Common
System 6
1988 operating system version
System 6
System 6 (also known as System Software 6) is the sixth major release of classic Mac OS, Apple Computer's operating system for Macintosh computers. Released in 1988, it is a monolithic operating system that supports cooperative multitasking through an improved version of MultiFinder. The boxed version, sold for updating existing computers, retailed for US$49 (equivalent to about $130 in 2025). System 6 was included with new Macintosh computers until 1991, when it was succeeded by System 7.
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