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From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.wizards
Subject: Foreign peripherals on DWBUA (VAXBI) Unibus
Message-ID: <7856@mimsy.UUCP>
Date: Wed, 5-Aug-87 08:22:46 EDT
Article-I.D.: mimsy.7856
Posted: Wed Aug  5 08:22:46 1987
Date-Received: Fri, 7-Aug-87 07:16:56 EDT
Organization: University of Maryland, Dept. of Computer Sci.
Lines: 30

We have 4.3BSD running on a VAX 8250.  (You might ask how.  That
is a long story, and the system still needs minor :-) things like
ECC detection and better standalone code so it can boot without
manual intervention; it is by no means done yet.  But it runs.)

We discovered that one InterLAN Ethernet board, which worked fine
when the machine was a 750, no longer works.  A DEC DEUNA works,
as does a TU80 tape drive on the same bus, and I am fairly confident
that the problem has to do with the differences between a DWBUA
Unibus adapter and a DW750 or DW780.  (The InterLAN configures
properly and `works' but delivers erroneous data, as though it had
trouble reaching main memory through the DWBUA.)

We have a second 750 that is scheduled to be upgraded to an 8250
immediately, now that the first one is running.  It---alas!---has
all its disks attached to an Emulex SC41/MS, another foreign
controller.  Whether it will work on a DWBUA we do not yet know.
Now this is under a service contract; if it does not work, we at
least have someone to whom to to complain.  Complaints alone,
however, will not give us a working machine.  Even if it does work,
I still will wonder at the InterLAN's failure.  Hence (at long
last) this request:

Does anyone Out There know just what the differences are between
DWBUA Unibus characteristics and DW750 Unibus characteristics?  Or
is there available to the general public (i.e., me and/or Emulex
and/or CDC) DEC documentation detailing same?
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
Domain:	chris@mimsy.umd.edu	Path:	seismo!)
sts CT CT