> 
> Ultrix/VAX 4.4 has a DHV11 driver.  I'd like to make an equivalent driver
> for NetBSD/vax, but I'm unsure to what degree I can "refer" to the Ultrix
> source code and avoid violating DEC's copyright privileges.  Can someone 
> please give me some guidelines?
> 
You cannot have any reference to source code provided by DEC, it
would be very illegal. You shouldn't have any tainted code in mind
when writing device drivers for NetBSD. The best you can do is to
get "DHU11 Users Guide" from DEC and then look at some other
NetBSD driver (Ex. the i386 com driver) to understand what's 
nedded. But don't go near any copyrighted code.

-- Ragge