It was as simple as ripping out the Ultracade computer (which I got $350.00 for on Ebay) and replacing with my new Mame computer. I redid the control panel to include a trackball from Ultimarc, replaced the marquee with a new custom one and I am all set. Still trying to figure out a good way to get Giant Gram 2 or 2000 working (do these run on Demul??).