three things:
1) FF7 is a PSX game. there is a shoddy Chinese ripoff which was made for the NES; there has been a fan translation made of that ripoff.
2) the "retro adapter" you speak of isn't an adapter per se; it contains the NES hardware and just uses the host SNES system for power and input - the A/V output is usually connected directly to the "adapter."
3) you need an emulator that handles the system you want. there are other emulators out there which support multiple systems; however, zsnes only supports SNES/SFC and will not run NES/Famicom software.
Retroadaptor
Moderator: ZSNES Mods
Re: Retroadaptor
Why yes, my shift key *IS* broken.