The SNES used an updated 16 bit version of the 8-bit 6502 in the NES. Nintendo originally planned to enable backwards compatibility, but the 16 bit version was more different from the 8-bit version than they were initially lead to believe, so they never quite got it working at the time, at least not as a plug and play solution. They did re-use most of the NES code from the original Mario games in Super Mario All Stars, which is a testament to how close the two processors really were to being directly backwards compatible, considering it would have been written in assembly.RetroArch is a cross-platform app that can run on the platforms like Windows, Mac OS x, and Linux.
It is a unique emulator that supports many different platforms like NES, SNES, Sega Master System and Genesis, and more.
