Varian Printer/Plotter Problems

[utzoo!decvax!harpo!uwvax!katz]

We have been trying to install a Varian 11" Printer/Plotter on a VAX 11/780
running Berkeley 4.1 UNIX, and we seem to be having problems with the DMA
interface. We get all kinds of UNIBUS errors when we cat to the device. Has
anyone either encountered similar problems in bringing up the plotter OR
have they succeeded in installing it with the current Berkeley software?