Doh I just realized I mis-read pedro's original post, I thought he said it was different from other PCB's, but he said *no* different, selective reading I guess
Anyways, I'm still curious as to what is going on here. I didn't remember having trouble with this cart but I decided to dig mine out and check it and I am having issues. The program seems to be running fine, i.e. music is playing and demo runs and whatnot. The graphics are messed up, but not in the typical dirty connector garble / lines. Instead the picture seems very unstable, shaking all over the place. Is this the same problem everyone else is having? This seems like a timing issue to me, but if that were the case, it should consistently not work.
My cart also has mfg ID '28', I wonder if they had a bad run? To anyone who has a cart that doesn't give them trouble: Does it have a different mfg ID on the back (a 2-digit number impressed into the top-left corner of the back label, can be hard to see)?