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I checked the wiring one every set up I tested it on and the B button just doesnt want to register. It did work but I want to say I plugged the JAMMA harness in backwards and a chip near the JAMMA connector started releasing smoke after about a couple seconds of powering it on. I expect that...

I am not sure where the video chips are or what to try to replace. I assume VRAM or some video processing chip replacement may fix the video issues but audio works fine and the game seems to be running well but here are a couple pictures for reference of the video displayed and the PCB.

I am using an axunworks minigun supergun and it has the regular neo geo db15 controller pinout and I have tried multiple stv games and all of them have these very odd button mappings like up is start and down is up and left is like c or d it seems so random but what could be wrong here? I just...

I plugged in a JAMMA board into my MVS cabinet and there was a pop which sounded like a capacitor exploding and it smelled like burnt plastic. I think I heard it from the top of the 4 slot cabinet where the speakers are but it wasnt an audio sound from the speakers. i heard that JAMMA board can...

The fuse looks good and I think I plugged in an inner pole negative when it should take inner pole positive. Are there any capacitors that I would want to check. Its on an MV-F1Z. I have a little tool specifically for checking capacitance when I desolder them and a multimeter but I only use it...

I was looking for a good cheap and easy custom PCB fabricator service and I came across JLC, which seems to be, by far, the cheapest. I had 5 Supergun Minigun 4p Hat PCBs sent to me for only $5.66. I had to select a specific shipping option and it took about 10 days to arrive after the order was...

I want to switch between two 27C64 eproms. Could this safely be done with a dpst switch that disables or enables the VCC pin and all the other pins are connected or even piggybacked?

The S-ROM is fine its the C-ROM that is messed up. I wish I had photos right now but I tried fixing it and I dont think there will be anything else I can do. I would like to send it to someone to fix it f possible. It looks like all the sprites are moved half way off the screen except for moving...