dos

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The program requires an IBM personal computer with 128K of main storage, two double-sided disk drives, an 80-character display, and an IBM Personal Computer Disk Operating System.
5 and 2000, and ServerProtect scored 100%, the highest score possible, when evaluated on detection of disk operating system (DOS) file viruses, Microsoft Windows 32-bit file viruses, macro viruses, and script viruses.
THE firm's first break came in 1981 when IBM chose the Microsoft Disk Operating System for its first personal computer.