A21 Game: Ping pong PCB Pinout Parts Side/Solder Side ------------------------------------------------------------- +12 Volts | 1 | A | ------------------------------------------------------------- Speaker + | 2 | B | Speaker - ------------------------------------------------------------- | 3 | C | ------------------------------------------------------------- | 4 | D | ------------------------------------------------------------- 2P Start | 5 | E | 1P Start ------------------------------------------------------------- 2P Right | 6 | F | 2P Left ------------------------------------------------------------- Service | 7 | H | 1P Paddle ------------------------------------------------------------- 1P Backhand | 8 | J | 1P Right ------------------------------------------------------------- 2P Paddle | 9 | K | 1P Left ------------------------------------------------------------- Coin 1 | 10 | L | Coin 2 ------------------------------------------------------------- Coin cointer 1 | 11 | M | 2P Backhand ------------------------------------------------------------- Coin counter 2 | 12 | N | ------------------------------------------------------------- TV Blue | 13 | P | TV Green ------------------------------------------------------------- TV Sync | 14 | R | TV Red ------------------------------------------------------------- | 15 | S | ------------------------------------------------------------- Ground | 16 | T | Ground ------------------------------------------------------------- Ground | 17 | U | Ground ------------------------------------------------------------- +5 Volts | 18 | V | +5 Volts -------------------------------------------------------------