It has long been known that you can build any gate from NAND gates.So you can take an existing model of a computer, turn everything that isn't a NAND into a collection of NAND gates, then run software for the original computer.
Nurysso · · focus · HN ↗
btilly · · focus · HN ↗
So you can take an existing model of a computer, turn everything that isn't a NAND into a collection of NAND gates, then run software for the original computer.