If I remember right, Bill set several teams to writing an os for devices. The one that finished first, shipped. The 'winners' weren't even OS programmers. Thus,

If I remember right, Bill set several teams to writing an os for devices. The one that finished first, shipped. The 'winners' weren't even OS programmers. Thus, the naïve implementations of so many critical OS functions (drivers, timers, interrupt handling, flash)