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ipac key jamming?

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Lactose:
At Quakecon this guy dragged a nice mame cabinet in and now I'm interested in building one. As I understand it he was using ipac to handle the input. A problem I noticed was that sometimes you would send button input without pressing a button. It seemed more frequent if the other player was holding multiple buttons down (for example Balrog's turn punch in SF2). Is this a common problem with ipac? Is there a way around this?

Thanks!

Tiger-Heli:
I don't think it's a common problem with the I-PAC.  It would be common with a matrix-based encoder, such as an older keyboard hack or a TOKN KB 16 encoder.

See http://www.mameworld.net/tigerheli/encoder/index.htm for a summary of your options.

SOAPboy:
You 100% sure it was a IPAC?

Im running an IPAC and we play alot of SF games on it.. and nobody ever has key jamming issues..

Lactose:
Yeah it was IPAC, it used the "hold player 1 start and press jab to get coins" mechanic and other telltale signs of ipac.

Test your machine: Try holding all 6 player 1 buttons and then moving the player 1 joystick randomly and see if player 2 is effected at all. See if all player 2's buttons and joystick directions respond properly.

88mph:
Another possibility is that whoever put the cab together has the buttons and keys poorly mapped.  If I were seeing problems like that with an IPAC (and I never have yet) I would probably try remapping some keys.. i.e. move away from keys like cntrl, shift, and function keys and use regular letter keys.  Windows in particular retains some pretty arcane keyboard combos that few people know about, so certain combinations of keypresses can cause odd things to happen.  My advice would be to remap..

-88mph 

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