[Diy_efi] Re: Motronic checksum

glogovacs at yahoo.co.uk glogovacs at yahoo.co.uk
Fri Jun 11 00:06:34 GMT 2004

Yes, I have an EPROM programmer... but all the software can do is calculate 
the additive checksum of the bin file. Now, a question - is it enough to 
have additive checksum corrected to stock, to have bin file 'approved' and 
running? I;ve read somewhere that Motronic makes XOR checksum as well.. is 
that true?

ECUs I am talking about have 27256 EPROMs... since they are considerably 
larger than 2732 chips used in older Motronic boxes, can I consider I am 
having post '88 units?

With regards,

>Date: Wed, 9 Jun 2004 16:41:39 -0700
>From: "FR Wilk" <kd694j0538f at hotmail.com>
>Subject: Re: [Diy_efi] Motronic checksum
>To: "A list for Do-It-Yourself EFI" <diy_efi at diy-efi.org>
>Message-ID: <BAY15-DAV2kRQq5xVz500039359 at hotmail.com>
>Content-Type: text/plain;       charset="iso-8859-1"
>Do you have a EPROM programmer? The software that comes with it will do the
>checksum correctly.
>You have another problem. Half the code is stored in the 8051. You have to
>download that before you can try a disassembler.
>In about 88, BOSCH started putting the whole code into the EPROMs and wiring
>the 8051 to ignore its internal memory. This will save you from trying to
>download an 8051's ROM.
>FR Wilk

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