Mix an old-fashioned 65C02 with the modern octacore Propeller, and you get a Propeddle.

There is a real 65C02 processor and a real Static RAM chip in the circuit, but a Parallax Propeller determines how the 65C02 “sees” its environment, and also helps with tasks that are relatively difficult to implement in hardware, such as video. And it’s fully open source available for download.