JAMMA stands for Japanese Arcade Machine Manufacturers Association, a set of standards developed for board pin-outs. 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 not 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 centered in the same position
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Ground Ground +5V +5V -5V +12V KEY Coin Counter 1 Lockout Coil 1 Speaker + Audio + Video Red Video Blue Video Ground Test Switch Coin Switch 1 Player 1 Start Player 1 UP Player 1 DOWN Player 1 LEFT Player 1 RIGHT Player 1 B1 Player 1 B2 Player 1 B3 Player 1 B4 N/A Ground Ground |
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Ground Ground +5V +5V -5V +12V KEY Coin Counter 2 Lockout Coil 2 Speaker - Audio - Video Green Video Sync Service Switch Tilt Switch Coin Switch 2 Player 2 Start Player 2 UP Player 2 DOWN Player 2 LEFT Player 2 RIGHT Player 2 B1 Player 2 B2 Player 2 B3 Player 2 B4 N/A Ground Ground |
[All input pins need ground to be activated (active low)]
(7/H) Key says no connection because there is usually a piece of plastic placed in to this spot which will line up with a slot cut in the PCB. This is to prevent any chance of the connector being put on upside-down.
(8/J) Coin Counter 1 and Coin Counter 2 are outputs. This is a mechanical style counter that increments every time a coin is inserted.
(9/K) Coin Lockouts are outputs. This delivers power to a plunger activated by a solenoid which, when engaged into the coin path of the coin mech, will prevent a valid coin from tripping the coin switch and send it to the coin return slot. When power is fed to the coin door, an electromagnet retracts the plunger so that the coin path becomes open. Few games have coin lockout software in them.
(14) Service Switch puts 1 credit onto the game but does not increment the coin meter.
(S) Test enables the test mode, if the PCB supports it and triggers the test mode software of the game.
(15) Tilt like in pinball games (AKA "Slam" switch). The switch is found on almost all coin doors and is a leaf switch with a weight on the tip of one of them. If you slam the game hard enough, the leaf switch will close. Almost no games have tilt software in them. Behavior ranges from a screeching tone for a few seconds to resetting the entire game.
(16/T) Coin Switch 1 and Coin Switch 2 are inputs. When coin is inserted, a Ground pulse is sent to this pin and credits the game.
(10/L) Speaker +/- is mono. It does not need an external amp. The speaker +/- is for post-amp output directly to the speaker.
(11/M) Audio +/- is for pre-amp outputs but is hardly ever used.
Got any useful ideas or tricks that you'd like to share?
niobium@arcadezone.org