[Diy_efi] checksums
David Cooley
n5xmt at bellsouth.net
Wed Dec 29 01:53:08 GMT 2004
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check out this link...=0D
Explains the checksum and engineering mode for the GM's:=0D
http://www.geocities.com/MotorCity/Shop/9938/bruce/prog_101.html =0D
=0D
-------Original Message-------=0D
=0D
From: David Cooley=0D
Date: 12/28/04 18:21:33=0D
To: A list for Do-It-Yourself EFI=0D
Subject: Re: [Diy_efi] checksums=0D
=0D
I can't remember where it is, but there is a byte to set in the chip for=20
Engineering mode" which disables the checksum check.=0D
=0D
=0D
-------Original Message-------=0D
=0D
From: -=0D
Date: 12/28/04 18:15:18=0D
To: diy_efi at diy-efi.org=0D
Subject: [Diy_efi] checksums=0D
=0D
Hi,=0D
=0D
I just wondered if checksums can be eliminated. I know there is a reason=0D
to use them, but when experimenting with chips, it would be nice to=0D
eliminate the checksum code with nops...=0D
your thoughts?=0D
and, how can one figure where to find the input data? like RPM sensing,=0D
MAF sensing, and so on. realtime logging would be just great for this=0D
and make it easy, but on older systems I doubt there is a way to do, or?=0D
Via OBD (I or II, I don't care, I just mean the OBD way :)=0D
=0D
tom=0D
=0D
=0D
_______________________________________________=0D
diy_efi mailing list=0D
diy_efi at diy-efi.org=0D
http://lists.diy-efi.org/mailman/listinfo/diy_efi=0D
=0D
=20
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<DIV>check out this link...</DIV>
<DIV>Explains the checksum and engineering mode for the GM's:</DIV>
<DIV><A href=3D"http://www.geocities.com/MotorCity/Shop/9938/bruce/prog_1=
01.html">http://www.geocities.com/MotorCity/Shop/9938/bruce/prog_101.html=
</A> </DIV>
<DIV> </DIV>
<DIV id=3DIncrediOriginalMessage><I>-------Original Message-------</I></D=
IV>
<DIV> </DIV>
<DIV id=3Dreceivestrings>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>From:</B></I> <A href=3D"m=
ailto:n5xmt at bellsouth.net">David Cooley</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Date:</B></I> 12/28/04 18:=
21:33</DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>To:</B></I> <A href=3D"mai=
lto:diy_efi at diy-efi.org">A list for Do-It-Yourself EFI</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Subject:</B></I> Re: [Diy_=
efi] checksums</DIV></DIV>
<DIV> </DIV>
<DIV>I can't remember where it is, but there is a byte to set in the chip=
for "Engineering mode" which disables the checksum check.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV id=3DIncrediOriginalMessage><I>-------Original Message-------</I></D=
IV>
<DIV> </DIV>
<DIV id=3Dreceivestrings>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>From:</B></I> <A href=3D"m=
ailto:titkoscim at maffia.hu">-</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Date:</B></I> 12/28/04 18:=
15:18</DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>To:</B></I> <A href=3D"mai=
lto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Subject:</B></I> [Diy_efi]=
checksums</DIV></DIV>
<DIV> </DIV>
<DIV>Hi,</DIV>
<DIV> </DIV>
<DIV>I just wondered if checksums can be eliminated. I know there is a re=
ason</DIV>
<DIV>to use them, but when experimenting with chips, it would be nice to<=
/DIV>
<DIV>eliminate the checksum code with nops...</DIV>
<DIV>your thoughts?</DIV>
<DIV>and, how can one figure where to find the input data? like RPM sensi=
ng,</DIV>
<DIV>MAF sensing, and so on. realtime logging would be just great for thi=
s</DIV>
<DIV>and make it easy, but on older systems I doubt there is a way to do,=
or?</DIV>
<DIV>Via OBD (I or II, I don't care, I just mean the OBD way :)</DIV>
<DIV> </DIV>
<DIV>tom</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>_______________________________________________</DIV>
<DIV>diy_efi mailing list</DIV>
<DIV><A href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A></DIV>
<DIV><A href=3D"http://lists.diy-efi.org/mailman/listinfo/diy_efi">http:/=
/lists.diy-efi.org/mailman/listinfo/diy_efi</A></DIV>
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