An emulator is a software program or application that “emules”, that is, tries to imitate other software systems, mainly gaming consoles, allowing you to play your dearest vintage games. Emulator-zone.
com is a forum where users gather to discuss gaming and to share the software that will allow them to game till they drop. At the The Emulator Zone you will be able to find resources mostly for Windows and DOS (there are other pages specializing in mac, even though you can find a couple in this site), for mainly but not exclusively Nintendo, Playstation, Sega and arcade gaming consoles. The site’s forum is very active and frequently updated, so not only can users discuss any aspect of gaming they could be interested in, but they can get almost live assistance from other forum users. 
