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.
- Recent changes in vax_watch.c changed the input parameter from a
physical address to a register address within the watch chip.
- vax630_sysdev.c called the older wtc_wr() with the new parameter,
but the length argument has been removed.
- The watch chip never starts as valid. Make it valid when the TODR is
attached (i.e. reflecting a connected battery).
- 64 bytes of bus addresses for the watch chip can sometimes be dispatched
to wtc_rd() and wtc_wr(). Make sure that reasonable memory is always
referenced for all potential accesses.
- restore vax8200 to makefile which got lost in a prior merge.
