Jamma button wiring

lopan2008

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I recently installed a Gamebox 450-in-1 into my Jamma cabinet. I currently only have 3 buttons and would like to add 3 more so that all games are playable.

Here is my question: The manual that came with the Gamebox shows a Jamma standard diagram with 6 buttons wired to it (using slots 22-27). However, every other Jamma diagram I have seen lists slot 27 as a ground. Which is correct?

My current harness has as set of wires installed on 27 and I just want to make sure of which set up is correct before making changes.
 
27 as a ground is correct but these Chinese knock-offs have modified the Jamma harness in order to give you six buttons per player. If you want to use the board you will need to rewire your Jamma harness.
 
But will doing that mess up the harness for use with normal Jamma boards ? If so then I will just install # 4 and 5 and leave 6 out of the mix. I would rather have a good harness than Street Fighter.
 
There are 4 grounds on that end of the Jamma connection. Rewiring the connector to the Chinese standard will still allow you to have two of the four grounds. They should be sufficient, especially for casual home use.
 
Ok, last question: So I could potentially combine the wires from 27 with the ones from 28 and have no issues? If so I now have a project for after work tomorrow.
 
Ok, last question: So I could potentially combine the wires from 27 with the ones from 28 and have no issues? If so I now have a project for after work tomorrow.


I don't know what you are asking. You can pull the wire currently in slot 27 and install a different wire that you then wire up to button 6 on your control panel. You should leave the pulled wire in place, maybe tie it back so it has no chance of shorting any other wire.

Edit: OK, I figured out what you are asking. You do not need to combine the wires unless you really want to. If you look at any Jamma standard board the lands for 27 and 28 are connected together.
 
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