Found a great pen to mark HP calculator cards

[John Garza (3665)]

Personally, I take a different approach as HP cards are no longer in production and will eventually become scarce. I create custom cards in MS Word for all my programs, and print to paper. I then enclose both front and back with 'Book Tape' (a thick clear tape), then cut out the cards with scissors, usually 20 or so to a page. What you have is the equivalent of the 'label cards' from the TI-58/59. They are non-magnetic but serve to annotate the user defined keys and title of the program. And they are MUCH easier on the eyes than my chicken-scratch handwriting. I keep the actual programs on unmarked (reusable) magnetic cards with the corresponding label card in the same sleeve in the card holder. Works great for me.

-J