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From: root@sbcs.UUCP
Newsgroups: net.lan
Subject: Re: Advice sought on VAX UNIX Ethernet/TCP-IP
Message-ID: <213@sbcs.UUCP>
Date: Mon, 27-Oct-86 23:44:38 EST
Article-I.D.: sbcs.213
Posted: Mon Oct 27 23:44:38 1986
Date-Received: Wed, 29-Oct-86 09:03:44 EST
References: <223@rabbit1.UUCP> <452@brl-sem.ARPA> <4904@brl-smoke.ARPA>
Distribution: net
Organization: Computer Science Dept, SUNY@Stony Brook
Lines: 33

> In article <452@brl-sem.ARPA> ron@brl-sem.ARPA (Ron Natalie <ron>) writes:
> >In article <223@rabbit1.UUCP>, barber@rabbit1.UUCP (Steve Barber) writes:
> [deleted text]
> >Others are
> >
> >DEUNA (DEC) - fine except you can't use it in the 750's main UNIBUS
> >rack as it draws too much power.  It is also two HEX modules so it
> >takes up a little more space.
> 
> 	Are you sure about this?  It does eat alot of current but
> a 11/750 can handle it.  (If you don't put too much else in there.)
> I filled a 11/750 Unibus with a DEUNA, DZ/11, KMC11B, and Versatec
> controller and according to my figures it was just under the rated
> current.  Note: I think the current rating depends on whether you put a
> DR11 in the Massbus.
> 
> 	However, I still wouldn't reccomend it.
> 
> 					Bill Bogstad
> 					bogstad@hopkins-eecs-bravo.arpa

Although this doesn't constitute a rigorous proof, we have run DEUNAs
in our 750's for a couple of years now without problem.  Don't have the
numbers at hand, but back when we were forced into DEUNA's, I remember
we had power to spare on our typical 750 w/o MassBus configuration:
DEUNA, UDA-50, Able DH-11, 4 Meg NSC mem, FP processor.

The real reason not to buy DEUNAs is their lack of performance, though!
The best I could get out of one using a custom driver we wrote locally
was about 160 kBytes/sec.  Surely Excelan, Interlan or one of the others
can do better than this..

					Rick Spanbauer