fx-9860gii-2 brief introduction

[Mjim]

Hlib, did you happen to record the part number of the flash chip used in your fx-9860GII during the tear down?

One of the things that impressed me about the fx-9750GII is the presence of a very high endurance (1,000,000 cycle, 20 year retention) 4MB, 0.13 micrometer process, flash memory chip; the spansion S29JL032H. I'm interested to know whether they changed the chip for the second generation fx-9860GII (since my fx-9750GII is basically the first generation).

While the newer fx-CG50 has more storage (32MB, 0.065 micrometer process), it looks like it suffers by a factor of 10 in terms of endurance (100,000 cycles endurance):
https://www.hpmuseum.org/forum/thread-75...l#pid97225

I don't know if Casio uses any wear leveling for their OS, but it could be possible the fx-CG50 might be better off on account that more space is reserved for backing up the contents of RAM to flash on power down, or it could be worse off if it simply rewrites the same sector of flash memory.