HP's DeskWriter 870 Forum: "HP is working on new drivers, compatible with OS 9 for the DeskJet and DeskWriters printers. They will be available by the end of the month to the best of my knowledge. Check the HP website for the new driver towards the last week of the October."
further:
a note from HP that documents HP printer incompatibilities with Mac OS 9, with no current solution or workaround available. The problem affects DeskWriter 600, 660, 680, 690 Series; DeskJet 610, 612, 670, 680, 690 Series and DeskJet 850, 855, 870 Series printers.
[This message has been edited by wlonh (edited 10-21-1999).]