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Hello. I have a problem with two games, i.e. Double Dragon II and P.O.W. - both are bootlegs and I have no sound in both. I checked both boards and the amp with a logic probe and everything looks ok. On the 5th pin of the amp, the probe has a floating signal (you can then hear a quiet sound...

ok, following your advice I will check the voltages and heating chips

I agree with you, but in this particular case - I don't know if it has anything to do with the "size" of the PCB itself, but the game starts without any problems when I raise the voltage above 5V.

photos of both PCBs at @promking request

dm

Thank you for your answer. Could you tell me exactly what chips you used? I ask because I see that there are several versions of GAL16V8 with different endings a, b, c etc. and exactly what 8mb chips did you use?

Hello. I can't find any current information about a possible conversion of MK2 from 4mb to 8mb rom version. I know that you can upload a batch from version 3.1 but is it possible to replace the PAL/GAL A-17748 chip with another one so that the game works 100%. I have two MK2 boards but without...

Hello. I have a small problem with my game Big Figth - Big trouble in the atlantic ocean and I am looking for a manual for it. Or information about the optimal voltage for this arcade PCB. Yes, I know you will write me 5V but sometimes some games like a little more and others a little less and...

Widzę, że tu jednak jest ktoś z Polski. Witaj Sp33dFre4k ;)

Hello. My name is Michael and I come from Poland. I have several dozen arcade games. I want to find some information and in the future expand the collection so I registered on this forum. Greetings to all, Michał