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J-Pac / I-Pac
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chris2922:
Could someone please explain to me what the difference is between the J-Pac and the I-Pac.  I was going to buy a J-Pac and an ArcadeVGA to interface my JAMMA cab to a bare bones Pc.  Before I do though, id like to know what the difference is.
SirPeale:
They're both the same for inputs.  The J-PAC has the added functionality of being able to plug directly into a JAMMA harness.  It amplifies the video signal to a level the monitor can use. 
krick:
The J-PAC also has a video circuit that divides a 31KHz VGA signal so that it cannot damage your arcade monitor if you accidentally send it a VGA signal.

This is most useful for people running DOS cabs with AdvanceMAME and a "normal" (non ArcadeVGA) video card.

When booting with a normal video card, there is a brief period during the BIOS display where a 31KHz signal comes out of the card.  Then when AdvanceMAME loads, it reprograms the card to display a 15KHz signal.


Since my cabinet was already wired for JAMMA, I went with a J-PAC and an ArcadeVGA.  I also picked up an additional I-PAC2 so I could hook up the player 3 & 4 controls, and an Opti-PAC for the trackballs and spinners.
chris2922:
Great, sounds good.  I'll get on and order them then.  Thanks both.
paigeoliver:
Since I first used the Jpac I now reccomend them for everyone, not just people using arcade monitors. Wiring is simple and easy with a JAMMA harness. Not to mention a lot less fragile. Plus the J-Pac makes swappable panels a breeze.

If you have a J-Pac and a Bob Roberts JAMMA harness then you won't even have to THINK, as every wire will be labeled for you.
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