Re: Diacom Help

[Roger Heflin <rah@horizon.hit.net>]

On Thu, 11 May 2000, Dave Zug. wrote:

> 
> > The diacom gdf file is pretty much the format that comes straight from
> > the GM ALDL data stream.  I have been able to decode it using the
> > assumption that it is the same as the standard data stream.
> 
> That may be enough reason for nothing to be offered.
> 
> >
> > This also means that the data stream is different for almost every
> > vehicle+computer combination, so making the above is much more
> > difficult that it appears.
> >
> 
> Nope. exactly as difficult as it appeared *to me*  ;-) but time consuming
> yes. if *I* were doing it, I'd stick to the cars I own ;-)
>
I would stick to cars I own too.
 
> I can't imagine that diacom supports ALL of these combo's.. probably the
> most common, worthwhile, or ALL if the formats were cut and paste for the
> developer (formats bought from manufacturer).. which would qualify as *hard
> work* or *expensive to the project* and thus never given away..
> understandably so.

I suspect the format data specs were bought.   I also suspect that if
the program was written correctly you would be able to describe an
entire data stream for a given vehicle in a fairly small amount of
bytes, I bet there is alot common with what is in the datastream, but
how many codes there are and exactly where they are is probably what
GM changes more.  I know diacom does not display all of the data that
is actually in the data stream.  It does not (on my car) display
things such as the current tranny gear, but I have gotten it from the
datastream by directly checking the diacom data file.

			Roger

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