Linked by Thom Holwerda on Thu 1st Mar 2007 22:49 UTC, submitted by _DoubleThink_
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Member since:
2006-01-04
You might want to look at DragonFly BSD and Darwin both.
I recommend DragonFly because it's designed to be less architecturally complex than the 5.x, 6.x, etc. FBSD releases.
Darwin is microkernel based with the Apple userland/GUI layered on top of it. Perhaps looking at the two will help you at this stage of study to look at the large blocks of functionality in those two common archtectures (monolithic and micro kernel).
From the hardware architecture standpoint Net BSD is what you'll want to look at since it runs on just about everything. Also monolithic so still a good counterpoint to Darwin.
These are all BSDs though, so it may not offer as much difference between each example OS as you may want in order to get a wide scope of OS architectures. But it will show you a variety of implementations developed from the same root. And you still have your Minix CD.