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.
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