IC card system

Details IC card system IC card system

1988-06-14

1989-03-28

Pitts, Harold

Registers

Systems controlled by data bearing records

Credit or identification card systems

235492, G06K 500

Patent

active

048166561

ABSTRACT:
An IC card system uses at least one of the RESET, I/O, and CLOCK terminals of an IC card so as to serially and/or parallel input multivalue signals having different levels. The levels of the input signals are detected at a detector or detectors and outputs therefrom are compared at a comparator with specific codes prestored in level matrix of the IC card. If a coincidence between outputs obtained corresponding to the input signals and the specific codes is established, a test program stored in a test program ROM is started.

REFERENCES:
patent: 4105156 (1978-08-01), Dethloff
patent: 4582985 (1986-04-01), Lofberg

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