Early Unix, was Re: Ultrix for DECstations

[Brent Hilpert]

Wai-Sun Chia wrote:
> > Besides, I have no desire to run old versions of Unix, I'd just as
> > soon run a supported version (almost said new version, but I still
> > use Solaris 8).  Also, I don't run Unix on my PDP-11's, as there are
> > plenty of interesting OS's that won't run on anything else.
> 
> Absolutely. I agree with you 100%.
> Running Unix on PDPs would be so..anti-climax..

On the other hand, it would be neat, historically, to have an 'original'/early
Bell Labs UNIX running on the period PDP model, but I suppose/gather such a
version no longer exists (before wider release, or before all the variant
spinoffs, or before say ~1976).

What is the oldest version (year) of UNIX available or known to be still existant?