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From: mouse@mcgill-vision.UUCP (der Mouse)
Newsgroups: comp.sys.dec
Subject: Re: Resetting the Clock
Message-ID: <826@mcgill-vision.UUCP>
Date: Fri, 26-Jun-87 05:19:41 EDT
Article-I.D.: mcgill-v.826
Posted: Fri Jun 26 05:19:41 1987
Date-Received: Sat, 4-Jul-87 23:06:05 EDT
References: <132@hal.UUCP>
Distribution: world
Organization: McGill University, Montreal
Lines: 24

In article <132@hal.UUCP>, ane@hal.UUCP (Aydin "Bif" Edguer) writes:
> According to my VAX Hardware Handbook, the VAX-11/750 has two clocks,
As does the 780, but not, I regret to have to inform you, MicroVAX-II.
(The uVAXII has a pale imitation of them; see below.)
> a programmable realtime clock and a time-of-year clock.

> How can I get the computer to reset the realtime clock using the
> time-of-year clock without taking down the system?

You already mentioned 4.3BSD (in text I deleted), so I assume that's
what you're running.  Answer:  you can't, not without kernel hacking.

The pale imitation mentioned above for the MicroVAX-II is that they
have a clock chip, presumably as accurate as any good digital watch,
for time-of-year.  They have something which interrupts every 10 ms for
an interval timer, in contrast to the big VAXen, on which the interrupt
rate is variable, and on which you can read the current count if you
need a really precise time.  WHY, WHY, couldn't they have provided a
real interval timer?  Or some way to access the time of year without
standing on your head?

					der Mouse

				(mouse@mcgill-vision.uucp)