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Leopard Reference: Hardware & Drivers
Serial devices communicate with a computer through a serial port, which transmits and receives data in a serial bit stream. In Mac OS X, developers can access serial-port devices through the I/O Kit in conjunction with the POSIX termios API. The I/O Kit also supports the development of serial controller drivers.

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I/O Kit Framework Reference (HTML)
Describes the I/O Kit classes that support non-kernel access to I/O Kit objects through the device-interface mechanism.
2009-03-04