History Of The NeXT Platform
ToothBrush writes "OSNews published an article about the BSD/Mach-based NeXT Platform, discussing its history and its capabilities back then. The article has lots of screenshots and it is generally a good introduction --of the once innovative platform-- for younger readers who are unaware of the inheritance that lead to Mac OS X."
The article doesn't mention it, but as far as I'm aware the AmigaOS was the base of much of NeXTs OS. The small tightly written exec kernel and much of the speed on the 68ks (which AmigaOS was written for) is part of that efficiency.
There's even an Amiga boing ball demo as part of the 2nd screen of screenshots.