I had trouble hooking a HP LaserJet printer to a Sun SLC. Here is the solution:
Printcap entry:
lp:\
        :lp=/dev/ttya:sd=/var/spool/lp:\
        :br#9600:ms=-parity:
Cable:
        2-3, 3-2, 1-1, 7-7, 4-5, 5-4
Jumper printer as RS-422 or RS-232.
The same configuration works for HP LaserJet II.
Most sources insisted on RS-422, :ms=-parity, -cstopb, -clocal, -cread, crtscts,
ixon, -opost & an output filter that echoed Esc&k2G to the printer. This didn't 
work.
Thanks to gberger@eng.clemson.edu, ellen@kuroda.com, and gift@sqi.com for 
your assistance. gberger steered me to two large printcap files on 
ftp.eng.clemson.edu. 
Thanks,
Dave Smith
-- 
\ Dave Smith   Software Trainer  \ Phone : (214) 205-8347
 \ E-Systems, Inc.                \        800-752-6163  Ext. 8347
  \ Garland Division               \ FAX  : (214) 205-6540
   \ P.O. Box 660023  M/S: DA-98100 \ Email : smith@bigd.esy.com
    \ Dallas, TX 75266-0022          \ 
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