For those of
us not involved with Unix in 1977, what was the
HRSTS system?
‘The Harvard/Radcliffe Student Time-sharing System Terminal Users Guide,
1st edition, September 10, 1974, Center for Research in Computing
Technology, Harvard University’.
These are the same folks that also did the LISP that appeared in
various 2BSD distributions as well. There's a special C compiler.
I found a description in a Usenix paper[1], and it really seems to be a
lot of "Harvard specials" in there. MACRO-11, LINK-11, DDT, TECO,
FILCOM, shell with TENEX file completion, even ECL[2]. To me it looks
like a layer of PDP-10 on top of Unix.
[1]