Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1989-06-19
1991-12-03
Levy, Stuart S.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235492, G06K 500
Patent
active
050702335
ABSTRACT:
An IC card reader/writer has frequency mode identifying means for determining whether or not an IC card loaded thereon has an identifiable frequency. When the frequency mode of the IC card is identifiable, clock frequency determining means reads frequency data representative of an operating clock frequency out of the IC card to determine an operating clock frequency particular to the card. Based on the determined operating clock frequency of the IC card, frequency setting means converts reference clock pulses being generated by reference clock generating means into clock pulses which match the clock frequency of the IC card, and feeds those clock pulses to the card. The reader/writer is capable of producing clock pulses the frequency of which is variable in matching relation to the frequency of operating clock pulses of an IC card.
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patent: 4650981 (1987-03-01), Foletta
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patent: 4798941 (1989-01-01), Watanabe
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patent: 4818855 (1989-04-01), Mongeon et al.
patent: 4845347 (1989-07-01), McCrindle et al.
patent: 4899036 (1990-02-01), McCrindle et al.
patent: 4928000 (1990-05-01), Eglise et al.
Hirata Hiroharu
Takizawa Toshio
Levy Stuart S.
OKI Electric Industry Co., Ltd.
Weinberg Richard
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