An iMac G3 goes MAME: the arcadiMac
Months back, I asked for help doing something with an old, button-cute indigo iMac G3. I got a lot of great suggestions, but I never could quite get over the idea of using the little computer fruit for a MAME cabinet.
Mac modder Napes arcadimac project might just get me off of my ponderous duff to do so. The project installs an old iMac G3 running at 233MHz in a table top cabinet, wiring the real arcade buttons and joysticks through a USB controller interface and mapping the keys with QuickKeys. End cost: under $200. And it's even toilet height!

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Very cool. Now I have something to do with my old iMac G3...
Reeeeaallllyy.....
hmmmm, I just inherited an imac g3 myself, and whilst googling about for something to do with it, happened across your original post, which made me laugh.
But I skimmed over the original's MAME cabinet idea ... didn't think I could make it work for cheap enough.
Now, though ... under $200 you say?
Perhaps the only barrier will be my lack of carpentry skill!
you can gut the g3 and make it fit into a smaller case.
THEN you can really use the sh*tter and game!
He's committing arcade sacrilege by playing Tac/Scan without a spinner though.