How to test memory in an HP48 RAM card

[mfleming]

(01-27-2021 09:39 PM)Jonathan Busby Wrote:  The reason I hadn't considered MRAM is because all the devices I had investigated ( up until now ) either had too high operating currents or had a huge startup current. The one to which you linked has a maximum write current of 30mA, which is quite high on the HP48GX, but, I think it's not a problem.

The chip will spend a significant part of its time in the quiescent state (10 uA) even when the 48 is using it, so average power consumption won't be bad. Have a nice reservoir cap across its rails, and put me on the order list