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macOS Mojave Desktop (18B75)

macOS is a series of operating systems developed by Apple for their Mac platform. macOS is the second-most commonly used operating system after Microsoft Windows. It first became publicly available in 1984 with the release of the Macintosh 128k.

The classic Mac OS was originally written for the Motorola 68k architecture. The 68k architecture was used from 1984 to 1991, after which Apple transitioned to PowerPC. PowerPC would be used until the classic Mac OS's discontinuation in 2002. Classic Mac OS was based on a simple kernel design, which eventually became too limited and crash prone for applications. In response, Apple bought NeXT and used NeXTSTEP as a base to develop Mac OS X. Mac OS X continued PowerPC support until 2006 when Macs started shipping with x86 (Intel) processors. Support for PowerPC in Mac OS X was dropped in 2009.

The Classic Mac OS can run standalone, and under Mac OS X using the Classic system layer. Only certain versions of Mac OS 9 can run under the Classic system layer, and the layer itself was dropped after Mac OS X Tiger.

PearPC is a useful emulator that can run PowerPC builds of Mac OS X under Windows or other x86 operating systems. PCE and QEMU is also capable of running earlier builds of MacOS and VirtualBox and VMware can run x86/64 builds of Mac OS X.


Note: Wikipedia's and Apple's Developer CD numbering scheme is GARBAGE and shouldn't and isn't being used.

Macintosh System Software

The original Macintosh System Software is based on the Lisa OS and UI concepts from Xerox PARC. It uses a monolithic architecture but lacks support for memory management, protected memory, access controls, and conflict-free extensions. Only one application at a time could be supported under System Software until version 5 when MultiFinder was introduced.

Name Versions Release Date(s)
System Software 1.x 1.0-1.1h Released in January 1984-April 1984
System Software 2.x 2.0-2.1 Released in April 1985-September 1985
System Software 3.x 3.0-3.3 Released in January 1986-June 1987
System Software 4.x 4.0-4.1.1 Released in January 1987-July 1989
System Software 5.x 5.0-5.1 Released in October 1987-February 1988
System Software 6.x 6.0- Released in 1988-1992

Mac OS

In 1997, Apple rebranded the Macintosh System Software to Mac OS. Mac OS would continue to be developed until the introduction of Mac OS X, after which Apple only delivered minor updates to the classic Mac OS. The final minor updates were designed to ease the transition to OS X. Carbon, an API introduced with Mac OS 8, works as the transitional API for classic Mac OS and Mac OS X applications.

Name Versions Release Date(s) Codenames
Mac OS 7 7.0-7.6.1 Released in 1991-1997 Big Bang, Superbeta, Cube-E, Shuswap, Capone, Jirocho, Mozart, Son of Buster, Unity, Zeus, Gory, Harmony, Ides.
Mac OS 8 8.0-8.6 Released in 1997-1999 Copland, Tempo, Bride of Buster, Sequoia, Snowman, South Park, Allegro, Horatio, Veronica, Sarah.
Mac OS 9 9.0-9.2.2 Released in 1999-2001 Sonata, Minuet, Fortissimo, Moonlight, Limelight, LU1.
Mac OS Rhapsody Rhapsody Released in 1998

Mac OS X / macOS

Mac OS X is the current incarnation of Mac OS. The first version released was Mac OS X Server in 1999. Unlike the classic Mac OS, Mac OS X is based on NeXTSTEP (OPENSTEP) and uses its frameworks and architectures. In 2016, Apple began to use the macOS moniker to brand Mac OS X alongside their other operating systems (watchOS, tvOS, iOS).

Name Kernel Version Codename Notes
Mac OS X Server 1.0 Rhapsody Released in March 1999; the first public release of OS X without the Aqua interface
Mac OS X Public Beta Darwin 1.2.1 Kodiak Released in September 2000; first version to include the Aqua interface
Mac OS X 10.0 (Cheetah) Darwin 1.3.1 Cheetah Released in March 2001
Mac OS X 10.1 (Puma) Darwin 1.4.1 / 5 Puma Released in October 2001
Mac OS X 10.2 (Jaguar) Darwin 6 Jaguar Released in August 2002
Mac OS X 10.3 (Panther) Darwin 7 Pinot Released in October 2003
Mac OS X 10.4 (Tiger) Darwin 8 Merlot (PPC) / Chardonay (Intel) Released in April 2005 (PPC) / January 2006 (Intel)
Mac OS X 10.5 (Leopard) Darwin 9 Chablis Released in October 2007
Mac OS X 10.6 (Snow Leopard) Darwin 10 Snow Leopard Released in August 2009
Mac OS X 10.7 (Lion) Darwin 11 Barolo Released in July 2011
OS X 10.8 (Mountain Lion) Darwin 12 Zinfandel Released in July 2012
OS X 10.9 (Mavericks) Darwin 13 Cabernet Released in October 2013
OS X 10.10 (Yosemite) Darwin 14 Syrah Released in October 2014
OS X 10.11 (El Capitan) Darwin 15 Gala Released in September 2015
macOS 10.12 (Sierra) Darwin 16 Fuji Released in September 2016
macOS 10.13 (High Sierra) Darwin 17 High Sierra Released in September 2017
macOS 10.14 (Mojave) Darwin 18 Liberty Released in September 2018