52
Chapter 2
System Board
Devices on the PCI Bus
SCSI-configured-automatically (SCAM) support is provided at level 2, for Plug and Play.
However, hot swap is not supported. The controller is BBS compliant.
The Ultra-wide SCSI controller and cable supports RAIDport PCI devices such as the HP
FastRAID solution (refer to the section “HP FastRAID2” in this chapter).
Integrated Drive Electronics (IDE)
The IDE controller is implemented as part of the PIIX4E chip. It is driven from the PCI
bus, and has PCI-Master capability. It supports Enhanced IDE (EIDE) and Standard IDE
channels. It also supports data rate up to 33 MBytes/second (Ultra DMA 33 mode). To use
the Enhanced IDE features the drives must be compliant with Enhanced IDE.
The IDE controller supports two devices (one master and one slave) connected to a single
channel. The channel is fitted with an IDE cable with two connectors.
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
automatically determines 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 PIIX4E chip. It is accessed through the
PCI bus, and provides support for the two stacked USB connectors on the back panel
individually. Over-current detection and protection is also provided.
Because the AGP connector defines a USB connection, it is possible to redirect one of the
two USB ports to the AGP connector. In this case, the second external USB port is
disabled. The over-current detection is shared between the second external USB port and
the AGP connector.
USB works only if the USB interface has been enabled within the HP Setup program.
Currently, only the Microsoft Windows 95 and Windows 98 operating systems provide
support for the USB.
The Microsoft Supplement 2.1 software (called
USBSupp.exe
), which provides support for
the Universal Serial Bus for Windows 95 Software Release (SR) 2.0, can be obtained from
the Hewlett-Packard World Wide Web site (refer to the section “Access HP World Wide Web
Site” in the chapter “System Overview.”
Summary of Contents for X Class 500/550MHz
Page 6: ...6 Contents ...
Page 8: ...8 Figures ...
Page 15: ...15 1 System Overview ...
Page 66: ...66 Chapter2 System Board Devices on the ISA Bus ...
Page 96: ...96 Chapter3 Interface Boards and Mass Storage Drivers Connectors and Sockets ...
Page 134: ...134 Chapter5 Tests and Error Messages Beep Codes ...
Page 135: ...135 A Regulatory Information and Warranty ...
Page 146: ...146 AppendixA Regulatory Information and Warranty HP Hardware Warranty ...