I'm not sure which version I first used, but I know it was in 1998. I can remember how amazing that discovery was... I also remember waiting for each new update with crazy anticipation! What new games might be added?!? Ahh... the good 'ol days.
And yes, I see the irony of talking about the good 'ol days of MacMAME... since it in turn represents the good ol' days of arcade games. Hmm, nostalgia... of nostalgia.