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The history of OSx86 is a long and storied one, starting from its early roots as a BSD kernel. This page attempts to create a definitive history for OSx86.

Early Days

OSx86 started its days as the BSD mach kernel, and retains this name today. This also explains the use of many Unix and BSD terms in the operating system, including daemons, the BSD subsystem, and the entire Terminal infrastructure. This key fact also makes OS X quite portable.

However, the history of OSx86 rapidly digresses from here. The mach kernel from BSD was incorporated into the NeXTSTEP operating system, a venture by Steve Jobs, which, interestingly enough, was available for 68k, x86, SPARC, and RISC platforms, continuing BSD's tradition of portability.


It is here when OS X as we know it came into existence, at least, in a primitive form. After falling through with both IBM/Taligent's Pink and Be's BeOS, Apple settled on a new player to code its massive OS update for the 21st century, Steve Jobs. Bringing the NeXTSTEP code base with them, they quickly began work on a new version of MacOS, with the code name "Rhapsody". This contained a few interesting features: Yellow Box, a universal toolkit for OS coding, based on Java technology, Blue Box, a MacOS Classic emulation environment, and the rumored Red Box. Although Yellow Box's multiplatform support fell through, its influence is felt today in Mac OS X's Cocoa APIs.

However, the most important element of Rhapsody was once again its portability. Released publicly to developers in the form of DR1 and DR2 (DR standing for Developer Release), it was distributed in two forms -- PowerPC and x86.


This is where the classical history of Rhapsody ends, with codename "Marklar." Although it has never been publicly confirmed that this codename existed, it is rumored to have been the project to keep OS X for Intel in sync with PowerPC builds. Although it's obvious that these ports would not have been production quality, it's quite likely that these rough ports were maintained to reduce workload if, or as we now know, when, Apple decided to move to Intel.


Finally, we reach modern day. OSx86 has been distributed through rented Developer Kits, which Apple has offered to paying ADC members. There have been 3 released builds, each of which begin to perfect the software and bring it up to speed with its sibling, OS X for PowerPC.


  • 1977 - BSD offers its first release for PDP-11
  • 1989 - NeXTSTEP 1.0 released, based on BSD mach kernel
  • 1992 - NeXTSTEP 486 (3.0) released, adds support for x86
  • 1995 - Final verison of NeXTSTEP, 3.3, is released, supports 68k, x86, SPARC, and RISC platforms
  • 1997 - Apple acquires NeXT Inc. and begins work on Rhapsody, releasing DP1 in September
  • 1998 - Apple updates Rhapsody with DP2
  • 1999 - Mac OS X Server is released, x86 support has strangely disappeared from Rhapsody, however is retained in the first version of the open source Darwin, released by Apple
  • 2000 - Mac OS X Public Beta 1 is released, once again, with no x86 support, this trend continues in OS X releases
  • 2000-2005 - Apple Developers maintain an Intel port of OS X, supposedly codenamed "Marklar"
  • 2005 - Apple announces the return of OS X on x86, with new Mac Intel boxes on the way. Apple releases multiple builds of OS X for Intel to developers owning Developer Transition Kits.
  • 2006 - Apple releases the first Intel based Macs, The iMac and the MacBookPro, both of which are using an Intel Core Duo processor


These versions of Mac OS have been built for x86-based systems:

  • October 1992 - Apple completes a prototype for the Star Trek project, a port of System 7 to x86 machines.
  • September 1997 - Rhapsody Developers Release 1 (DR1) is distributed
  • 1998 - Rhapsody is updated to DR2
  • July 2005 - Apple ships Developer Transition Kits, loaded with Mac OS X 10.4.1
  • September 2005 - Mac OS X 10.4.2
  • October 2005 - Mac OS X 10.4.3
  • January 2006 - Mac OS X 10.4.4 is shipped with new Intel Macs, officially creating Mac OS for x86-based processors after 14 years in limbo
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