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.
who was the programmer of ms-dos operating system
Tim Paterson Tim Paterson