[Diy_efi] NVRAM chip for a 1986 GM odometer?

[Lee M. Lemoine]

Hey there,

I used to have a '88 Cavalier Z24 with the digital dash -- while it looks
nothing like the cimmaron dash, i'd imagine maybe at least some of the
circuitry was electrically similar, as the J-platform shared electronics
between 1982-1990ish (they changed everything up when they facelifted the
car.  Another optional source would be the Beretta, as i know that had a
digital option dash.

Thats not to say its gonna fix your problem either..

Best of luck!

--Lee


On 7/10/07, Torbj?rn Forsman <torbjorn.forsman at gengas.nu> wrote:
>
> 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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-- 
Sincerely,
Lee M. Lemoine
N3LEE - Amateur Radio /WQGP447 - GMRS
HTTP://WWW.N3LEE.COM