DOS at 40

This day in history August 12,1981, MS-DOS is released. Now you know.

MS-DOS is an operating system for x86-based personal computers mostly developed by Microsoft.

Default user interface: Command-line (COMMAND.COM), text (DOS Shell)
Final release: 8.0 (Windows Me) / September 14, 2000; 20 years ago
Initial release date: 1981
Source model: Closed source; open source for select versions since 2018
Programming languages: C, Assembly language, x86 assembly language
Developer: Microsoft Corporation, Tim Paterson