Initial releases:
System 1: January 24, 1984
Mac OS 8: July 26, 1997
OS X: March 24, 2001
On January 24, 1984, Apple Computer Inc. (now Apple Inc.) introduced the Macintosh personal computer, with the Macintosh128K model, which came bundled with what was later renamed the Mac OS
2020
John Coleman Jr in 1980
If you are referring to the operating system then a Mac's default operating system is called Mac OS X. A Mac can be downgraded to run most versions of the Windows operating system from XP to 7.
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Apple is responsible for developing the Mac operating System.
Software is written to use the facilities provided by a particular operating system. A Mac's default operating system is Mac OS X. A Mac can also run the Windows operating system. If the Mac has the required operating system to support the software on the external drive then it can run it.
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Mac OS is the first operating system developed in the year 1955
15th century when dinosaurs walked the earth.
Mac OS X
Mac OS
ios