Ang: Re: Ang: RE: [Gmecm] New ROM-code in a 1227747?

[Per Lonnborg]

That was interesting info!

I was just wondering what that connector was intended for when I had my ECU apart yesterday. Just for make 
sure, I hace a pic on my ECU at http://www.lanechoice.net/P/EFI/mail/1227747_ecm.jpg that must be the connector to the far left you are 
referring to?

I am afraid I do not have the skills to investigate that possibility, but it would be nice to hear if someone else has tried 
this??

I will browse the diy-archives as well to see if I can find something about this.

/Per

>----Ursprungligt meddelande----
>Fr?n: 
rwhughe at oplink.net
>Datum: 2005-nov-28 07:10
>Till: <gmecm at diy-efi.org>
>?rende: Re:Ang: Re: Ang: RE: [Gmecm] New ROM-code in a 1227747?
>
>> with the ROM inside the CPU I see the difficulties.
>> Thanks for clearing that out for me.
>> 
>> /Per
>
>The later P4 ecms have all 
the software in the removable prom, the 
>earlier C3 ecms have onboard ROM, don't know which type the 7747 is. 
>Ludis's "spit" routines 
are intended to dump the onboard non-removable 
>ROM of the C3. The hidden connector at the other end of the ecm has all 
>the bus signals 
and something called "ROMEN" which would suggest you 
>could dump the onboard ROM, program it into an external PROM and connect 
>it with 
the proper addressing logic to this connector and then use the 
>ROMEN signal to disable the onboard ROM. If this works (I haven't tried 
>it) you could then modify any part of the software.
>-- 
>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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