[Gmecm] What really is a 'mask'?

[DV Fagan]

Jared,
Tire size and gear ratio are handled by a device
called a DRAC.  It is a little board wrapped in foam
adjacent to the ECM.  It divides tailshaft RPM by a
jumper selected code to generate speedometer drive and
VSS to the computer.
Dennis

--- Jared Ryan <jryan at caminofx.org> wrote:

> Are such things as the gear ratio and tire size
> stored in the ROM 
> (calpack?) of a C3 ECM?  I don't see any mention of
> them in the PROM 
> tables.  I'm referencing specifically the 1227747
> and 1228746.
> 
>   ---> Jared Ryan <---
> jryan at caminofx.org | http://www.caminofx.org
> 
>   -- from Houston, TX as well.
> 
> On Sep 4, 2006, at 2:33 PM, Robert W Hughes wrote:
> 
> > The warly C3 ECMs had most of the software in an
> on board ROM (mask 
> > programmed) with some small parts in the removable
> PROM along with the 
> > calibration parameters. There were links in the
> ROM down to the PROM 
> > to execute the extra routines.
> > -- 
> > Robert W. Hughes (Bob)
> > BackYard Engineering
> > 29:40.237N, 95:28.726W or perhaps 30:55.265N,
> 95:20.590W
> > Houston, Texas "The city with too much Oxygen"
> > rwhughe at oplink.net
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