EMSL writes:

After our Tabletop Pong project, someone suggested that we should check out the Tomy Blip, a handheld game dating to 1977. And so we did. We snagged one on eBay, and here it is: “Blip, the digital game.” Blip is unlike any other handheld that I’ve played, and (as you’ll see) it’s quite a piece of engineering. In what follows, we give it a test drive, and then take it apart and see what makes it tick.

Check out their careful examination of what makes Blip tick.