The ROM cartridge file at atarimania.com seems to be the only functional version. The only way to play, of course, is to start off at the banana level. Sure, you still have to suffer through the 2000-point pears once in a while, but it's still a small price to pay. But I guess I'm just simple minded like that, and not willing to start at the gummy bear level and take my chances. So far, I'm at about 18 levels away from that initial banana level. The game is practically impossible at this point, as Ms. Pac-Man has become far too overweight and unable to travel at a fast enough speed, even when not eating the iconic dots! Use lots of corners and the exits to stay ahead of the vicious ghosts.
Whoever programmed this must've done Joust as well. Can't fault a guy for being prolific, I guess. Pac-Man Jr. as well. They clearly mastered the ancient art of multiple player/missiles.