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Subject: Re: [TUHS] Question: stdio - Who invented and ...
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Clem Cole <clemc@ccc.com> wrote:

> To answer Ed's question, it came out of Research, but first as part of the
> typesetter support - *i.e.* 'Typesetter C', which was on V6 and PWB
> 1.0 [the new troff replacement was being written by Brian] .

The troff replacement was somewhat after V7.  The troff that shipped with V7
was still only for the CAT.

See https://www.cs.princeton.edu/~bwk/202/summer.reconstructed.pdf which is dated
January 1980.

Arnold