DIY_EFI Digest V2 #261

[Terry Martin]

Land Shark wrote:
> >       Ok so it has been said through the group that a prom can be read..
> >       (great) now can some one show me what some different tables look like???

> >       how easy is it to pick out the tables in the hex dump...
> >       I have some hex dumps but can't seem to notice any tables??
> 
>    If someone will show ME.. I will include GM capability in my
>    working Chip Editor.. It is designed for Bosch Motronic, but
>    also modular so it can do more..
> 
>    Jim

What you are asking for is only available via a straight out power hack
on the ECM/PCM/OBC depending on who you're talking to. The only other
way I know of (other than inside information), is to pay an aftermarket
supplier who has already acquired the bitmap, download the data, buy a
custom burned chip with specific data altered, and run a verify with
failure address flagged, and the guess the flags by running a test
mill/PCM arrangement and determining what's what by sequentially
altering the flags, ie EEPROM with programmer to modify data
arrangement. This is not simple stuff. The hack takes more programming
than the original program data, and requires custom built hardware. It's
not feasible unless there's a pay-off. 

Terry