Disassembly

[Ken Kelly]

Dave,
	See you got the AN1060. I found a faxback # for the AN1010.
Let me find that for you.

	Sounds like you can now read 64 byte blocks of memory, but
is that Ram or EEProm? How would you determine which ROM is
being read. Does the command have an start address? If it
does is the range greater that 64K?

	If I new my Vin I could search for that string in my
EEprom. Might look for a valid VIN tonight. They have a
pretty standard format.

		Ken

DAVE_HEMPSTEAD at HP-Andover-om3.om.hp.com wrote:
> 
> Hi everyone,
>     I learned a couple of things this weekend about my 95 ECM.  First thanks to
> whoever posted the document of the P4 system.  Very interesting reading.
> 
>     My 95 also supports command modes 2 (read out a block of 64 bytes of
> memory), command mode 3 (read out up to 8 individual addresses in memory) and
> command mode C.
> 
>     I found that command mode C lets you program your VIN and END MODEL number
> (what ever that is).  The format for command C is:
>       0xF4, length, 0x0C, 0x01, 17 byte VIN, cksum
> or    0xF4, length, 0x0C, 0x02, 4 byte End Model, cksum
> 
>     Note that for '95, the messages start with an 0xF4.
> 
>     I did check command mode 4 and 5.  They do write to ram locations, and
> according to the document, sets engine parms to your sent values.
> 
>     I believe that 94's and 95's are the same.
>     I have not been able to find the Motorola App Note AN1010 (I did find 1060).
>  Can anyone point me to it?
> 
>     Can someone explain to me what technology is used to store the VIN in the
> ECM?  Is it EEPROM???
> 
> Thanks,
> Dave Hempstead