[Gmecm] What really is a 'mask'?

Jared Ryan jryan
Mon Sep 4 19:43:55 UTC 2006


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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