| 摘要 |
<p>An IC information card includes a programmed microprocessor and a nonvolatile read/write memory (EPROM) embedded in a plastic card. Terminal contacts on the face of the card enable interfacing with a reader/writer coupled to a host computer, such as an IBM-XT. The data storage portion of the memory in the card is segmentable into one or more data zones, each requiring either no access code or one or more access codes to be entered in the card in order to access (read and/or write) that zone. Segmentation of the card memory and the assignment of required access codes is achieved by writing a zone definition table and one or more access codes into the card memory using a special access code that is fixed in the microprocessor program. The access codes for the data zones are thus stored on the card and the programmed microprocessor in the card compares incoming codes to the stored codes to determine whether access to a particular data zone is permissible. The access codes for the data zones of the card memory are advantageously stored in a control card, which is interfaced to a two-card reader/writer together with the card to be accessed. In this manner, the required access codes are transferred from the control card to the information card when access of a data zone therein is required, and the access codes stored in the control card need not become known to any individual. The card is locked upon failure to receive a proper access code a predetermined number of times in succession, but can be unlocked up to a certain number of times by providing an unlocking code in combination with prespecified access codes. An initializer system initializes the cards by writing a zone definition table and one or more access codes in the card memory and by reading a file identification code prewritten on a magnetic stripe of the card. The file identification code is used to locate a corresponding data file in a mass storage device associated with the computer. The data in the corresponding data file are then written into appropriate data zones of the memory of the card.</p> |
