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microsoft disk operating system : FOLDOC | Microsoft Disk Operating System /M S doss/ (Or "MS-DOS", "PC-DOS", "MS-DOG", "mess-dos") Microsoft Corporation's clone of the CP/M disk operating system for the 8088 crufted together in 6 weeks by hacker {Tim Paterson}, who is said to have regretted it ever since. 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 1 MB 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. Numerous features, including vaguely Unix-like but rather broken support for subdirectories, I/O redirection and pipelines, were hacked into MS-DOS 2.0 and subsequent versions; as a result,
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