The COP421 handheld space invaders game from patent US4345764 is working in MAME.
There's not much to show, just a bunch of leds:
As you can see, there are 9*12(108) red leds on that screenshot for player and bullets. But it actually only has 9 red leds, on a horizontal user-controlled rail with 12 possible positions. I don't think this game was released, seems unncessarily complex.