So wanted to follow up on a few things. I just got my NES back from having the dejitter mod installed and I would say that it mostly worked, certainly enough that I'm satisfied with where it's at. It took out all of the jitter and removed most of the warping. Some pictures below. Considering the SNES was not as bad as the NES, I'm hopeful the results on that (when I have it done) will be even better.
Pic of the NES after having the dejitter mod done. Note the slight warp in the pipe. No more jitter present though.
https://drive.google.com/file/d/1k3XRmm ... sp=sharing
Here is a pic from my Nt Mini which presented the same issue as my NES before the mod. While you can't see the jitter in a static image, it not only has much more of a warp, but is very jittery as well.
https://drive.google.com/file/d/1k6oVLI ... sp=sharing
I also have an update on the SuperGrafx issue. I spoke to Mobius Strip Tech about seeing if he could modify an Extron RGB unit for me per SamIAm's instructions, and based on what I was seeing and what SamIAm was doing, he thought that maybe the reason SamIAm's setup was working was because the output from the lm1881 was TTL level sync. Since I had an old Retro Access Genesis 2 cable laying around, I had him modify the cable (remove the 470 ohm resistor and capacitor from the sync line) so I could try using that in my setup. Below are the various scenarios I tested.
SGX --> sync strike --> 2070R
SGX --> sync strike --> Extron RGB --> 2070R
When I tried these I got a rolling screen like there was a sync issue and the picture was kind of flickery/pulsing. When connected through the Extron, it didn't register any frequency, as if it didn't recognize there was a signal. However, in both cases, it seemed like the flagging was gone. I have a video of it below.
https://drive.google.com/file/d/1jx03bm ... sp=sharing
SGX --> gscartsw 3.4 --> 2070R
SGX --> gscartsw 3.4 --> sync strike --> 2070R
SGX --> gscartsw 3.4 --> Extron RGB --> 2070R
SGX --> gscartsw 3.4 --> sync strike --> Extron RGB --> 2070R
With all of these I got a picture that was so dark I could barely make it out, but it seemed to still have the flagging. It looked like sync was fine though since the picture wasn't rolling. Also when connected to an Extron RGB, it recognized the signal and showed the correct frequency.
SGX --> gscartsw 5.2 --> 2070R
SGX --> gscartsw 5.2 --> sync strike --> 2070R
For both of these methods, if I have the SMS sync fix disabled it has flagging on damn near half the screen, while if I enable it the flagging is greatly reduced, but still unplayable.
SGX --> gscartsw 5.2 --> sync strike --> Extron RGB --> 2070R
This last scenario was slightly different than the two above in that the SMS sync fix didn't remove any of the flagging, as if the Extron just removed whatever the gscartsw did.
So all that said I'm gonna order another dejitter board and send my SNES out to have it added to that as well. When I do that I will probably also send out my Extron RGB 160xi to be modded per SamIAm's instructions as well. That is unless anyone else has any ideas. I feel like we might have been onto something by modifying that cable because, even though the sync is messed up, there is no flagging. The only other idea I had was that maybe the sync strike wasn't getting enough power from the scart cable because if I have the SuperGrafx connected directly to the sync strike with the modified cable, and then into the Extron RGB (with no gscartsw in between), the Extron does not appear to recognize the signal properly. Since the sync strike can get power from either the scart or from an external PSU, I thought maybe using an external power supply might be worth testing. The problem though is that since the sync strike is geared towards arcade enthusiasts, the PSU input uses screw terminals and I don't have anything laying around to test with at the moment. If anyone thinks that might be the issue though, I can certainly look into it. I would also note that if I use my properly built Genesis 2 cable, the Extron RGB recognizes the signal, but of course I have the flagging.