Re: Problem reading original EPROM

["Jeff Kopp" <jkopp@direcpc.com>]

I had the exact same problem and ended up with the same solution that Mark
mentioned.  I have to make sure the prom is seated in the ZIF very well.  I
just keep moving it or putting pressure on the ZIF mechanism until I get the
same checksum everytime.  After I get mine seated correctly it works fine
until I remove the prom from the ZIF.  Like Mark mentioned rasising the prom
in the socket seems to help because it makes the legs of the prom a little
more flexible.

-----Original Message-----
From: Romans, Mark <romans@starstream.net>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: Monday, May 08, 2000 10:46 PM
Subject: Re: Problem reading original EPROM


>I have an emp10 and use a 165 ecm.  I originally had a lot of trouble with
>the same type of thing
>that you are experiencing.  I read the chip as an Intel 27C128.  I was
>putting the adapter I made
>too deeply into the zif socket.  I had to set it a bit higher when I read
>the eprom.  I read it, wiggle it a
>bit and verify that buffer matches device.  If you have any cold solders or
>any sort of problem with
>resistance it will do the same thing.  I don't think you can read one of
>these too fast. Unless it's
>an aftermarket memcal you should have no problem reading it after you work
>out the bugs.
>Mark
>----- Original Message -----
>From: "Marteney, Steven J." <smarteney@xlvision.com>
>To: <gmecm@diy-efi.org>
>Sent: Monday, May 08, 2000 10:22 AM
>Subject: Problem reading original EPROM
>
>
>> Do these things have a security bit?  I tried to read the original EPROM
>for
>> my 165 ECM (89 F-body 350 TPI) and the programmer keeps giving different
>> checksums every time I check it.  The code is APYU3516.  What should the
>> programmer be configured for?  The chip doesn't have a recognizable part
>> number (LAE8824).  ECMGuy's page says it is a 27C128.  What am I doing
>> wrong?  Any hints?
>>
>> Thanks in advance,
>> Steve Marteney
>> -------------------------------------------------------------------------
-
>--


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