31 Mar
2020
31 Mar
'20
10:19 a.m.
Jon Elson <elson at pico-systems.com> wrote:
The VAX 11/780 absolutely had power fail, and it DID work.
So did the 11/730 and I imagine the 750 as well. No core, but there was a
battery backup option to keep main memory alive and refreshed even in the
event of power failure.
I did this quite often while swapping I/O devices and
such
after device drivers became loadable.
It was (is!) quite handy on the 730 as well. If your configuration has a
separate BA11-K for the UNIBUS peripherals, then you can power down that box
without turning off the CPU. It took 20-25 minutes to boot up the 730 from
a dead start, so this was a great time saver.
Bob