The first version of the system software, which had no official name, was partially based on the Lisa OS, which Apple previously released for the Lisa computer in 1983.

It was included with every Macintosh that was sold during the era in which it was developed, and many updates to the system software were done in conjunction with the introduction of new Macintosh systems.Īpple released the original Macintosh on January 24, 1984.

The Macintosh operating system is credited with having popularized the graphical user interface concept. from 1984 to 2001, starting with System 1 and ending with Mac OS 9.

The Classic Mac OS ( System Software) is the series of operating systems developed for the Macintosh family of personal computers by Apple Inc.