86-DOS (known internally as QDOS, for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit.. 86-DOS shared a few of its commands with other operating systems like OS/8 and CP/M, which made it easy to port programs from the latter. Its application …

IBM PC DOS, an acronym for IBM Personal Computer Disk Operating System, is a discontinued disk operating system for IBM PC compatibles.It was manufactured and sold by IBM from the early 1980s into the 2000s. Developed by Microsoft, it was also sold by that company as MS-DOS.Both operating systems were identical or almost identical until 1993, when IBM began …