Build list legend
|Version of Mac OS|
|Codename||Sonata (9.0), Minuet (9.0.x), Fortissimo (9.1), Moonlight (9.2), Limelight (9.2.1), LU1 (9.2.2)|
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.