What's this ECM?

[Mike]

GM. Looks like P4-family. Only two connectors - one 32 pins the other 24.
Silkscreen on the board has the number "34E973" on it. 4-layer PCB AFAICT
that looks "P4-ish".

MEMCAL is also P4-looking. PROM is marked "CRY 4382" and is, I think, a
27256. The MEMCAL doesn't have the knock module (if that's what the hybrid
module is) but does have 2 DIPs marked 16035010 and 16035011 which I'm
guessing are backup mode related.

Datecodes on the chips indicate its from maybe 1986 ot 1987 and some even
have date codes from late 1985.

I *think* it came from a 2.5L 4-cylinder car but aren't sure. So is this
some kind of mini P4? Or a precursor of the true P4? I mena, I think this
thing even uses the slow 160Hz ALDL protocol.


-----
 Mike