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Article #12727

Re: Horror Stories (was: Speed is the one true performance metric)

#12727
From: jose
Date: Tue, 18 Nov 1986 13:47
33 lines
2323 bytes
(It has come to my attention that this line is NOT(?) nescessary!)

Help help but to add my little story as well.
About 4 weeks ago (yes! a month ago) I tried to power up one of my C64's
as I usually do.  After a few seconds I noticed that it had not initiallized
so I knew something was wrong.  After the usual obvious checks (is it plugged
in, etc...) I got out my trusty multitester and looked at it and noticed
that a power line had 3v when it was supposed to have 12v!

For many days I could not find the source of the problem, so I kept on looking
and eventually decided to replace components at random (remember this ?-) and
that's where I found the source:

It turned out that a diode was put in backwards (wow!) in the power supply
but it was able to function for 9 months.  Eventually the diode died and
began to act as  wire.  When presented with a choice of going through a
diode of a wire there is very little to choose.  The 7812 got no current
and half of the system did not have the right voltage...

Who said micros are "simple"?
-- 

Jose A. Dias			       University of Toronto Computing Services
-------------------------------------------------------------------------------
The  above  ascii characters are  not, have not ever been, or will ever be, the
opinion  of  anybody,  being,  or  super-intelligent shade of the  colour blue.
They  were just a fluke.  They were put together by randomnly selecting phrases
from Vogon poetry...
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uucp:          {decvax,ihnp4,utcsri,{allegra,linus}!utzoo}!utcs!jose
bitnet:        JOSE@UTORONTO
300/1200:      (416)535-5360			      (As the crow flies... :-)
Technical Details
Message-ID: <1986Nov18.084754.26156@utcs.uucp>
Path: arc1-ca.pugleaf.net!utzoo!utcs!jose
References: <1510@batcomputer.tn.cornell.edu>

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!utcs!jose
From: jose@utcs.UUCP
Newsgroups: comp.arch
Subject: Re: Horror Stories (was: Speed is the one true performance metric)
Message-ID: <1986Nov18.084754.26156@utcs.uucp>
Date: Tue, 18-Nov-86 08:47:54 EST
Article-I.D.: utcs.1986Nov18.084754.26156
Posted: Tue Nov 18 08:47:54 1986
Date-Received: Tue, 18-Nov-86 09:34:14 EST
References: <1510@batcomputer.tn.cornell.edu>
Reply-To: jose@utcs.UUCP (JOSE)
Organization: University of Toronto Computing Services, general purpose UNIX
Lines: 33
Checksum: 13693