i setup my supergun today with a arcade psu 16A on +5V and 1A +12V and gnd of corse. My arcade board is Athena from SNK (original). Startimg up my supergun, used the poti to ajust +5V. And i got a picture , so far so good. My picture is flipped 180 and i have no sound. I have the instruction sheet but its in japanese.. My questions now: How can i flip the picture? I know there is an option from the arcade board to do this. Do i need the -5V ? And what sound code i have to select on service mode?