I have a Model 1 non-TMSS High Definition Graphics model Genesis. While playing Earthworm Jim I noticed vertical bars that go all the way from the top of the screen to the bottom of the screen. Most noticeable on black screens. Sorry for the quality of the pics. It's the best I could do. In the first one if you view the pic at an angle you can see some of the bars the best. They don't show up that well in pics.
I hear that if I use a 32X the bars will go away. Is this true? Also sorry for the flash in the first two pics.