Blast city grounding issue?

[indierocklocks]

Any help appreciated.

For some reason out of the blue my P1 loom started putting directions in an auto fire type state--making it impossible to select a character in KOF98 for example. And for certain games the buttons are pressed constantly.

When I plug the same amp plug into p2 using the same stick/buttons the problem stops.

I popped the ground pins out of both ends of the amp--and the connections to the wires look fine.

What could be wrong and what should my next step be? I do have a multimeter if needed.

 

[Xian Xi]

Try resetting your backup ram first.

 

[indierocklocks]

Thanks Xian Xi...that did the trick--thought I did that in the hardware test settings...but I may have had my buttons messed up. Flipping all the dips on the board took away doubt. Thanks again.

Edit: just curious as to how the backup ram works and what exactly it stores? It may help for me to understand it for the future of troubleshooting.