A computerized data-bearing card which includes an internal microcomputer chip which includes a random access memory, a read-only memory and a programmable read-only memory, and which is constructed so that digitized data may be read from and written into the microcomputer by an independent reader/writer...http://www.google.de/patents/US4829166?utm_source=gb-gplus-sharePatent US4829166 - Computerized data-bearing card and reader/writer therefor
