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2 System Board
Devices on the PCI Bus
It is possible to mix a fast and a slow device, such as a hard disk drive and a
a CD-ROM, on the same channel without affecting the performance of the
fast device. The BIOS determines automatically, the fastest configuration
that each device supports. However, in general, the IDE cable is
recommended for CD-ROM drives, and the SCSI cables for hard disk drives.
Universal Serial Bus (USB) Controller
The USB controller is implemented as part of the PIIX4 chip. It is accessed
through the PCI bus, and provides support for the two stacked USB
connectors on the back panel. Over-current detection and protection is
provided, but shared between the two ports.
USB works only if the USB interface has been enabled within the HP Setup
program. Currently, only the Microsoft Windows 95 and Windows NT
operating systems provides support for the USB.
The Microsoft Supplement 2.1 software called (called
USBSupp.exe), which
provides support of the Universal Serial Bus, can be obtained from the
Hewlett-Packard World Wide Web site (refer to “Access HP World Wide
Web” on page 21).
Other PCI Accessory Devices
PCI accessory boards are for high-speed peripheral accessories. A network
board could already occupy one of the PCI slots. A diagram showing the PCI
slots that are available for the desktop and minitower models is on page 27
.
Plug and Play The HP Kayak XA/ PC Workstations have a “PnP level 1.0A” BIOS and
meets the “Windows 95 Required” level for Plug and Play. Accessory boards
which are Plug and Play are automatically configured by the BIOS.