The invention relates to novel phosphorus-containing dendrimers having a core, at least one generation and an external layer consisting, completely or partly, of identical or different units, the said units satisfying the following formula :in which R1 and R2, which may be identical or different, are alkyl, alkoxy or aryl groups. The normal electrical power system has a direct current output circuit to provide initial power for starting the computer and the direct current output circuit has a share circuit including a switch line which can be selected to a state of supplying power and a normal circuit for power output for maintaining the computer to start at a normal condition. The controller may display second information associated with a second information item on the touch screen on which the first information is already displayed as the second information item is selected from the item list in a state that the first information item is selected. The higher weights for the submacro nets define soft-bounds for the logic which still allow relocation of submacro components.