Another possibility was addressed by a firmware update.
The text from the current cpu firmware (41.33) update PF_CMHK4133
mentions:

- System clock (software maintained) loses time. The time loss occurs
randomly
 and may result in large losses over a relatively short time period.
 Occurrences of the above problem have only been reported against the
HP3000
 979KS/x00 (Mohawk) systems.  Software applications that perform
frequent
 calling of a PDC routine, PDC_CHASSIS, affect the amount of time lost
by
 the system clock.

Your hardware support company should be happy to update for you.

                      Bob J. -- Ideal Computer Services
                      http://www.icsgroup.com



Wirt Atmar wrote:
>
> Sam asks:
>
> > Any known cause of the system clock running slow?
> >  We have a 979-200 6.0 pp2 and it loses about 1
> >  minute per day.
>
> My first guess would be relativistic time dilation effects as viewed by an
> observer at a distance due to the fact that you're now migrating off of the
> HP3000 at an ever accelerating rate.
>
> My second guess, although it's less likely, would be that your machine has
> found out that it's about ready to be abandoned and is so depressed that it
> simply can no longer work at normal speed. We've certainly kept this
> information from our HP3000's. There's just no reason that they need to know
> this kind of thing at the moment.
>
> Wirt Atmar
>
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