Did Bill Gates ever write an original line of code himself? yes and he check at all be it went out I think the last time was on windows 95 but now have teams to make windows one time make IE so on it's to big just for one to over see it now
http://en.wikipedia.org/wiki/MS-DOS
MS-DOS grew from a 1981 request by IBM for an operating system for its IBM PC range of personal computers. Microsoft quickly bought the rights to QDOS (Quick and Dirty Operating System), also known as 86-DOS,[2] from Seattle Computer Products, and began work on modifying it to meet IBM's specification. The first edition, MS-DOS 1.0, was launched in 1982.[3] The version shipped with IBM's PCs was called PC DOS. Although MS-DOS and PC-DOS were initially developed in parallel by Microsoft and IBM, the two products eventually went their separate ways.
http://en.wikipedia.org/wiki/DOS
http://www.microsoft.com/downloads/en/details.aspx?familyid=96CC3197-B7E5-4B31-BADB-DDAAC771295F&displaylang=en
MS-DOS 6.2 Step-up Files
http://www.computerhope.com/history/dos.htm
http://query.nytimes.com/gst/fullpage.html?res=9D0CE0D81339F934A15754C0A967958260
Microsoft Widens Its Split With I.B.M. Over Software