How does anyone know that these protos that mysteriously surface out of nowhere after 20+ years are real? Wouldn't it be relatively easy for someone who knows how to program the Atari 800 really well to create a 5200 proto? It wouldn't even have to be a finished, working game(5200 Tempest) for everyone to go nuts over it and start a bidding war. From what I've seen, it's not hard at all to edit 2600 .bin's to alter the graphics etc. to make it look like an new, undiscovered game.