OS/8 was the primary operating system used on the PDP-8 minicomputer developed by Digital Equipment Corporation of Maynard, Massachusetts. OS/8 was originally called MS/8 and, for a brief time, PS/8 ("Programming System/8") before Digital settled on the name OS/8 in 1971.A virtually identical version of OS/8, called OS/12, was later used with Digital's PDP-12 computer.Digital released OS/8 images for non-commercial purposes which can be emulated through SIMH.