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 SW1 ---- 1 2 3 4 5 6 7 8 ----------------------------------------------------------------------------- 3 off off Player 2 on off 4 off on 5 on on normal off off Difficulty easy on off hard off on very easy on on not used off off Not Used no sound off Demo Sound sound on on normal off Mode test on SW2 --- 1 2 3 4 5 6 7 8 ------------------------------------------------------------------------------ normal off Screen flip on not used off off Not Used 1 Coin 1 Play off off off off off Coinage 2 1 off on off off off 3 1 off off on off off 4 1 off on on off off 5 1 off off off on off 6 1 off on off on off 1 2 off off on on off 1 3 off on on on off 1 4 off off off off on 1 5 off on off off on 1 6 off off on off on 2 3 off on on off on 3 2 off off off on on 4 3 off on off on on freeplay off on on on on A 1 1 on off off Coin A A 2 1 on on off A 3 1 on off on A 5 1 on on on B 1 2 on off off Coin B B 1 3 on on off B 1 5 on off on B 1 6 on on on