JPAC and MiSTer Highly Saturated Calibration or MiSTer?
-
- Posts: 42
- Joined: Fri Apr 30, 2021 7:07 pm
- Has thanked: 11 times
- Been thanked: 2 times
JPAC and MiSTer Highly Saturated Calibration or MiSTer?
- Attachments
-
- 20210503_183508.jpg (5.17 MiB) Viewed 3185 times
Re: JPAC and MiSTer Highly Saturated Calibration or MiSTer?
Re: JPAC and MiSTer Highly Saturated Calibration or MiSTer?
Re: JPAC and MiSTer Highly Saturated Calibration or MiSTer?
Re: JPAC and MiSTer Highly Saturated Calibration or MiSTer?
Hi everybody, I'm running my MiSTer through Direct Video to a JPAC and running into some issues.larvanoir wrote: ↑Tue Jul 20, 2021 9:50 pm In the end I sorted this out by adding trim pots to the R / G / B lines out of the JPAC to the JAMMA harness. Just a small adjustment brought the image into normal range. I've found this also useful for arcade boards that output video too "hot" for a certain monitor (CPS2 in my case), it's easy to add to an extension harness.
It looks like I'm having the same over-saturation issues you guys are with my JPAC, a couple questions:
What rating trim pots are those? 10k?
Did you take the RGB lines from the chip out of circuit? Cut/Solder traces back to RGB out on JAMMA Connector?
Also, I'm noticing when I plug in my JPAC through the USB, it's like the JPAC loses sync and the picture scrambles, anyone else hear of this?
Pic for reference
Edit: After some poking around with a multimeter, I've come to the conclusion the JPAC is faulty, the voltage on the JAMMA Edge is only reading 0.3 volts across the RGBs lines.
Re: JPAC and MiSTer Highly Saturated Calibration or MiSTer?
It's been a while, sorry for the late post. Maybe this is good for somebody's situation, I made these little adapters to adjust the video signal some time ago and they've been very helpful.
It's just a breakout JAMMA pcb with three 1K Ohm pots for the R,G,B lines. I also added voltmeters to 5V / 12V for extra convenience. They work great in my candy cabs which have a JAMMA switcher for multiple systems. If you're switching between, say, NeoGeo, CPS-2 and MiSTerCade, you'll notice that each has different contrast levels. With this I can adjust for each board at the JAMMA connector and don't need to fiddle with the CRT levels. PCB and edge connector are from arcaniac.com