EEPROM dump data extraction help

Dear all.

I have an EEPROM dump off of a AMD AM29F400B EEPROM, used in an electronic control unit, which is "mated" to another control unit by a number. In this case, the number is "675407". In the interest of moving the first control unit to another system, with a different number, I need to be able to change this number in the EEPROM.

The problem is I have no idea how the data in the EEPROM was encoded. If anyone would like to help me find the address of this number, the hex file is at

I would greatly appreciate any suggestions on what to look for, or how to interpret the data. If it helps, the ECU was made by Siemens, around

Jacob

can you get a dump from another eeprom and than compare the files? I looked at the hexfile and don't see anything obvious. was this an 8080 cpu? rw

The problem with comparing the two eeproms is that there is a lot of the same things in both. However, I am pretty sure that it is between adresses 6000 and 7800 DEC, by comparing the files.

I am not sure of the cpu. Does it matter? If so I can find out.

with a good hexeditor you can compare both hexfiles and highlite the differences between them. I got an editor lets you load x hexfiles, only limited by your cmptrs memory size. the program does not appear be running on a 8080/z80, looks like F8 code to me, (Fairchild F8) or could be National SCMP??? rw