A major upgrade of the Macintosh operating system introduced in 1999. System 9 added more native PowerPC routines in the Toolbox and provided tighter integration with Sherlock. See macOS.
"System 9." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/system-9>.
System 9. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/system-9
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