HP Visualize c360 PA-RISC Visualize Workstation Universal Serial Bus - Page 6

USB Standards Report There are two hardware Host Controller Interface architectures: UHCI (Universal), and OHCI (Open). UHCI appears on Intel motherboards. OHCI is predominant elsewhere - and is what PA-RISC workstations will use. The underlying USB Standard is presently at release 1.1. {http://www.usb/org} Driver Classes have been defined by Working Groups for ( - release level) Common - 1.0 Hub - 1.0 Physical I/F - 1.0 Audio - 1.0 Imaging - 1.0 Power - 1.0 HID (Human I/F Device) - 1.0 InfraRed - 0.9 Printing - 1.0 Communications - 1.09 Monitor Control - 1.0 Vendor-Specific - N/A MS Windows API Status: Windows provides legacy thunking code for well-behaved drivers. The status of open Win32 USB APIs is not clear. Unix API Status (USBDI) is at 0.8. {URL pending} As is traditionally the case in the Unix community, standards development is well behind implementations. USBDI APIs rely on UDI Meta Language. We'll all need to rewrite or thunk new libraries later (and implement UDI).