On Jan 29, 2022, at 11:59 AM, Clem Cole <clemc@ccc.com <mailto:clemc@ccc.com>> wrote:
> 
> Plus, the "Tunis" folks in Toronto had a Concurrent-Pascal and a UNIX-like system that ran on PDP-11s.

Tunis was implemented in Concurrent Euclid, a descendant of
the Euclid programming language, designed by Ric Hort and
James Cordy. They later designed Turing, which had some
features from Pascal. [I bought their books during the '80s]

Per Brinch Hansen designed Concurrent Pascal and implemented
the Solo operating Solo operating system in it.