*For the super techies* Konami GX: Swapping ROM boards

[robivy64]

I have a Twinbee Yahho!! PCB, which of course runs on the Konami GX hardware. Recently the audio DRAM decided to take a dump, and showed up as "BAD" during the system check and the game will not boot.

I hopped on ebay and purchased Konami Open Golf Championship, which uses the same motherboard as Twinbee Yahhoo, with the intention of swapping the ROM boards. I swap the ROM boards, and now I get "22D/M BAD".

The original golf game boots and runs fine, with 22D/M showing as OK. Chip 22D/M is an 8-pin 256 Bit serial EPROM (93c46, soldered).

Any ideas??

[Ex-Cyber]

Is 22D/M the same chip on the Twinbee board as well?

[robivy64]

Is 22D/M the same chip on the Twinbee board as well?

Yep

[robivy64]

I'll also say that Twinbee is Japanese, and the Golf game is US. Perhaps the GX hardware is region locked?

[Stefan_L]

There is a button (marked TEST SW) next to the jamma connector hold it down while starting the game and it will work.

[robivy64]

There is a button (marked TEST SW) next to the jamma connector hold it down while starting the game and it will work.

I'll give that a shot when I get home, thanks! I assume you have seen this error yourself?

[robivy64]

There is a button (marked TEST SW) next to the jamma connector hold it down while starting the game and it will work.

WIN

Thank you sir!