Mac transition to Intel processors

Apple's efforts to move to Intel hardware began in 1985. A proposal was floated after Jobs departed but was quickly disapproved by management.[10]

The first known attempt by Apple to move to Intel's platform was the Star Trek project, a code name given to a secret project to run a port of Classic Mac OS System 7 and its applications on an Intel-compatible personal computer.[10] The effort began on February 14, 1992, with the blessing of Intel's then-CEO Andy Grove.[10]

Apple leaders set an October 31 deadline to create a working prototype. The team met that deadline, and had a functional demo ready by December. John Sculley's departure during the Star Trek project was a factor in the project's termination. Michael Spindler, who took over as Apple's CEO, devoted most of Apple's resources to moving to PowerPC instead,[10] thus initiating Apple's first processor transition.

After Apple's 1997 acquisition of NeXT, Apple began to rework their NeXTSTEP operating system into a successor to the classic Mac OS, codenamed Rhapsody. Jobs (who rejoined Apple upon the purchase) demonstrated an Intel-compatible build of Rhapsody to Dell founder and namesake Michael Dell. Jobs offered to license the new OS to Dell for its PCs, so that users could choose between it and Windows. However, Dell declined when Jobs insisted that the company license the operating system for every PC it ships, regardless of whether or not the user wanted to use Mac OS.[11]

Then-CEO Steve Jobs announces the Intel transition at WWDC 2005.

In the years since the end of the Star Trek project, there were reports of Apple working to port its operating system to Intel's x86 processors, with one engineer managing to get Apple's OS to run on a number of Intel-powered computers.[12]

In 2001, Jobs and then Sony president Kunitake Andō reportedly had a meeting to discuss the possibility of running Apple's operating system on its Vaio computers. Jobs even presented a Vaio running Mac OS. Such negotiations ultimately came to nothing.[13]

In 2002, it was reported that Apple had more than a dozen software engineers tasked to a project code-named "Marklar," with a mission to steadily work on maintaining X86-compatible builds of Mac OS X.[14]

It was noted in 2003 by IBM in an article published to its intranet that Apple felt a transition to Intel presents massive software changes that it wanted to avoid.[15] Nevertheless, rumors of an impending announcement of a transition to Intel cropped up in 2000 and 2003.[16]

News reports of an impending announcement by Apple to transition to Intel processors surfaced in early June 2005,[9] close to that year's WWDC. The announcement was made during that year's WWDC Keynote Address.[1]

At the time Apple announced the transition, Jobs attributed the switch to a superior product roadmap that Intel offered,[17] as well as an inability to build products envisioned by Apple based on the PowerPC product roadmap.[7] Meanwhile, pricing disputes with IBM, in addition to a desire by Apple to give its computer the ability to run Microsoft Windows, were reportedly factors for the switch as well.[2][17]

Some observers expressed surprise that Apple made a deal with Intel instead of with AMD.[19] By 2005, AMD had become popular with gamers and the budget conscious,[19] but some analysts believed AMD's lack of low-power designs at the time was behind Apple's decision to go with Intel.[19]

In 2011, Apple investigated using AMD's low power Llano APU for the MacBook Air, but eventually opted for Intel due to AMD's potential inability to supply enough Llano processors to meet demand.[20]

Apple had created the world's first consumer 64-bit desktop computer with its G5 based line-up, however the first Intel-based Macs included only Intel Core Duo processors, which were 32-bit. Apple refreshed its line of computers six months later, adding Intel's new Intel Core 2 Duo 64-bit processors.

When Rosetta was announced, it was noted that the translation software is designed to translate applications that run on a "PowerPC with a G3 processor and that are built for Mac OS X."[21] It was noted at the time that translated software performs at a level between 50% to 80% of native software.[21][22] The announcement caused concerns over performance.

