assmeblers and disassemblers

[goflo at pacbell.net]

MrCad472 at aol.com wrote:
> 
>    I have the idea now of what the assemblers and disassemblers are, but now I
> guess I just need to learn how these computers actually operate, how to change
> the programming, etc. Is there somewhere I can get a book on this? Any help
> would be appreciated.

You need to identify the processor your ECU uses, and then obtain the
appropriate data books & software. 
"Microcomputer Primer", by Mitchell Waite is good, but out of print.
Perhaps others can recommend something.

Regards, Jack