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Has anyone out there built a mame cabinet and also wired it for jamma?
OSCAR:
It's possible, but there are a couple things to be aware of before you go too far...
1st - The Opti-PAC and I-PAC4 are designed to connect to a PC, not a J-PAC. You may be able to piggy-back the I-PAC4 to the J-PAC, but the Opti-PAC will not interface to the J-PAC at all.
2nd- Optical devices are not supported by the JAMMA standard. Not really a big deal, but don't expect to have a trackball and/or spinner connected to a Opti-PAC and then be able to be plug-n-play with JAMMMA+ boards without making some custom wiring harnesses.
Overall your plan is right on and many people have done this. I have a JAMMA cab right now that I alternate between JAMMA boards and MAME pc w/ J-PAC. It's the optical controls that get a little sniggly, but it's not like there are tons of JAMMA+ games w/ optical controls anyway. You might as well just use MAME for those games instead of play them with the real hardware if you can.