HP7200A, HP7210A Plotter documentation needed

[Ashley Carder]

Does anyone on the list have any documentation on
the HP7200A or HP7210A plotter?  I am getting an
HP7210A plotter today, but I don't have any documentation
on it.  It looks exactly like the 7200A, but it appears
to have a few more knobs or controls on it, based on
the photographs I've seen.  I'll know more when I 
actually get my hands on it (tonight).

These plotters date from the early 1970s.  We had
an HP7200A at Wofford College in the 1970s.  Ours was 
mapped to KB7: and we had numerous plotting programs 
written in BASIC-PLUS under RSTS/E on a PDP-11/40.  
I have copies of all the programs that we had for 
interacting with the plotter.  I just don't have any 
info on hooking it up to the computer.  I'm planning 
on interfacing it to my PDP-11/40 via either a 20mA 
or an EIA DZ11 port. 

Thanks in advance for any insight or info that anyone
can provide.

Ashley