HP-48 FRAM Cards

[Dave Frederickson]

Thanks, Matthias, for those FRAM articles. The first article states that FRAM is good for >10^14 write cycles or >150,000 years of continuous data logging.

For FRAM71 owners, the chip used, a Cypress FM22L16, is good for more than a trillion read/write cycles and data retention is rated at 151 years (Really! Had to eek out that extra year to beat the competition with only 150 years.).

So FRAM's disadvantages are higher cost, lower densities than flash, and storage capacity limitations (according to Wikipedia).

(07-23-2016 12:03 AM)snrowe Wrote:  Cons:
-Fram memory has a destructive read mechanism, meaning it can only be read a finite amount of times ~(10^14) before the memory is trash.

Incorrect! A destructive read mechanism means that the data is lost when read and must be followed by a write operation to restore the data, like magnetic core memory. This has nothing to do with endurance.

Dave