HP Vectra VL 5/xxx Series 5 - Manual (Page 36)

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2 System Board
Devices on the PCI Bus
Universal Serial Bus (USB) Controller
When the HP Vectra VL 5/xxx Series 5 and XA 5/xxx PCs were first
released, they were preloaded with the Microsoft Windows 95 operating
system, version SR2. The Microsoft Supplement 2.1 software, which
provides support of the Universal Serial Bus, was not available. When it
becomes available, it can be obtained from the Hewlett-Packard World Wide
Web site:
http://www.hp.com/go/vectrasupport/
You can verify that your PC has Windows 95 support for the USB installed by
clicking on the “Add Software” folder in the Windows 95 Control Panel, and
see if OSR 2.1 WDM/supplement is installed. If it is not listed, you should
install the Microsoft Supplement 2.1 software.
USB works only if the USB interface has been enabled within the HP Setup
program. Currently, only the Microsoft Windows 95 operating system
provides support for the USB.