Data card circuits

Details Data card circuits Data card circuits

1988-03-30

1989-06-20

Pitts, Harold I.

Registers

Records

Conductive

235380, G06K 1906

Patent

active

048411337

ABSTRACT:
An integrated circuit for a data or "smart" card includes a non-volatile memory (8) having a transport code preprogrammed therein, control circuitry (10), a comparator (24) for comprising an externally-applied code and the transport code, and a fuse (26) which is blown if the two codes match thereby allowing the card to be initialised with a personal identification number and initial credit values. A second fuse (28) may also be provided which is blown if the two codes do not match and sensing means (32, 34) sense the status of the two fuses (26, 28) and block any further attempts to initialise the card if the second fuse (28) is blown and the first fuse (26) is not.

REFERENCES:
patent: 3641499 (1972-02-01), Housman

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