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HornheaDD

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I have a Neo Candy 25 arcade cabinet which has it's harness wired as an MVS. I have a BigRed adapter from JAMMANationX so I can connect other JAMMA boards if I wanted to but I am wondering - is there a simple (read: novice) solution to have more than one JAMMA harness set up?

Here's my situation, I'm trying to figure out how to connect a board that is essentially CHAMMA. It's a Dreamcast MGCD. I've tried a ton of stuff to try and get this to work. I've tried soldering an edge connector and fingerboard to create some sort of adapter. Evidently pins 27/28 are what cause the MGCD to not register any control panel inputs. I've read here and there about lifting the pins, bridging a line from 27/28 to A1 and B2, I've tried bridging the ground lines in the harness to A1/B2, and nothing seems to work.

I'm just trying to see if there's any other way I can try to get this to work until I truly lose interest and sell the thing. I was able to get a 'custom' harness built by someone that will allow the controls to work, but it's a complete harness replacement. I don't want to replace my Neo25 harness. I want to leave the cab as stock as possible other than my added kick buttons. Would it be possible to maybe solder all of the leads on this extra harness to a finger board, thus creating an extension? That way if I want to play my MVS board I just plug that in, and if I want this MGCD, I plug the "MGCD harness" into my main edge connector?

Does that make any sense?
 
Three things to get, make that 4 things:
  1. An edge card of your choosing; common available brands below
    1. Sullins
    2. EDAC <---Digikey linked
    3. Hirose
    4. Cheap Chinese brand
  2. A JAMMA fingerboard
  3. Some jumper wire
And the ability to think through your unique scenario to solve the task at hand. You'll wind up with something like this.
 
Would it be possible to maybe solder all of the leads on this extra harness to a finger board, thus creating an extension?

Sure, of course. It's just wiring. It doesn't care where it terminates to.
 
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