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From: info-vax@ucbvax.UUCP
Newsgroups: mod.computers.vax
Subject: Re: Re: Max amps summary
Message-ID: <8512101535.AA08789@diku.UUCP>
Date: Fri, 13-Dec-85 16:31:20 EST
Article-I.D.: diku.8512101535.AA08789
Posted: Fri Dec 13 16:31:20 1985
Date-Received: Sat, 14-Dec-85 03:49:25 EST
References: <1616.phil.Dione@Rice>
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In article <1616.phil.Dione@Rice> phil@RICE.EDU (William LeFebvre) writes:
>> On page 466 of the VAX Hardware Handbook (1982-83 edition) in appendix K
>> It says that the power available is:
>> 25.0 amps at +5 v
>> 2.0 amps at +15 v
>> 3.5 amps at -15 v

>I suspect that either the publication was in error, or the reader was
>not very thorough.  I don't have an 82-83 edition of the Hardware
>Handbook handy, so I can't scrutinize it myself.  BUT, I do know that
>the power available on a *780* unibus is 25.0 amps at +5 V.  I also
>know that the power available on a *750* unibus is 32.0 amps at +5 V.

That maybe true, but when our VAX-11/750 was delivered, there were ONLY
25.0 Amps @ +5 volts power supplies in it!
When DEC was asked about this, the answer was: Well, all the new ones
of VAX-11/750 is shipped with 32.0 Amps @ 5 volts.  You must have got
an old one.   But they can be upgraded for a very little extra sum of
money!
We payed the price some months back, because when we had an extra
disk controller in the backplane, the UDA50/RA81 started to report
all sorts of hard/soft errors, due to a too big power drain.

---------
Snail: Dennis Olsson, DIKU, Universitetsparken 1 - 3, DK-2200 Copenhagen N, Denmark.
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