Are there different Jamma standards?

jp.jones

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Hi Gang,

I purchased the Mark Spaeth Cloak & Dagger to Jamma adapter and am now attempting to install it.

As you can see from the picture, the top board is the C&D adapter while the bottom is a standard Jamma PCB. The card edge is wider on the Jamma PCB and fits into the Jamma connector securely while the C&D adapter can shift from side to side. I'd hate to connect this and destroy my working board.

Is there a specific type of Jamma connector I need ? What am I doing wrong?
 

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JAMMA is the standard, if you deviate away from it, it's no longer JAMMA.

see/read: https://en.wikipedia.org/wiki/Japan_Amusement_Machine_and_Marketing_Association

Some JAMMA pcb's combine the +5vdc and ground pins (separately of course) and sometimes don't cut out the KEY (7th pin).

jammapin.gif
 
The C&D adapter is JAMMA. I have the same one. Some PCBs are just a little wider/narrower than others.

I bought a JAMMA harness from Twisted Quarter recently (which are known to be nice ones), and my Jrok PCB was a hair too wide to fit in it. I had to file a bit off of the ends of the Jrok board with a Dremel to get it to fit. You have the opposite problem.

As long as there isn't so much slop that you could short adjacent pins together, there's no problem. Just keep the connector as centered as possible.
 
Suppose I'll have to dremel off a chunk from a parted out PCB and superglue it to the C&D adapter to fill out that area. There's just too much play back and forth... I would assume if the cab is bumped, that it has a chance to shift.
 
Might be easier (and cleaner) to find a thicker piece of plastic or wood, and wedge it into the connector. Just a thought.

If you are going to glue something to the PCB, I'd use epoxy instead of superglue. Easier to work with, and more forgiving. You should give it a good few days to cure though. It 'sets' fast, but stays gummy for a few days, until it fully hardens up.
 
Suppose I'll have to dremel off a chunk from a parted out PCB and superglue it to the C&D adapter to fill out that area. There's just too much play back and forth... I would assume if the cab is bumped, that it has a chance to shift.
It is very hard to bump a cabinet hard enough to move the edge connecter.
 
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