I post here because googling this only returns a crapload of programmers and devices I have no interest in. (Amazing how suddenly Google went from a search engine to a publicity engine...)
I am wondering if any of you in your automotive electronics adventures ever came by a spec for the OBD-I protocol (at least I am pretty sure those years were OBD-I) used by the ECU in those GM's, as well as anything on the connector's pinout. I have a service manual buried somewhere, but my guess is the information I am looking for relative to the protocol itself will not be in there.
Any help or links would be greatly appreciated... ;)