The earlier DEC machines had a wire-wrap backplane. The wire-wrap assembly was a...

The earlier DEC machines had a wire-wrap backplane. The wire-wrap assembly was automated - which was just as well:

https://upload.wikimedia.org/wikipedia/commons/f/f7/PDP-10_1...

I think it's hard to be amazed enough at projects like the Amiga. Custom chips prototyped with discrete logic and a complete multitasking OS - all built from scratch.