PostScript printers on the RS/6000?

[Just Insane.]

Is it necessary to use any special backends or frontends for PostScript 
Printers on the RS/6000's?  I have an HP LaserJet III with Pacific Page
Postscript emulation, but I can't seem to get it to work.  I have used it
on PC's, so I know the problem is not the printer.  When I try to print normal
text off the RS/6000 on this printer it works also, but Postsript chokes it.

Thanks again for any help.