On: How I coded in 1985

[DanBC]

(http://www.youtube.com/watch?v=w_znRopGtbE) for transistors, but it feels like cheating.

Relays are doable from scratch (mining and refining copper; winding coils, etc etc) but it's going to be pretty hard work and you're going to have a very slow computer at the end of it.