I have an NES and the old Atari machine. For the NES- stuff like spyhunter, all marios (including the one with duckhunt) contra, blades of steel, RBI baseball, a bunch more I can't remember. I also have the powerpad. About a year ago a friend and I broke that out... Man is that an exercise!
For the Atari- games like pac-man, space invaders, donkey kong, street car racers, and the airplane games, basketball, and baseball