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JAMMA harness: identify these wires
dextercf:
--- Quote from: opt2not on November 23, 2011, 02:16:28 pm ---Trace the wires back the jamma connector, should all be self-explanatory. Take a look at this pinout:
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sorry for this off-topic derailing, but;
why is "G,H and I" not there on the JAMMA adapter?
briandoom:
you might be right BobA.
But this GND has these plug things on it... maybe there's a type of board or cabinet hardware that uses plugs for grounding.
My thinking overall is: this harness has been sold many, many times for this exact purpose.
So the bundles are specialized for something in particular, maybe even opt2not's Neo Geo machine.
This however may not be the configuration of my cabinet.
If I can avoid it, I don't want to eliminate something that could be useful.
dextercf, on my JAMMA pinout "H" is the key slot.
"I" and "O" are omitted as an industrial standard, because they look like "1" and "0"
It may be "G" is omitted so it doesn't get confused with "Ground"
opt2not;
I apologize if I sounded snarky! ;D
What part of my question is unclear?
Just so we're on the same page: I am new to this forum.
I am not new to electronics design or maintenance.
Current issues:
Q1: why are there two different COIN connectors, in two separate bundles?
Q2: why is P2 BUTTON 4 split into two contacts? Why is one of them very long and bundled with the speaker leads?
CheffoJeffo:
--- Quote from: briandoom on November 23, 2011, 06:19:00 pm ---dextercf, on my JAMMA pinout "H" is the key slot.
"I" and "O" are omitted as an industrial standard, because they look like "1" and "0"
It may be "G" is omitted so it doesn't get confused with "Ground"
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This.
--- Quote from: briandoom on November 23, 2011, 06:19:00 pm ---Current issues:
Q1: why are there two different COIN connectors, in two separate bundles?
Q2: why is P2 BUTTON 4 split into two contacts? Why is one of them very long and bundled with the speaker leads?
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I think perhaps you are looking too hard here ... what difference does it make why they are bundled this way ?
I presume that these were mass-manufactured to a spec, rather than some guy making concious decisions. There are probably two different coin connectors to account for differing cab designs -- including one where coins/bills are inserted from somewhere near the speakers. Same for the so-called Button 4 -- provides some flexibility in dealing with different games and cabinets.
Nothing to worry about.
BobA:
When I wired the exact same connector I cut off lots of wires that were not needed for a regular jamma installation. I think they try to make the wiring suit all configurations possible and alot of the extra grounds etc are not needed. Just take what you need and junk the rest.
emphatic:
--- Quote from: briandoom on November 23, 2011, 06:19:00 pm ---Q1: why are there two different COIN connectors, in two separate bundles?
Q2: why is P2 BUTTON 4 split into two contacts? Why is one of them very long and bundled with the speaker leads?
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Q1: Some games use more than one coin slot, one for each player. Your factory made harness might be made to accommodate this.
Q2: I had this in a cabinet I bought brand new from China as well and was curious about it. I did some searching for an answer and found that it's wired to support Non-JAMMA (95% JAMMA) NEO-GEO motherboards.
--- Quote from: www.hardmvs.com ---Q: What about the other boards?
A: The 2, 4, and 6 slot boards are wired to what I would call the MVS standard. It is almost the same as JAMMA, but have the additional 4th button, a select button, and Stereo sound out of the harness instead of an external connector. The test switch is also in a different location than the JAMMA test switch.
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^^Does this sound plausible?