NOTE: This is actualy not a NES question but rather a SNES question
I was woundering about a thing.. is there any differents between the NTSC game code and the PAL game code for a SNES game (or a NES game)? Cuz I was thinking of useing a Final Fantasy 6 rom to make a pal cartridge of the Final Fantasy 6 game as a experiment to see if it would work. And if anyone knows that this work can anyone help me with wath type of parts the Final Fantasy 6 cartridge got.

sorry for misspellings

for actual game code its doubtful there any difference, with timings there is, some nes game can be quite good in their timings (probably snes games too, which is why timing is important in emu's)

SNES is a bit different from NES, but I think there would be some differences in the code. (mostly, I think in the PAL version the gameplay needs to run slightly faster)

I've got an SNES clone system, and PAL games seem to work fine on it. Also, my NSF player has some very timing-dependant parts (like the plasma screen), I wrote it for NTSC, but it tested fine on PAL.

With that in mind, I think FF6 should work fine on PAL, but I can't say for sure. I'm not sure about the cart hardware it uses.

i have never seen any ntsc snes game that had timing problems when running on pal systems, except for the sound in tales of phantasia or star ocean maybe but thats another story.
so the answer is yes, apart from the minor speed difference it will run fine
if you exchange the cic on the cart.
the only problem is that many games released after 1993 have some sort of 50/60hz protection,that means the game checks if its running on a ntsc or pal system and acts accordingly.
most games display a message like: "this game is not designed for your snes or sfc", megaman x resets after you beat a boss, chrono trigger corrupts save states if running on a 50hz system.
these protections are generic and can be passed by with snestool or something,but if you are using the original mask rom of the game,there is no way to rewrite it of course.

Would it be possible to defeat this 50/60Hz protection with GameGenie
style ROM address modifier?

- Sepi

Yeah, that should be possible in many cases. I've patched a few games to make them run on my SNES copier, as I remember I usually only had to change a single branch condition (BNE to BEQ, for example).

I don't know if a Game Genie is able to modify all parts of larger games though, I know Goldfinger codes only work on the first 16Mbit or so.