Zinfer
Well-known member
Just putzing around here working on a Konami Jamma Top Gunner. I have one board that's fully working - the other not so much. So my first step was to pull the Eproms and reseat. Still nothing. So I swap Eproms. Yay - it works. But the title Graphic is kinda screwed up. I pull the 4 custom chips off and replace. Yay it's fully working. Now that I know the problem is in the Eproms and the customs I wanted to find out what the custom IC's are. 8644's? Are those Proms?
Also looking up the eproms. 3 of them. NEC D27256d NEC D27128D Toshiba TMM27512D-20 What a hodge podge...trying to figure the right Eproms to use and something about these 4 custom chips.
Also looking up the eproms. 3 of them. NEC D27256d NEC D27128D Toshiba TMM27512D-20 What a hodge podge...trying to figure the right Eproms to use and something about these 4 custom chips.