Recently at www.taringa.com, a site in spanish appeared information, images, and the supposed file of the game taken from a computer in 1996 called "POLYBIUSDUMPBCK.7z" in which there are files without extension that contain code from which he obtained images and audio of what appears to be the real Polybius. Probably the original or one of it's first adaptations, although it hasn't been emulated yet.

source: wikipedia.org

Go to wikipedia, click on the link inside the word "information", go to taringa, and contact the argentinian guy for more information and to get a hold of the files