These are the arcade machines i've been playing with for the past few days/weeks.

Pengo running in the Scramble cabinet on the left. Tron is in the Tron cabinet on the right.
I also have a Tron 'Mini' cabinet, also in that room but it has a non-functioning Satan's Hollow boardset in it right now. That's why the joystick is red instead of blue.
The Scramble cabinet has a breakout doojoby that i built yesterday, which you can see (kind of) in this image. The board on the bottom is Pengo. Then above that is a small board which brings Pengo to the "JAMMA" standard. From there is a board that brings it from JAMMA to "Scramble", where it is plugged into the cabinet itself.
I also had to put in a new power supply. This one is from an old Digital GiGi terminal. The silvery box in there to the left is the power supply that came with the cabinet. It doesn't seem to work.


Okay, here's what i'm really happy about. I just made a JAMMA to Dig-Dug adapter built, so now I can play either Pengo or Dig-Dug in the Scramble cabinet. here are some pics...