DOS : Disk Operating System
In the 1980s or early 1990s, the operating system that shipped with most PCs was a version of the Disk Operating System (DOS) created by Microsoft: MS-DOS.
DOS controls the computer’s
hardware and provides an environment for programs to run. This system program
must always be present when working with your computer.
MS-DOS is a disk-based, single-user, single-task and character based user interface (CUI) operating system.
Download Link: DOS: An overview with Internal & External Commands
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