E (PC DOS) refers to an early command-line operating system developed by IBM. Specifically, it is a version of MS-DOS (Microsoft Disk Operating System) that IBM packaged and marketed for use in its personal computers, branded as PC DOS. PC DOS was originally introduced in 1981 and was widely used throughout the 1980s and early 1990s. It provided a basic interface for users to interact with their computers and run applications.
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