There's an interesting book about this that came out a few years ago, "A Computer Called Leo". Not available as an ebook, unfortunately, but it's on Amazon.com[1] (for crazy money), or Amazon.co.uk[2] (for a more sensible price). I think Americans can still order from Amazon.co.uk, it just takes longer to arrive.

There's also a not-too-trolly (it's from 2003) Slashdot discussion at http://hardware.slashdot.org/story/03/05/02/1621204/a-comput... .

[1] http://www.amazon.com/Computer-Called-Leo-P-S/dp/1841151866 [2] http://www.amazon.co.uk/Computer-Called-LEO-worlds-computer/...