Fwd: Techtoolslist Digest, Vol 5, Issue 4

From: kevin spears <micrologix1500_at_yahoo.com>
Date: Fri Mar 18 2005 - 16:20:54 EST

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<P><BR>&gt;Message: 5<BR>&gt;Date: Fri, 18 Mar 2005 13:49:42 -0000<BR>&gt;From: "Martin White" <MARTIN@GUDDLER.CO.UK><BR>&gt;Subject: RE: [Techtoolslist] ms pac voltage trouble<BR>&gt;To: "'Technical Tools Mail List'" <TECHTOOLSLIST@FLIPPERS.COM><BR>&gt;Message-ID: &lt;006701c52bc1$56bbadf0$2a01a8c0@nef&gt;<BR>&gt;Content-Type: text/plain; charset="us-ascii"<BR>&gt;<BR>&gt;More times than not i find piggybacking each of the 2114's in turn with a<BR>&gt;known good one will reveal which one(s) it is. Then you only need to cut out<BR>&gt;and replace the one you've confirmed to be bad.<BR>&gt;<BR>&gt;Did this the other night on a frogger board. Someone brought one round with<BR>&gt;severe graphics problems and it turned into a 10 minute "while you wait<BR>&gt;frogger repair service" :)<BR>&gt;<BR>&gt;That's 10 minutes from plugging in, diagnosing, bad IC removal, socket<BR>&gt;installation and replacement. Nice when things go as easily as that!<BR>&gt;<BR>&gt;Martin.<BR><BR>Just
 so I get
 this straight, are you talking about taking a known-good RAM and attaching all the pins in parallel with the chip in-circuit?&nbsp; What happens when you do this?&nbsp; What does the bus see when the two RAMs output different data?</P></BLOCKQUOTE></DIV><p>
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Received on Fri Mar 18 13:26:19 2005

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