Apple PowerBook (500 Series) - Manual (Page 36)

3 Make sure the modem is turned off.
4 Connect the modem cable to the port marked with this icon:
5 Turn on the modem.
6 Wake or restart the computer.
If your computer does not have an internal modem, the external modem is
ready to use.
If your computer does have an internal modem, continue with step 7.
7 Choose Control Panels from the Apple (
K
) menu and open the PowerBook Setup
control panel.
8 Click the Normal button to activate the external modem.
9 Close the control panel.
The external modem is ready to use.
29 Connecting Additional Equipment