OEM EFI computers

[David Cooley]

>
>Has anyone taken an old OEM EFI computer and modified for his own use?  I'm 
>thinking about all of the EFI computers that must be out there on cars that 
>are junked.  For example, I believe that Chrysler's use the 68HC11.  There 
>must be thousands of these out on the road by now, with some available from 
>junk yards for relatively low $$$.  Assuming that the firmware is stored in 
>external ROM, it would be relatively easy to re-program.  BZ
>
>Bryan Zublin
>General Instrument, San Diego, CA, USA
>bzublin at po2.gi.com
>
>
Bryan,
There are also masked roms in the OEM ECM's (at least GM.. Don't know about
others) That also control what it can and cannot do.  The replaceable Eprom
of a GM (Chryslers are sealed and potted) contains the program (firmware)
and look-up tables that control the individual functions... Also, just by
changing 2 chips in a GM.. The Calpack and the Eprom, it can be used on a
variety of engines.  If interested, I have a 32k file of the Eprom of a 1987
buick GN (turbo 3.8l V6) disassembled I can send you to examine... They use
the 6801.
Later,
Dave
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David Cooley  AKA N5XMT                      Fax: (919) 319-2896       
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