Built-in feature of the Apple II

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Possible Answers: DOS.

Random information on “DOS”:
DOS /dɒs/, short for “Disk Operating System”,[1] is an acronym for several closely related operating systems that dominated the IBM PC compatible market between 1981 and 1995, or until about 2000 including the partially DOS-based Microsoft Windows versions 95, 98, and Millennium Edition.
Taken from Wikipedia