[expert] Printer problem on upgrade to 6.1 from 6.0

[Bill&Virginia Hodges]

My printer ceased to function when I upgraded my pentium box from
Mandrake 6.0 to 6.1.
It is a postscript printer connected to my only parallel port
at port 0x378 (IRQ 7).
Upon issueing "lpr xxx.ps" the printer starts as if it is going to print

but nothing is printed.  It is not queued in the spool either.
/etc/printcap defines /dev/lp0 as my printer device.

[hodges@hodges linux]$ ls -alt /dev/lp0
crw-rw----    1 root     daemon     6,   0 May  5  1998 /dev/lp0

Any suggestions?