ECM 1227748, creating a new ECU file?

[Romans, Mark]

Nick:  Buy an editor and be set.
Terryk at foothill.net sells GMe that edits YOUR exact eprom tables.
There are other people selling editors too.  tunercat, etc.
Mark
----- Original Message -----
From: "Nick McAlpin" <nmcalpin at quiknet.com>
To: <gmecm at diy-efi.org>
Sent: Monday, February 19, 2001 6:21 PM
Subject: ECM 1227748, creating a new ECU file?


> What does it take to make a new ECU file from scratch?
>
> I'm the one with an 88 coupe who got some help from the list over
> the past few days (thanks all!) and i am interested in working with
> the EPROM code/tables a little bit but being a less common ECM,
> the ECU doesn't seem to exist.
>
> So, my question, is building an ECU really not much more than
> looking through the bits of the .BIN, identifying tables purely by
> pattern and then playing with them to find out what they do?  what
> about single byte memory spots - do you guys just change the
> value one byte at a time to find out what it does?
>
> is there any standardization in the table formats of ECM's?  For ex.
> if I find a table of size X columns and Y rows that it is probably
> table Z?  or is every ECM/bin different.
>
> It seems like if I have to start from total scratch, I could end up
> burning 1000's of EPROMS and doing a lot of guesswork (and hope
> not to break anything in the meantime?)
>
> thanks! nick
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