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Leopard Reference Library: Hardware & Drivers
Based on the Common UNIX Printing System (CUPS), the Mac OS X printing system supports a wide variety of PostScript and raster printers and offers many advanced features. It also allows printer drivers and applications to present modular and extensible user interfaces, so that developers can take advantage of and extend Apple's interface.

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Are the Name Registry device tree nodes unique? (HTML)
Deprecated - HW64: Discusses whether Name Registry nodes copied from the Open Firmware device tree are unique.
Technical Q&As 1999-10-11
Checking for the Printer Driver (HTML)
Deprecated - DV42: Describes a legacy Mac OS technique avoiding system hangs when using serial drivers on USB systems.
Technical Q&As 2000-06-19
Detecting low printer ink levels (HTML)
TN2144: How to detect printer supply levels using a low ink tool
Technical Notes 2005-06-29
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
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
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
New PPD keywords available in Mac OS X version 10.3 (HTML)
QA1352: Describes the new PPD keywords available for CUPS filters in Mac OS X 10.3.
Technical Q&As 2004-05-26
Obtaining 16 Bits-Per-Color Data with CUPS Raster Printing (HTML)
TN2149: Obtaining 16 Bits-Per-Color Data with CUPS Raster Printing
Technical Notes 2005-08-24
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
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
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
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
Why does logging keep my Printer Module from working? (HTML) (日本語 HTML)
Deprecated - QA1182: Describes some problems with standard printf logging in a Printer Module on Jaguar.
Technical Q&As 2002-11-06
Why don't all of my PDE localizations show up in all applications? (HTML) (日本語 HTML)
QA1185: Explains why some PDE localizations might not appear in all applications.
Technical Q&As 2002-10-16