Re: EPROM identification

[Shannen Durphey <shannen@grolen.com>]

When you get a doubled listing, You're usually one size too large in
your selection.  But beware of DIY types that use the wrong size
eproms on purpose. : )
Shannen

Jeff Kopp wrote:
> 
> How can I tell for sure what the size of an eprom is?  I've got several
> chips for my '165 ECM and I have run into a situation where GM may have used
> a chip size larger than 128K but I can't figure out a way to tell for sure
> what size the chips are.  The P/N's on the chips don't seem to decode.
> Here's a sample of the stamping on one of the chips exactly how it's printed
> on the chip:
> 
> 014
> 69300
> B9617TB
> 
> Any ideas?  I've read it as a 27C128, 27C256, & 27C512.  I get a non
> repeating .bin with the 128.  The 256 reads the same as the 128 just
> repeated again at the end.  The 512 is on there four times.  That's as large
> as I can go with my Pocket Programmer and I doubt the chip is any larger
> than that (probably not even that large) but how can I tell for sure short
> of the part number clueing me in.  -Jeff
> 
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