Dumping a Mistubishi ECU

[Barry E. King]

TechTom in Japan makes several products that will do this but they are
spendy ranging from $1650-6500 USD.  It would be worth it if one was to get
serious about mofifying various ECUs or were racing nad needed that level of
control but not for someone just wanting to understand what their ECU is
doing.  TechTom also has daughtercards for various applications that replace
the ECU ROM with standard 27xx EPROMs.  The ECU is resused on the
daughtercard. They too are pricey at $365 a pop.

I also found lots of information about the 7700 series but nothing that
would help dump the ROM contents short of purchasing an expensive
programmer.


Barry

> -----Original Message-----

> I have what seems to be the same unit (from a geo tracker). I've thoufht
> about the same thing, and done what looks like the same research (I found
> the disassembler anyway).
>
> I found no specs on the ROM.
>
> The MELPS 7700 family seems to be a microcontroller version of the 6502.
> Assemblers, a C compiler, and even a complete integrated
> development system
> are available.
>
> One normal method of getting a dump is to substitute a chunk of code I've
> seen called a "code spitter" program, then monitor address and data lines
> with a logic analyzer. To do this, you have to remove the ROM from the
> board (my PLCC is soldered in). I do not know enough about the peripherals
> used, or the memory map, and the board has what appear to be proprietary
> composite devices all over it.
>
> The bottom line is "I gave up". It'd be easier to rebuild the
> system around
> a '7747...