Ok, I got that running by now. Do you know anything about extra cycles when
I think it would be a good idea to try out the binary on a real 7800. If you look at the snake's head, you can see that the emulator is displaying the teeth over what seems to be part of the stairs. The 7800 would have to display two tiles on top of each other to do that. I don't think it would do that on it's own. So if your conversion program isn't accidentally misplacing tiles at 4K boundaries, then a problem in the emulator is a possibility.
Ciao, Eckhard Stolberg