programming 101 and checksum

[Vance Rose]

At 07:01 AM 8/9/98 -0400, you wrote:
>
>-----Original Message-----
>From: Shannen Durphey <Shannen at mcn.net>
>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>Date: Sunday, August 09, 1998 3:13 AM
>Subject: programming 101 and checksum
>
>
>>Memory location 0x004 is listed as the checksum enable for
>>7747 ecm. This value is $42 in my factory files.  Does
>>anyone know what the value is to disable checksum? 
>
>AA
>
> Also,
>>this location in 8747 ecm contains the value $4F.  Is it
>>safe to assume this is checksum enable for this ecm?
>
>I don't know, could try a chip with AA entry and see
>
>Bruce
>
>>Thanks 
>>
>>Shannen
>>
>
>Hi All

	If ya have time - just disassemble code. The checksum is usually early in
program section. Being a novice it was one of my first finds for 165 ecm.


Vance