7730 addresses

[Ward]

The problem with the 7730 indentifer as applied to a particular EPROM is
that the GM template byte is the thing that tells you about the table and
algo code. 

The F & Y cars using this ECM have a code ID byte, $8D. 

Any EPROM used in the 7730 ECM that has a different ID byte will bee very
different as to the calibration and table placement. 

This is particulary true of the 7730, its probably used in more cars than
any ECM GM has ever made. The Calibration modules have different ckt's  for
different cars as well.

Ward


On Wed, 14 Jul 1999 16:37:10 EDT, EFISYSTEMS at aol.com wrote:

> Yes, true if the code is the same but GM tends to do things the same over
and 
> over so watch for similar looking tables at different addresses when the
code 
> is diff...hth's
> -Carl Summers
> 
> In a message dated 7/14/99 11:20:19 AM Pacific Daylight Time, 
> n5xmt at bellsouth.net writes:
> 
> << Subj:	 Re: 7730 addresses
>  Date:	7/14/99 11:20:19 AM Pacific Daylight Time
>  From:	n5xmt at bellsouth.net (David Cooley)
>  Sender:	owner-gmecm at esl.eng.ohio-state.edu
>  Reply-to:	gmecm at efi332.eng.ohio-state.edu
>  To:	gmecm at efi332.eng.ohio-state.edu
>  
>  At 01:55 PM 7/14/99 -0400, you wrote:
>  >Hi all:
>  >  I'm still plugging away at decoding all of the asm code for my 730.
>  >a while ago Ludis posted a partial io map for a P4 ( 0x4000 - 0x400c)
>  >
>  >  there is a bunch of activity in the 0x0000 to 0x0ofc are ( sram I
believe)
>  >any idea of the layout of that area?
>  >
>  >then again at 0x3FC2, 0x3FC8, 0x3FE0 and 0x5000 0x5013 and 0x501b
>  >
>  >man is asm listings ever long.. that last largish asm reverse
engineering
>  >
>  >while I'm bothering you all how accurate is the ecm guys mapping of the

>  >data areas
>  >and are the table in the same addresses between proms??
>  
>  
>  Pat,
>  The port IO map will be the same as a standard HC11F1...  The map Ludis 
>  posted I believe was at 0x4000 due to the PROM mapping in at 0x4000.
>  As to the tables being in the same locations between proms, if the CODE
is 
>  identical between proms, then yes... However, I've seen that GM likes to

>  play with the code (or has someone different write the code for each 
>  vehicle the P4 was used in!) so the tables don't necessarily correspond 
>  between different proms.
>   >>





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