eeprom 93c66 & 93c86

[mariusz971]

Hi, somebody can tell me if the 93c66 & 93c86 they use the same address? can I read c66 and write in c86? I know that the difference is in byte but I need to know if they use the same address

93c46 - a 128 byte eeprom

93c66 - a 512 byte eeprom (and 93c56 - a 256 byte eeprom)

93c86 - a 2048 byte eeprom (and 93c76 - a 1024 byte eeprom)

Thank you

[Zmann]

Didn't remember much the datasheets for these eeproms so can't tell exactly. Only remember that these microwire chip can be devided into two groups, c46, c56 & c66 and c76 & c86. The chip in the same group can be replaced with the one bigger if need but can't be across the groups.

Test by writing c66-size dump on c86 chip of its own menu then read back by c66 menu. Hope this help a bit.

[hcip]

93C46 not the same reading to 93C56 menu

93C56 = The same reading with menu 93C66 but only half in size(it can read/write vice versa)

93C76 = 93C86 = The same reading with menu 93C86 but also half in size(it can read/write vice versa)

[martij976]

I would say: Don't play with that.. They may have same address tho.. but it's not necessary to find out... i guess..

[mariusz971]

ok, I tried to write dump from c66 to c86 and it doesn't work. My problem is that I changed instrument cluster in Freightliner M2-106 (medium heavy duty truck) and I can't correct the mileage beacause the old cluster use c66 and the new one use c86 so I can't read the dump from old eeprom and write in new one. Maybe somebody of you knows where is the mileage address in hex? the original mileage is 503024km
thank you

[Zmann]

93C46 not the same reading to 93C56 menu

Yes, that was my mistake on 93C46.