MS-DOS

MS-DOS (Microsoft Disk Operating System) is Microsoft's first operating system for x86-based PCs. In the late 1980s and early 1990s it was the dominant operating system for IBM PC compatibles. Thereafter, it was gradually superseded by graphical user interface (GUI) operating systems, in various generations of the Microsoft Windows graphical operating system. With emulators of this operating system, such as DOSBox, DOS programs can still be used on many modern systems.