font use on PS laser printer with psroff

Fri Nov 9 13:02:00 AEST 1990

Folks:
How do I use the fonts resident on my QMS-PS810 with psroff or
enscript? Font files on my SGI4D25G, IRIX 3.3.1 are for the basics
only, Roman, Helvetica, and Courier. i.e., when I run enscript or
psroff and specify a printer resident font other then one of the 
above, I get the message "enscript: can't open font metrics file 
/usr/lib/ps/.afm". I have gone through the manuals to no avail.
Thank you for any help
jim