It’s a surprise then to find that a working CPU can be made with just a single NOR gate — which is what is at the heart of [Dennis Kuschel]’s My4th single board discrete logic computer.

Texas Instruments’ 5400 and 7400 TTL quad 2-input NAND gate has been in continuous production ... yet it doesn’t trip off the tongue when listing famous chips, and none of us can name its ...