TEMPEST PINOUTS P20 44-pin 1: GND A: GND 2: +5V B: +5V 3: +22V C: 4: -22V D: 5: Slam E: Coin R 6: Coin L F: Coin C 7: Self Test H: 8: J: Out 3 (jumped to Xinv) 9: Blue K: Out 4 (jumped to Yinv) 10: Red L: Green 11: M: Video GND 12: Counter L N: Counter R 13: Sw GND P: Counter C 14: +10.6V R: 15: X inv S: Y inv 16: X GND T: X out 17: Y out U: Y GND 18: V: 19: W: 20: X: 21: +Sense Y: +5V 22: -Sense Z: GND P-18 (Aux. Board) 1: GND A: GND 2: +5V B: +5V 3: +22V C: Cocktail(short to GND for Cocktail) 4: -22V D: Audio 1 5: Audio 2 E: 6: F: /Reset 7: Clk 2 H: Clk 1 8: Dir 2 J: Dir 1 9: Fire 1 K: Fire 2 10: Zap 1 L: Zap 2 11: Start 1 M: Start 2 12: LED 1 N: 13: LED 2 P: 14: R: 15: GND S: GND