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Purdue has a similar OS, Xinu, that was created for teaching. It is actually used in industry around the world. - http://www.xinu.cs.purdue.edu/

+1 I learned a boatload by reading the xinu books.

Also met Doug, he's a great guy, old school C hacker.

The OS classes at several universities revolve around reimplementing Xinu and really getting to know a linksys router.