As far as I know, Tom Ferrin wrote the original in the late 1970s - it is on the original UCSF tape as part of his UNIX graphics tools.   That said, Joy may have passed it along on the BSD tapes also. It's called "vcat" and converts Wang C/A/T codes to plotter strokes on a smaller (11/12in wide IIRC) Varian (originally) and small Versatec [wet / kerosene style] plotter using the 200 bpi Hershey fonts that the CMU/MIT/Stanford XGP had used.   IIRC, UCB had a large format Versatec (36"/48") and the UCB version could do N pages at a time.   In the Adobe 'transcript' package is a similar program (based on Tom work) but outputs using Adobe Fonts.    

It might take some searching "foo" to find them, but Tom's program is what most of us used back in the day before the Imagen and later Apple LaserWriter - particularly after having had access to an XGP or a Xerox Dover in college ;-)