> They just show a white screen when I load them... Do you know which ROM to pick if I want to make it work? I have like 12 different versions of Tennis and 30 of the SMB ROM.. Super Mario Bros 1 (PRG 1) [d2] etc...
> What's the difference between PRG 1 and PRG 0 and what numbers ( [a3] etc ) should I avoid? Any thumb rules? :)
These are just different revision numbers and dump numbers. They shouldn't make a difference as long as you don't use bad dumps.
The real problem with mapper 0 games lies with QND's conversion. Open up a converted Mapper 0 game in a hex editor, and change byte 13 (hex) to #$00. That should make it work.