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 Mac computers. This software cannot be installed on Mac 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.
MacOS 8.6 or later, A Power Mac computer with PCI slots and a USB PCI adapter card.