Released: July (9.2) August (9.2.1) December (9.2.2) 2001
System Requirements: PowerPC G3 (original PowerBook G3 not supported), 32 MB of physical RAM, with virtual memory set to at least 64 MB, and 320 MB of hard disk space
Distribution Media: CD-ROM
Apple Order Number: n/a
Versions: 9.2, 9.2.1, 9.2.2
History: Mac OS 9 was the last version of the classic Mac OS, the operating system of the Apple Macintosh computer, which was widely used in the late 1990s, as the successor to Mac OS 8, up until the debut of Mac OS X in 2001. Mac OS 9.2.1 was introduced in 2001, but only to improve the functioning of the Classic environment in the new Mac OS X (and was followed by 9.2.2 with the same purpose).
History Source: Wikipedia
History Source Address: http://en.wikipedia.org/wiki/Mac_OS_9