System having two PC cards in a hinged carrying case with battery compartment within in the hinge section

A companion computer system on two or more PC cards wherein each of said two or more printed circuit cards (PC cards) includes an interface for electrically and mechanically connecting digital components, said comprising:

• a first PC card conforming to said interface for electrically and mechanically connecting digital components;
• a first bus located on said first PC card and electrically communicating with said interface;
• a CPU located on said first PC card and connected to said first bus;
• a display located on said first PC card and connected to said first bus;
• an input device located on said first PC card and connected to said first bus;
• a non-volatile memory module located on said first PC card and connected to said first bus;
• a low power random access memory module located on said first PC card and connected to said first bus;
• a power supply located on said first PC card and connected to the components of said PC card and supplying electrical energy thereto;
• an operating system located in said non-volatile memory;
• a second PC card conforming to said interface for electrically and mechanically connecting digital components;
• a second bus located on said second PC card and electrically compatible with said first bus electrically communicating with said interface;
• additional functional means on said second PC card and connected to said second bus;
• a carrying case comprising:
• a first bay for receiving said first PC card;
• a second bay for receiving a second PC card:
• hinge means for rotatably connecting said first and second bays, said hinge means forming a battery compartment for holding a battery that supplies power to at least one of said PC cards;
• connector means located in said first and second bays for electrically connecting said first and second busses.