Looking at the system 80 version and I see a familiar 3 chip configuration I am assuming of course its not using RIOT's? +1 for that! My only "concern" is what do we do without our standard 7404 switch matrix fuses that protect the special magic chips. Of course you can't design to account for playfield shorts and anomalies like that. I just bought a bulk lot of RIOTs too and now we have a new board design. I am glad we have multiple options for MPU boards now!