At the time the transition was announced, it was noted that a degree of enmity towards Intel exists amongst some fans of Apple products, due to Intel's close identification with Microsoft.[23] In addition, It was noted by Intel's then CEO, Paul Otellini, that Apple and Intel's relationship was strained at times, especially due to Apple's commission of an ad that shows Intel processors being outperformed by PowerPC processors.[23]

While there were questions over whether Apple would put the Intel Inside stickers on its products, Jobs dispelled such a possibility, saying it is redundant when Apple's use of Intel processors is well-known.[24] "Intel Inside" stickers have never been included on any Apple product.[25]

There was concern that an early announcement of the change would cause an Osborne effect,[26][27] but it was also noted that even if an Osborne effect appeared, it would merely mean delayed purchases of Mac computers, not permanent cancellations, and that Apple had enough cash on hand to weather the potential sales decline.[28]

Analysis of financial data suggests that the Osborne Effect did not materialize, with sales for Macs growing by 19% and 37% in the two quarters following March 2006.[29]

The Classic environment, the Mac OS 9 virtualization measure for Mac OS X, was not ported to the x86 architecture,[30] leaving the new Intel-powered Macs incompatible with classic Mac OS applications without a proper third-party PowerPC emulator.

There were also concerns over third-party software support, with reaction to the change being mixed amongst the software developer community, due to a need to recompile software for compatibility on Intel-based Macs.[23] In early 2006, it was reported that a number of software companies, such as Adobe, Aspyr and Microsoft, were not ready to release universal binary versions of their software offerings.[31]

In the years prior to Apple's announcement of the transition, it was noted that there was a debate over the difference of endianness between Intel and non-Intel processors, as well as the merits of each CPU architecture.[32] The difference in endianness meant that some software could not simply be recompiled; it required changes to make it work on processors of either endianness.[33]

During Apple's 2005 WWDC, the company introduced a Developer Transition Kit consisting of a prototype Intel-based Mac computer, along with preliminary versions of Mac OS X Tiger and Xcode, which allowed developers to prepare future versions of their software to run on both PowerPC and Intel-based Macs.[1]

To allow apps built for PowerPC-based Macs to run on Intel-based Macs without recompilation, a dynamic binary translation software called Rosetta was created.[21]

On January 10, Apple unveiled an Intel-based iMac,[34] as well as a 15-inch MacBook Pro laptop, which replaced the similarly sized PowerBook.[35]

On February 28, a Mac mini featuring an Intel Core Duo processor was unveiled.[36]

On April 5, the dual-boot software Boot Camp was released as a trial version, which allowed Intel-based Mac owners to run Mac OS X and Microsoft Windows.[37] On April 24, a MacBook Pro replacement for the 17-inch PowerBook was announced.[38]

On May 16, a replacement for the iBook, called MacBook, was announced, thus completing the transition of Apple's laptop line to Intel processors.[39]

On July 5, a replacement for the eMac, a special configuration of a 17-inch iMac for use in education, was announced.[40]

On August 7, Apple unveiled a replacement for the PowerMac, Mac Pro,[41] and an Intel-based version of Xserve.[42] The unveiling of the Mac Pro was touted by Apple as a completion of its transition to Intel, and said the entire process took 210 days.[41]

The first macOS to require a Mac with Intel processors, thus dropping support for PowerPC-based Macs, was 10.6 Snow Leopard.[43] Snow Leopard was shipped in August 2009,[44] three years after the transition was complete. Support for Rosetta was dropped from macOS on 10.7 Lion,[45] which was released in July 2011.[46] By that point, five years had passed since the transition to Intel was complete.

The last Apple app to feature support for PowerPC processors was iTunes 10.6.3, which was released on June 11, 2012.[47]

Apple has a policy of placing products that have not been sold for more than five years, but less than seven years, on "vintage" status, meaning hardware services from Apple service providers, including Apple Stores, are subjected to availability of inventory, or as required by law. A product is considered obsolete after it has not been sold for more than seven years, which also stops hardware support.[48] Based on this policy, all PowerPC-based Macs are now considered obsolete.

In spite of the PowerPC architecture now being considered obsolete, use of the systems remains popular in retrocomputing; multiple community projects exist that aim to allow PowerPC Macs to carry out modern tasks, such as the Classilla and TenFourFox web browsers.