I used to have some Atari and maybe a Coleco and some other system. I think it had a keyboard and the cartridges would plug-in on the side? For the former, I had stuff like Keystone Capers, Taz, Qbert, Computer Chess, Asteroids, the glitchy Pac-Man, Joust, Donkey Kong, Moon Patrol which needs to be made in 3-D, Centipede, as well as a broken Indiana Jones; for the latter I had Bust Out, Skateboardin', Clowns and Balloons, and this crazy game called Goats and Cliffs or something like that. I have no idea if anyone has ever played those last 4, but I played those a lot in my childhood.