Galaga/Gaplus cab question

CrazyKongFan

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I have a Gaplus cab and have a question about a couple of the plugs. There's a 6-pin and a 3-pin that plug into the board. The 6 pin is for the monitor (I've used it to test other PCB's), but I don't know what the 3-pin is for. I was hoping it was +5 and +12, but metering it, I can only get 5v reading. I have a JAMMA cab adapter they plug into (but that doesn't really matter for my question). Both plug into the adapter, but the adapter works on my 48-in-1 board without the 3-pin being plugged in. What is the 3-pin for? I'm including a pic of the adapter for reference (from jammaboards.com)
 

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Thanks, forgot about that page. That's where I got the pinout for the 6-pin plug so I could test the video on other PCB's :D (I've been hooking them up to a PC power supply). I used my tester on the PC power supply and got both 5v and 12v, but I tried the 3-pin one again and still only got 5v on both wires.
 
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