I wonder if it used troff or ditroff and then what it used for the ps engine (probably Ghostscript) and if ditroff, from where the font metric tables came? I also wonder what it was using for cat4 to ps conversion again like Ghostscript. Like most folks in those days (even most Universities) since Transcript was reasonably inexpensive, most people bought it after they got their first PS based printer, particularly if they had chosen to upgrade to ditroff. For Masscomp (one advantage of being a $10K-$50K machine not a $4K one), I did manage to convince management to buy ditroff and transcript and buy the distribution license for both. It increased our price by less than $100 but we justified it that we really did not want to have to support the original troff and the price to AT&T and Adobe was just cost of doing business and cheaper for us from a cost of maintenance standpoint. We then just bundled ditroff/transcript on every machine. Funny, Sun charged for both, it was fairly cheap - I want to say $500 a node (Larry may remember). But you had to buy it from Sun ala-cart. Many (most) universities did not because they already had the sources for their Vaxen, so then tended to recompile and move it.
At Stellar we used Sun's as the 'porting base' - since we had to buy AT&T redistributions licenses anyway, we didn't pay the Sun per node tax.