[TUHS] Genealogy of PDP-11 Unix

Warner Losh imp at bsdimp.com
Tue May 22 08:22:57 AEST 2018

In case people are wondering, I found this
https://www.quora.com/What-is-Unix-and-why-is-it-important which contains a
blue-oval chart that shows it being derived from CB Unix 3. But that the
sources were also different than the ones for VAXen, etc. At least that's
the implication here. Is this chart in error?


On Mon, May 21, 2018 at 2:30 PM, Clem cole <clemc at ccc.com> wrote:

> It contains Features from CB Unix but was not the same thing.  In
> particular shared memory and semaphores were contributed by Dale’s team but
> it was PWB 3.0 that was rebranded system III and then updated and released
> by USG aka summit eventually as sys V.   System IV was not released outside
> the bell system I’m not sure if it ever went out inside.
> Sent from my PDP-7 Running UNIX V0 expect things to be almost but not
> quite.
> > On May 21, 2018, at 1:22 PM, Warren Toomey <wkt at tuhs.org> wrote:
> >
> > I had an e-mail from someone who said:
> >
> >  PDP-11 Sys V is apparently derived from Unix CB 3.0, not from the
> >  normal route... Or so says the great interweb :)
> >  I found a family tree that suggests this. Know anything about this?
> >
> > I hadn't heard of this before, can anybody substantiate or negate this
> > assertion, or shed more light on the genealogy od PDP-11 System V?
> >
> > Thanks, Warren
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