From: cdl@mpl.ucsd.edu (Carl Lowenstein)
Subject: [TUHS] flaky webster or sigma WQESD4 and RQD11 controllers on KA650???
Date: Fri, 13 Dec 2002 11:33:51 -0800 (PST) [thread overview]
Message-ID: <200212131933.LAA02973@opihi.ucsd.edu> (raw)
> From: msokolov at ivan.Harhan.ORG (Michael Sokolov)
> To: tuhs at tuhs.org
> Subject: Re: [TUHS] flaky webster or sigma WQESD4 and RQD11 controllers on KA650???
> Date: Thu, 12 Dec 02 23:29:58 PST
>
> Robertdkeys at aol.com wrote:
>
> > Is there an endemic problem with this style 4
> > port controller running too fast with a KA650
> > compared to a KA630 cpu?
>
> I have no explanation for your problem, but it has nothing to do
> with speed. Q-bus is Q-bus, and it follows Q-bus timing, which is
> completely independent of the VAX CPU timing.
Yes but there might be CPU spin-loop timing to run the serial
maintenance port from the ROM bootstrap code of the controller.
Not considered good form -- but such things happen.
Some early version of the Sigma RQD11 would work in an 11/73 but not
a KA630. I no longer remember the exact symptoms, but I was glad that
at the time Sigma was only an 80-mile drive from here.
carl
--
carl lowenstein marine physical lab u.c. san diego
clowenst at ucsd.edu
next reply other threads:[~2002-12-13 19:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-13 19:33 Carl Lowenstein [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-12-14 4:00 Robertdkeys
2002-12-14 2:30 John Holden
2002-12-14 1:21 Norman Wilson
2002-12-13 16:52 Robertdkeys
2002-12-13 7:29 Michael Sokolov
2002-12-13 5:50 Robertdkeys
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