'89 Firebird ECM PROM

[John Hess]

It is, in fact, a 27C128S.  This is a common 128K (bit) EPROM.


>----------
>From: 	Terry Martin[SMTP:terry_martin at mindlink.bc.ca]
>Sent: 	Sunday, June 22, 1997 4:02 PM
>To: 	diy_efi at coulomb.eng.ohio-state.edu
>Subject: 	'89 Firebird ECM PROM
>
>I got a ECM out of a '89 Firebird Trans Am GTA. I pulled the following
>number out of the PROM by looking through the quartz window with a
>microscope:
>
>(M)1984 TI
> 27C128A   ....could be 27C12HH, or some variation of the last two
>digits. 
>
>Question: Is this the right PROM for the ECM that's supposed to be in
>this type of vehicle? I have not found a reference to the numbers that
>would indicate it's a 8051 or 8065, etc. 
>
>Alternatively, can someone confirm the manufacturer and # of the PROM?
>
>Thanks much,
>Terry
>