749 inna 730

[Terry/Carol Kelley]

Hi Andy,

I loaded the 749 code into the upper 16k of the 32K eprom. It ran.

The 749 is a 16k eprom, the 7730 is a 32k prom. The 68HC11 processor expects
the restart vector (where do I start running code?) at FFFE and FFFF. So the
16k of code needs to be loaded in the upper 16k so the restart vector is in
the right place.

The 749 has KNUMCYL for the number of cylinders, but from the wiring
diagrams, it doesn't use Cylinder Select (this is the grounding or floating
of an ECM input line). Cylinder Select is a wiring pneumonic, and KNUMCYL is
a software pneumonic.

Terry Kelley

terryk at foothill.net

1986 Olds Ciera GT 3800 Supercharged

-----Original Message-----
From: andy quaas <realsquash at yahoo.com>
To: gmecm at esl.eng.ohio-state.edu <gmecm at esl.eng.ohio-state.edu>
Date: Wednesday, March 31, 1999 5:04 PM
Subject: Re: 749 inna 730


>
>--- Walter Sherwin <wsherwin at idirect.com> wrote:
>> >The answer is in the archives,
>> >and if you haven't bought a 730 why not just use a
>> 749?.
>> >Bruce
>> >
>
>The answer is in the archives, eh?  Well i have looked so many times
>that i know everything in the damned archives!  You, Bruce, stated that
>you got a 749 cal to work in a 7730 and would post the changes nessesary
>to make it work.  I searched a lot to try and find this information, but
>i didn't.  Can you please tell me the subject that you used so i can
>search for it?
>
>I found NO information in the archives that give any useful information
>on this subject.
>
>So if you ahve anything to offer, please do.  All i need is a little
>confidence that this will work well and i will go out and spend the
>money and do it.  I don't want to just jump into it with the attitude of
>"Oh it'll just work.  I'll figure out a way" without any data to support
>the theory.
>
>Andy
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