Ok so I played with my X-men board some more and I'm finally getting somewhere.
The post I found online said the pinout for the second RGB connector was
1 R
2 G
3 B
4 Gnd
5 sync?
6 +5
I tried that and got no signal, but the encoder board got power (JROK and NeoBitz).
So I went poking around the net to try and learn how arcade monitors are set up and the schematics I found seem to indicate the monitor takes H and V sync separately. Also the 6-pin header reminded me of a video extension cable I saw here: http://arcadecontrols.com/BBBB/rgbcable.html
I thought maybe this secondary output is putting out the H and V sync separately. So I went poking around the net some more and I found one schematic that showed a way to combine the different syncs into a composite sync (http://www.tkk.fi/Misc/Electronics/circuits/vga2rgbs.html).
Well I haven't tried that but I did decide to just try combining the H and V sync wires into the Sync In of the encoder boards, and I got a signal! The JROK handles it pretty well, but the NeoBitz has wierd colors and the picture blinks in and out and is sort of scrambled. I think it's just because of the different encoding chips used. I was happy I was getting a signal at all!
I thought I read somewhere a singal sync input can determine which signal is which, but I forget where I read that...maybe that's just how the composite sync works.
I also think the reason the boards got power is because the H-sync is at 5 volts. A website I came across seemed to indicate that.
Is it a good idea to combine the syncs like that?
And just how does a JAMMA harness hook up to a monitor? The harness seems to put out a single sync, but the monitors appear to take two separate sync inputs. There must be something I'm missing.
The post I found online said the pinout for the second RGB connector was
1 R
2 G
3 B
4 Gnd
5 sync?
6 +5
I tried that and got no signal, but the encoder board got power (JROK and NeoBitz).
So I went poking around the net to try and learn how arcade monitors are set up and the schematics I found seem to indicate the monitor takes H and V sync separately. Also the 6-pin header reminded me of a video extension cable I saw here: http://arcadecontrols.com/BBBB/rgbcable.html
I thought maybe this secondary output is putting out the H and V sync separately. So I went poking around the net some more and I found one schematic that showed a way to combine the different syncs into a composite sync (http://www.tkk.fi/Misc/Electronics/circuits/vga2rgbs.html).
Well I haven't tried that but I did decide to just try combining the H and V sync wires into the Sync In of the encoder boards, and I got a signal! The JROK handles it pretty well, but the NeoBitz has wierd colors and the picture blinks in and out and is sort of scrambled. I think it's just because of the different encoding chips used. I was happy I was getting a signal at all!
I thought I read somewhere a singal sync input can determine which signal is which, but I forget where I read that...maybe that's just how the composite sync works.
I also think the reason the boards got power is because the H-sync is at 5 volts. A website I came across seemed to indicate that.
Is it a good idea to combine the syncs like that?
And just how does a JAMMA harness hook up to a monitor? The harness seems to put out a single sync, but the monitors appear to take two separate sync inputs. There must be something I'm missing.