
DOS /dɒs/, short for Disk Operating System,[1] is an acronym for several closely relatedoperating systems that dominated the IBM PC compatible market between 1981 and 1995, or until about 2000 including the partially DOS-based Microsoft Windows versions 95, 98, and Millennium Edition.
Related systems include MS-DOS, PC DOS and its ancestor 86-DOS, DR-DOS (includingPalmDOS, Novell...