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Portable data carrier including a microprocessor

  • US 4,211,919 A
  • Filed: 08/25/1978
  • Issued: 07/08/1980
  • Est. Priority Date: 08/26/1977
  • Status: Expired due to Term
First Claim
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1. A portable data carrier for storing and processing data, comprising:

  • a microprocessor,a memory operatively associated with said microprocessor having a first zone to which access by devices external to said carrier is prevented, and in which reading and writing by circuits internal to said carrier are permitted;

    said microprocessor including internal first means for reading and writing in said memory;

    second means for receiving external data to be written in said memory, and third means for externally transmitting data read from said memory,said first means internal to said portable data including means for checking an enabling key received from a device external to said carrier,and said portable data carrier further comprising means associated with said reading element for storing error information in a zone of said memory in the event the received key is incorrect; and

    means associated with said reading element for storing access information in another zone of said memory in the event the received key is correct.

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