The internet archive made hundreds of MS Dos games available not too long ago. https://archive.org/details/softwarelibrary_msdos_games
Thinking about one of these with the atari app http://www.amazon.co.uk/iCade-Arcade-Gaming-Cabinet-iPad/dp/B004YC4NH6/ref=pd_ybh_1
Manic Miner or The Boss. Or the old tennis game that plugged into your tele (two sticks and a square ball).