Build Your Own Arcade Controls Forum
Main => Main Forum => Topic started by: RayB on July 19, 2005, 01:25:46 pm
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OK back to Noob-land for me... I am finally getting around to assembling the parts I've had for well over a year. My original intention was to make it a JAMMA cabinet with a JPAC. The thing is, every time I read a noobie post regarding JAMMA cabs, people invariably suggest to "strip it of everything". Strike 1.
Next issue is that you need to disable the switching power supply since a JPAC doesn't use it. Strike 2.
JAMMA standard is mono sound. We need to bypass it to use stereo sound. Strike 3.
My question to all of you who bothered to keep a JAMMA set-up with a JPAC: Do you EVER end up using real JAMMA boards in that MAME cab?? (Possibly strike 4!)
Overall it sounds like alot of redundant stuff just to keep the JAMMA standard parts in there. Is it worth it or not? I have ripped EVERYTHING out because the wiring job in there was just horrible, but I do have all the new parts necessary to re-wire everything to JAMMA standards. Should I bother?
~Ray B.
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If you want to have an original pcb in there then yes. Otherwise it isn't needed.
however, what getting a jpac saves you is having to rewire the controls. They are already wired into a jamma harness.
BTW, jpac works with multijamma.
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I thought the whole point was to not have to rewire and to just go from the computer to the existing JAMMA setup. I just wired a JAMMA cab for the first time and it was a way bigger pain in the ass than wiring a keywiz. If I had everything stripped there's no way I would mess with JAMMA if I didn't want the cabinet for JAMMA boards.
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The thing is, every time I read a noobie post regarding JAMMA cabs, people invariably suggest to "strip it of everything". Strike 1.
Maybe I'm the exception, but I usually favor a minimalist approach to modification, and don't usually suggest stripping much of anything.
Next issue is that you need to disable the switching power supply since a JPAC doesn't use it. Strike 2.
Depends on the power supply, and what else is connected to it. I didn't disable the one in my candy cab and it doesn't seem to have hurt it. Some supplies, as I understand it, you have to keep at least a little load on to keep it from being damaged. Even if you do disconnect it, it's only one or two quick screw connections from being hooked back up.
JAMMA standard is mono sound. We need to bypass it to use stereo sound. Strike 3.
If you're wiring the cab yourself, you can set this up with a toggle switch to switch between stereo and mono...
My question to all of you who bothered to keep a JAMMA set-up with a JPAC: Do you EVER end up using real JAMMA boards in that MAME cab?? (Possibly strike 4!)
Ah, now there's the real question... I haven't yet, but would like to keep the option open. If you don't think you ever will, don't bother with it. If you suspect you will, or only have room for one cabinet (so couldn't just bring in a second, JAMMA cab), then go ahead and wire for JAMMA. It's a question of likelyhood of use versus the little extra effort you have to put forth to hook it up that way.
Overall it sounds like alot of redundant stuff just to keep the JAMMA standard parts in there. Is it worth it or not? I have ripped EVERYTHING out because the wiring job in there was just horrible, but I do have all the new parts necessary to re-wire everything to JAMMA standards. Should I bother?
If you've already got the stuff to do it, I probably would, unless you're absolutely sure you'll never want to use it for JAMMA. The extra work is a one time thing, and it adds a potential to do more things that the cab that it wouldn't otherwise have.
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JAMMA standard is mono sound. We need to bypass it to use stereo sound. Strike 3.
Jamma standard was changed to STEREO in the early 1990's.
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Jamma standard was changed to STEREO in the early 1990's.
That would certainly explain why QSound is so good (at least to my ears).
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Jamma standard was changed to STEREO in the early 1990's.
Not that I'm doubting you or anything, I know you are a regular fountain of knowledge, but can you show me a spec somewhere that shows stereo JAMMA?
The closest thing I've ever seen is the Neo-Geo flavor of JAMMA which *does* support stereo.
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Jamma audio standards:
If mono cabinet, pin "L" is speaker -, Pin "10" is speaker +
If stereo cabinet, Pin "L" is left speaker -, Pin "10" is left speaker +, Pin "M" is right speaker -, Pin "11" is right speaker +
These standards are listed on the A.M.O.A. website (www.amoa.com) but their site is currently down.
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j-pac does only allow 15Khz video signal through and has an amplifier ...
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NeoGeo does stereo like this
http://www.homearcade.org/BBBB/mvsjam.html
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Next issue is that you need to disable the switching power supply since a JPAC doesn't use it. Strike 2.
Really, will it hurt anything to leave the switcher hooked up?
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Next issue is that you need to disable the switching power supply since a JPAC doesn't use it. Strike 2.
Really, will it hurt anything to leave the switcher hooked up?
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While I have chosen to run multiple JAMMA boards (and a MAME machine) in the same cabinet using Clay's MultiJamma kit, I saw a machine yesterday (at b1bug's for those that frequent CGCC) that put a new spin on JAMMA/MAME combinations.
The machine looks like a standard 4-player Midway cab ... the spin is that the "inner" 2 control sets are attached to a MAME machine and the "outer" two control sets connect to the JAMMA harness. It didn't occur to me to ask how he switches the monitor between JAMMA and MAME connections.
I thought it was an interesting way of having JAMMA/MAME in the same cabinet.
Cheers.