Patent ID: 6917989
Filing Date: 2005-07-12
Classification: G06F

Abstract:
1. An expansion device used for transmission of data between a computer and a readout device, comprising: a main body connect to said computer; a mounting portion provided on said main body in which said readout device is mountable, said readout device being able to read information processing data from a storage medium storing the information processing data and to read sound producing data from a storage unit storing at least the sound reproducing data; audio circuits for processing the sound reproducing data; a first power input portion being supplied with source power for said expansion device from a power supply for said computer; a second power input portion being supplied with source power for said expansion device from a second power supply other than said power supply for said computer; and a DC/DC converter connected to the mounting portion and to the audio circuits, wherein operations of said audio circuits and said readout device awe enabled by supplying source power to the DC/DC converter from said second power input portion when said second power input portion has a higher voltage level than said first power input portion and supplying source power to the DC/DC converter from the first power input portion when said first power input portion has a higher voltage level than said second power input portion.