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I need NBA Jam/JAMMA tech info
BobA:
Just to simplify the explaination a bit. If you look at the info that Oscar provided the power supply is connected to the JAMMA connector at points 1 to 6 and A to F. These power wires are coded on a typical JAMMA harness but you cannot always depend on the color coding so verify the wires and pins.
In the drawing provided by Birdtales these wires are 1-6 on each side designated component and circuit sides. It is the JAMMA standard and shows -5V whereas Oscar does not. The info provided by Oscar is specific for NBA jam.
So your question about the yellow and black wire makes sense. The -5V is not required for NBA jam and has probably not been connected to the JAMMA harness. You might need it for other boards however. There are usually alot of black wires connected to the jamma connector and all are usually GND.
Sorry to be really long winded but was sort of figuring it out in my own mind as I answered.
BobA
Distortion:
MJ, I've got no problem connecting the harness to the board, right now I'm just worried about the power supply, but thanks anyway.
BobA, thanks for the input, and I've got one more question, and if anyone can verify this info, I'd appreciate that as well. What about +5v? Do I need to have a +5 coming in, or does NBA Jam use it? I know none of the controls are optical, so there is no need for it there, but would I need it for something else? I didn't see any red wiring coming from the power supply. I think it's actually the original Nintendo power supply, so it's likely to be quite old. I'm considering swapping out the old one for a PC power supply and maybe just putting some fuses in the line to prevent anything from getting out of hand.
Oh, and what games would use -5v? And if you're using optical controls, would it come into the jamma harness then out the board or harness, or straight from the power supply? (just for future reference)
BobA:
All jamma boards use +5V. Not sure what percentage use -5V but to make your jamma connector universal it should be connected.
If it is a converted cab then you may not see red wiring for +5V but is is definately there for the nba jam.
BobA
Distortion:
jeez, the more i look at this thing the more i realize how poorly it was converted....at the base of the power cables, the cables are actually all black, then they both connect (twist on of course ???) to yellow cables then one goes back to another black cable. I'm gonna have to swap out the power supply and do some shink tubing stuff. I can get PC power supplies cheap at work (best buy) so should I do that or try to figure out what the hell is going on with the old one?
What gauge of wiring should I use to connect the -5v since there's nothing there at the moment? The old ones look like they're probably around 20 gauge.
BobA:
The 20 guage should be fine. -5V has a very low current requirement.
You can use a PC power supply but care should be taken because some cannot be used without some load. Newer supplies will also require a turn on signal.
A better alternative is a video arcade game type powersupply which you can get off eBay or an arcade supplier and is very easy to wire because of the screw terminals.
An example of this type of supply is shown below. I have gotten them for as little as $10.
BobA