The Atari Video System X was the prototype console that almost got itself called PAM, but eventually evolved to become the not spectacularly succesful Atari 5200. You can find out more about it here and here, though I can assure this is an incredibly rare console. And a good looking one too. Oh, and you rich people can now own an Atari Video System X prototype via this (US only) VSX eBay auction. The unit is in pristine condition.