A portable electronic device includes a housing, a display area provided on one side of the housing, and a slot configured to receive an approximately credit card sized card. The card has a first semiconductor device provided at a first location on the card and a storage area provided on a second location...http://www.google.es/patents/US20030218064?utm_source=gb-gplus-sharePatente US20030218064 - Multi-purpose personal portable electronic system
