Wayne, I did not check the reference Al sent you, but you can download HPGL/2, PJL and PCL reference manuals from Hewlett Packard. You need to sign up in the developers centre and then there are a couple+ of PDF's with the complete references for those languages.
I did this quite a long time ago (like 2 years) so I forgot the exact webpage, etc. but If you can not find them, I can try to find them for you (I just tried and failed misserably, but with more time I should be able to find them)
* Update
Well I found it (or a very similar one) and no need to sign up (which was a good thing for I can not seem to remember my user name/password :)
http://h20000.www2.hp.com/bc/docs/support/SupportManual/bpl13210/bpl13210.pdfThat points to part I and in the first page it has a link to part II
* /Update
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges
