XPostFacto is not required to run 10.5 on unsupported Macs as long as they have a G4 processor and AGP graphics, the official requirement of an 867 MHz G4 processor only needs to be bypassed at the time of installation and once installed Leopard will run without problems or requiring XPostFacto. Its fourth major revision added support for installing Mac OS X 10.4 " Tiger." Īlthough versions of XPostFacto were available before the release of Mac OS X 10.2, 10.3, and 10.4, no version was available at the time of the release of Mac OS X 10.5 " Leopard", which XPostFacto 4 does not support. Online retailer Other World Computing is a major supporter and contributor to XPostFacto. In this context, it refers to the installation of software which did not exist yet at the time the hardware was manufactured: it retroactively "applies" Mac OS X to pre-existing hardware. The XPostFacto name is a pun on ex post facto, a Latin phrase meaning "after the fact", commonly used in legal matters to refer to retroactive actions applying a later state of affairs (such as legislation) to earlier situations. On unsupported machines, XPostFacto should be used instead of Apple's "Startup Disk" control panel or system preference pane to select whether the Mac should boot into Mac OS X or an older version. Once Mac OS X has been installed, XPostFacto also runs under that operating system. XPostFacto can also be used to install Mac OS X on pre- G3 Macs like the 603 and 604 (though only up to 10.2 as Mac OS X 10.3 and newer will not run at all on a 603 or 604 processors unless the machines are upgraded to a G3 or G4 processor). It can be used to install later versions of Mac OS X on machines that Apple has declared unsupported, such as the early iMacs, beige Power Macintosh G3, the PowerBook G3 " Wallstreet" and " Lombard". This allows Mac OS X to be installed on certain Mac models which could otherwise only run System 7, Mac OS 8 or Mac OS 9, albeit sometimes with incomplete functionality. XPostFacto (formerly Unsupported UtilityX) is a freeware utility created by Ryan Rempel that allows Mac OS X to be used on PowerPC-based Mac models which cannot boot Mac OS X unaided. This article may require cleanup to meet this Wiki's standards.
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