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Technical Q&As: Hardware
The Human Interface Device (HID) class is one of several device classes that the USB standard describes. Mac OS X developers can use the HID Manager to access HID-class devices, such as joysticks and non-Apple displays, and the Force Feedback framework to access devices that provide tactile sensation to the user. The Force Feedback framework defines a programming interface that is functionally similar to Microsoft's DirectInput API.

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Are interrupts enabled while Open Firmware is running? (HTML) ()
HW44: Explains that interrupts are disabled when Open Firmware is running.
1999-02-15
Determining Open Firmware configuration variables (HTML) ()
HW56: Discusses how to determine the Open Firmware variables on a system.
1999-03-29
Driver Gestalt & Icon Services (HTML) ()
DV37: Describes the interaction of Driver Gestalt & Icon Services
1999-10-05
Expansion ROM device properties (HTML) ()
HW50: Describes the Open Firmware properties that should be included in a boot device's expansion ROM.
1999-03-29
Generating an NMI Without a Programmer's Switch (HTML) ()
QA1264: Explains how to generate a non-maskable interrupt (NMI) on CPUs without programmer's switches.
2004-04-26
Getting started with Forth (HTML) ()
HW53: Describes where FCode driver developers can get information about the Forth programming language.
1999-03-29
HID Manager Event Data Underruns (HTML)
QA1038: Explains how to correctly handle HID Manager event queue data underruns.
2001-06-13
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.
2003-10-28
IODeviceTree & the IORegistry (HTML) ()
QA1120: Describes the IODeviceTree plane in the Mac OS X IORegistry.
2002-02-13
IOKit Framework Headers (HTML) ()
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
2002-01-15
Is the Open Firmware device tree object oriented? (HTML)
HW80: Discusses the object-oriented attributes of the Open Firmware device tree.
1999-11-15
Issues with boot time KEXT loading (HTML) ()
QA1087: Explains how to solve problems with loading KEXTs at boot time.
2004-01-15
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
2000-09-05
PCI Type 1 Cycles (HTML)
HW26: Describes the circumstances when the PowerMac generates a Configuration Type 1 command.
1995-07-15
Retain Counts of io_object_t Objects in IOKit.framework (HTML) ()
QA1195: Distinguishes between the retain counts of an I/O Kit kernel object and its io_object_t user space proxy.
2002-09-04
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.
1999-10-11
SDRAM Problems With Self-Powered USB Devices (HTML) ()
HW82: Alerts that non-compliant, self-powered USB devices plugged into a G4, can cause problems with low-voltage-sensitive SDRAM .
2003-08-21
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.
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.
1999-10-11
Why did the name of the PCI bridge change? (HTML) ()
HW59: Explains the name change of the PCI bridge to the generic name "pci" in Open Firmware.
1999-03-29