Let's take Zelda III for example.
What's the difference between the american NTSC and the european PAL version? If the PAL Terranigma cart ran in 60 Hz, then the PAL Zelda ROM should be able to run in 60 Hz with no problems... So what's the difference then between the PAL Zelda and NTSC Zelda, except for the protection code, or any other PAL/NTSC game?
mikael