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Path: utzoo!mnetor!seismo!rochester!ur-tut!ur-cvsvax!tim
From: tim@ur-cvsvax.UUCP (Tim Takahashi)
Newsgroups: rec.autos,rec.autos.tech,comp.misc
Subject: Re: '86 Camaro Computer System
Message-ID: <594@ur-cvsvax.UUCP>
Date: Mon, 4-May-87 22:40:18 EDT
Article-I.D.: ur-cvsva.594
Posted: Mon May  4 22:40:18 1987
Date-Received: Tue, 5-May-87 06:33:06 EDT
References: <5701@eddie.MIT.EDU>
Organization: Center for Visual Science, Univ. of Rochester
Lines: 24
Keywords: Rom listsings/Serial Data I/O
Summary: Computer Command Control
Xref: mnetor rec.autos:1903 rec.autos.tech:867 comp.misc:481

In article <5701@eddie.MIT.EDU>, shawn@eddie.MIT.EDU (Shawn F. Mckay) writes:
> 
> Howdy, I wonder if anyone can help me out, I have a 1986 Chevy Camaro,
> onboard it has a Computer system, of unknown type, I have made several
> attempts to get doc on it, but the most I can get is it's made by delco,
> I called delco and they said they used to give out full specs on the 
> system, rom listings, serial data stream info, and schematics on the ECM
> itself. However, they don't do that anymore...

	The GM Delco Computer Command Module is based on the Motorola
	6800 family microprocessor, a 6808 I think? The operating system
	is stored in approximately 32k of ROM. Much of this ROM is devoted
	to troubleshooting in case one of the inputs goes south, Throttle
	Position Sender, Outside Temperature, Manifold Vaccum, Oxygen
	Sensor, Engine RPM, Brakes Depressed, Air Conditining ON, Engine
	Coolant Temp. (Mass AirFlow is calculated from RPM, Vaccuum, Temp,
	and Throttle Position is some versions). Outputs that can also
	malfunction are handled in software; electronic injectors (fuel/air
	mixture), idle control air-valve, spark advance, purge charcoal
	cannister, open/close EGR valve, disengage Air Conditioner, etc.

	The programs are directly written in 6800 machine language, without
	a compiler and are very complicated, I wonder who knows how it
	really works.