Introduction to DOS (Disk Operating System)

Though UNIX was a powerful operating system available, but it was not suitable for 8-bit 8086 microprocessor based Personal Computers. So there was a need for a small operating system that could work in 640K memory (RAM). DOS, a 16-bit command-line operating system was a variant of CP/M (Control Program/Monitor) which ran for the first time on IBM-PC in 1981.

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