Great working Sparcom General Chemistry Application Card (Version 2.5) for HP 48 GX / 48SX Calculators. Just install card in port 1 of the calculator, press left green arrow shift key (right orange arrow shift key for 48SX) then press Library key and program is ready to use. The calculator is not included - only to show software installed. Guaranteed working condition. Free shipping in USA.  
eBay