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HP's expandable, RPN-based graphing calculator. Manufactured from 1990 until 2003.

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What is invalid card data

when the calculator is turned on ,invalid card data appears.i have the survey gx and the 512k gx cards

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Danny Haley , This info. from HP support. The message Invalid card data appears when the calculator is not able to properly read data on the plug-in card. The card may not be correctly installed, or it may not be initialized. The trouble shooting link#1 below describes how to resolve this. Link #2 also has info. to share. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

http://support.hp.com/us-en/document/bpi...

http://news.numlock.ch/it/hp-48g-how-to-...

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