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Mac OS (originally System Software; retronym: Classic Mac OS [a]) is the series of operating systems developed for the Macintosh family of personal computers by Apple Computer, Inc. from 1984 to 2001, starting with System 1 and ending with Mac OS 9. The Macintosh operating system is credited with having popularized the graphical user interface ...
The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2011 and then OS X until 2016, began with the company's project to replace its "classic" Mac OS. That system, up to and including its final release Mac OS 9 , was a direct descendant of the operating system Apple had used in its Mac computers since their ...
TOS/360 (IBM's Tape Operating System) Livermore Time Sharing System (LTSS) Multics (MIT, GE, Bell Labs for the GE-645) (announced) Pick operating system; SIPROS 66 (Simultaneous Processing Operating System) [6] THE multiprogramming system (Technische Hogeschool Eindhoven) development; TSOS (later VMOS) 1966 DOS/360 (IBM's Disk Operating System)
Also marketed as System 5; System Software 6: 1988 Also marketed as System 6; Macintosh computers (68k and PowerPC) System 7: 1991 System 7.5.1 was the first to refer to itself as Mac OS; Mac OS 7.6 was the first to be branded as "Mac OS" Mac OS 8: 1997 Macintosh computers Mac OS 9: 1999 Mac OS X/OS X/macOS: Mac OS X Public Beta: September 13, 2000
The classic Mac OS is the original Macintosh operating system introduced in 1984 alongside the first Macintosh and remained in primary use on Macs until Mac OS X in 2001. [ 6 ] [ 7 ] Apple released the original Macintosh on January 24, 1984; its early system software is partially based on Lisa OS , and inspired by the Alto computer, which ...
Mac OS X is built on Darwin, a Unix-like operating system derived from FreeBSD. Darwin includes a new kernel, XNU, derived from Mach and BSD, as a replacement for the Mac OS nanokernel used in classic Mac OS. Unlike Mac OS 9, Mac OS X has protected memory and preemptive multitasking. This means that if an application's memory becomes corrupted ...
Note that most old programs can still be run using emulators, such as SheepShaver, vMac, or Basilisk II. For a list of current programs, see List of Mac software . Third-party databases include VersionTracker , MacUpdate and iUseThis .
A Macintosh clone is a computer running the Classic Mac OS operating system that was not produced by Apple Inc. The earliest Mac clones were based on emulators and reverse-engineered Macintosh ROMs. During Apple's short lived Mac OS 7 licensing program, authorized Mac clone makers were able to either purchase 100% compatible motherboards or ...