Rich - thanks, that's the paper I referred to. Note date -- 6-Jan-80 - the
work being done in the summer of '79.  A number of us had been using
ditroff as it had existed for a couple of years by that time, and as the
abstract says - they got the Mergenthaler in the Summer of '79.  What I did
not remember was when the Mergenthaler work started.  I did remember that
it was after the APS-5 had been available for a while.

Just for completeness, Judge Green mandated the breakup of the Bell System
on January 8, 1982 -- Tool Chest *et al*. is set up later  --  all part of
the ability for AT&T to be in the commercial computer business.

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On Sat, Jan 6, 2024 at 4:05 PM Rich Salz <rich.salz@gmail.com> wrote:

> Also https://www.cs.princeton.edu/~bwk/202/index.html has some papers
> with Brian as co-author that talk about the history or the 202 and the
> background work (troff->ditroff) involved.
>
> I am sure these have been posted here before.
>