Strange control problem on 4 player Demolition Derby

Vectorman

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Strange control problem on 4 player Demolition Derby

I've got a 4 player demolition derby with strange symptoms. If you unplug all the steering boards and then plug them in one at a time, all of them work perfectly. But with all 4 plugged in, players 1 and 2 don't work right. They seem even to affect player 3 and 4 when they are turned. Weird...I'm guessing it's a problem on the super sound I/O board, but can anyone give me some direction as to what to replace first?

Thanks,
John
 
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