> From: "greg elkin" <netbsd-vax@bouncy-castle.demon.co.uk>
> To: port-vax@netbsd.org
> Date: Mon, 17 Jun 2002 20:04:53 +0100
> 
> > I have a BA23 that I converted from and to MV II/III <=> PDP11/73
> > several times. -- 
> >
> I've successfully done similar with a BA123, from uVAX-II to an 11/83 CPU 
> card & back.
> 
> Random web / doc reading leads me to suspect that there may be QBUS 
> termination issues we should be aware of however, like the uVAX QBUS CPUs use 
> 240ohm & the 11/xx use 120ohm termination & that we should be changing the 
> QBUS backplane terminators to match perhaps?...

You are worrying too hard.  A Qbus is a Qbus regardless of whether it
is attached to a uVAX or a uPDP.  A Unibus is the same bus whether
attached to a VAX or a PDP, and is not a Qbus.

    carl
-- 
        carl lowenstein         marine physical lab     u.c. san diego
                                                  clowenstein@ucsd.edu