North American English
USB Adapter Card Support is a set of
software extensions that provide support for
USB adapter cards installed in the PCI bus or
CardBus slots in Macintosh computers.
Universal Serial Bus (USB) is a new
standard for connecting peripheral devices to
Macintosh computers. Common USB devices
include ink jet and laser printers, digital
still cameras, scanners, game pads, joysticks,
keyboards, mouse devices, storage devices, and
hubs. USB provides many advantages, including
the ability to "hot plug" and unplug
devices without shuttting down or restarting
the computer, support for up to 127 attached
devices, and up to 12 megabits per second
USB Adapter Card Support requires a
PowerPCTM-based Macintosh computer with PCI or
CardBus slots, Mac OS 8.6 or later, and a USB
This software cannot be installed on
Macintosh computers with built-in USB ports.
These computers already include support for
built-in USB ports and USB PCI adapter cards.
Important: This software supports
only USB cards that comply with the Open Host
Controller Interface (OHCI) specification and
may not work with every USB adapter card.
Contact the manufacturer of your USB adapter
card if necessary to verify that your card is
OHCI-compliant and supported by this software.
Installing USB Adapter Card Support
If you haven't already done so, install the
USB adapter card following the instructions
provided by the manufacturer. Then download
the USB Adapter Card Support software from the
Apple Software Updates web site: http://www.apple.com/swupdates.
To install the USB Adapter Card Support
software, follow these steps:
1. Double-click the Apple SW Install icon.
2. Choose Recommended Installation.
3. Click Start to install the USB Adapter
Card Support software on your startup disk.
4. When the installation is complete,
restart your computer.
After your computer restarts, the USB Adapter
Card Support software is ready for use.
What Is Installed
- USB Adapter Card Support installs the
following extensions in your System
- USB Support
- USB Device Extension
- USB Software Locator (requires Mac OS 9)
- HID Library
- Serial ShimLib
- USB Mass Storage Support
- USB Mass Storage Extension
Using USB Adapter Card Support
After you install the USB card and the USB
Adapter Card Support software, you can begin
using USB devices. Follow the instructions for
using the device provided by the manufacturer.
Some devices require additional software.
If the message "The software needed to
use the USB device 'name of the device' can
not be found" appears when you plug in a
USB device, the device you are using requires
additional software. Contact the device
manufacturer to obtain the software required
to operate the device.
Warning: Do not disconnect a mass
storage device from the USB port while copying
files to or from the device, while files or
applications stored on the device are in use,
or while the device has volumes mounted on the
desktop. Doing so may result in the loss of
Devices That Work With USB Adapter Card
The following types of devices work with
USB Adapter Card Support.
- Mouse devices
- Supports native USB printers and
- For PostscriptTM printers, use the
Desktop Print Utility to configure for use
- For non-Postscript printers, use the
Chooser extension supplied by the
- Supports communications-class modems.
- Apple supplies support via the Modem
Control Panel (Communication Toolbox). You
may need to select your particular modem
script in the Modem Control Panel. Generic
modem scripts are also available.
- Joysticks and other gaming controllers
- Supports games that use Apple's
- Mass storage
- Only devices that are compliant with the
USB Mass Storage Class specifications will
work with this software. Some compliant
devices may have unique features beyond
what is defined in the USB Mass Storage
Class specifications and require
additional software provided by the
Tips and Troubleshooting
Some Macintosh G3 models may not wake from
sleep correctly with this software installed.
Use the Energy Saver control panel to set the
system sleep to "never", or
uninstall the USB Adapter Card Support
software to avoid this issue.
PowerBook G3 computers with CardBus cards
will hang with USB Adapter Card Support
installed if processor cycling is allowed. Use
the Energy Saver control panel to turn off
processor cycling. You need to set this for
both battery and power adapter operation.
The Power key on the Apple USB keyboard
will start up the computer only when it is
attached directly to a Macintosh computer's
built-in USB port. It will not start up the
computer when attached to a USB PCI or CardBus
Although the USB Adapter Card Support
software supports USB keyboards and mouse
devices, it is recommended that you use an ADB
keyboard and mouse as your primary input
devices. You may experience limited
functionality using some USB input devices in
certain applications, including Easy Access
and the Keyboard control panel.
If a USB device does not function after you
install a USB PCI adapter card and this
software, open Apple System Profiler and click
the Devices and Volumes tab to view the names
of attached USB devices. Verify that the
device has been detected. If the device name
does not appear, it has not been detected.
Confirm that the device has been attached
correctly to the USB adapter card and that the
USB adapter card is firmly seated in the PCI
slot. If the device still does not appear in
the Apple System Profiler, contact the device
manufacturer to determine if additional
software is required to operate the device.
To mount or remount a USB mass storage
volume on the desktop, unplug and replug the
device that contains the volume into a USB
port on the computer, or into a hub attached
to the computer. The volume should appear on
the desktop in a few seconds. If the device
uses removable media, the volume will not
appear until the removable media is reinserted
into the mass storage device.
To eject removable storage media in drives
with manual eject mechanisms, drag the icon of
the media volume to the Trash. Eject the media
only after a message says it is safe to do so.
Important: Do not remove the media
from the device until the message indicates
that it is safe.
The clock on a USB adapter card may
sometimes fall out of synchronization with the
computer's clock. USB-based audio will then
lose synchronization, resulting in either an
inaccurate sample rate, or gaps in the audio
data stream. If more precision is required
when capturing or playing USB-based audio, a
Macintosh with built-in USB ports is highly
For additional information, go to http://www.apple.com/support
Note: Alternate keyboard layouts,
such as Dvorak and AZERTY, do not work with a
USB keyboard that is connected to a USB
adapter card. For more information, please see
article 25210: "USB
Adapter Cards: Limited Functionality With Some