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J-PAC/Jamma Plus
BobA:
The main ground should be daisy chained to the COM terminal of all your switches. Most of the grounds are connected together when a board is plugged into the jamma harness.
paigeoliver:
If it is a Street Fighter 2 then button 4 should also be on the extra harness and not on the main jamma edge.
It seems like Neo Geo was the only common game that put button 4 on the edge connector.
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