According to Peter C.J. Graham:
75 pre-dates both Gilbert and myself, I believe but there certainly was a PDP 11/45 here in the late 70's. I'm not sure what whether the original 11/45 was around in 75. Might just have been someone who was interested but didn't have hardware yet. Gilbert, do you know if Doug was active with Unix at that time?
My earliest recollection, and earliest contact with the department of Computer Science, is from the spring of 1978, when I came for an open house. I saw the Norpak graphics system as well as some other demos, which I later learned made use of the PDP 11/45, behind the scenes, running UNIX Sixth Edition.
By the time I started working (part-time) for the department, late in my first year of study, in 1980, the PDP 11/45 was still running UNIX 6ed. One of the first tasks that my brother and I undertook, when we were put in charge of administering that machine a year later (summer of 1981), was upgrading to UNIX 7ed, which had been released in 1979, and which had been purchased and was (sadly) sitting on the shelf for almost two years.
I have no knowledge of specifics pre-1978, but I'm quite sure the PDP had been around for a few years already, so it's quite possible that UNIX 6th edition (released May 1975*) had been purchased for it, or in anticipation of using it at a later date.
According to Bill Reid:
John,
Thanks for the URL. That list which includes U of M was a 1975 Unix mailing list not a list of Internet nodes. The U of M did not become an Internet node until 89-90.
And one of my first tasks after going to work full-time for the department, in the fall of 1989, was to get our systems Internet-ready.
Gilbert were you at the U of M in 75?
I'm not _that_ old! ;)
I think Computer Science ran Unix on a PDP in the early days.
Yes, they did, but I'm not sure how far back the "early days" go in this case...
* History of UNIX / Linux and other variants http://www.computerhope.com/history/unix.htm