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Tds cogo card for hp 48GX calculator
TDS GX/SX COGO Card for HP 48GX Calculator. Includes original TDS COGO 48 User's Manual and Overlay. Made by Tripod Data Systems, Inc. Just install this card in port 1 of the calculator, type (alpha alpha TDSCOGO then Enter) and software is ready to use. The card is tested and works great. Guaranteed in working condition. S/H $5.95.