![]() Once Mac OS X has been installed, XPF also runs under that operating system. It does not support NuBus-based PowerMacs. Only certain PCI-based models with Open Firmware will work. XPF does not support all models of Power Macintosh. The program provides a replacement boot loader for Macs with OldWorld firmware, provides a set of kernel modules to allow the Mac OS X kernel to support various pieces of system hardware which are unsupported in the retail release, and includes a mechanism to transparently boot the kernel off a supported medium - termed a "helper drive", such as the internal hard disk - even when installing Mac OS X to or from a non-bootable volume, such as a USB optical drive or a hard disk which is unsupported by the kernel or system firmware. XPF's functionality is achieved via three different routes. This software engineering feat by developer Ryan Rempel is made possible by the publication of the source code for Darwin, the open-source foundation of Mac OS X. 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 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. Likewise, Mac OS X 10.4 Tiger ended support for machines that lacked built-in FireWire ports, these being the original iMac G3s and iBook G3s, but XPostFacto allows the use of 10.4 on them. It can even facilitate otherwise-awkward installations on supported machines for instance, it allows Mac OS X v10.4, which shipped on DVD media, to be installed onto a Blue and White G3 with only an external, non-bootable DVD drive. It also allows more recent versions of Mac OS X to be installed on older G3 Macs which can only officially run earlier versions of OS X - for example, it allows Mac OS X v10.3 and Mac OS X v10.4 to run successfully on Beige G3s, 10.2 having been the last version supported by Apple. ![]() For example, it can be used to install Mac OS X v10.2 on a PowerPC 603 and 604 Mac like the 604 equipped Power Macintosh 8600 or 9600 (Though 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). 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 - often referred to as "XPF" - runs under Mac OS 9 and allows an unmodified Mac OS X installation disc to be launched on machines which cannot boot Mac OS X unaided. XPostFacto is an open source utility that enables the installation of PowerPC versions of Mac OS X up to Mac OS X v10.4 (Tiger), and Darwin on some PowerPC-based Apple Macintosh systems that are not officially supported for them by Apple. This article may need to be rewritten to comply with Wikipedia's quality standards. ![]()
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