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A (down) B (up) -------------------------------------------------- -5V 1 +12V SPKR1 2 SPKR2 2P fire 1 3 2P fire 2 2P left 4 2P right 1P start 5 2P start 1P fire 2 6 2P up 1P fire 1 7 service 1P right 8 1P left 1P up 9 2P down Coin 1 10 Coin 2 1P down 11 Coin counter 12 Green 13 Blue Red 14 Sync (composite negative) 15 GND 16 GND GND 17 GND +5V 18 +5V