Leopard Reference Library
Hardware & Drivers Fundamentals contains essential information for developers of device drivers and other device-access software.

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I/O Kit Fundamentals (HTML) (PDF)
The basics of developing device drivers. Includes descriptions of I/O Kit families.
2007-05-17
I/O Kit Device Driver Design Guidelines (HTML) (PDF)
Design guidelines and tips for developing, debugging, and deploying kernel-resident device drivers, including user clients.
2007-03-06
Accessing Hardware From Applications (HTML) (PDF)
Tips and guidelines for developing applications that communicate with or control devices.
2007-02-08
Hardware Developer Note Terms and Abbreviations (HTML)
Lists common terms and abbreviations used in Apple's Hardware Developer Notes.
2006-08-08