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Reference Library: Hardware & Drivers
Serial devices communicate with a computer through a serial port, which transmits and receives data in a serial bit stream. In Mac OS X, developers can access serial-port devices through the I/O Kit in conjunction with the POSIX termios API. The I/O Kit also supports the development of serial controller drivers.

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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 2008-04-08
CCL Modem Scripting Release Notes (HTML)
Explains changes to modem CCLs for Mac OS X v10.5 and what to do to change existing and supersede older scripts.
Release Notes 2007-10-31
CCL Modem Scripting Guide (HTML) (PDF)
Guides 2007-06-28
ExpressCard Prevents System Sleep (HTML)
QA1517: Describes how some ExpressCard cards can prevent system sleep and how to fix the problem.
Technical Q&As 2007-02-28
Building Universal I/O Kit Drivers (HTML)
TN2163: How to build a universal I/O Kit kernel driver while avoiding common pitfalls.
Technical Notes 2006-11-10
USBPrivateDataSample (HTML) (DMG) (ZIP)
Demonstrates notifications when a USB device is hotplugged and associating arbitrary data with each device.
Sample Code 2006-10-16
HBA Device Driver Programming Guide (HTML) (PDF)
Describes how to develop a high-performance, kernel-resident driver for an HBA device.
Guides 2006-05-23
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
Device File Access Guide for Serial Devices (HTML) (PDF)
Guidelines for using I/O Kit and POSIX functions to develop applications that communicate with serial devices.
Guides 2005-12-06
SerialPortSample (HTML) (DMG) (ZIP)
Demonstrates how to do serial I/O on Mac OS X.
Sample Code 2005-08-16
Installing smart card reader drivers (HTML)
QA1359: Updates obsolete information contained in the pcscd(8) man page on Mac OS X Jaguar and Panther.
Technical Q&As 2004-08-30
Generating an NMI Without a Programmer's Switch (HTML) (日本語 HTML)
QA1264: Explains how to generate a non-maskable interrupt (NMI) on CPUs without programmer's switches.
Technical Q&As 2004-04-26
Issues with boot time KEXT loading (HTML) (日本語 HTML)
QA1087: Explains how to solve problems with loading KEXTs at boot time.
Technical Q&As 2004-01-15
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.
Technical Q&As 2003-10-28
Understanding and Debugging Kernel Panics (HTML) (日本語 HTML)
TN2063: Addresses kernel panics: what they are and how to debug the code that caused the panic.
Technical Notes 2002-11-11
Mapping kernel memory to user space on Mac OS X 10.2 (HTML) (日本語 HTML)
QA1197: Describes a change to mapping kernel memory to user space affecting Mac OS X 10.2 and later.
Technical Q&As 2002-09-13
IODeviceTree & the IORegistry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X IORegistry.
Technical Q&As 2002-02-13
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
Making sense of IOKit error codes (HTML) (日本語 HTML)
QA1075: Explains how to interpret I/O Kit error codes.
Technical Q&As 2002-02-07
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
Adding dependencies with kmodload (HTML)
QA1097: Illustrates how to specify dependencies when using kmodload.
Technical Q&As 2001-12-05
The dreaded "incompatible flag -framework" error (HTML)
QA1096: Explains how to eliminate the incompatible flag -framework error in Project Builder.
Technical Q&As 2001-12-05
Serial API Choice (HTML)
DV39: Discusses the choice of serial APIs supported by traditional Mac OS and Mac OS X.
Technical Q&As 2001-07-02
Is the Open Firmware device tree object oriented? (HTML)
HW80: Discusses the object-oriented attributes of the Open Firmware device tree.
Technical Q&As 1999-11-15
Sample code for allocating an amount of dictionary space (HTML)
HW71: Discusses the allocation and the setting of memory for Dictionary space in Open Firmware.
Technical Q&As 1999-10-11
What is the "dump" word and how do I use it? (HTML)
HW68: Describes the function of the Open Firmware word "dump" and how it can be used.
Technical Q&As 1999-10-11
What numeric base is the default for the Open Firmware user interface? (HTML)
HW65: Describes how the default numeric base used by the Open Firmware user interface is hexadecimal.
Technical Q&As 1999-10-11
Determining Open Firmware configuration variables (HTML) (日本語 HTML)
HW56: Discusses how to determine the Open Firmware variables on a system.
Technical Q&As 1999-03-29
Expansion ROM device properties (HTML) (日本語 HTML)
HW50: Describes the Open Firmware properties that should be included in a boot device's expansion ROM.
Technical Q&As 1999-03-29
Why did the name of the PCI bridge change? (HTML) (日本語 HTML)
HW59: Explains the name change of the PCI bridge to the generic name "pci" in Open Firmware.
Technical Q&As 1999-03-29
Are interrupts enabled while Open Firmware is running? (HTML) (日本語 HTML)
HW44: Explains that interrupts are disabled when Open Firmware is running.
Technical Q&As 1999-02-15
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
PCI Type 1 Cycles (HTML)
HW26: Describes the circumstances when the PowerMac generates a Configuration Type 1 command.
Technical Q&As 1995-07-15