Disk Operating System


MS-DOS is a non-graphical command line operating system derived from 86-DOS that was created for IBM compatible computers. MS-DOS originally written by Tim Paterson and introduced by Microsoft in August 1981 and was last updated in 1994 when MS-DOS 6.22 was released. MS-DOS allows the user to navigate, open, and otherwise manipulate files on their computer from a command line instead of a GUI like Windows.

Major Tasks

  • To control input and output devices
  • To enable user to load and execute program
  • To maintain an orderly system of data on the disk
major tasks of a dos

Internal Commands

DOS internal commands are loaded automatically into the memory (RAM) during boot up process when you start your system. These includes ( CLS, DIR, DEL, DATE, TIME, EXIT etc.) that are needed on regular basis.

External Commands

Usually external DOS commands are required less frequently. These reside on disk and are loaded into RAM only when needed. Some of the external DOS commands are , CHKDSK, DELTREE, FORMAT, XCOPY etc.

Next, learn about Service Software, DOS and Windows

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