OrangeUSB for the Macintosh
Last updated: April 5, 2002
OrangeUSB PCI board is compatible with the Macintosh
All-in-one G3, Power Macintosh Beige G3 rev. B or later,
Power Macintosh Blue & White G3, and Power Macintosh G4
series computers. There is an incompatibility between
the OrangeUSB 2.0 PCI board and all other PCI based
the Apple System Profiler, located in the Apple menu, to
help determine which logic board revision you have. Open
Apple System Profiler, click the System Profile tab within
the window, and then look at the Production Information
section. Compare it to the table below to determine which
revision of the logic board is in your Power Macintosh G3
Macintosh 54xx, 55xx, 64xx, 65xx, 72xx, 73xx, 7500, 85xx,
86xx, 95xx, 96xx, Twentieth Anniversary Macintosh, Power
Macintosh G3 Beige rev A and all Macintosh clones.
is a limitation of Mac OS 8.6 – 9.1. Apple has fixed
this limitation in Mac OS 9.2, so to correct the issue
(82 MB) and upgrade to Mac OS 9.2.1.
2.0 is an evolution of the USB standard. USB 2.0 handles up
to 480 Mbps that creates opportunities for a new class of
high performance outside-the-box peripherals. USB 2.0
provides a straightforward performance enhancement to USB
1.1 and offers forward and backward compatibility with USB
1.1 devices. USB 2.0 preserves USB 1.1 in the plug and play
model, driver auto installation, and power management
features. With use of the same cables and connectors, USB
2.0 is fully backward compatible with USB 1.1. For developer’s,
no changes are required for applications and device drivers.
USB 2.0 offers a compelling opportunity to migrate their USB
peripherals to higher performance into the huge installed
base of USB-capable PCs.
2.0 offers 480Mbps of bandwidth, which are 40 times more
bandwidth over USB 1.1 of 12Mbps for Full Speed devices or
1.5Mbps for Low Speed devices. High performance devices such
as mass storage, broadband network connection, color printer
and scanner can now be practically implemented in USB 2.0
for required bandwidth. Especially for printer and scanner
type of application can take advantage of delivering data
right on the time of demand which reduces the need of memory
buffer inside the specific applications. Unlike in USB 1.1
and other buses, low and full speed devices will run at high
speed rate of USB 2.0. This allows other devices on the bus
to share the bus.
2.0 Ready means the OrangeUSB host controller will operate
as a fully compliant USB 1.1 host controller for any USB 1.1
or USB 2.0 device under Mac OS 8.6 and Mac OS 9.x after
installing Apple USB Adapter Card Support. Under Mac OS X,
install OrangeUSB 2.0 Hi-Speed drivers and users can connect
USB 1.1 and USB 2.0 Hi-Speed peripherals to a USB 2.0
Hi-Speed port. The current USB 1.1 peripherals will continue
to have a data transfer rate of 12 Mbits/s, while USB 2.0
Hi-Speed peripherals will have a data transfer rate of 480
Micro was the first to ship a USB 2.0 Host controller, Early
2001. At the time, the only USB 2.0 devices on the market
were external USB 2.0 hard drives. Now CD-RW drives are
plentiful. Every month new types of USB 2.0 devices are
being announced. With each new class of device, changes may
be required to the OrangeUSB 2.0 driver software. To insure
that you have the newest USB 2.0 functionality as it becomes
available, we provide the OrangeUSB 2.0 drivers on our
Check back periodically for updates to these drivers.
USB 2.0 is forward and backward compatible with USB 1.1. All
USB 1.1 devices can be used simultaneously with USB 2.0
devices without affecting performance of either.
USB 2.0 is backward compatible with USB 1.1. You can use the
USB 1.1 host controller with USB 2.0 devices. But you will
not enjoy the 480Mbps benefit of the USB 2.0.
USB 2.0 is backward compatible with USB 1.1 even down to
cable and connectors. All cables and connectors in USB 2.0
and USB 1.1 are created equal. You can use the existing
certified USB 1.1 cables to enjoy the full benefit of USB
2.0. However, we recommend USB 2.0 certified cables.
USB 1.1 devices will not run at 480Mbps in USB 2.0
environment. But USB 1.1 devices will maintain better
performance running through the OrangeUSB. This is due to
brilliant architecture of multiple host controllers inside
the OrangeUSB host controller chip. Users will be more
productive with multiple USB 1.1 devices running together
through the OrangeUSB board.
OrangeUSB 2.0 Hi-Speed PCI board uses an NEC chipset that
has 3 USB host controller engines on board. Two of the host
controller engines handle USB 1.1 transactions. One of the
host controller engines handle, USB 2.0 transactions.
© Orange Micro, Inc. 2002. All rights reserved.