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Some general quesitons about first MAME cabinet setup
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Umgar:
Playing with knobs (mostly vertical hold) I have been able to get things a lot better. However, I'm still having a problem with vertical "roll." I can sometimes get it to stop but the dial is extremely sensitive. There is a miniscule "sweet spot" on the dial where the picture stays in place, anything above or below and the picture will start slowly scrolling up or down. Also, certain types of animation will make the picture jump up an inch or so or start to slowly roll. For instance, in the Nokia monitor test program if I cycle through some of the tests (the ones that have "flicker/strobe" effect), it will start to slowly scroll. Is this something that I can fix with more dial fiddling or is this indicative of a hardware issue? Maybe there is a software fix? There weren't any issues with vertical alignment when I was testing with the MKII board, only now that I'm using a PC.  ???

EDIT: More info that might be helpful:

 - No LED's are lit on the JPAC (occasionally I see self-test light come on but nothing else, I thought the "sync OK" LED should be lit?)
 - Strangely, changing jumpers on the JPAC seems to have no discernible impact on the picture whatsoever... have it set back to default two jumpers at 31 and 15 currently
 - Sometimes cycling the monitor (power down for 5 - 10 seconds, power back up) seems to help, sometimes not. Seems random

My issue seems very similar to this guy's problem: http://forum.arcadecontrols.com/index.php?topic=101088.0  He has a completely different display but also is using an ArcadeVGA + JPAC.

This, coupled with the fact that there were no issues with vertical alignment or scrolling on the monitor before I removed the MKII board and went to PC, has me thinking this has something to do with the ArcadeVGA and/or JPAC... any ideas?  :banghead:

ANOTHER EDIT:  Apparently the other guy who had this same issue it turned out to be a defective VGA Breakout cable. Could that be the case here? And a related question - anyone know if you can get this type of cable at a computer parts store like a Fry's Electronics or is this something I'll have to order online? I'm dumb, I am not using a VGA breakout but a regular VGA cable (the one that came with the JPAC). Could it still be related? I noticed that the VGA cable that came with the JPAC had one less pin than a standard VGA cable like I use with computer monitors, but I'm assuming that's normal?  ???
Umgar:
Unless anyone has a good reason why I shouldn't, I think I am going to buy a new VGA male-to-female cable and try that out tomorrow. It is such a cheap replacement I might as well rule that out before going down the path of more drastic changes like new caps for the monitor, new JPAC, etc.

*fingers crossed*
DillonFoulds:
There's a pin missing on the second row for a reason. It's just a keying pin, nothing in particular. No signals get sent through that pin.
CheffoJeffo:

--- Quote from: cotmm68030 on September 03, 2010, 08:37:58 am ---
--- Quote from: CheffoJeffo on September 03, 2010, 06:25:02 am ---
--- Quote from: cotmm68030 on September 03, 2010, 06:05:49 am ---Have you tried bypassing the JPac for the VGA? It's not required since the ArcadeVGA is already producing 15kHz.

--- End quote ---

The JPac isn't a scan converter and should not be bypassed.  :dizzy:

--- End quote ---

Then I must be thoroughly confused as to what the JPAC actually does for the video signal.  :(

Disregard me, I suppose.

--- End quote ---

Well, I was harsh (and potentially misleading) in my answer ... 'should not' was the wrong word choice. People often think that the ArcadeVGA and JPAC combination are redundant, but they do two totally different things (e.g. the JPAC won't change the scan rate -- if it gets 15kHz, then it puts out 15kHz). The JPAC will keep you from frying your monitor by blocking unsupported frequencies ... unless, of course you randomly mess with the jumpers.

I should have asked if he had sync lights. I also should have asked about resolution -- I have some monitors that just don't like some resolutions.
CapriRS302:
You are going through the trouble of using an arcade monitor, but you want to use the X-Arcade controls instead of designing your own control panel? 
You have it a bit backwards.  Unless you are REALLY into some form of authenticity, save yourself the trouble and use a PC monitor instead.  You can get a 21 or 22 inch flat screen CRT for nothing, and they work really well.  If you need something bigger just find a TV.  Really, you won't notice the difference, but they are much nicer than an Arcade monitor.  And get rid of the X-Arcade controls.....


;)
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