Submitted Dave Astle, Feb 27 2001 06:38 PM | Last updated Feb 27 2001 06:38 PM
Disk Operating System. A text-based operating system that is a descendant of CP/M (another text-based OS). Many companies created their own distributions of DOS, but the original two were PC-DOS (IBM), and MS-DOS (Microsoft). MS-DOS is the foundation of Microsoft Windows ME and earlier versions of Windows. i.e. Windows can't run without DOS.