IC card

Details IC card IC card

1990-10-12

1991-08-13

Levy, Stuart S.

Registers

Records

Conductive

235380, 235382, 2353825, G06K 502, G06K 903

Patent

active

050398504

ABSTRACT:
An IC card with a product test program contained therein is provided with a read-only memory. This read-only memory stores various routines, and is arranged such that if a secret code assigned exclusively to that IC card has been already written in a non-volatile memory in the IC card, an externally entered secret code is collated with the stored secret code, and, if the collation is successful, the non-volatile memory is initialized. The test program can be executed only after the initialization has been completed.

REFERENCES:
patent: 4734568 (1988-03-01), Watanabe
patent: 4746788 (1988-05-01), Kawana
patent: 4777355 (1988-10-01), Takahira
patent: 4837422 (1989-06-01), Dethloff et al.
patent: 4845351 (1989-07-01), Hara et al.
Nikkei Electronics, No. 404, Sep. 22, 1986, pp. 133-144 and partial translation of p. 139.

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