nroff printers

[USAFAS]

Hi,

	"nroff" allows output to go to several printers (300,300s,
450, 450s, etc.) but none of the books or documentation explains
those printers or their capabilities.  And of course I don't have
access to any of those referenced so I have been using vanilla
output.

	The printers that I have access to are an IBM PD5218
letter quality printer and an DECWRITER IV.  The IBM in particular
has a lot of power (micro spacing both horizontally and vertically).
Will any of the standard output flags work with these printers?
Are there drivers available for these printers?

		Thanks,

				hugh