I have some issues with memory cards, they can't seem to keep their contents (invalid memory), the batteries are new, and I've tried them in different calculators with the same outcome.

This is really a pity since they're now harder to find (someday I'll have to move my code to a 50g, eventually). Could it be that the contacts need to be cleaned, or would you recommend anything else?

Please note that I'm able to read/write on them, upon plugging/unplugging the serial cable, and or On-C (at times) or simply after a few minutes, they still lose their contents.

(Yes, I did PINIT, without any significant results).

Thanks.

You may want to post this at comp.sys.hp48.