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From: maxwell@ablnc.UUCP
Newsgroups: comp.unix.questions
Subject: Re: SET CLOCK FAST & 785/4.3 tod clock
Message-ID: <306@ablnc.ATT.COM>
Date: Mon, 31-Aug-87 08:32:49 EDT
Article-I.D.: ablnc.306
Posted: Mon Aug 31 08:32:49 1987
Date-Received: Tue, 1-Sep-87 03:56:53 EDT
References: <6989@reed.UUCP>
Organization: AT&T, Maitland, Florida
Lines: 18
Summary: SET CLOCK FAST is hardware test option

In article <6989@reed.UUCP>, bart@reed.UUCP (Bart Massey) writes:
> We tried using SET CLOCK FAST to bump the cpu clock speed on our
> VAX 11/785 running 4.3BSD/NFS from Mt. Xinu.  Everything seems
> to work great -- no crashes, and the system is much faster, *except*...

When I took the VAX-780 hardware courses, the SET CLOCK FAST and SET
CLOCK SLOW options were used for hardware test purposes only. The options
were to be used during diagnostics to help determine if problems were due
to timing problems in the hardware devices. If I remember correctly, the
T-O-D clock is dependent on the same oscillator as the CPU, and the
SET CLOCK options change the frequency on that oscillator.
Don't flame me if I am wrong in this case, I have never worked on the
785, and it has been 5 years since my 780 training took place and 3 years
since I worked on the hardware.

Bob Maxwell		ablnc!maxwell
AT&T DP&CT
Maitland, FL