Thanks Jonathan for the pointer.
On Sat, 19 Oct 2024, Jonathan Gray wrote:
PWB was an early external distribution with troff.
Documents for the PWB/UNIX Time-Sharing System
https://datamuseum.dk/wiki/Bits:30007124
https://bitsavers.org/pdf/att/unix/PWB_UNIX/
NROFF/TROFF User's Manual
October 11, 1976
datamuseum.dk, pp 325-357
bitsavers, pp 217-249
Addendum to the NROFF/TROFF User's Manual
May 1977
datamuseum.dk, p 358
bitsavers, p 250
fonts described in:
Administrative Advice for PWB/UNIX
23. PHOTOTYPESETTING EQUIPMENT AND SUPPLIES
datamuseum.dk, p 647
I was not previously certain where the PWB release fit into the
troff timeline.
Based on comparison to the v6 manual last updated in September
1974 and published in 1975, this manual revised in October 1976
and published in 1977 now integrates troff-specific content like
the special fonts you mentioned under new title of "NROFF/TROFF
User's Manual." The major change in the meantime was the rewrite
of troff into C.[1]
1. Apparently from 1975-76 as noted in the 1992 revision of the
manual and shown in the PWB 1.0 croff source code below:
https://www.tuhs.org/Archive/Distributions/USDL/spencer_pwb.tar.gz
Best,
Dan