[Diy_efi] NVRAM chip for a 1986 GM odometer?

[wscowell at aol.com]

-----Original Message-----
From: Gregg Eshelman <g_alan_e at yahoo.com>
To: diy_efi at diy-efi.org
Sent: Wed, 11 Jul 2007 8.33am
Subject: Re: [Diy_efi] NVRAM chip for a 1986 GM odometer?



Don't forget to check the timing diagrams for read, write and similar operations, for compatibility with the earlier part.  Electrical compatibility is only half the story.

Rgds

Will C

>I've found what seems to be a compatable chip, the
>Mitsubishi M58653P, and I found it for only $8.99
>rather than the almost $90 ripoff price Galco wants
>for a GI ER1451.

>http://www.acme-sales.net/acmecart/html/main/portal.php?country=USA&p_id=M58653P

>ACME doesn't have the GI chip.

>Comparing datasheets for the two, the only difference
>seems to be that pin 4 is a ground on the GI chip but
>is not connected on the Mitsubishi. 


 
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