In case you were wondering, I don't think it's legal.

Of course it's not legal. And of course you are breaking the rules by posting/promoting this.

Can't read the actual link in the OP, since it's not in English, but if it is merely an emulator, it is far from illegal.  Now if it comes preloaded with roms, then yes it is illegal.  Emulating NES hardware is legal because the patents for it ran out years ago.  SW is a different matter.  But, if you have a copy of the original game, you are legally allowed to have back-up roms for it.

[citation needed]

so, what key is b? i know a is x, but i need b

Do not post links to or requests for warez. This is pretty well black and white - posting links to, or requests for, warez can and will get you banned posthaste. When we say warez, here is what we mean: copies of games, ROMs of console games (not including wholly from scratch creations, subject to any licenses said creations may have), leaked versions of not-yet-released games, even ones that will be freely available in the future. Just because you've got your hot little digital hands on a copy of the Duke Nukem Forever open beta a few years early, doesn't mean that you can share it here.