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| Jpac / Jamma+ cabinet (Mortal Kombat) |
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| gsoul:
Okay, I've got a few questions regarding hooking up a J-Pac to a Jamma+ Mortal Kombat machine. My machine has Mortal Kombat 1,2,3 & 4 in it. Awesome, but I still want to play some classic arcade goodness. So I hook the J-pac into the jamma harness. The two sticks work along with the button 1 and the 1UP and 2UP buttons, as does the coin door. The remaining 5 on each side do not work. So what I'm not sure on is the whole grounding thing etc. So I figure that I add a wiring harness and solder it onto the existing wires (not the black ground) on the buttons, then wire the other end directly into the J-pac. What I'm unsure of is how to ground these buttons. They're already ground to the power supply in the cabinet, but I figure they need to be grounded to the J-pac. I'm a complete n00b with electronics, so any light you guys/gals could shed would be appreciated. Basically I dont want to intefere with the running of my super mk cabinet, so I remove the J-pac, plug in the UMK3 board and I'm off. Somewhere in hooking this up before, I blew the chip on the j-pac, thanks heaps to Andy for sending me a new chip. So now I figure I need some professional advice. Ideas? |
| gsoul:
C'mon, don't you guys know what I'm talking about? Am I on drugs? Whats going on here? Someone help me out please! |
| markrvp:
I do not have a J-pac, but from looking at the picture below, you should connect the button ground loop to the screw terminal marked: |
| gsoul:
So the buttons arent already grounded to the power supply of the arcade machine? |
| markrvp:
Don't you have a separate power supply for the computer connected to the Jpac? In either case, I would try grounding buttons 4-8 for both players to the GND on the Jpac and see if that works. |
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