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Leopard Technical Q&As: Hardware & Drivers
Mass storage devices run the gamut from the fastest read/write peripheral disk drives to sequential-access tape drives. Mac OS X provides a layered mass storage driver stack that has built-in support for common industry-standard devices. Developers can use the BSD interface and I/O Kit APIs to access storage devices and their media at different layers of the stack.

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Allocating and sharing memory with user space from an I/O Kit driver (HTML) (日本語 HTML)
QA1197: Describes the preferred technique for allocating and sharing buffers in an I/O Kit kernel driver.
Generating a Non-Maskable Interrupt (NMI) (HTML) (日本語 HTML)
QA1264: Explains how to generate a non-maskable interrupt (NMI) on modern Macintosh systems.
Retain Counts of io_object_t Objects in IOKit.framework (HTML) (日本語 HTML)
QA1195: Distinguishes between the retain counts of an I/O Kit kernel object and its io_object_t user space proxy.
IODeviceTree and the I/O Registry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X I/O Registry.
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
Sending SCSI or ATA commands to storage devices (HTML) (日本語 HTML)
QA1179: Explains that Mac OS X does not implement SCSI or ATA pass-through for many mass storage devices.
Installing an I/O Kit KEXT Without Rebooting (HTML)
QA1319: Describes the state of the art of installing I/O Kit kernel extensions (KEXTs) without requiring a restart.
SDRAM Problems With Self-Powered USB Devices (HTML) (日本語 HTML)
HW82: Alerts that non-compliant, self-powered USB devices plugged into a G4, can cause problems with low-voltage-sensitive SDRAM .
Power Management; Policy Maker vs. Power Controller (HTML) (日本語 HTML)
QA1121: Describes the differences between a Power Management Policy Maker and a Power Management Power Controller.
IOKit Framework Headers (HTML) (日本語 HTML)
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
The dreaded "incompatible flag -framework" error (HTML)
QA1096: Explains how to eliminate the incompatible flag -framework error in Project Builder.
Legacy Devices (HTML)
HW84: Discusses why legacy devices with hard-wired I/O addresses may not work properly with Open Firmware.
A SCSI little secret (HTML)
HW81: Details what to expect when accessing the motherboard SCSI bus on the Blue & White G3.
Which Machines Support Driver Services Library and the MP Nanokernel? (HTML) (日本語 HTML)
HW63: Lists the systems that do and don't support the Driver Services Library and the MP Nanokernel.
Booting after invoking the Open Firmware user interface (HTML) (日本語 HTML)
HW48: Tells how to boot a system after entering the Open Firmware user interface.
What are configuration variables in Open Firmware? (HTML) (日本語 HTML)
HW38: Defines the configuration variables in Open Firmware.
What are snag keys in Open Firmware? (HTML) (日本語 HTML)
HW35: Explains Open Firmware snag keys, including examples of their function.
Detecting a CD-ROM (HTML) (日本語 HTML)
DV18: Demonstrates CD-ROM drive detection.
Getting a List of Drivers & LUNs (logical unit numbers) (HTML)
Deprecated - DV04: Describes a legacy Mac OS technique for obtaining a list of SCSI Parallel drivers, devices, and LUNs.