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Expansion device connected to information device to thereby expand the functions thereof

  • US 6,917,989 B1
  • Filed: 07/26/2000
  • Issued: 07/12/2005
  • Est. Priority Date: 10/29/1999
  • Status: Expired due to Fees
First Claim
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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.

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