http://www.mame.net/
My brother scooped out a bunch of the games here and burnded 'em on a CD for Christmas. (He's got a fast connection... faster than mine.)
These are the real thing. So real that they are, in fact, illegal. So don't download the Multiple Arcade Machine Emulator, and don't download the Eprom memory for the original arcade machines...
Finally got back to this thread. cjhsa: did you say Tommy's? In Harvard Square? Yeah, I dropped a lot of quarters into the pinball machines. A good day at pinball. Pay for one game... win... three hours later quit, because the arms are tired, with credits left on the machine.