43.16 groff

troff ( 43.12 ) was originally designed for a now-obsolete typesetter. One of the main limitations of this typesetter was that it could only use a total of four fonts on the same page - usually the Roman, Bold , and Italic versions of the same typeface, plus a special font that included math characters and various other symbols. It doesn't let you do things like you see on these pages, which typically include seven or eight fonts: the four listed above, plus a completely different typeface for the headings, plus a constant width font (with bold and italic variations) for use in showing scripts and examples.

The original troff was replaced with a device independent version called ditroff ( 43.15 ) , which addressed these limitations and added a lot of other new features as well. Unfortunately, on UNIX systems prior to System V Release 4, ditroff was unbundled from UNIX and sold as a separate product, so all that some systems offer is the old version.

groff	Fortunately, there is a solution. The Free Software Foundation's groff has all of the nice features of ditroff . It also includes postprocessors that convert its device independent output ( 43.15 ) to PostScript.