Not only battery backed up SRAM but EEPROM config data has problems. I'm a
bit of a mass nut and have seen lots of old precision balances (i.e. Sartorious
and Mettler) that used first gen serial EEPROMs to save their cal/config data.
Lots of these are going senile. I had to build programmers for the SDA2006
and MCM2801 (?) chips since no commercial programmers support them. They
require 3 or 4 different voltages to program.
Whenever I get in a scale I dump the old eeprom and rewrite it. If the old
eeprom already croaked, I use a backup dump from a different scale.
Sometimes that causes issues if the scale has an internal cal weight that was
calibrated at the factory... then one gets to try and adjust the internal cal
weight to match the weight specified in backup device data.
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