[TUHS] flaky webster or sigma WQESD4 and RQD11 controllers on KA650???
cdl at mpl.ucsd.edu
Sat Dec 14 05:33:51 AEST 2002
> 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 lowenstein marine physical lab u.c. san diego
clowenst at ucsd.edu
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