On Fri, Jan 28, 2022 at 6:09 PM Will Senn <will.senn@gmail.com> wrote:

I'm reading in, Kernighan & Plauger's 1981 edition of Software Tools in Pascal and in the book, the author's mention Bill Joy's Pascal and Andy Tanenbaum's as being rock solid. So, a few related questions:

1. What edition of UNIX were they likely to be using?

I'm afraid I can't speak to your 2nd and 3rd questions, but I can offer what I think is a reasonable guess about the first.

One of the neat things about Unix and Unix-adjacent books of that era is that very often the copyright page held some information about the production of the book itself. I just so happened to have a copy of, "Software Tools in Pascal" sitting on my desk, and it says, "This books as set in Times Roman and Courier by the authors, using a Mergenthaler Linotron 202 phototypesetter driven by a PDP-11/70 running the Unix operating system."

Given the PDP-11 and the date (1981) one may reasonably conclude that it was running 7th Edition. I imagine the pascal was Joy's, from Berkeley.

        - Dan C.

The programs were first written in that dialect of Pascal supported by the Pascal interpreter pi provided by the University of California at Berkeley.  The language is close to the nominal standard of Jensen and Wirth,(6) with good diagnostics and careful run-time checking.  Since then, the programs have also been run, unchanged except for new libraries of primitives, on four other systems: an interpreter from the Free University of Amsterdam (hereinafter referred to as VU, for Vrije Universiteit), a VAX version of the Berkeley system (a true compiler), a compiler purveyed by Whitesmiths, Ltd., and UCSD Pascal on a Z80.  All but the last of these Pascal systems are written in C.