Rich,
what kind of cal constants are you referring to?
- Calibration kit constants as well as power probe tables?
- Calibration data for the 8753 HW?
I think the answers are.
- NVRAM, i.e. the battery backed DRAM. The internal drive data is also here.
- EEPROM
A friendly tip: It might be easier to follow your efforts and provide help, if you avoided starting new threads with lacking context each time you have a new question. Although I see a point of starting a new thread for a new question.
Best regards
Marcus