Main > Monitor/Video Forum
EDID Dongle... what is it and where can I get one?
SailorSat:
--- Quote ---I've just found what looks like it could be the answer in the form of Soft-15KHz but I've no idea what this EDID dongle is all about
--- End quote ---
Basically the dongle looks like this...
All it does is hook up a simple I²C EEPROM to the DDC Pins.
Now the VGA can get EDID Data from the dongle.
Actually I still build them on request as of now there basically was no "big" need for them. I've build about 20 pcs over the last two years.
Thats why you can't find them in any shop.
Fact is, NVidia doesn't seem to know what they want...
There is a "safe mode" for pre-DDC (non EDID capable) displays.
The OLD drivers (like 66.93 to 91.47) didn't have this safe mode at all.
The frist drivers with GeForce 8 support (don't remember the revision) added the safemode for GeForce 8 and newer cards but NOT for the older ones.
The current drivers (192.xx) seem have this safemode enabled for every chip generation...
Somewhere in between the safemode was gone completely...
So what does this "safe mode"?
Actually it limits the card to a hand full of resolutions (640x480, 800x600, 1024x768, each at 60Hz).
Some driver revisions allow other modes too, but output them in "safe" 31-48kHz.
ghostkiller:
Im sort of in the same boat as well. Im running an 800GTX and running it from a pci-e to vga adapter into a jpac through the jamma harness. I get the split screen which Im assuming is failure to pass a 15khz signal to the monitor. Im also assuming i need this EDID dongle which im having problems locating for sale. Ive been told I need an arcadevga card as well but Im pretty sure this 8800gtx will work since I already have it and ive read elsewhere of people using it on a mame cab with an arcade monitor. The monitor is a cga 27 inch. Im using soft 15khz and quick res, only tried 640x480.
SailorSat:
You can test if the dongle would help by booting with a VGA monitor attached.
After the windows boot screen your vga monitor should turn off/display "out of range".
Now swap the vga cable to one connected to the jpac and you should have a perfect 15khz picture on your cab
ghostkiller:
--- Quote from: SailorSat on April 03, 2010, 02:11:18 pm ---You can test if the dongle would help by booting with a VGA monitor attached.
After the windows boot screen your vga monitor should turn off/display "out of range".
Now swap the vga cable to one connected to the jpac and you should have a perfect 15khz picture on your cab
--- End quote ---
ok Ill give that a try monday when I can get my hands on this pesky thing again. lol From what ive told you though do you think I just need the EDID dongle or that I may need an arcadevga card or do I need to do this test first before asking more stupid questions?
SailorSat:
Well I've came up with the whole EDID dongle thing because of a GF 8600GT refusing to boot into 15khz with the arcade screen attached, but running fine booting with my old Dell VGA screen :)
Until today I got every GeForce to work in 15kHz... At least in XP .)
An ArcadeVGA pretty much is the plug'n'play solution, however it also limits you in several ways.