Multi JAMMA set up...

Is it possible to have 2 JAMMA harnesses (p1/p2, and A/V wires only, not power) be connected in parallel to a SG (or cab) without damaging the PCBs?

If you have no power to the pcbs, how do you expect them to get their power? If you want tohave more than one jamma connection however, I would not reccomend the splitter floating around on ebay... go to wtf... ok... the site isn't working for me right now... anyways... the multijamma site at least WAS www.multigame.com . If they have their site down for maintenence or whatever, you may see it... I hope it didn't go out of business... I was hoping to buy one soon...

stuffmonger said:

If you have no power to the pcbs, how do you expect them to get their power? If you want tohave more than one jamma connection however, I would not reccomend the splitter floating around on ebay... go to wtf... ok... the site isn't working for me right now... anyways... the multijamma site at least WAS www.multigame.com . If they have their site down for maintenence or whatever, you may see it... I hope it didn't go out of business... I was hoping to buy one soon...

Click to expand...

That device requires ALOT of power to run, not practical for me.

I want to hook up 2 JAMMA PCBs, but their power will be switched between them using a on-off-on 2p/2t switch.

Thus what I am asking is if the other connections can be connected in parallel (AV and P1/P2 controls). If the answer is no, then all I would have to do is make switches between them.

oh... ok then... hows about this then (this is the simplest design I can think of right now): Get two power supplies, and put a switch in the power line before the supplies themselves... then you could use the dpdt switch to send the power to the power supply, and not to the pcbs themselves, so theres no current going to non-operational boards... about the harness for the jamma connectors... make your own, as I'm almost positive that you won't find someone to sell you one cheaply. Here's a link to the connector... http://shop.jammaboards.com/view_product.php?product=EC-56
Other than a buttload of wires, and a good amount of solder, you shouldn't need anything else. I don't think that you'll have any problems if you do it this way (but test with some cheap pcbs just in case).

I see no reason why a multi way-multi pole switch, to switch the rgb and syncs and relays for the 5 and 12 volts to several boards, the sticks and switches can be common. I havent tried it, but the only problem I see is the lower impeadance of several inputs in parallel acting as a low input on the working board- the switching input buffers should prevent this to a certain degree.

Not talking half a doz boards here but two or three perhaps. You should be able to run a couple of boards without the relay switching for the supply rails if your using a 15A arcade psu.

I will get around to testing this when I get some time and inclination.
I dont see how this approach could damage a board.

ttooddddyy said:

I see no reason why a multi way-multi pole switch, to switch the rgb and syncs and relays for the 5 and 12 volts to several boards, the sticks and switches can be common. I havent tried it, but the only problem I see is the lower impeadance of several inputs in parallel acting as a low input on the working board- the switching input buffers should prevent this to a certain degree.

Not talking half a doz boards here but two or three perhaps. You should be able to run a couple of boards without the relay switching for the supply rails if your using a 15A arcade psu.

I will get around to testing this when I get some time and inclination.
I dont see how this approach could damage a board.

Click to expand...

Thanks.