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Help needed adding buttons to my control panel
Dr Zero:
Sounds like you might have some of what you will need there already since its a 4 player cab so here are some links that explain the harness in more detail
http://en.wikipedia.org/wiki/Kick_harness
The kick harness, also known as the extra harness or plus harness, is a set of additional connectors that allow arcade PCBs to have extra inputs beyond what the JAMMA wiring standard allows. A typical JAMMA PCB supports only 1 joystick and 3 buttons each for 2 players. JAMMA boards that require this extra harness are referred to as JAMMA+ or JAMMA Plus boards.
http://www.arcaderepairtips.com/2010/03/24/getting-familiar-with-the-jamma-standard/
http://www.jamma-nation-x.com/jammax/multikickharness.html