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Leopard Reference Library: Hardware & Drivers
Typically, scanners transmit digital data over SCSI, USB, or FireWire connections. Developers can use the Mac OS X Image Capture architecture to develop applications that access scanners.

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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.
Reference 2009-03-04
SCSIOldAndNew (HTML) (DMG) (ZIP)
Demonstrates a backward-compatible technique for communicating with SCSI parallel devices on Mac OS X.
Sample Code 2006-12-07
USBPrivateDataSample (HTML) (DMG) (ZIP)
Demonstrates notifications when a USB device is hotplugged and associating arbitrary data with each device.
Sample Code 2006-10-16
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.
Technical Q&As 2008-10-13
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.
Technical Q&As 2008-10-13
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.
Technical Q&As 2008-09-24
IODeviceTree and the I/O Registry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X I/O Registry.
Technical Q&As 2008-09-18
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
Technical Q&As 2006-02-22
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.
Technical Q&As 2005-05-10
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.
Technical Q&As 2002-02-13
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.
Technical Q&As 2002-01-15
What are configuration variables in Open Firmware? (HTML) (日本語 HTML)
HW38: Defines the configuration variables in Open Firmware.
Technical Q&As 1999-02-15