Is Ms-Dos really developed by Micro soft.?

Question

Is the OS created by Gates or it is also purchased from others for royality as lotus-excel

Answer 1

MS-DOS began as QDOS (for Quick and Dirty Operating System), written by Tim Paterson for computer manufacturer Seattle Computer Products (SCP) in 1980. It was marketed by SCP as 86-DOS because it was designed to run on the Intel 8086 processor. 86-DOS function calls were based on the dominant CP/M-80 operating system, written by Digital Research, but it used a different file system. In a sequence of events that would later inspire much folklore, Microsoft negotiated a license for 86-DOS from SCP in December 1980 for $25,000, then re-licensed 86-DOS to IBM. Microsoft then acquired all rights to 86-DOS for only $50,000 from SCP in July, 1981, shortly before the PC's release.


The original MS-DOS advertisement in 1981.IBM and Microsoft both released versions of DOS; the IBM version was supplied with the IBM PC and known as PC-DOS. Originally, IBM only validated and packaged Microsoft developments, and thus IBM's versions tended to be released shortly after Microsoft's. However, MS-DOS 4.0 was actually based on IBM PC-DOS 4.0, as Microsoft was by then concentrating on OS/2 development.[citation needed] Microsoft released its versions under the name "MS-DOS", while IBM released its versions under the name "PC-DOS." Initially, when Microsoft would license their OEM version of MS-DOS, the computer manufacturer would customize its name (e.g. TandyDOS, Compaq DOS, etc). Most of these versions were identical to the official MS-DOS; however, Microsoft began to insist that OEMs start calling the product MS-DOS. Eventually, only IBM resisted this move.

Computer advertisements of this period often claimed that computers were "IBM-Compatible" or very rarely "MS-DOS compatible." The two terms were not synonyms. There were computers which used MS-DOS which could not run all the software that an IBM-Compatible machine could. An example is the Morrow Pivot, which used MS-DOS but was not IBM-Compatible.

Answer 2

MS-DOS stands for Microsoft Disk Operating System. It was not originally created by Microsoft, they bought the rights to it:
http://en.wikipedia.org/wiki/MS-DOS