The first home system developed by Atari that took interchangeable carts.
Very interesting control scheme there, with a big knob at the top and also a pseudo cross pad at the bottom. Games were selected via the switches at the bottom.
Carts didn't have roms but chips that produced games (similar to the PC-50X series of consoles.) Only nine games would have ever been available. 86'ed in favor of the 2600.