Disk Operating System (dos)

Software for computer systems with disk drives which supervises and controls the running of programs. The operating system is ‘booted’ into the computer from disk by a small program which permanently resides in the memory. Commom operating systems include ms-dos, pc-dos (ibm’s version of ms-dos), cp/m (an operating system for older, 8-bit computers), unix and bos. –and macos, for macintosh computers.

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