Here it says "The files that I included in the package are simulators: programs created from scratch by Luca MADrigal Antignano, recreating the behaviour of the original machines. If anyone wants to know more about this matter, the web page of MADrigal explains very well the difference between "emulation" (using dumped roms) and "simulation". In this case we are using "simulation", performing an imitation of the original machines.
Work on a wide range of platforms including but not limited to: Android, iOS, MacOS/OSX, GameCube, 3DS, Wii, WiiU, PSP, PSVita, PS3, Xbox, Xbox 360, Raspberry Pi, Lakka, Linux and Windows. Recently made available for the newest Nintendo Classics console series: NES, FamiCom, SuperNES and Super FamiCom Mini. http://www.madrigaldesign.it/sim/download.php
...Looks like a good one to port over for retroarch.