(To preface this, I'm sick while typing this, so I might not be as coherent as I'd like to be. If that's the case I apologize.)
So as I stated in a post a while back I'm trying to consolize a couple of old JAMMA boards by making some Superguns which I can then install in a custom case (to make a proper console). For the most part everything works well (switches work just fine, the extra power LED works as it should, everything is powered on and functional) except for one thing, the video keeps 'rolling' so to speak. I'm fairly certain everything is wired up correctly (I've triple checked every connection/wire), but the problem persists.
The board itself works properly when checked against a store bought supergun so that can't be the issue. One thing that I did notice though is that the resistance (for the sync pin) on the home made one (150 ohm) is far less than on the store bought one (either 290 ohm or 390 ohm, not sure if the first color is red or orange) although I did keep to the schematics (see picture below). Could that be the issue, or is there something else I'm missing? I'd be very grateful to anyone who can help.
So as I stated in a post a while back I'm trying to consolize a couple of old JAMMA boards by making some Superguns which I can then install in a custom case (to make a proper console). For the most part everything works well (switches work just fine, the extra power LED works as it should, everything is powered on and functional) except for one thing, the video keeps 'rolling' so to speak. I'm fairly certain everything is wired up correctly (I've triple checked every connection/wire), but the problem persists.
The board itself works properly when checked against a store bought supergun so that can't be the issue. One thing that I did notice though is that the resistance (for the sync pin) on the home made one (150 ohm) is far less than on the store bought one (either 290 ohm or 390 ohm, not sure if the first color is red or orange) although I did keep to the schematics (see picture below). Could that be the issue, or is there something else I'm missing? I'd be very grateful to anyone who can help.
(the used schematics)
Last edited by nasune,