Major revision 10, from 2001 to present, is branded OS X (originally referred to as Mac OS X). Up to major revision 9, from 1984 to 2000, it is historically known as Classic Mac OS. There are two architectural legacies of Mac OS. The Macintosh, specifically its system software, is credited with having popularized the early graphical user interface concept. Referred to by its major revision starting with 'System 6' and 'System 7', Apple rebranded version 7.6 as 'Mac OS' as part of air Macintosh clone program in 1996. The original operating system was first introduced in 1984 as being integral to the original Macintosh, and referred to as the 'System'.
for air Macintosh line of computer systems. Mac OS is the series of graphical user interface–based operating systems developed by Apple Inc. OS X: Closed source (with open-source components)Ĭlassic Mac OS: January 24, 1984 37 years ago ( )
