Magnetic Card Questions

[Kostas Kritsilas]

I have a number of magnetic cards (both Hp-65 and HP-67, and I know I can use blank HP-67 cards with the HP-65), and some of them are previously recorded ones by other people. I have a couple of questions, if anybody has the time:

1. The cards have writing on the top (non-magnetic)side. Some are in pencil, some in marker ink. I assume that I can just use a pencil eraser (any pencil eraser, or say, a Staedler white rubber one?) on the ones written in pencil. Is there a preferred method for removing the marker ink, or just don't bother because any solvent used will damage the magnetic side?

2. Because the cards are not write protected (i.e. corners not clipped), I can just overwrite the existing contents, right? Is the magnetic side adversely affected over time, as in no longer retaining magnetism? Can I overwrite previously recorded cards for the HP-67 on the HP-65, or vice versa?

Also, I have the pre-printed Standard packs for the HP-65 and HP-67, so I can use the HP-65 cards on the HP-67, right? Can I then write out the programs on an HP-67 and have the cards in HP-67 format? Or will the HP-67 just write the cards out in HP-65 format again? Idea is to get the programs onto a HP-41CX with its attached card reader.

Kosstas