Our Atari 800 is still hooked up and operational. My kids (now all in their 20s) came home with college friends and showed them some of their favorite games on it (like JumpMan! and M.U.L.E.).
(Luckily, MAME runs Atari M.U.L.E. beautifully under Linux.)
M.U.L.E. Is still one of the best games ever made. They had another game called Seven Cities of Gold. It was pretty fun too. I doubt you could make that game today but it was fun to play with friends on the reservation.