Thanks. It is all the components of a computer, yep. It was a desktop I had laying around. It's all controlled using the buttons on the controls. I wired the black push button on the side of the machine (above the exhaust fan) to the power on the motherboard like any other computer would have it.
The computer powers up (or down) with the push of that button and automatically boots in the MAME emulator with which I built a custom interface and background for them. From there you can scroll through lists of games or into categories like Flying, Sports, Fighting etc.
Next time I'm over there I'll see where they've put it and get some video.