Yep, Mame all the way, back then.
This is me, still a young lad, building my first Mame PC, in the summer of 2003 (6 years after my first encounter with Mame).
Boy, that was a nice summer project, which resulted in this Mame cab:
I had great times with it for years, it even had a dedicated 4-way joystick mounted and I added a spinner s few years later. I still have it, although it hasn't been played for years and I removed most of the guts. It will end on marktplaats soon, I guess.