The PowerBook G4 computer comes with a built-in modem. The connector for the modem is an RJ-11 connector on the back of the computer.
The modem is connected to an internal USB port and is a vendor-specific USB device. The modem driver controls the modem hardware and presents a virtual serial port to the operating system and applications. Applications that bypass the operating system's modem driver and communicate directly with the SCC will not work properly.
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