22. A user card transaction system, comprising:
a user card containing a microprocessor and associated memory, and a plurality of contacts for transferring data to and from said microprocessor and memory, including a first data input/output contact and a second data input/output contact;
a first peripheral device which does not include microprocessor for processing data that is transferred to and from said user card via said contacts and whose operations are controlled by said microprocessor of said user card, said peripheral device including a data input/output terminal that is connectable to said first input/output contact of said user card; and
a second peripheral device which does not include microprocessor for processing data that is transferred to and from said user card via said contacts, said peripheral device including a data input/output terminal that is connectable to said second input/output contact of said user card.
United States Patent 6,199,128 Inventors: Sarat; Jean-Marc (Belmont, CA)