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See Mac Support in Tech 1984 System 1 1985 System 2 1986 System 3 1987 System 4 1987 System 5 1988 System 6 1991 System 7 Built-in co-operative multitasking 32-bit clean. Virtual memory. Improved user interface. 1995 Mac OS 7.5.1 Name changed from System x to Mac OS x 1997 Mac OS 8 1999 Mac OS 9 dropped support for 68K macs OS X is a Unix-based operating system built on technology developed at NeXT, the company Steve Jobs started after he was ousted from Apple. It is a version BSD UNIX. 2001 Mac OS X v10.0 (Cheetah) 2001 Mac OS X v10.1 (Puma) 2002 Mac OS X v10.2 (Jaguar) 2004 Mac OS X v10.3 (Panther) 2005 Mac OS X v10.4 (Tiger) 2007 Mac OS X v10.5 (Leopard) 2009 Mac OS X v10.6 (Snow Leopard) dropped support for PowerPC Macs 2011 OS X v10.7 (Lion) dropped Rosetta, making it incapable of running PowerPC applications. 2012 OS X v10.8 (Mountain Lion) 2013 OS X v10.9 (Mavericks) Links: History of Mac OS - Wikipedia Return to computers
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