Re: Checksum questions

["TK" <terryk@foothill.net>]

The burner checksum will not match the checksum in the eprom. The ECM does
not include the checksum (and sometimes some other) bytes in the checksum
calculation (recursion). Otherwise it would keep changing.

So don't try to match them. I ignore the burners checksum.

Terry

----- Original Message -----
From: Bob Valentine <bob@tecmark.com>
To: <gmecm@diy-efi.org>
Sent: Saturday, March 25, 2000 1:01 PM
Subject: Checksum questions


> I'm trying to burn a straight (unchanged, as downloaded) copy of ANHT to
> work with along with the anht_hac.  I'm having problems figuring the right
> checksum. My reference point is the anht_hac listing, which has a checksum
> of DAA5 at $0006 which I assume is correct.
>
> >From $0000 to $7fff the checksum is E10C.   Took a guess by looking at
> where the data is in the buffer, and the checksum from $3000 to $715F is
> DAF6, which is close.  $0000 to $0987 is FEBB, way off.
>
> I looked at the 7730v3.ecu file, and it says the checksum end address is
> 7fff. This is my first-ever attempt at burning, so what did I miss?  I set
> the device type to 27C256.
>
> -> Bob Valentine
> -> bob@tecmark.com
>
>
>
>
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