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Neo Geo JAMMA Connector Pinout Sheet
Solder Side    Parts Side
Ground (GND) A 1 Ground (GND)
Ground (GND) B 2 Ground (GND)
+5v C 3 +5v
+5v D 4 +5v
- Not Connected - E 5 - Not Connected -
+12v F 6 +12V
KEY (Blank) H 7 KEY (Blank)
Coin Counter #2 J 8 Coin Counter #1
Coin Lockout K 9 Coin Lockout
Speaker (-) (Left) L 10 Speaker (+) (Right)
Test Switch M 11 Audio (+) (Mono)
Video Green N 12 Video Red
Video Sync P 13 Video Blue
Service Switch R 14 Video Ground (GND)
Coin Switch #4 (P2) S 15 Coin Switch #3 (P1)
Coin Switch #2 (P2) T 16 Coin Switch #1 (P1)
Player 2 - Start U 17 Player 1 - Start
Player 2 - Up V 18 Player 1 - Up
Player 2 - Down W 19 Player 1 - Down
Player 2 - Left X 20 Player 1 - Left
Player 2 - Right Y 21 Player 1 - Right
Player 2 - Button 1 Z 22 Player 1 - Button 1
Player 2 - Button 2 a 23 Player 1 - Button 2
Player 2 - Button 3 b 24 Player 1 - Button 3
Player 2 - Button 4 c 25 Player 1 - Button 4
Select Button - Down d 26 Select Button - Up
Ground (GND) e 27 Ground (GND)
Ground (GND) f 28 Ground (GND)