Mattel's answer to the Atari 2600, the Intellivision was a console that, for reasons that can't be reasonably explained, used a metal disc and keypad for controls. Have fun with that!
The console sported a CP1610 CPU running at a blistering 894.886 kHz (yes, that's a "k"), technically making it the very first 16-bit video game console.
Also rebadged as the Radio Shack TandyVision, the GTE-Sylvania Intellivision, and the Sears Super Video Arcade.