Abstract: In an IC card reader/writer of the present invention including a control section for controlling a power supply to a detachable IC card, a supply of an operation clock, a reset thereof, and an I/O branch section for receiving/transmitting serial data from/to the IC card, wherein a signal is received/transmitted between a personal computer and the control section and data is received/transmitted between the personal computer and the I/O branch section, the IC card reader/writer comprises a serial-parallel converter for mutually converting serial data receiving/transmitting from/to the IC card and parallel data receiving/transmitting from/to the personal computer, an access control section connected to the personal computer by an address bus and a control signal line, an IC card data port and a status port both connected to the personal computer by a data bus and connected to the serial-parallel converter, and a reader/writer control port connected to the personal computer by the data bus and connected to the c

Abstract: An IC card data processing device, insertable into a standard memory expansion card slot of a computer, includes an outer main frame and an inner main frame to which the inner main frame is fixed. Within the inner main frame, first and second aligning mechanisms are provided respectively near an entrance and at a distal end of an IC card insertion path for aligning IC card inserted into the path. A slider, urged by springs toward the entrance end of the IC card insertion path, is moved toward the distal end by the inserted IC card. A link is connected between the slider and a card release button so that when the release button is pressed, the slider moves toward the entrance of the IC card insertion path to eject the card. A contact holder is fitted within an opening of the slider. The contact holder holds contacts for making an electrical connection with the IC card.

Abstract: A portable electronic device, also known as an IC card, according to the invention has a control element and a data memory. The memory area of the data memory is divided into a directory area and a user area. The user area is divided into a plurality of data-storing areas. Groups of area-defining data items are stored in the directory area, each data item defining one data-storing area of the user area. In addition, a group of data items defining the groups of area-defining data items is also stored in the directory area. The control element selects one of the groups as the group defining the data-storing area of the user area which can be used, in accordance with one of the data items of the group, which has been designated by the data supplied from an external device. The control element accesses those data-storing areas of the user area which are defined by the selected group.