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The Design and Implementation of the IC Card Read-Write Device Based on 89C51OAbstract:This paper has introduces the designing of a new type IC card reda-write terminal mainly. The terminal is a MCU embedded application system. First of all, proceeding with the International Standard of IC cards ,the paper has introduced the reading and writing technique of IC card data. On the base of SLFA442-a kind of Smart Card with Security of Logic made by SIEMENS , the paper has specified the software and hardware realization of IC card data reading and writing