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History of the Operating System
 April Fools Day 1976
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First Apple System launched.
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Mac OS 10.0 Cheetah PPC
Mac OS 10.1 Puma PPC
Mac OS 10.2 Jaguar PPC
Mac OS 10.3 Panther PPC
Mac OS 10.4 Tiger PPC
Mac OS 10.4 Tiger on intel
Mac OS 10.5 Leopard on PPC and intel
Mac OS 10.6 Snow Leopard - no more PPC
Mac OS 10.7 Lion OS - intel only
Mac OS 10.8 Mt Lion
Mac OS 10.9 Mavericks
Mac OS 10.10 Yosemite
Mac OS 10.11 ElCapitan
Mac OS 10.12 Sierra


 

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