Newbie needs help with dual jamma board in a Neo Geo cabinet.

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Newbie needs help with dual jamma board in a Neo Geo cabinet.

(This is my first post on this forum, so please tell me if I don't follow guidelines for posting here)

I am the proud new owner of a Neo Geo Cabinet (picture).

It came without the original 4-slot MVS.
Instead it had a dual Jamma plug (picture).

As you can see, there's already a harness going from a game to connection 1 (left side).
The wires from the bottom goes to the cabinet.

Now I want to connect another game to connection 2 (right side), and this is probably are very simple question:
The dual Jamma plug has a male connection as so does the Jamma game boards. What is the easiest way to connect them?

(Bonus question: AFAIK, the multi-slot MVSs have a slightly different pinout than the 1-slot and the Jamma, since Neo Geo cabinets have stereo sound. The guy that sold me the cabinet had consolized the original 4-slot MVS and had instead a 1-slot MVS connected to the dual Jamma board. He told me that without modification I can just connect Jamma boards or 1-slot MVSs or multi-slot MVS with the same harness. Can that be true?)
 
I would say that, yes, you could plug any other jamma or mvs 1 slot into that jamma connector, and you'd be fine.

The 2/4/6 slot mvs boards are not strictly jamma compliant, but they are close. You can buy/make an adapter that'll covert from mvs to jamma, with an additional pinout for the stereo sound if you had a jamma cabinet with stereo.

Also keep in mind that only the MV1 and MV1F (i think) are stereo.

If you wanted a 2/4/6 slot in there, I'd remove that jamma switcher, and just plug the multi slot mvs board (via adapter) into the jamma harness directly. Unless you wanted to switch between the mvs and some other jamma game.

Otherwise, I suppose you could get a mvs multi cart to go into your 1 slot.

Also, you'll still have to make a jamma extender cable, or some kind of female/female adapter to connect between the second jamma board and that switcher.
 
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I would say that, yes, you could plug any other jamma or mvs 1 slot into that jamma connector, and you'd be fine.

The 2/4/6 slot mvs boards are not strictly jamma compliant, but they are close. You can buy/make an adapter that'll covert from mvs to jamma, with an additional pinout for the stereo sound if you had a jamma cabinet with stereo.

Also keep in mind that only the MV1 and MV1F (i think) are stereo.

If you wanted a 2/4/6 slot in there, I'd remove that jamma switcher, and just plug the multi slot mvs board (via adapter) into the jamma harness directly. Unless you wanted to switch between the mvs and some other jamma game.

Otherwise, I suppose you could get a mvs multi cart to go into your 1 slot.

Also, you'll still have to make a jamma extender cable, or some kind of female/female adapter to connect between the second jamma board and that switcher.

Thanks a lot for your reply!
I've investigated matters further, and I think that the cable going from the cabinet to the dual plug is actually wired for a multi slot mvs. And the cable going from the dual plug to the jamma game board is without any adapters.

I will have to look further into the matter, but it seems like your suggestion of dropping the use of the dual plug is the best way to go (at least until I get more confident fiddling around with the connections).
And if I want to play Jamma game boards, I can get something like this: http://www.jammaboards.com/store/jamma-pcb-to-neogeo-mvs-cabinet-adapter-jamma2mvs.html
 
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