Mostly old school games. 2600, 5200, 7800, C64, Atari 8-bit computers, Colecovision, NES, Genesis, Gameboy, NES, Retron 5, Emulators, PS2, Wii, Various incarnations of Rockband, and guitar hero. DDR. I also love fighting games.
the 800xl works...although I'm going to have to open it up and look to look at the ram as it's not showing a full three lines of green squares (no red though).