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GunCon2 on PC-monitor

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Silver:

Sounds odd.... I take it the gun is detected ok by the drivers? (You have a guncon listed in device manager?).

Is your VGA splitter powered? I've never used one, and its possible that there is something it is doing that does not work with the gun. I've only tested (with the old chip) where I've directly pulled the syncs from the VGA cable, or used a direct pass through of the syncs on a monitor.

olsteve:

 Yes the drivers know the gun is there. The VGA splitter is just a 'Y' cable that has two outputs from the pc (no power).
 I will attach a pic of the circuit that I added some clarification to. Let me know if it is correct.


Silver:

I can't remember the exact pinout of a VGA but I'm sure you've checked the pinout.

I assume you've connected the -ve end of the Capacitor on the right to the other grounds on the left. Not sure if you need to ground the vsync input or not.

I came across some issues (with the old chip) regarding sync polarity and termination. The old chip needed -ve syncs, not sure about the new one. Try a couple of different resolutions, most VGA cards seem to change sync polarity at different resolutions, or use powerstrip to ensure what you are outputting (or if you have a radeon, you get set the syncs in display properties).

For termination issues, add an rca cable to the the gun rca connecter (they are always dual connectors, so plug in your rca connector from the circuit in one, and then connect the other to another cable. For a quick test you can then stick this cable in a tv - you should be alble to notice a stable black picture (I know its sounds dumb, but there is normally a difference between nothing connected on a tv and a black signal.) This will both ensure you have good syncs on the RCA, and at the same time will terminate the composite sync signal.

EDIT: I believe I've noticed an error in your wiring. I believe sync ground is actually pin 10, whereas you seem to have hooked up pin 5. I know some VGA pinouts just list pins 5-6-7-8-10 as ground but actually 5 was the old TTL groun, 6 is RED ground, 7 blue ground, 8 green ground. Try hooking up pin 10 instead. You have 13 and 14 correct for the syncs.

olsteve:

 I believe the new chip is supposed to cure the sync polarity issue.
 Yes, the cap is tied to all the other grounds.
 What is the powerstrip thingy that you are refering to? 
 I did ohm out the grounds on the VGA connector and they all seemed to be tied together (5-6-7-8-10). I will double check when I get home (I am at work now).

Silver:

Powerstrip is a windows program giving you hardware level control over most graphics cards - modifying and creating custom resolutions down to the size of the front porch... Its fiddly to use though. However, if the new chip gets around sync polarity, then you will not need it.

The grounds maybe tied together - I just assumed they would not be (why else have seperate pins for all the grounds).

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