Magnetic Card Questions

[Erik-M]

On the HP-41 you can set flag 14 to overwrite clipped write protected cards.
After writing the flag is cleared automatically.
Handy in case you want to reuse old cards or update programs.
I never had a card that was unreadable because of age ( all > 30 years) but you can also refresh old cards this way.

I discovered already long time ago that removing ink is impossible without also removing the white layer on he cards. Removing simple pencil text is no problem