source of blank eeprom chips??

[Jack Cawkwell]

Hi,

I am having problems finding places to buy empty flash 32 pin eeprom chips,
suitable for use as BIOS chips. I would like to experiment with an empty
one, rather than risk permanently damaging the existing one.
Does any one know a good source of supply. How do you decide what speed
is required?

How do I go from the writing on the chip to a eeprom spec, eg

AE29f2008-12, or
28F1000PPC-12C4, or
208GH213286801SA

Thanks Jack
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[Stefan Reinauer]

Hi Jack,

* Jack Cawkwell  [030630 22:20]:
> I am having problems finding places to buy empty flash 32 pin eeprom chips,
> suitable for use as BIOS chips. I would like to experiment with an empty
> one, rather than risk permanently damaging the existing one.
> Does any one know a good source of supply. How do you decide what speed
> is required?

Where to get them depends on the number of chips you need. I've been
getting them from a local electronics store and got some from old
motherboards, but this is only reasonable when you need a few. Prices
go down a lot if you get 50+.

Speed did never matter when I put flash chips on PC motherboards. 
Everything from -90 to -150 types worked fine. The only thing you
have to take care about is the used voltage.
> How do I go from the writing on the chip to a eeprom spec, eg
>
> AE29f2008-12, or
> 28F1000PPC-12C4, or
> 208GH213286801SA

28xxyyy-zz types are 12v, 29 and 39(?) are 5v, 49 is 3.3v.
xx is F or LF most of the time. yyy is the size, 008 and 080 for 8MBit,
004 and 040 for 4MBit, 020 or 002 for 2MBit and so on. The -zz is
the used speed.

Stefan

[ron minnich]

I get my SST 28SF040 DIP-32 parts from AVNET.

ron

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