Editing Mac OS X Tiger (section)

==Support for Intel processors==
{{AppleIntel}}

At Apple's 2005 Worldwide Developers Conference, CEO Steve Jobs announced that the company [[Mac transition to Intel processors|would begin selling]] Mac computers with Intel [[x86]] processors in 2006. To allow developers to begin producing software for these Intel-based Macs, Apple made available a [[Developer Transition Kit (2020)#Historical antecedents|prototype Intel-based Mac]] ("Developer Transition Kit") that included a version of Mac OS X v10.4.1 compiled to run on x86 processors.

This build included Apple's [[Rosetta (software)|Rosetta compatibility layer]] — a translation process that allows x86-based Macs to run software built only for PowerPC, with a moderate performance penalty. This is contrasted with the contemporary Mac OS 9 Classic mode, which used comparably larger amounts of system resources.

Soon after the Developer Transition Kits began shipping, copies of Tiger x86 were leaked onto [[file sharing]] networks. Although Apple had implemented a [[Trusted Computing]] [[digital rights management]] scheme in the transition hardware and OS in an attempt to stop people installing Tiger x86 on non-Apple PCs, the [[OSx86]] project soon managed to remove this restriction.<ref>{{cite magazine|url=https://www.wired.com/gadgets/mac/commentary/cultofmac/2005/08/68501|title=Mac Hacks Allow OS X on PCs|author=Mark Baard|magazine=Wired|date=August 12, 2005|publisher=Wired News|access-date=July 10, 2006|archive-date=July 27, 2010|archive-url=https://web.archive.org/web/20100727173936/http://www.wired.com/gadgets/mac/commentary/cultofmac/2005/08/68501|url-status=live}}</ref> As Apple released each update with newer safeguards to prevent its use on non-Apple hardware, unofficially modified versions were released that circumvented Apple's safeguards. However, with the release of 10.4.5, 10.4.6, and 10.4.7 the unofficially modified versions continued to use the kernel from 10.4.4 because later kernels have hardware locks and depend heavily on [[Extensible Firmware Interface|EFI]]. By late 2006, the 10.4.8 kernel had been cracked.<ref>{{cite web|url=https://www.theregister.co.uk/2006/10/25/osx_generic_intel|title=Mac OS X 10.4.8 runs on any PC...|author=Tony Smith|date=October 25, 2006|website=[[The Register]]|access-date=March 21, 2020|archive-date=March 21, 2020|archive-url=https://web.archive.org/web/20200321175058/https://www.theregister.co.uk/2006/10/25/osx_generic_intel/|url-status=live}}</ref>

At [[MacWorld keynote|MacWorld]] San Francisco 2006, Jobs announced the immediate availability of Mac OS X v10.4.4, the first publicly available release of Tiger compiled for both PowerPC- and Intel x86-based machines. This version was the first version, other than the version provided with the Developer Transition Kits, to include Rosetta.