What's this chip in my 87's brain?

[atc_marty]

I opened up the brain in my 911 to find a chip that looks aftermarket. ST is a company that still exists, but I can't find any mention of this chip on their website. I search for all the combinations of numbers that appear on the chip and still no dice. Does anyone know what I'm dealing with here?

[Scooter]

Some kind of 24 pin performance chip.

[ganun]

Look for the sticker that fell off. I foung the super old Autothority sticker loose inside the ecu. Similar looking chip but 28 pin in my 87.

[jrumiano]

Be careful, if exposed long enough to direct sunlight or an intense UV light EPROMS can be erased. You want a sticker or something covering the glass window on the chip while you have the ECU cover off.

[atc_marty]

So perhaps ST just manufactured this chip for another company like Autothority? That makes sense. In any case, I'm going to replace it with a Steve Wong over the winter. Thanks for the tip about the sticker jrumiano, I had no idea!

[SoCalSK8r]

Yes- ST is the manufacturer. ST microectronics.

[Chuck.H]

it is (or was) a very common 2732 EPROM (erasable programmable read only memory). 32k bits = 4k bytes. Later DME's use 8k EPROM's that are 28 pin devices.

This EPROM, along with some memory inside the 8051 CPU, holds the software code + data that run the engine. The later 8k chips hold it all in one place. Earlier boards can be converted to 8k boards. There is a site, I think FR Wilk? that has a lot of DME information, worth reading.

Chuck.H
'89 TurboLookTarga, 369k miles, lots of custom DME software.

[RWebb]

That is a NSA tracking chip.