DOS (from Disk Operating System) commonly refers to the family of closely related operating systems that dominated the IBM PS Compatible market between 1981 and 1995 or until about 2000.
DOS is a single user, single task operating system with basic core functions that are non-reentrant code; once a process is begun, it must be allowed to run until finished before the same process can be used again. The DOS core provides various functions for programs, like displaying characters on the screen, reading a character from the keyboard, and accessing disk files.
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