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Leopard Guides: Hardware & Drivers
USB is a cross-platform peripheral standard that offers many benefits, such as expandability, autoconfiguration, hot plugging, and good performance. Typical USB devices include keyboards, mice, joysticks, game pads, and other low-cost devices. Developers can use I/O Kit APIs to create both in-kernel and application-level drivers for USB devices and interfaces.
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Universal Serial Bus Developer Note (HTML)
Provides an overview of Universal Serial Bus (USB) and describes support for it on Mac computers.
 2008-04-28
USB Device Interface Guide (HTML) (PDF)
Provides background information and sample code for developing applications to communicate with or control USB devices and interfaces.
 2007-09-04
CCL Modem Scripting Guide (HTML) (PDF)
2007-06-28
User-Mode USB Device Arbitration (HTML)
Information about using USB device arbitration, available in Mac OS X version 10.1 and later.
 2002-02-06