The Code and info of a game are usually provided on the emulator by the use of a ROM file (a replica of game cartridge data) or an ISO graphic (a duplicate of optical media).[citation needed] When emulation softwares them selves are legal assuming that they don't infringe copyright protections https://rafaeltiesy.total-blog.com/the-greatest-guide-to-retro-games-online-60099476