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Leopard Reference: Hardware & Drivers
Open Firmware is the nonproprietary name of firmware that complies with IEEE Std 1275-1994. It is the ROM-based software that tests and initializes the hardware, determines the hardware configuration, loads or boots the operating system, and provides interactive debugging facilities in case of faulty hardware or software.
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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
Kernel Framework Reference (HTML)
Describes the APIs and classes (including I/O Kit families) that support kernel-resident device drivers.
 2009-01-06