747 checksum

[Programmer]

0byte 1 byte 2 byte 3 byte 4 byte
   1         2         3          4         5th

Is it not called the 5th byte ??

Lyndon.

-----Original Message-----
From: Programmer <nwester at eidnet.org>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: July 27, 2000 4:46 PM
Subject: Re: 747 checksum


I add from the 5th byte...all 7747 ECM's

-----Original Message-----
From: Niinikoski, Juha <Juha.Niinikoski at mikrolog.fi>
To: 'gmecm at diy-efi.org' <gmecm at diy-efi.org>
Date: July 27, 2000 1:34 AM
Subject: RE: 747 checksum




> -----Original Message-----
> From: Programmer [SMTP:nwester at eidnet.org]
> Sent: 27. heinäkuuta 2000 6:46
> To: gmecm at diy-efi.org
> Subject: Re:  747 Rom Emulator / status
>
> Cool---looking forward to it. Some GM c'sums are added right after the ID
> byte--other older ones are
> calc'd right after the checksum bytes...Programming 101 is correct for
> that
> type of PROM--and I do believe
> that's what is stated in the text.
> Lyndon.
>
>
What I managed to find out 747 rom (fixed part of code) start
calibration rom checksum calculation from fourth byte, not immediately after
checksum. If your claim is true there are different kind of 747 boxes
around. Is this true ?

Juha

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