| http://www.w3.org/ns/prov#value | - are inserted or removed, the input/output terminals of the transfer gates are maintained at high impedance, and it is possible to minimize the effects on the system bus at the time of insertion or removal. [0021] Further, in the present invention, a reserve charge power supply other than the main power supply for supplying power to a plurality of expansion devices is prepared, and the power supply
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