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by Veedrac 3241 days ago
A friend of mine made an even more minimal thing. Turns out he still has an internet version:

http://people.ds.cam.ac.uk/ajn44/linelogic2/

You basically have arbitrary-arity NOR gates, that are your only way of splitting signals. From it you can make anything from XORs to flip-flops to clock signals to anything you want. I remember him making a very fancy 8-segment display counter (that actually counted up over time) in one version of it back in the day.