Given the nebulous legal nature of emulation, I can not advocate playing any games that have not been released into the public domain. So far, I have found ways to play Atari 2600, Atari 400/800/5200, Atari 7800, Atari Lynx, Atari ST and Atari arcade games on the MAC via emulation. I own a copy of EVERY retro game compilation for the PC and Playstation 2, and use these games as inspiration for new games that I create. I have recently switched from Windows XP to MAC OS X 10.5 and one of the things I feared upon switching was losing the capability to play all of my old Emulated games.
