|MS-DOS: MicroSoft Disk Operating System
MicroSoft Disk Operating System (MS-DOS) is an operating system by Microsoft. It was the most widely used DOS for the PC compatible platform during the 1980s. It has gradually been replaced by the Windows operating system. MS-DOS is a single user operating system that runs one program at a time and is limited to working with one megabyte of memory, 640 kilobytes of which is usable for the application program. Special add-on EMS memory boards allow EMS-compliant software to exceed the 1Mbyte limit. Add-ons to DOS, such as Microsoft Windows and DESQview, take advantage of EMS and allow the user to have multiple applications loaded at once and switch between them.
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