More Act-Labs Lightgun / ArcadeVGA woes

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jerryjanis:
My Act Labs PC USB Light Gun worked on my WGK7191 monitor after I separated the hsync and vsync. I'm using an ArcadeVGA with a vga cable hack. I'm pretty sure that worked fine in Windows in 640x480 interlaced mode. I'm certain that 640x480 mode displays normally when the gun is plugged in.

When I plug in my lightgun, for some reason I typically don't plug the VGA cables tightly enough, and I get crazy screen weirdness until I turn it off and plug them in properly. Other than that, I haven't encountered anything like the problems you are talking about, so I'm sorry that I can't be much of a help.

jerryjanis:
It sounds to me like you've got the right idea with the wiring. Here is a picture of the wiring on mine:

http://jstookey.com/arcade/WG_25k7191/WG_25K7191_output.JPG

And here's a diagram that points out which wires are which:

http://jstookey.com/arcade/WG_25k7191/WG_25k7191_diagram.JPG

GamingGreg:
Okay, I've gotten things working a bit better. I found an old VGA cord off of an old dead monitor, and I hacked it into a cable for my monitor (with separate h and v syncs). Once I did this I bypassed the video amp with this cord. Then I was able to get both guns hooked up, without the screen "wigging out" on me. Thanks for all of your suggestions.

However, the guns still aren't working great. After calibrating the guns, I found that the cursor was moving quite far from where I was aiming, making it impossible to hit anything. It was almost a random point on the screen (not VERY accurate). Sometimes the mouse cursor would move consistentally to the far upper right of the screen, after calibrating (a failed calibration?).

Any ideas?

*Edit*
I should also mention I tried calibrating in 640x480 60Hz. I played around some with 640x288 & 640x240 with no luck as well, but I might not have had the refresh set properly on those. For some reason, every time I change resolutions using that tool that came on the Ultimarc CD, it sets the refresh rate to 200Hz. I don't know if that even matters as the ArcadeVGA limits this to 15Hz anyway from what I understand.

JoeB:

--- Quote from: jerryjanis on February 25, 2004, 08:11:03 pm ---It sounds to me like you've got the right idea with the wiring. Here is a picture of the wiring on mine:

http://jstookey.com/arcade/WG_25k7191/WG_25K7191_output.JPG

And here's a diagram that points out which wires are which:

http://jstookey.com/arcade/WG_25k7191/WG_25k7191_diagram.JPG

--- End quote ---

I have this exact monitor. When I got it, it had a CPS2 game inside of it, and I noticed that both the H & V synchs were connected together (same wire, looped twice) before it went to the JAMMA board.

Are we required to do this for the light gun, run just one of the wires, or run 2 seperate sync cables back to the J-PAC ???

GamingGreg:
It's been determined (by Andy and others) that the act-labs VGA lightguns need a separated sync to work right. Since the Jamma standard calls for a composite sync, I don't think you're going to get a lightgun working with a J-Pac. There might be a way to modify the J-Pac to do this, but I doubt it. You might want to ask Andy about that.

Also you could bypass the J-Pac with your own VGA hack, but you'll need to insure your card (if not an ArcadeVGA) is outputing 15Hz refresh rate or you could burn the monitor out. (see the monitors section of the website for more details)

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