Rewire the cabinet.
I had to rewire the cabinet, due to various reasons:
- The LP-24 keyboard-encoder uses two grounds, instead
- The 3 extra buttons/player are supposed to be connected
to the LP-24 instead of an extra board.
- The Mame-specific buttons also need to be connected.
I just removed all old wires and replaced them with new
wires. I then connected some grounds for testing with
the original SFII-pcb. I plugged the cabinet in again
and turned the switch...