Amit Singh (the same guy who hacked the 'book motion sensor), author of the newly released "Mac OS X Internals: A Systems Approach," has made an expanded version of first chapter of the epic 1700 page tome available online as a free PDF download. Entitled "A Technical History of Apple's Operating Systems," the piece covers the entire gamut of operating systems that Apple has ever shown the least bit of interest in since its birth 30 years ago.
Weighing in at 140 pages and 3MB, the chapter delves pretty deeply into the technical aspects of Operating Systems, and might be a bit dense for some less tech savvy readers. I haven't yet read much more than the first few pages yet (other than skimming), but I can tell this will be an interesting and invaluable read that will give me a better grasp on OS X by showing me where it has been.
Free Mac OS history PDF
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