Static information storage and retrieval – Hardware for storage elements
Patent
1988-09-07
1990-04-10
Gossage, Glenn A.
Static information storage and retrieval
Hardware for storage elements
365226, 365228, 36518906, 235380, 235492, G11C 500, G11C 700, G06K 500, G06K 1906
Patent
active
049166620
ABSTRACT:
An IC card writing system for writing data in a memory in an IC card includes a data writing device for writing data in the memory in the IC card utilizing a voltage which is below a predetermined value after it has received a memory identification signal, by applying a voltage having at least the predetermined value to an input terminal of the IC card. A high voltage detecting/suppressing circuit detects the voltage applied to the input terminal of the IC card by the data writing device, and, when the voltage equals or exceeds the predetermined value, suppresses the voltage applied to the input terminal of the IC card to below the predetermined value while outputting a detection signal. A memory identification signal generating circuit containing memory identification data concerning the memory of the IC card outputs the memory identification signal to the data writing device when it receives the detection signal from the high voltage detecting/suppressing circuit.
REFERENCES:
patent: 4727244 (1988-02-01), Nakano et al.
patent: 4767920 (1988-08-01), Kitta et al.
patent: 4785166 (1988-11-01), Kushima
Gossage Glenn A.
Mitsubishi Denki & Kabushiki Kaisha
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