SUPER ZAXXON Sega - 1982 Zaxxon / Super Zaxxon / Congo Bongo SOLDER SIDE | PARTS SIDE Gnd | A | 1 | Gnd Gnd | B | 2 | Gnd +5V | C | 3 | +5V +5V | D | 4 | +5V -5V | E | 5 | -5V +12V | F | 6 | (+12V) [from P4-4 & to Spkr?] Spkr - | H | 7 | Spkr + [from P4-3 & to Spkr?] (Coin Meter A) | J | 8 | (Coin Meter B) Coin Mech A | K | 9 | Coin Mech B Reset | L | 10| Service Switch P1 Start | M | 11| P2 Start P1 Left | N | 12| P1 Right P1 Up | P | 13| P1 Down P1 Fire | R | 14| (P1 Spare) (P2 Left) | S | 15| (P2 Right) (P2 Up) | T | 16| (P2 Down) (P2 Fire) | U | 17| (P2 Spare) (Gnd) | V | 18| (Gnd) R | W | 19| G B | X | 20| Comp Sync * (Gnd) | Y | 21| (Gnd) (Gnd) | Z | 22| (Gnd) * At the bottom center of the Sound II board, there is a section labeled "Color Conv." At the far left you will see switch #4 (SW4). If this switch is off ("0"), you will get JAMMA compatible negative composite sync. If it is on ("1"), you will get positive composite sync.