MS-DOS (MicroSoft-Disk Operating System) is functional system with a command line environment created by Microsoft. It was the most widely used member of the DOS family of operating systems. In the 1980s it was the dominant operating system for the compatible PC (personal computer) platform. It was gradually replaced by various versions of the operating system Windows.
The MS-DOS operating system was released in 1981 and was followed by eight major versions before Microsoft stopped developing it in 2000. It was the main product of Microsoft, which gradually transformed it from a company creationof programming languages at a software and application development company as MS-DOS evolved into the Windows operating system.
Below you will see an advertisement from dark ages των computers.
This ad ran in several magazines, including InfoWorld. “MS-DOS gives you the only complete set of software tools for 16-bit systems”. InfoWorld. Vol. 4, no. 15. April 19, 1982. Pg. 10. ISSN 0199-6649.
With information from wikipedia.org