<P> MS - DOS was a renamed form of 86 - DOS -- owned by Seattle Computer Products , written by Tim Paterson . Development of 86 - DOS took only six weeks , as it was basically a clone of Digital Research 's CP / M ( for 8080 / Z80 processors ) , ported to run on 8086 processors and with two notable differences compared to CP / M ; an improved disk sector buffering logic and the introduction of FAT12 instead of the CP / M filesystem . This first version was shipped in August 1980 . Microsoft , which needed an operating system for the IBM Personal Computer hired Tim Paterson in May 1981 and bought 86 - DOS 1.10 for $75,000 in July of the same year . Microsoft kept the version number , but renamed it MS - DOS . They also licensed MS - DOS 1.10 / 1.14 to IBM , who , in August 1981 , offered it as PC DOS 1.0 as one of three operating systems for the IBM 5150 , or the IBM PC . </P>
<P> MS - DOS was a renamed form of 86 - DOS -- owned by Seattle Computer Products , written by Tim Paterson . Development of 86 - DOS took only six weeks , as it was basically a clone of Digital Research 's CP / M ( for 8080 / Z80 processors ) , ported to run on 8086 processors and with two notable differences compared to CP / M ; an improved disk sector buffering logic and the introduction of FAT12 instead of the CP / M filesystem . This first version was shipped in August 1980 . Microsoft , which needed an operating system for the IBM Personal Computer hired Tim Paterson in May 1981 and bought 86 - DOS 1.10 for $75,000 in July of the same year . Microsoft kept the version number , but renamed it MS - DOS . They also licensed MS - DOS 1.10 / 1.14 to IBM , who , in August 1981 , offered it as PC DOS 1.0 as one of three operating systems for the IBM 5150 , or the IBM PC . </P>
who was the programmer of ms-dos operating system
who was the programmer of ms-dos operating system
Tim Paterson
Tim Paterson