HP 67 magnetic card not working

[teenix]

(12-06-2019 03:55 AM)Trond Wrote:  I recently bought the HP 67 Stat Pac, which was looking very good as I was hoping to do the Student's t-test, and realized that at least one of the cards is not working; the t-statistic card (sigh). Side 2 seems to read correctly but not side 1, so it is in fairly good shape and perhaps just slightly "off". I suppose I could type it in by hand using the book, but is there a way to "revive" old and worn magnetic cards?

You would have to add some stiff material to the card where it was cut. I think there is info in the Forum somewhere.

Another option, if you feel confident, is to short the Write Protect Switch connector pin on the CPU board to ground.

Counting from right to left looking down at the CPU board with pins at bottom, WPS is pin 15, ground is on pins 27 and 28 (the two most left pins).

This will override the write protect mechanism and you can re-write a write protected card.

cheers

Tony