HP laserjet

A little installation problem:

on pages 16-19 of the installation guide, the procedure to install the paint drivers is explained,
The problem is: where do I get the driver for my printer ?
In fact in the GRASS source I found only the preview drivers.
How do I fix the whole thing for an HP laserjet III (with optional PS cartridge ?)
(I presume that I will have to perform a double installation,
on for the normal HP and one for the HP seen as postscript)

              thanks to anybody
              who will reply

              Andrea Giacomelli
              andreag@idra1.iar.polimi.it