These devices start disabled and will be that way in essentially all
working systems, but there apparently was a DECnet Phase V
support for this device, so it is added to all systems. The DPV
should now be readily testable.
As mentioned in #1152. That PR will fix the DUP device.
This commit is explicitly released from any license restriction
mentioned in the LICENSE.txt of the github.com/simh/simh
master branch changes.
