Apple PowerBook Duo Dock (including Duo Dock Plus) - Manual (Page 7)

The PowerBook Duo Dock and Duo Dock Plus are the most versatile
expansion options for the PowerBook Duo. A Duo Dock itself is not a
computer—you need a PowerBook Duo to use it. But the dock and the
PowerBook together provide the video, storage, and input/output capabilities
available on most desktop Macintosh computers.
This guide explains how to set up a Duo Dock or Duo Dock Plus and connect
other components to it to create a PowerBook Duo System. Although the
illustrations in this guide show the Duo Dock Plus, all explanations and
instructions are correct for the Duo Dock, Duo Dock Plus, and Duo Docks
that have been upgraded to a Duo Dock Plus (except where specifically
noted). In this guide the term Duo Dock is used to refer to the three
configurations of Duo Dock, Duo Dock Plus, and an upgraded Duo Dock. For
information about using the Macintosh system software or the PowerBook
Duo, consult the documentation that came with your PowerBook.
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Using the PowerBook Duo Dock