🚀 go-pugleaf

We are currently using a HP laser printer on SCO xenix 2.3.3 with
disapointing through-put.  I have been in contacted with SCO and
have not received any resolution.  In Sept/Oct 1987 there was
a article written in Discover by Michael Berman for slow parallel
printers.  This article showed how to switch to polling and other
methods to fine tune the interface.

Everything we have tried has failed.  (We even talked to Michael Berman
at SCO).  SCO answer is 'we connect all our printers serial'.
By hooking our printer up serial we do get better through put, but this does
not seem like to right answer.  Parallel port should be the fastest
method and interupts rather the polling should be the way to go.

We have our printer connected to an IBM Mod 80-111.  But the problem
exsist on all of our customers that have lasers also (about 30).
These customers have a large varity of different computers and versions
of SCO Xenix.  It seems like this may be a hardware problem with hand 
shaking with the HP printers.  Does anyone out there have any ideas?
Recently I have notice that at time the printer is very fast and at other
times it runs extremely slow, and I mean SLOWWWWWWW!  It is random even
running the same output.  (memory in the laser is not the answer either
it makes no difference).