I think it was slightly later. I joined mid-1980 and VAXes to replace the
11/70 were being discussed but had not arrived. We needed to convert a lab
into a VAX machine room and decide between BSD and Reiser, all of which
happened in the second half of 1980.

Reiser Unix got demand paging a little later, and it was spectacularly
fast. I remember being gobsmacked when I saw a demo in early 1981.

Dead ends everywhere.

-rob


On Thu, Aug 29, 2019 at 3:57 AM Doug McIlroy <doug@cs.dartmouth.edu> wrote:

>
> > How long was research running on a PDP-11 and when did they move to a
> VAX?
>
> London and Reiser had ported Unix to the VAX, replete with virtual memory,
> in 1978. By the time v7 was released (1979), Vaxen had become the workhorse
> machines in Research.
>
> Doug
>