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.<p>It's amazing that anything ever got working at all...