Which mac? Color or monochrome?
I believe OP's asking about running emulators ON a mac... not emulators OF a mac. In which case... ark_ader, your point for this thread is mostly moot.
If you want to do just MAME... like I said, SDLMame is the way to go. You can run it via terminal.app or via something like AttractMode. I Think the 2008 was intel right? I can't remember when they stopped doing PPC. In any case, SDLMame is intel mac only.