Connector - JAMMAJAMMA=Japanese Arcade Machine Manufacturers AssociationAn old group trying to set standards for board pinouts (at arcade machines).This was designed to make board changes easy, just take out the oldgame and plug in the new. Unfortunately games have evolved, and the Jammastandard is no longer up to the job as it can`t handle more than 4 buttons ortwo players. Also replacing a board from a different manufacturer meantreadjusting the picture on the monitor as it would not be centred in the sameposition. 28 PIN UNKNOWN CONNECTOR on the arcade machine Pin | Description |
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A | Ground | B | Ground | C | +5V | D | +5V | E | -5V | F | +12V | H | Key (no connection) | J | Meter 2 | K | Lockout 2 | L | Speaker - | M | Audio Ground | N | Video Green | P | Video Sync | R | Service Switch | S | Tilt Switch "Pinball Slam" | T | Coin 2 | U | 2 Player start | V | Player 2 Up | W | Player 2 Down | X | Player 2 Left | Y | Player 2 Right | Z | Player 2 Button 1 | Aa | Player 2 Button 2 | Ab | Player 2 Button 3 | Ac | (Player 2 Button 4) | Ad | Not used | Ae | Ground | Af | Ground |
Component side Pin | Description | 1 | Ground | 2 | Ground | 3 | +5V | 4 | +5V | 5 | -5V | 6 | +12V | 7 | Key (no connection) | 8 | Meter 1 | 9 | Lockout 1 | 10 | Speaker + | 11 | Audio + | 12 | Video Red | 13 | Video Blue | 14 | Video Ground | 15 | Test Switch | 16 | Coin 1 | 17 | 1 Player start | 18 | Player 1 Up | 19 | Player 1 Down | 20 | Player 1 Left | 21 | Player 1 Right | 22 | Player 1 Button 1 | 23 | Player 1 Button 2 | 24 | Player 1 Button 3 | 25 | (Player 1 Button 4) | 26 | Not used | 27 | Ground | 28 | Ground | Note: All signals are active low.
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