Air Duel Irem 1990 ------------------- PARTS | SOLDER ---------------+------------------- GND 1 A GND GND 2 B GND +5 3 C +5 +5 4 D +5 5 E -12 6 F +12 7 G 8 H 9 I SPEAKER 10 J SPEAKER 11 K RED 12 L SYNC BLUE 13 M GREEN 14 N 15 O 16 P 1P START 17 Q 2P START 1P UP 18 R 2P UP 1P DOWN 19 S 2P DOWN 1P LEFT 20 T 2P LEFT 1P RIGHT 21 U 2P RIGHT 1P FIRE 1 22 V 2P FIRE 1 1P FIRE 2 23 W 2P FIRE 2 1P FIRE 3 24 X 2P FIRE 3 25 Y 26 Z GND 27 i GND GND 28 ii GND