Mac OS 9.x

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Mac OS 9.x
Version of Mac OS
Preliminary name
Latest build
Release date1999-10-23
Support end2002-02-01
Mac OS 8.x
Replaced by
Mac OS X Public Beta, Mac OS X Cheetah (10.0)

Mac OS 9 is the final incarnation of the classic "Mac OS". Codenamed Sonata for its initial revision, it boasted many new Internet-based features. OS 9, like its predecessors, lacked protected memory and full pre-emptive multitasking. Development of Mac OS 9 ceased during 2001. The final updates are fixes for compatibility issues with the "Classic" environment.

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