I have an US NES with an Everdrive. Some time ago I tried to get a pre-run RNG Manipulation for Final Fantasy III which obviously only came out for the Famicom. I could not get it with the Everdrive on my US NES but with the same Rom it was no problem on an emulator. So are there differences between NES and Famicom that alter RNG and such? And would that mean that any run of a Famicom game via Flash card on NES would not be valid? Stuff like Rockman etc.

Same Question for Super Famicom comparing to SNES. I got a SFC, would playing US games on Flashcard differ from playing on Us SNES?

Differences between FC and NES versions can exist. Playing an FC game on an NES shouldn't be any different from playing it on an FC. Same for SNES and SFC.

There are probably some exceptions though, and in that case I would ask people that run those games. As for flash carts and how they operate, beats me, never used one.

FF3 RNG manip behaves differently on emu and console if I remember correctly (its been a while since I messed with it). I think on console you need to start a file, get 2 encounters, take 7 steps then reset and that will give you the RNG for the run.

I don’t know how an Everdrive messes with RAM values (I never tried maniping RNG with mine), so I can’t comment on that. However it is possible it scrambles the RAM since I think the Nightmare On Elm Street community ran into an issue where an Everdrive was unable to do standard RNG manip that a real NES cart could. So it’s possible that FF3 needs different RNG manip on flash cart too.

But assuming I remembered the pre run setup correctly, it worked for me on a real FF3 Famicom cart.

Oh , interesting. Did not know that the manipulation could be different from emu to console. So that might just have been a bad example I ran into. Isn't a Run I plan on doing many runs of in the future anyway ;-)

Good to know that apparently the Hardware acts the same. Flashcards/the everdrive is at least said to be like an original card but interesting that there might be exceptions as well. So generally no problem. Thanks for yorrick answers :)