The program is designed to be used as a filter, but under MSDOS this cannot be done (pipes are considered text streams and there is no way to suppress output processing; so tabs are converted to spaces etc.). For this reason the -O flag is provided to specify an output file.
The program uses a graphics compression algorithm unique to the DeskJet family, so it cannot be used with the LaserJet series (but by specifying the -DLASERJET compile-time option it can be made to produce uncompressed output that can be used on both printers).
If you use the default fonts (times) be sure to supply troff with the correct font width tables (see vwidth(1)).
troff -t -man /usr/man/man1/ls.1v | lcat -l > /dev/lp
Very slow in the normal mode, while the draft mode has very poor quality.
Due to differences between the DeskJet resolution and the vfont resolution (DeskJet is 150 and 300 dpi, while the vfonts are 200 dpi), the program converts the requested pointsize to a more suitable one.