Yeah the Neo Geo does not follow the NTSC specs when it comes to refresh rate.
The NTSC Refresh rate is actually 59.94Hz (29.97Hz for interface) and not a perfect 60hz, this has to do with the color subcarrier.
I understood it as the MVS puts out estimate 59.1856060~ Hz Refresh Rate. Some HDMI devices can tolerate this, others has there parameters programed too tightly and not accept the input.
The SNES is another gaming system that didn’t follow the NTSC specs when to comes to Refresh, it outputs like a 60.08 Hz refresh.
As for your 32 Inch Trinitron? I am not sure why a CRT is being thrown off. Do you have a 'newer" Model Trinitron? Some Sony PVMs also have a issue with sync from game systems. Specifically I forgot what model has major issue with the Sega Master system and Sync on RGB video.
You could look into a dedicated Sync processor, I forgot the model number from extron, but it something to look into.
The one I am having issue with is a Sony 32FV310. I don’t get this issue at all on my D24E1WU or 20M4U.
Funny you mention the SNES because that gives me a rock solid image without any waves. JROK sync “Cleaner” does nothing to fix the signal on the 32inch. I’ll look into a Extron but that would be such a crazy signal flow for my setup.
The 32inch TV also does not have any of the “sync processing” service menu options that the foreign versions have that do PAL/SECAM etc.
I do have a Shinybow SCART to YUV box that is collecting dust. Maybe it will handle the sync pulses better than the JROK but I think it is just the TV at the end of the day.
I haven’t had time to scope around more on the MVS but we will see!
Oh you got one of the later CRT Trinitron, one of the WEGA Tvs, I am assuming Component input, 1 front and 2 rear S-video inputs, and 2 rear composite inputs?
I would try the Shinybow, but there no guarantee it would fix the issue. One Youtube review went to say he can’t get NES and SNES to work on the Shinybow.
I don’t know how it helps, but here is a interesting thread on one guys 240p setup.
Another person had issues with the Neo Geo Frame rate, where he was modding the arcade board for HDMI
His solution was to slightly overclock the MVS CPU itself by1% bumping the frame rate closer to NTSC standards.
As much of the frame rate of these old game consoles were sometimes a byproduct of the CPU.
I don’t remember if there was a Bios mod for this or not.
[Edit] - it’s not the standard Unibios, I just checked with my MVS board that uses a v3.2 Unibios and the frame rate shows up on my OSSC as "59.18"hz
Thanks for putting this together, it was very useful info to me.
I used these values in a MVS 2slot.
I left pots on because it was the same ammount of work, on the two slot I found 150OHM to be the sweet spot.
I am now working on making a board for this with SMD components as I am going to consolize 2x1 slots and a friend needs a couple as well. It is my first attempt at designing a board, not sure how it will come out.
I had included the timestamp in the link I posted (watch?v=qFwL-1cxgEY&t=5989s) not sure why it is not working for you.
If you need the timestamp, it is 1:39:49.
This is all over my head but from my investigation looking at the boards, on AES/CD equipment there’s a Sony video encoder (CXA1145P) whereas on the MVS all I could find behind the RGB lines was these Hex inverters (HD74LS05P)
So I think what Voultar and Ste are saying is that you need some kind of IC to properly drive a 75ohm compatible signal for consumer electronics like SCART TVs and Upscalers.
Voultar is working on some kind of AES/MVS RGB board though.
Haha I was the one that sent in the question about hooking up the MVS to the framemeister. I got video working with the framemeister using the resistors and capacitors mentioned above, but I have no idea if this is good for the framemeister. Also there is some snow (interference?) on the picture but i’m not sure what is causing that.