Need help: power programming eprom

[JTesta1966 at aol.com]

In a message dated 4/30/00 9:04:33 PM Eastern Daylight Time, 
red93formula at hotmail.com writes:

<<  am having a problem getting my car's computer to "accept an eprom".
 If I put the exact same program into an eprom that was in my original chip 
 it works fine, but as soon as I change any data, the car's computer chokes 
 on it and goes into "limp home mode" when the service engine light stays on 
 and my diacom won't communicate. Is there some step I am missing?  Do you 
 have to change some kind of check sum on the eprom for the computer to 
 recognize a change or something?
  >>

Yes, you have a checksum problem.

Go to www.hexworkshop.com, dl hexworkshop (or use hatever you like, HW calcs 
checksum for you so its nice and easy) Make the applicable changes in your 
chip, 00 the 2 checksum bytes/bits whatever....edit ->"select all" then tools 
-> generate checksum (Checksum16)...put the resulting checksum in the spots 
you 0'd. Then burn it.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jim Testa                                         TType86 on #BuickGN
jtesta1966 at aol.com                               buick.fiendish.net:6667
ASE Master Technician            NJ Lic. Motor Vehicle Inspector
L1 Adv Eng Perf Certified     NJ Licensed Emissions repair Tech
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