OS-X

[Jonathan Hutchins]

For a long time, I've been under the impression, largely from friends who have 
been running Macintoshes for ages, that OS-X was based on one of the three 
BSD forks - that essentially it was a *BSD with an Apple window 
manager/desktop environment, and with the kernel (and other programs) locked 
to the Trusted Program Module (TPM).

Comments from some of you lately led me to do some research.  It appears that, 
at least on the internet, current documentation agrees that OS-X is based on 
Openstep, which evolved from NeXTSTEP, which was derived from 4.4 BSD 
(pre-fork?) and the Mach OS.

It's funny how knowledge like this can evolve on the web.  What gets collated, 
analyzed, and archived becomes the truth.  What was known to be true at the 
time gets forgotten.   Mode Emulators become Modulator/Demodulators.  Other 
acronyms drift.