GunCon2 on PC-monitor

[Silver]

No, this thread is (or was) all about using the guncon2's on PC monitors - i.e. 31Khz or higher horizontal scan rates. (hence jpacs and circuits to cut this down to standard TV 15Khz).

If you are using a TV as a display you should not have any significant problems....

[lettuce]

Ok cool, so on the end of the GunCon2 you have the USB plug and a yellow phone plug that used to plug into the back of the PS2, where does the yellow phono plug plug into?

[Silver]

Ok cool, so on the end of the GunCon2 you have the USB plug and a yellow phone plug that used to plug into the back of the PS2, where does the yellow phono plug plug into?

Thats the TV-out signal. So you take the composite TV-out from the gfx card, to the guncon2 yellow phono (which is a pass-through connector) and then from the gun to the TV's video in.

If you are using S-video or Component, then you need to split off the syncs to the gun and then on to the TV (e.g. in component, the 'green' would have to go via the gun.)

[lettuce]

Ah, im using a VGA to Scart lead to connect my video card up to my TV, as im in the UK. How would that work?

[Silver]

How are you knocking the signal down to 15Khz?

I assume you are using an RGB signal down the scart. Scart connectors can carry seperate syncs, as well as composite sync, as well as sync-on-green. What you are using depends on your gfx card/software setup.

[ZeroPoint]

Since you are using the ArcadeVGA card, it already outputs 15Khz sync signal. What I don't know is how your VGA to Scart cable is buildt. The gfx-card outputs 5 volts on the h and v sync so there must be at least one resistor there to get the voltage down (since the scart has 75 ohm impedance this can be done). In your cable there must also be some circuit to combine the h and v sync to composite sync. Many ways to Rome. Connecting them together (and a resistor) could be done since you are using the ArcadeVGA card that outputs both h and v sync negative. Another way is to use diodes. The best and most reliable way is to use an xor gate that outputs negative composite sync no matter what polarity you put into it.

Anyway, since you are already using a vga to scart cable that works it must produce a composite sync signal some way or the other. All you need to do to connect you GunCon's yellow plug to your composite sync (center) and ground pin on your scart plug. I don't rembember at the moment which pin number this is, just that you should use the same pins that comes from the gfx-card (after the sync combine circuit) via the cable (sync ones) and not the output pins on the scart plug. (There are both input and output pins.) The impedance in the gun is so high that it won't steal any voltage. But if you cable uses a resistor to drop the voltage, disconnecting the scart plug from the TV would result in feeding the gun with 5V. I think it can handle that, but don blame me if it doesn't.  Split a phono extension cord and connect that so you won't have to cut you GunCon's cable.

Just remember that different resolutions (refresh rates etc.) may need different calibration. Try sticking to one res for guncon games. It should work great if you can handle the calibration routine.

[lettuce]

Im trying to remember what i did in order to get the scart cable to work with my TV. I think i soldered a wire between the V & H sync pins, and that game me a picture

[lettuce]

Ok, im a bit lost at what i need to do regarding my VGA to Scart lead. Heres a pic of the inside of the scart socket



What pins would i have to solder extar wires to that would go to the yellow phobo plug of the GunCon2?

[ZeroPoint]

Connect the center to the burgundy wire (pin 20 - upper left) and ground to the black wire (pin 17 - 2nd lower left). This is "composite sync" and "composite sync return / ground"

It looks like this is the kind of cable that connects the sync (pin 13 on the vga plug) directly to pin 20 on the scart. This is not the correct way to connect to a scart. It may work or not with this cable. The pinout should be correct I hope. 

[lettuce]

So are you saying this scart lead is wired incorrectly??