Re: [TUHS] flaky webster or sigma WQESD4 and RQD11 controllers on KA650??? - TUHS

14 Dec 2002

...
  From: msokolov(a)ivan.Harhan.ORG (Michael Sokolov)
 To: tuhs(a)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(a)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(a)ucsd.edu