[TUHS] Genealogy of PDP-11 Unix

Clem Cole clemc at ccc.com
Tue May 22 08:48:38 AEST 2018

@Warner Losh - the picture with the blue balloons is so wrong....   There
are a ton of errors, starting with claiming PWB 1.0 came from Fifth Edition

On Mon, May 21, 2018 at 3:22 PM, Warner Losh <imp at bsdimp.com> wrote:

> 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?
> Warner
> 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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