HP 82211A Solve Equation Library Card for HP 48GX / 48SX Calculatorsfor HP 48GX / 48SX Calculators. Just install card in port 1 of the calculator,  press right arrow green shift key (orange shift key for 48SX) then Library key to install and software is ready to use. Tested and works great. There is some glue residue shown on the top plastic pull tab. Guaranteed in working condition. S/H $6.80.
 
 
 

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