ArcadeVGA + JPAC Problem

[tomdotcom]

Here's the deal: (ArcadeVGA graphics card version 1)

I went into the bios and disabled the onboard video. Then I plugged everything into the arcadevga card( v1)/jpac and now I can get windows to show up on the arcade monitor. However the screen is rolling and it's somewhat garbled but kinda legible. No lights on the jpac are lit at all. I tried to adjust the vertical hold and got it to a slow roll. Any idea what I need to do here?

The monitor is in a neogeo 4 slot arcade, model#19k7101(wells gardner), where do I need to put the little red jumpers. It has 15,25,and 31 and what do I need to do here to get it to work? Ideas?

Thx in advance.

[Kevin Mullins]

I tried to adjust the vertical hold and got it to a slow roll. Any idea what I need to do here?

Do you have it connected to the Negative Composite Sync input?
Is there a Horizontal frequency or 50/60Hz potentiometer to adjust?

The monitor is in a neogeo 4 slot arcade, model#ga63adg25x,

That's NOT the monitor model..... that's only the tube.

where do I need to put the little red jumpers. It has 15,25,and 31

NO idea what jumpers you are talking about...... but whatever it is it should be 15.

[tomdotcom]

There are 3 2pin jumpers on the jpac..one says 15, one is 25 and one is 31. Do I need to put the jumper on the 15 then? Or put 2 jumpers on the 25/31 instead?

I will try to adjust the horizontal or 50/60 see if that helps..

The picture is definitely still off even if I could stop the roll, it's almost like its kinda smeared in one direction, like it was blown by the wind..

How come there are no lights coming on for the jpac? Isn't the self test light susposed to light or blink? Then the sync ok is susposed to stay lit if everything is good?

Maybe I need to reinstall some drivers? I'm not sure how to remedy this as it's my first experience using mame with a real arcade monitor.

Thanks for helping!

[tomdotcom]

This is the neogeo it is going into:

MVS-4-25 (ver. 3) 25" monitor


I believe the monitor is a Wells Gardner 19k7101 25"

[shess]

I'm using a similar chassis in my machine.  The jumpers need to go on 15khz and 31khz on the J-Pac.  As far as the jamma harness to the chassis, I have the H/V sync cables on the negative sync part, the 3 pin section next to 6 pin part, but it might not matter with the J-pac.  Do you have the original MVS board or any other Jamma board to test the monitor sync?

Scott

[tomdotcom]

The monitor was 100 percent working as I took out the old board and the monitor worked perfect before.

The only cable I'm using is the jamma cable into the jpac.

Not sure what you mean by "I have the H/V sync cables on the negative sync part, the 3 pin section next to 6 pin part"

Man I hope this works!!

My first experience trying to get an arcade monitor working with mame!

[Kevin Mullins]

Not sure what you mean by "I have the H/V sync cables on the negative sync part, the 3 pin section next to 6 pin part"

He's referring to the part of the JAMMA harness that connects directly to the monitor.
You have a RED, GREEN, BLUE, GROUND and Negative Composite Sync wires coming off the JAMMA harness going to the monitor.
If you have altered that in any way on the monitor, then make sure the SYNC wire is going to the last pin on the monitor opposite the red, green, blue wires.

How come there are no lights coming on for the jpac? Isn't the self test light susposed to light or blink? Then the sync ok is susposed to stay lit if everything is good?

You are right, there should be some sort of light activity on the JPAC.
I'm not very familiar with them, but someone else had a similar problem not too long ago if I recall correctly. (no lights)

[tomdotcom]

I talked with Andy at ULTIMARC and think I may have it figured out. I'll have to test it when I get home tonight from work. What a great guy he is. I'm tempted to buy more stuff from him just because of the awesome support he provides!!

[SirPeale]

Sounds like you don't have either the PS/2 or the USB cable plugged in.

[boozy]

I have this issue as well.  What was your solution?!?

[Finchbyrd]

I was asking about this same issue when I took an initiative. I placed a jumper on the 15khz pegs on the J-Pac and that solved the rolling issue, it still rolled, but when I adjusted the v-hold it snapped into place firmly and I had to twist it about an 1/8 of a turn to get it to crawl rather than tap the arcade cabinet to send it rolling wildly. I'm happy with that, but I"m still having a J-Pac issue. The sync led's are lit, but the self test has yet to light. I need to see if switching the keyboard cable is the issue. Its not responding at all.

[Ummon]

The sync led's are lit, but the self test has yet to light. I need to see if switching the keyboard cable is the issue. Its not responding at all.

Does it light if you reboot? I've had that problem on one computer and I solved it by connecting USB with a PS/2-USB adapter (80 cents including shipping on ebay....although I already had two....oops).

[Finchbyrd]

No, it has never lit. I didn't receive any Jumpers, so I installed one on the 15khz pins and one on the 31khz pins, that has stopped my v-sync issue and screen roll, but still, nothing for my controls or self test. I has never lit, I watch it as I reboot, the sync lights turn on and off as they find their resolution, but the self test has never lit. I don't understand it, if I unplug the PS/2 cable all together the J-Pac doesn't work at all, no sync lights or any lights. If I have the PS/2 cable plugged, the sync lights work but the controls don't. It's as if the PS/2 cable works only for power and nothing else. I tried a PS/2 to USB adapter and had no luck.