Memory cards

Details Memory cards Memory cards

1989-07-17

1990-03-20

Walberg, Teresa J.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235379, 235488, G06K 1900

Patent

active

049103938

ABSTRACT:
A debit card of the type having an integrated circuit on a semiconductor chip embedded in a plastic card includes logic circuitry (10), a counter (2), a ROM (6) and an EEPROM (8) for storing the value of the counter between transactions. By providing two EEPROMs (8A, 8B) in parallel whose values are compared by a comparator (24), the security of the card is increased since operation of the card may be blocked if the two values are not the same, indicating that attempts have been made to fraudulently reprogram the card.

REFERENCES:
patent: 4471216 (1984-09-01), Herve
patent: 4697073 (1987-09-01), Hara

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