Out of similar, in some sense, devices I think Gray-1, "everything from ROM" is rather special. https://hackaday.com/2017/02/02/the-gray-1-a-computer-composed-e

Out of similar, in some sense, devices I think Gray-1, "everything from ROM" is rather special. https://hackaday.com/2017/02/02/the-gray-1-a-computer-composed-entirely-of-rom-and-ram/ https://hackaday.com/2017/02/02/the-gray-1-a-computer-compos...