occasion make contact.It's amazing that anything ever got working at all...