What was the Old VIN and the new VIN?
What was the Old and New Part Numbers and Serial Numbers?
Did you happen to capture the hex/ascii screens, or the hex files for both versions of eeprom (before and after making changes)?
Coulomb may be able to help decode if this is some sort of checksum, CRC field, parity, etc.
Unused bytes are Blank (x00)
It appears to be using a 32-byte page with the CS in the last 2 bytes of the page.
Here is data from Stan051 eeprom starting @ address x0800
VIN in ASCII: VF71NZKZZBU901984
Hex representation: 56 46 37 31 4E 5A 4B 5A 5A 42 55 39 30 31 39 38 34
last 2 hex bytes CS?: 8B F0
VIN search returned as 2011 Citroen CZero
Here is Bezzeb data from screenshot same address
VIN in ASCII: VF31NZKZZBU801988
Hex representation: 56 46 33 31 4E 5A 4B 5A 5A 42 55 38 30 31 39 38 38
last 2 hex bytes CS?: 8B F1
VIN search returned as 2011 Peugeot iOn
Bezzeb MCU Part Number and Serial Number data starting @address x0A02
PN and SN ASCII string: 9499A620 CF1101004920
Hex representation: 39 34 39 39 41 36 32 30 20 20 43 46 31 31 30 31 30 30 34 39 32 30
last 2 hex bytes CS?: BE CB
i tried several online checksum and CRC calculators but had no success matching the codes.
Does anyone know the vendor of the eeprom? U6 on my board is etched somewhat but i can read "L64" on the first line, with an unusually large circle at pin 1, followed by "2071".
Microchip makes a 24LC64 that comes erased with all locations filled with 'FF' and a 32-byte page buffer. ONsemi has a similar device, as does Atmel, Catalyst, Fairchild, Philips, Rohm, ST, Xicor.
[edit: i think it is a Rohm device, BR24L64]
Also there are I2C and SPI versions of serial eeproms--which is used here?
[edit: Looking at the board it seems I2C since pins 1-4 are all connected to Gnd, so can't be SPI version]
The reason i bring this up is because the data shows the unused locations with blanks, x00. So did they come that way or were they cleared when programmed?
Also the eeprom used in the CMU boards seems to have a common part number but only the vendor datasheet has the correct information for pins and programming. So there may be subtle differences to be aware.
kiev = kenny's innovative electric vehicle