Bus Type: 32 Bit PCI Speed: Up to 480 Mbit/sec (high) I/O Address: " Plug & Play" IRQ Selection: " Plug & Play" Connectors: 4 x Type A USB (Universal Serial Bus) Female (external) + 1 x Type A USB (Universal Serial Bus) Female (internal shared) Connect up to 127 devices EHCI based 480 Mbit/sec USB (Universal Serial Bus) 2.0 Hi-Speed compliant OHCI based 12 Mbit/sec USB (Universal Serial Bus) 1.1 compliant Connects USB (Universal Serial Bus) 2.0 or USB (Universal Serial Bus) 1.1 devices to your computer Requires available PCI slot Software Compatibility: Windows 98/ME/2000/XP/ Vista & Mac OS 10