Galaga to Jamma

Seifer13

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I just bought a Galaga to Jamma adapter. I tried hooking up a galaga board to a jamma machine with it and got nothing. There is a female 5 pin connector on it that Im not sure what its for. Anyone know how to use the adapter?
 
If you bought the one I'm thinking you bought, it's probably missing the 3-pin power connector. Usually there are two connectors coming off of it - a 3-pin for power (you can make one and attach it to labeled holes on the adapter) and a 6-pin video output connector. These connectors plug into the Galaga board

I bought mine a while back from Arcadeshop (before I began making my own) and added the connector myself...

SDC11922.jpg

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images


This is what I have. It doesnt quite match up with the one in you picture. What do you think? THanks for the help
 
so they sell an adapter that doesn't work? Or is incomplete?

I dunno. I never tried it without the plug. I saw there wasn't one, added it, and my board ran just fine. Since Galaga doesn't run any 12v power through the main connector, and only some +5, the extra connector is necessary - at least to have sound. It goes to the CPU board, so I'm sure there is a reason it runs +5 there, too.

Either they aren't making it right (and don't know they are), or they make it this way and expect you to add the other connector.


aaron6918 said:
This is what I have. It doesnt quite match up with the one in you picture. What do you think? THanks for the help

I can't see it well enough to see if it has spots for +5, +12, and ground...
 
Okay, I did some research.

This is what you posted as having:

gallag-jamma-Adapter.jpg


This is a Gallag adapter, used for a Galaga bootleg board. It is not the adapter for a Galaga.

This is the one you should have:

galaga-jamma-Adapter.jpg


If you bought it from Arcadeshop, you should be able to return it for an exchange. They cost the same...
 
I dunno. I never tried it without the plug. I saw there wasn't one, added it, and my board ran just fine. Since Galaga doesn't run any 12v power through the main connector, and only some +5, the extra connector is necessary - at least to have sound. It goes to the CPU board, so I'm sure there is a reason it runs +5 there, too.

Wrong....

What the galaga harness does is completely irrelevant. What's connected on the board is all that matters.
 
So, the 12v that goes to the 3-plug connector isn't needed by the board to run in a JAMMA cab? Nor is that +5 input? I can understand the +5 on the edge connector being connected to the 3-pin molex, but why have +12 if you don't need it? That's not on the edge connector...
 
Who knows why it was designed that way... Maybe it was done after a few drinks ;)

My adapter board gets very warm after being used for an hour. That tells me the traces aren't stout enough for the current flowing through. When I finally buy the 3 pin connector, I'll put the wires directly on the JAMMA connector.
 
So, the 12v that goes to the 3-plug connector isn't needed by the board to run in a JAMMA cab? Nor is that +5 input? I can understand the +5 on the edge connector being connected to the 3-pin molex, but why have +12 if you don't need it? That's not on the edge connector...

+5 and +12 are both on the edge connector.
 
+5 and +12 are both on the edge connector.

Not that I doubt you (really!) but the pinout on crazykong and a perusal of the manual (page 77) both show that the v.audio (+12) comes out of the power supply and into the CPU via the 3-pin connector. It does not show +12 coming into the edge connector anywhere that I can see.

So, what am I missing?

Now, the 36-pin bootleg and the clone pinouts on Crazykong do show the +12 on the edge connector....
 
Not that I doubt you (really!) but the pinout on crazykong and a perusal of the manual (page 77) both show that the v.audio (+12) comes out of the power supply and into the CPU via the 3-pin connector. It does not show +12 coming into the edge connector anywhere that I can see.

So, what am I missing?

Whatever... believe whatever you want.
I'm through trying to educate you.

Why don't you ACTUALLY LOOK AT A PCB.
 
Whatever... believe whatever you want.
I'm through trying to educate you.

Why don't you ACTUALLY LOOK AT A PCB.

Aren't you the guy who told me RTFM a while back? It's apparent your title of "educator" is self-annointed, and not by profession. Education is not "because I said so". Teaching is explanation to comprehension. I asked for an explanation. All you had to say was, "The +12 pin on the 3-pin connector is also connected to Pin x of the edge connector, even though it isn't documented in the manual." And then you would be assuming his adapter is made with that in mind.

I'm not saying that +12 doesn't connect to the edge connector somewhere through the traces, just that the original Galaga cabinet didn't connect it there. And with your comments about the "anemic" traces of the AS board, it seems that it would BETTER to use the 3-pin connector, whether it was needed or not....
 
Aren't you the guy who told me RTFM a while back? It's apparent your title of "educator" is self-annointed, and not by profession. Education is not "because I said so". Teaching is explanation to comprehension.

If you can't comprehend how to perform an experiment to use your multimeter to trace continuity between the power connector pins and the edge connector, you're hopeless.
We're not talking about an abstract concept here, we're talking about a simple fact that you could have pulled out a PCB and verified, but you're happier posting blathering misinformation then trying to learn something on your own.

I asked for an explanation. All you had to say was, "The +12 pin on the 3-pin connector is also connected to Pin x of the edge connector, even though it isn't documented in the manual." And then you would be assuming his adapter is made with that in mind.

The adapter was made with that in mind, otherwise it would have to have the additional 3-pin power cable. My adapters were made with that in mind, and AS copied them, it follows that theirs were too. Sadly they can't even copy well, and made the power lines smaller than they should have been.
 
Well, you're right that I could have gone into my stacks and found a PCB and checked. I've never professed to be a circuit-design specialist, nor a game PCB repair specialist. Unless I have a reason to do a board repair, I rely on the manuals and schematics to tell me what experience so far hasn't. And I can comprehend just fine. I just didn't feel the need to do so tonight.

But considering your assessment of the quality of their copy, the 3-pin connector is still probably the best way to do it, regardless of whether it is needed or not. Hence, my original answer is still relevant, if not entirely necessary.

And it was immaterial anyway since he has the wrong adapter, other than for "educational" purrposes...
 
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