Frogger - random graphics and beeping

rchadd

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Hi last night I tested an old Frogger pcb I bought ages ago as working but hadn't had cab to test it.

I now have supergun that uses a PC ATX PSU and connected to a TV. I used a Konami to Jamma adaptor that I had and I know worked fine with a Hyper Olympics pcb.

Clearly the Frogger board is not working. I get random graphics appearing and flashing all over the screen and beeping sound.

Any suggestions on where to start? Guess i need to remove the chips and clean their legs?

One thing i did notice with the adapter...on the Frogger side there is a -5V psu connection but it is not connected on the Jamma side. ATX PSU does not output -5V.

Could this be simple reason for the board not working? Is the -5V required for the board to run successfully?

What is -5V used for on the board?

i hope you can help!

thanks
 
Hi last night I tested an old Frogger pcb I bought ages ago as working but hadn't had cab to test it.

I now have supergun that uses a PC ATX PSU and connected to a TV. I used a Konami to Jamma adaptor that I had and I know worked fine with a Hyper Olympics pcb.

Clearly the Frogger board is not working. I get random graphics appearing and flashing all over the screen and beeping sound.

Any suggestions on where to start? Guess i need to remove the chips and clean their legs?

One thing i did notice with the adapter...on the Frogger side there is a -5V psu connection but it is not connected on the Jamma side. ATX PSU does not output -5V.

Could this be simple reason for the board not working? Is the -5V required for the board to run successfully?

What is -5V used for on the board?

i hope you can help!

thanks
hook up the -5
 
Unfortunately the supergun i am using does not support -5V as the PC ATX PSU does not output -5V!

Guess i need to get an arcade switching PSU and try and wire it up -5V suppliy additionally to the jamma connector to verify if this is cause of the problem.
 

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