New Never Used HP41CV ?

[Allen]

(12-29-2023 05:53 PM)jftman Wrote:  1) Why after removing the batteries on a 41Cv does the stack register maintain data?
1A) How is continuous memory, in that respect possible, without a battery for any time period?
2) That therefore says the chips are turned on, and retain their state?
3) Is this volatile or nonvolatle memory?
4) Then do these chips have a cycle life? Like a USB drive would, after millions of switching?

1) Good capacitors and VERY low standby current
1A) Good capacitors and VERY low standby current
2) They are not technically "ON" it's probably in low power mode. I don't have the exact measurements, but on the order of a few micro-amps for this kind of chip is not uncommon.
3) definitely volatile, if you tried to wake the calculator while the batteries were out, it would very likely erase any temporary memory
4) The plastic case, battery terminals, internal posts, motherboard connector and LCD will probably all fail long before any cycling issue with the memory chips. I'm sure they do go bad from time to time, but less common than the other issues we see across the HP41 NUT series.