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Mac OS 9.1 was released on January 9, 2001, and was available either as a 71 MB update (either in one piece or as separate segments) or as a "full install" version (which was the only version that worked for users of language kits).

This was the last version of the Mac OS that ran on any PowerPC-based Macintosh. Future versions, including Mac OS 9.2, Mac OS 9.2.1 and Mac OS 9.2.2, as well as Mac OS X, would require -- at least -- a PowerPC G3 processor (except for the original PowerBook G3 and upgrade cards).

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Mac OS 9

Mac OS 9 | Mac OS 9.0.2 | Mac OS 9.0.3 | Mac OS 9.0.4 | Mac OS 9.1 | Mac OS 9.2 | Mac OS 9.2.1 | Mac OS 9.2.2

← Mac OS 8 | Mac OS 9 | Mac OS X →

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