[TUHS] Genealogy of PDP-11 Unix

Ron Natalie ron at ronnatalie.com
Tue May 22 11:08:14 AEST 2018

Yep, as we say, it has more holes in it than Sonny Corleone.



From: TUHS [mailto:tuhs-bounces at minnie.tuhs.org] On Behalf Of Clem Cole
Sent: Monday, May 21, 2018 6:49 PM
To: Warner Losh
Cc: The Eunuchs Hysterical Society
Subject: Re: [TUHS] Genealogy of PDP-11 Unix


@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?





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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