System for discriminating that an external processor is permitte

Details System for discriminating that an external processor is permitte System for discriminating that an external processor is permitte

1995-12-29

1998-04-07

Lee, Thomas C.

395856, 395490, 395833, G06F 1520, G06F 1214

Patent

active

057375712

ABSTRACT:
A data processing system comprises an IC card and a personal computer connected to each other with a connector. The IC card includes a data storage section for storing data, and a control section for controlling the data storage section according to control signals received from the personal computer. When the IC card is connected to the personal computer, the IC card is operated after the personal computer sends an access signal to the IC card. In a modified example, the personal computer sends signals in a prescribed sequence, and the IC card is operated after the IC card detects that the signals are received in a prescribed sequence.

REFERENCES:
patent: 4777355 (1988-10-01), Takahira
patent: 5252812 (1993-10-01), Nakamura
patent: 5293424 (1994-03-01), Holtey et al.
patent: 5319765 (1994-06-01), Kimura
patent: 5442704 (1995-08-01), Holtey
patent: 5461675 (1995-10-01), Diehl et al.
patent: 5491827 (1996-02-01), Holtey
patent: 5509076 (1996-04-01), Sprunk
patent: 5513261 (1996-04-01), Maher

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