HP LaserJet 9000 Printer series - Manual (Page 24)

Chapter 1 Printer basics 24
Helpful printer software for increased printing flexibility
Software for Macintosh computers
Apple LaserWriter driver, version 8.6 or later
The Apple LaserWriter 8.6 printer driver comes with the Mac OS, or can be obtained directly from Apple.
PostScript Printer Description Files (PPDs) and Printer Dialog Extension (PDEs)
PPDs, for OS 9 and earlier, in combination with the LaserWriter 8.6 printer driver, access the printer features
and allow the computer to communicate with the printer. An installation program for the PPDs and other
software is provided on the CD. Use the Apple LaserWriter 8.6 Driver that comes with the computer.
Use PDEs for OS X.