with the ‘SOLDER SIDE’ and ‘PARTS SIDE’. These terms just reference to
which side of the arcade JAMMA board the connector is on. Such as the
SOLDER SIDE refers to the row of pins on the solder side of the board,
usually without any visible parts – only solder connections. The PARTS
SIDE then would be the row of pins that are on the side of the arcade
board with all the parts (IC’s, resistors, caps, etc.).
Also, the terms N/C throughout the connector just a shortened term for NO CONNECTION.
Power Sections: (Pins A-F, 1-6, e, f, 27, 28)
Most of the first
connections listed on the pinout chart are directly wired from the
arcade cabinets power supply. The main power connections you will always
need is the Ground, +5VDC, and the +12VDC. Some arcade game boards
(Such as boards by Midway) will require the -5VDC connected from the
power supply as well.
It is very important that
you check in on your power supply voltages every once in a while. If
your power supply voltage drifts over time (Since some arcade cabinets
are 20+ years old, there can be some very old power supplies around.),
the supply +5VDC too high (Such as 5.20VDC or more) can greatly increase
the chance of damage to your board!
Video Sections: (Pins N, P, 13-15)
All these connections are
connected directly up to the cabinets monitor. All signals (Red, Blue,
Green, and Sync) are generated on the arcade game board and displayed
on the monitor of course. The arcade monitor requires a Ground signal to
reference all the other signals off of. If your building an adapter to
convert a non-jamma arcade game board to be able to play in your JAMMA
arcade cabinet, be sure that if there is no Video ground on the
non-JAMMA board then jumper over the regular ground into the Video
Coin Sections: (Pins J, K, T, 8, 9, 16)
The Coin Switches are
usually connected directly to the coin mechanisms (coin-mechs) which
detect and trigger when a coin/token is inserted into the machine. The
board will detect the coin inserted from a GROUND single that is
triggered at the coin-mech.
The Coin Lockouts are
optional connections. Some board games can detect when there is a
problem with the board itself. To prevent anyone from losing a quarter
down the coin slot when there is a problem, the Coin Lockout lines are
activated which will energize a lockout coil. The coil will
automatically bypass any coins inserted directly to the eject tray where
you can get your quarter back.
The Coin Counters are
sometimes used, if there is an actual counter located inside the arcade
cabinet. They will just ‘count’ how many coins have been inserted
through the coin shoot.
Joystick / Controller Sections: (Pins V-Y, 18-21)
Basic directions of UP,
DOWN, LEFT, and RIGHT. When the Joystick/Controller is pushed in a
specific direction, such as UP, the controller will trigger the ‘up’
microswitch which will put a GROUND signal on the UP wire.
Button Sections: (Pins V-Y, 18-21)
All the buttons basically
work like the joystick controllers would. When the button is pushed, the
downward motion will trigger a microswitch attached to the bottom of
the button. The one side of the microswitch will always be connected to
GROUND, so when the microswitch is triggered the GROUND signal will be
put on the corresponding button wire.
The standard JAMMA pinout
connection just uses 3 buttons per player, but if connecting a Neo Geo
board (JAMMA) it will use pins c & 25 for the Neo’s button 4.
SPEAKER (-) & (+)
connections route the sound generated on the arcade board up to the
cabinets speaker. This is just a standard MONO signal to only one 8-ohm
TILT (SLAM) SWITCH
connection is sometimes used inside arcade cabinets to detect when the
player is getting a little to ‘rough’ with the machine. It might either
sound an alarm for the game room attendant, or display a warning on the
machine to the player.
The TEST SWITCH will
active when a ground is applied on the test switch wire. If the arcade
board you have connected uses the ‘TEST’ function, it will usually
activate a test function that checks the on-board circuits/ROM’s/etc.
The SERVICE SWITCH is just
like the Test switch, except it will usually enter the internal board
settings similar to a computers BIOS.
The KEY SLOT is a way to
polarize the actual connector itself. This prevents the JAMMA PCB from
being installed backwards in the JAMMA connector.