In message 
<canczdfoxe8haae+pvtvousyttyg7rgxcummwrak0lp0tgu9...@mail.gmail.com>, Warner 
Losh writes:

>Back in school, our SunOS 3, SunOS 4 and VAX running BSD 4.{2,3} we had to
>run a special ditroff [...]

ditroff = Device Independent Troff

The original troff were hardwired to the C/A/T photo-typesetter which
by the time of SVR bare existed in the market anymore.

Ditroff took a configfile and emitted a documented output, which a
device-dependent postprocessor would convert into something the
actual hardware understood.

I think I wrote about a dozen ditroff config+preprocessor combos during
the late 1980ies.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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