CUPS: Can't print to dot matrix printer

I have a dot matrix printer that I've configured under CUPS 1.2.11
as a "Generic" type printer. This dot matrix printer is connected
to the network via an HP JetDirect print server. When I try and
print using this printer, nothing prints, and I get these errors
in the error_log:


E [03/Jul/2007:14:59:14 +0500] Unable to convert file 0 to printable
format for job 25!
I [03/Jul/2007:14:59:14 +0500] Hint: Do you have ESP Ghostscript installed?


I've tried two different versions of Ghostscript, one GNU and one
HP-UX depot package. I installed 1.2.11 from the source code
under HP-UX 11.11. I copied these files from my Linux box
the HP box:


cp textonly.ppd /usr/local/cups/share/cups/model
cp textonly /usr/local/cups/lib/cups/filter


I believe these should work, but am suspicious. What do I need to
do to get CUPS working with my dot matrix printer?

-Thanks

.