Is there a more iconic duo than the IBM PC and MS-DOS? Microsoft's Disk Operating System would be the final success that turned the company into what we know today. But here's a dirty little secret: DOS didn't start out at Microsoft. So how did Gates and Allen get hold of a winning program? Today we look at how Tim Paterson, an engineer at a long forgotten company, created the first x86 computer and the original version of DOS.

Important dates:

1979 - Tim Paterson builds first 8086 Computer

1980 - Microsoft licenses DOS from Seattle Computer Products

1981 - DOS ships with the IBM PC

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