[Diy_efi] Electrically erasable proms

[Torbjörn Forsman]

Flash eproms in dip package have been manufactured for many years and by 
many manufacturers, but it is possible that some of them now consider 
the dip package obsolete.
Anyway, there are many other manufacturers than Atmel that make flash 
eproms, for instance Spansion (formerly AMD and Fujitsu), ST 
Microelectronics, Intel.
Such flash eproms are available at electronics surplus vendors, and they 
can be salvaged from various scrapped electronic equipment (for 
instance: 486-class PC motherboards, fax machines, printers, dial-up 
modems, satellite tv receivers).

Best regards

Torbj?rn Forsman



Bret Levandowski wrote:
> Are you speaking of the memcal as in the calpack or something like the older 747 ECM? If you're talking the older 747 style, you need to modify it with a chip socket to accomodate the EEPROM. Then you will need to re-address the chip when burning it. 
>   JW at  www.customefis.com does these conversions and transfers the bin from your old PROM. I think it's around $75.    Ski
> 
> Joe Boucher <boucherj at prodigy.net> wrote:
>   In the Transtonics web site, they claim there are electrically erasable prom
> chips which are direct replacements for the 27C256 and 27C512 uv erasable
> eeproms. http://xtronics.com/memory/efi_ecu_faq.htm
> 
> Yet, when I pull down the fact sheets for the Atmel 29C512 fact sheet, there
> are no chips made in the dip format which will fit the GM memcal.
> 
> Am I missing something?
> 
> Thanks,
> 
> Joe B.
> 
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