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P360 / JPAC / 5v and Ground question...
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Stobe:
I've seen similar questions asked before, but not this one specifically...

If the JPAC gets its power (and I assume  ground) from the PC's keyboard port, would it be ok to use the +5V and Ground from one of the PC's drive cables?  Or does the ground for the P360's have to be coming from the actual JPAC terminal strip?

I've seen the diagram for the JPAC on how to get the +5V from the LED harness, but I'd rather use a drive cable, since I'm already using a 4pin molex on my CP for quick disconnecting of the power to the P360's.

Thanks,
Stobe
krick:
The J-PAC doesn't supply ANY power over the JAMMA harness.

However, if you're handy with a soldering iron, know your way around the JAMMA standard, and are willing to risk voiding your warranty, you can modify the J-PAC to feed an external 5V/12V power source over one (or possibly more) of the JAMMA harness wires...

http://mame.3feetunder.com/jpacmod/

However, for powering a P360, I'd just tap the power directly from one of your power supply molex connectors as you've suggested doing.
Stobe:
ok, but what I was mostly concerned about was creating a potential difference (or ground loop).  Can I use both the +5 and the ground from the PC's power molex?  Or do I use the ground from the jpac?  I'm guessing they are the same, but I just want to make sure.

-Stobe
Havok:
They're the same - the encoder connects to the pc, which pulls it's ground from the power supply. So, anywhere there's a ground (power supply or encoder) - you can use it...
Stobe:
That's what I figured, but I never saw it explicity stated, so I wanted to be sure.

Of course, that didn't stop me from wiring it up last night and testing it out anyhow. :)

Everything worked, and no smoke.

Thanks,
Stobe
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