The PWB children used -mm  I seem to remember that the base system 3 and maybe the original sysv did not include it since troff was not apart. If you pulled from BSD or ditroff; you got it.    

Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite. 

On May 15, 2018, at 10:37 AM, Dan Cross <crossd@gmail.com> wrote:

On Tue, May 15, 2018 at 10:07 AM, Nemo <cym224@gmail.com> wrote:
> On 14/05/2018, Dave Horsfall <dave@horsfall.org> wrote (in part):
> > I had a boss once who demanded that we learn -mm; for some reason I still
> > preferred -ms, as it somehow seemed more "natural", and I still use it to
> > this day (well, when I'm not using the Mac, that is).
>
> Why not? The Mac has it: /usr/share/groff/1.19.2/tmac/s.tmac

I have some vague distant memory of a commercial Unix variant that came with troff and the -mm macros, but without -ms. I can't remember which it was (or if I'm just imagining things). Anyone have any ideas?

        - Dan C.