Jamma to Nibbler adapter

ScumBum

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I have a dedicated Nibbler and I want to keep it all original and play my MsPacman board in there . I have a MsPacman to Jamma adapter from arcadeshop , so I want to make a Jamma to Nibbler adapter . Is this possible ? Heres the pinouts , does it look like it should be an easy adapter to make . Never made an adapter before so any advice would be helpful .

http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=pinout&page=Nibbler.html

http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=pinout&page=Jamma.html
 
You can buy a JAMMA to Nibbler adapter (to play a Nibbler PCB in a JAMMA cab), and it only has jumper wires, no extra electronics, so going the opposite way should be no problem.
 
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I have one of those adapters from Mikes Arcade you can try if you want.
Just pay shipping.
If it works then you can have it for $20.00.
If not just send it back to me.
Pm me if you want me to send it to you.
 
Joey has a dedicated rockola nibbler and he is looking for a way to play 96 in 1 pac in it without hacking the wiring. He wants an adapter to convert his dedicated nibbler cabinet to jamma. Not to play a nibbler board in a jamma cabinet..

Your going to get stuck if your trying to go to true jamma as I don't think your rockola cabinet makes -5v(funky juke box power supply). But, I don't think your MS pac board needs the -5v, so if thats all you want to do, then maybe.

http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=pinout&page=Pac.html

So if you don't think you can make an adapter board for it yourself, you will need to find someone to build you one. I can't imagine anyone would have a premade one.
 
Thanks for the offer jimkirk , but like mrbill2084 explained , I want to build an adapter to make my dedicated Nibbler cab play a Jamma board without hacking anything .

Yeah I noticed theres no -5 , but it looks like Mspac doesn't need it and thats the only board I wanna play in there from time to time , and maybe some other 4-way joystick only games down the road .
 
I have a similar problem in my Gaplus cab. It doesn't have -5V either, although a cab adapter was available for it (so I didn't have to make my own). It plays a 48-in-1 just fine. I tested a Black Tiger board in it, and it had no sound (I assume due to the missing -5V). The sound worked when I tested it in another JAMMA cab.
 
You'll need one that has the 22/44 fingerboard (so it'll plug into your Nibbler harness), and a JAMMA edge connector on the other side. Then just solder jumper wires across it in the appropriate spots using the Nibbler pinout you linked to.
 
There's a couple ways you could do it. You could order the Adapter Starter Kit:
adaptkit.jpg

You would order it for 28/56, and trim the other side so it's 22/44, then solder the jumper wires across the gap accordingly.


The other thing you could do is order a 22/44 fingerboard precut:
precuts.jpg

and a JAMMA wiring harness, he sells 2 types:
Economy:
econjam.jpg

and Fully loaded:
jamharn.jpg


Then you would solder each wire to the appropriate place on the fingerboard. I'd probably go this route, then you could mount the JAMMA board pretty much anywhere in your Nibbler cab and not have to worry about the wires not reaching. Of course, the other way would cost less than half as much, but would be a little more work (twice as much soldering and wire stripping)
 
I like that second idea alot , with the Jamma harness ! I already placed my order though , Bob called it a "Reverse adaptor starter kit " .

Next adaptor I make will be with the harness .
 
Ah OK, I thought about a potential problem with the adapter kit of his, so hopefully the reverse one takes care of that (I'm sure Bob would have thought of it). You'd need to have the cabinet side of the adapter without the JAMMA key in pin 7, in case your machine uses that pin (the pin contact is notched out in the adapter kit for the key)
 
Ah OK, I thought about a potential problem with the adapter kit of his, so hopefully the reverse one takes care of that (I'm sure Bob would have thought of it). You'd need to have the cabinet side of the adapter without the JAMMA key in pin 7, in case your machine uses that pin (the pin contact is notched out in the adapter kit for the key)


Hopefully he did think of this. The notched pin seven is a Jamma specific thing, and would be more work for him if it is notched.
 
he probably thought of this already , he did call it a " reverse " adaptor . We'll see ,


Looking at the nibbler pinout , it doesn't look like it uses pin 7 ,
 
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he probably thought of this already , he did call it a " reverse " adaptor . We'll see ,

Looking at the nibbler pinout , it doesn't look like it uses pin 7 ,

Depends on which 6 pins you cut off on the fingerboard (assuming it's not already done for you). If you start at pin 1 from the edge, and cut the last 6, the only thing you'd be missing is reset. If you don't need the player 2 controls (which your machine wouldn't have anyway, unless it's a cocktail, although the edge connector/harness is probably wired for them...a friend of mines was. The player 2 wires just went to a molex plug that wasn't connected to anything), you could cut off 1 or 2 pins if the JAMMA key notch is there.
 
Depends on which 6 pins you cut off on the fingerboard (assuming it's not already done for you). If you start at pin 1 from the edge, and cut the last 6, the only thing you'd be missing is reset. If you don't need the player 2 controls (which your machine wouldn't have anyway, unless it's a cocktail, although the edge connector/harness is probably wired for them...a friend of mines was. The player 2 wires just went to a molex plug that wasn't connected to anything), you could cut off 1 or 2 pins if the JAMMA key notch is there.

Cool , thanks for the advice . The package from Bob comes tomorrow , we'll see how hes got this reverse adaptor set . I have faith Bob will keep his Master Jedi arcade status by already figuring this out ahead of time .
 
Heres the reverse adaptor I got . Bob got it right ,
 

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Glad to see it came correctly. I figured Bob would be on the ball. Now you just gotta solder about 40 jumpers :p
 
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