GM PROM identification after the silver sticker has been remo ved?

[Craig Marcho]

> I assume you are trying to figure what type of EPROM you have.  If so,
> look for the GM part number.  These are the common numbers:
> 
>  32500 or 16032500 : 2732
>  26403 or 16026403 : TMS2532
>  69300 or 16069300 : 27128
>  (69300 or 16069300) and 5012 : 27256 used as a 27128 (usually)
>  045915 or 16045915 : 27256
>  67633 or 16067633 : 27512

Great info Ludis!

Question:

I've got a chip that was from an '86 Corvette.... has these markings:

DELCO
40581
E 5012A
L6020078S

What is that one?

Also have the 69300 with 5012A on there... should be a 27512 right?

Thanks!

Craig M.
 
> 
> This'll get you close - you'll need to try retrieving the silicon
> signature to figure out the exact variation of PROM.  I've encountered
> just a few 2732's and 27128's which used a different (older) part number.
> 
> 
> If you have MEMCALs with erased PROMs, and you need to find out the
> application, the 16+14 pin DIPs and the letter code in the ESC module
> will steer you toward the application.
> 
> -- 
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
> 
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