[Diy_efi] Lucas Hotwire checksums

[Mike V]

At 06:07 PM 7/26/2004 +1000, you wrote:
>Hello to all as I have just joined this list. I am a computer programmer 
>and ex-mechanic who is currently adapting the Rover Lucas Hotwire ECU 
>(14CUX with what appears to be a ZC93116CP Motorola processor) for use in 
>an old series 3 Land Rover. I have built an EPROM emulator and have 
>written simple software to allow me to edit the fuel maps successfully.My 
>problem is that when I 'burn' a chip (m27c256b) and install it I am 
>getting 'ROM memory error' when the car is run. The vehicle runs OK but 
>occasionally plays up after the error is thrown. I am sure this is a 
>checksum error and know that it is likely that the algorithm to calculate 
>it is proprietary. Does anyone have any information regarding this.

If you don't find the answer you're looking for, maybe pick a place
in the fuel table that you'll never reach, and make "ballancing" entries
there, so that your sum total doesn't change.  You know, that corner
  of the table that represents closed throttle and 6,000 RPM.  <grin>
MIke V

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