Apple PowerBook (Duo, 2300 Series) - Manual (Page 51)

10 Choose General Settings from the pop-up menu.
11 If there is an X in the box labeled “Use internal modem instead of Modem Port,” click the
box to remove the X.
Removing the X from the box assures that the printer/external modem port
will receive the computer’s signals.
12 Close the control panel.
The external modem is ready to use.
If you don’t have the Express Modem control panel: If you have another kind of
internal modem, you can activate an external modem by opening the
PowerBook Setup control panel and clicking the Normal button. (The
internal modem may also have its own control panel. See the manual that
came with the modem for complete instructions.)
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