FCEUmm is a Nintendo Entertainment System / Famicom emulator. It currently supports a wide number of carts, including support for Family Computer Disk System and Vs. Unisystem. It is a fork of FCEU "mappers modified", an unofficial build of FCEU Ultra by CaH4e3, which supports a lot of new mappers including some obscure mappers such as one for unlicensed NES ROM's using the Libretro API.
Changes
This work is now discontinued!