However, in MS-DOS's early days, the greater speed attainable by programs through direct control of hardware was of particular importance, especially for games, which often pushed the limits of their contemporary hardware. This first version was shipped in August To this end, MS-DOS was designed with a modular structure with internal device drivers the DOS BIOSminimally for primary disk drives and the console, integrated with the kernel and loaded by the boot loader, and installable device drivers for other devices loaded and integrated at boot time. It is a flexible operating system, and consumes negligible installation space. It was also the underlying basic operating system on which early versions of Windows ran as a GUI. Ultimately, it was the key product in Microsoft's development from a programming language company to a diverse software development firm, providing the company with essential revenue and marketing resources. During its lifetime, several competing products were released for the x86 platform, and MS-DOS went through eight versions, until development ceased in Progressive version releases delivered support for other mass storage media in ever greater sizes and formats, along with added feature support for newer processors and rapidly evolving computer architectures. MS-DOS was the main operating system for IBM PC compatible personal computers during the s, from which point it was gradually superseded by operating systems offering a graphical user interface GUIin various generations of the graphical Microsoft Windows operating system.
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