Apple IIe Card - Manual (Page 34)

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If you have a UniDisk 3.5 Drive and one Apple 5.25 Drive, first
connect the UniDisk 3.5 Drive to the Y-shaped cable. Then connect
the Apple 5.25 Drive to the UniDisk 3.5 Drive by plugging the
connector from the Apple 5.25 Drive into the port on the back of
the UniDisk 3.5 Drive.
UniDisk
3.5 Drive Apple
5.25 Drive
Chapter 1: Preparing the Equipment 18