Hi, I am using this thread, because I have the same problem. My Dreamcast is connected though VGA with the OSSC and it gives me some square lines all over the LCD. If it’s hooked up with the TV only, the picture is okay, just a bit blurry, but clean.
I tried it with the DC Wiki settings from junkerhq, but it didn’t solve the problem. Also, I don’t have any other cables to test with, only the VGA ones.