Mac OS

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Mac OS is the operating system used in Macintosh computers since their introduction. The current version of Mac OS X, which traces its roots to NextStep, Mach, and BSD. Pre-X versions of Mac OS were written in-house at Apple and were based in part on the slightly earlier Lisa Office System.

"Classic" Mac OS is still in use on many older Macs, especially 68k Macs (Macs with a Motorola 680x0 processor), which are unable to run versions newer than 8.1. (In fact, many older Macs can't run OS 8 at all.)

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