Go to the previous, next chapter.
If, when you run troff, you get the message `typesetter busy', you have the original Ossanna-troff, also called otroff. Chris Lewis has a package which will let you use TeX fonts with troff -- it's called psroff, and comes with documentation.
ftp: gatekeeper.dec.com (16.1.0.2) pub/misc/psroff-3.0 ftp: ftp.cs.toronto.edu [128.100.1.105] pub/psroff-3.0/*
If, when you run troff, you get something like this:
x T 300 x res 300 1 1
you have ditroff. This is sometimes called titroff or psroff. In this case, you will probably need to do the following:
If, when you run troff, you get something like this:
X hp(SCM)(CM)(AF)(AD) 300 1 1 Y P default letter 2550 3300 0 0 90 90 2460 3210
you have sqtroff:
In each case, you should be able to get help from your vendor.
Note that Chris Lewis' psroff package has software to make width tables for troff from pk files.