Portable electric device

Details Portable electric device Portable electric device

1991-06-06

1994-11-15

Pitts, Harold

Registers

Systems controlled by data bearing records

Credit or identification card systems

235437, 235492, G06K 500

Patent

active

053650450

ABSTRACT:
An IC card comprises, a memory including a system area for storing system information, and a user area for storing user information, a CPU for controlling information read/write access of the memory, and a memory for storing program data for determining an operation of the CPU. The CPU stores predetermined data in the user area on the basis of a first command obtained from an external device, and compares the predetermined data with another predetermined data stored in the user area on the basis of a second command obtained from the external device. The CPU detects an abnormality of one of the memory, and data and address lines of the memory according to the result of comparison.

REFERENCES:
patent: 4845717 (1989-07-01), Iijima

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