Well, here it is, the first video game system ever made. No Roms. No CPU. No color. No sound. No nothing. This thing was developed by Ralph Baer in like the late 50's using technology developed by the pentagon or something. The guy still has the "brown box," the prototype for this thing. Games work like the PC-50X machines, no actual rom on the carts but dedicated chips that interact with the machine to create different games. Funny because the interchangeable game concept didn't catch on right away and the gaming public had to suffer years of boring pong machines.
Came with color overlays and other accessories, like dice, game boards, play money, etc. Pretty rare nowadays, pops up on Ebay now and then and usually goes for about $150 -$200 depending on condition.
There are at least 2 known clones, the Kanal-34 (released in Sweeden, Pics needed please) and the Overkal, a spanish clone.