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Leopard Sample Code: 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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USBPrivateDataSample (HTML) (DMG) (ZIP)
Demonstrates notifications when a USB device is hotplugged and associating arbitrary data with each device.
 2006-10-16
SerialPortSample (HTML) (DMG) (ZIP)
Demonstrates how to do serial I/O on Mac OS X.
 2005-08-16