Source for TI-59 Magnetic Cards

[Pjwum]

Be prepared to pay more for the cards than you did for the calculator. Usually they pop up as a set together with the black module cards.
That being said, are you sure your diagnostic test is written on a magnetic card? TI sold the 59 together with the so-called Master Library Module. Program 01 of this library module performs the diagnostic test. It is built in and needs no magnetic card reading. The accompanying card is black, just a label and non-magnetic.
TI's magnetic cards are yellow on the front with a brownish magnetic layer on the back.

Patrick