JAMMA=Japanese Arcade Machine Manufacturers Association
An old group trying to set standards for board pinouts (at arcade machines). This was designed to make board changes easy, just take out the old game and plug in the new. Unfortunately games have evolved, and the Jamma standard is no longer up to the job as it can`t handle more than 4 buttons or two players. Also replacing a board from a different manufacturer meant readjusting the picture on the monitor as it would not be centred in the same position.
28 PIN UNKNOWN CONNECTOR on the arcade machine
| Pin | Description |
|---|---|
| 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 |
| 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.
| Contributor: | Joakim Ögren |
| Source: | JAMMA pinout at Technick.net |
Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-10