XPostFacto is an open source utility for Mac OS 9 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 by Apple. It was released in 2002. [1]
XPostFacto allowed Darwin, OS X, and OS X Server run on unsupported Mac models. The OS X Installer would not run on machines without a G3, G4, G5, or Intel processor by default, but XPostFacto patched the installer to allow it to run. [2] A Mac OS 9 partition must be booted first. XPostFacto then runs in Mac OS 9 using an installation CD to install a version of OS X. [3] [4]
XPostFacto is available for free, but the company offered support for either $10 or $25. [5] [3]
XPostFacto 4.0 works with pre-G3 Macintosh models. [2] Beige box Power Macs as old as upgraded 7300-era machines are supported. [5] Limited support was also available for Performa 6400 and 6500 models. [6]
Engadget gave XPostFacto a negative review for its slowness, stating it "runs like a limp turtle on our old iMac G3." [7]
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