History of Computers: MS-DOS Version 1.0 was introduced in 1981. MS-DOS is a text-based 16-Bit single-user, single-tasking operating system. Due to the fact that IBM chose MS-DOS as the operating system for its PC's it soon became the most important operating system for Personal Computers. The success of Microsoft is mainly based on the success of MS-DOS.

Later versions of MS-DOS brought some changes in memory handling and peripheral support, but because of its architecture, DOS is unable to make use of the capabilities of modern computers.

Though technically obsolete, it is preferred by many programmers (mainly developers of games), because the application has full control over all resources in the PC.