[Info-vax] Changed Boot behavior on XP1000 since 2013

[MichaelM]

XP1000,  VMS V7.2-1 or V7.3-2, latest Firmware V5.9-1, SYSGEN-
TIMEPROMPTWAIT=65535 (default), battery ok.

Since 2013 all machines booting up from "Power off" or after doing
">>> INIT" on the boot prompt stop booting and ask for the system time
DD-MMM-YYYY MM:HH. IF you set the time back to 2012 they boot until
login normally. All XP1000 boot normally too if power wasn't off or if
no >>> INIT was given on the boot prompt.

Only XP1000 are infected, our DS10 and some other alphas boot as
expected.

You can force the machines to boot through with another TIMEPROMPTWAIT
value, but than the system time will be inaccurate (time of last boot
or of last $SET TIME).

It seems that any time from 2013 on is an invalid time for the
processors time-of-year clock and this clock becomes important after
"power off" or >>>INIT.