On Wed, Jan 12, 2022 at 3:54 AM <arnold@skeeve.com> wrote:

>
> - Ossanna wrote the original nroff in assembly language
> - He rewrote it in C when the C/A/T was acquired
>   At that time nroff/troff were built from mostly the same sources (as
>   can be seen in the archives).
>
That is also my understanding.