Software Support > GroovyMAME
Artifacting on Nanao MS8 29FSG w/ CRT Emu Driver (SOLVED!)
lilshawn:
they are the same monitor (same electronics) ... just a different tube.
BumbleChump:
Figured out some more things, but no closer to solving the issue.
Just to rule it out, I disconnected the ground from the Astro City, and it didn't change anything. (Wasn't planning on keeping this fix, I know it's dangerous)
Tried VGA cables with ferrite chokes, tried powering the jpac with a battery pack in case the vga and usb were causing a ground loop?
Most interesting though, I hooked up the jpac to my super gun, which is connected to a PVM, and the image is perfect.
But if I hook the jpac up to the Astro City, it looks like this. Lots of white spots in areas of high contrast change, like the right edge of her ponytail, or all over her pants. Her belt is also perfectly clear on the PVM, but it's a mess on the Astro City.
Gonna continue to experiment until this is solved....
BumbleChump:
Did some more research. The actual term for what I'm seeing is "Edge Enhancement" "Unsharp Masking" or "Ringing Artifacts"
https://en.wikipedia.org/wiki/Edge_enhancement
https://en.wikipedia.org/wiki/Unsharp_masking
https://en.wikipedia.org/wiki/Ringing_artifacts
The Unsharp Masking article says it's generally a filter that amplifies the high-frequency components of a signal. I know the jpac amplifies the video signal to arcade levels, so maybe that's playing a part in this? PVMs aren't picky and accept a lot of signals, so that's possibly why it's working on the PVM, as opposed to the picky MS8 29FSG.
Still researching....
Foxhole:
If you have a spare gpu, i would try it, just to rule out the gpu.
I've seen very strange issues happening due to bad gpu.
BumbleChump:
Ok I just ordered a new GPU. I didn't know how cheap these were! Got an HD 6450. My current card, the HD 5770 is a gaming card with an 8 pin power input. Maybe that was too much in some way for this, which is what was causing the ringing? At least, that's what I'm hoping.
Thanks for the tips so far, everyone!
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