[Diy_efi] NVRAM chip for a 1986 GM odometer?

[Torbjörn Forsman]

Indeed, GI made some obscure eeproms during the late 70's and 80's. One 
common type was the ER1400, which was mainly used for saving tuning data 
in televisions, car radios etc. It has a rudimentary serial interface, 
definitely not so sophisticated and user-friendly as the SPI/Microwire 
or I2C interfaces of more recent eeproms.
One common (and awkward) thing about old eeproms is that they often use 
strange supply voltages and logic levels. I am not exactly sure, but i 
think that the ER1400 needs +5 V, -40 V and possibly one more voltage 
too. The logic levels are 0 V and -9 V.

Best regards

Torbj?rn Forsman

Scot Sealander wrote:
> Looking for the chip turned up nothing specific.  This was kind of
> interesting though.
> 
> http://www.antiquetech.com/companies/GI.htm
> 
> Antique tech?  It is getting old.  Looks like GI did make some EEPROM.
> Maybe if you could find an old data book it would help.
> 
> Scot
> 
> 
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
> Behalf Of Gregg Eshelman
> Sent: Thursday, July 05, 2007 2:34 PM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] NVRAM chip for a 1986 GM odometer?
> 
> --- Scot Sealander wrote:
> 
>>I am not sure if you are asking a question or just
>>stating your experience.
> 
> 
> Both. :)
> 
> I got the dash back, here's a picture of the chip.
> 
> http://members.aceweb.com/gregg1/nvram.jpg
> 
> I had to scrape brown glue off the chip after removing
> it from its plastic carrier frame.
> 
> Is the GI for General Instruments? It's not a Yazaki
> part, it'd have the Yazaki logo on it like the other
> chips do if it was.
> 
> 
>  
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