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Chapter 2
System Board
Accessory Board Slots
• PIIX4E chip, bridge between the PCI and the ISA, USB and IDE buses.
• Two flash ROM sockets for 256 KB or 128 KB ROMs.
• Audio chip (AD1816 from Analog Device).
• IO APIC interrupt controller (Intel 82093).
The ISA bus interface is explained in the section “ISA Bus Interface” in this chapter.
FastRaid Port
A FastRaid port is provided on the system board through the ARO (RAIDport) connector.
This connector, aligned with the PCI slot 3, is to be used by a specific PCI accessory board,
called the ARO board. This board uses the ARO connector on the system board to directly
connect a SCSI hardware accelerator to the embedded Adaptec AIC 7880 controller. The
SCSI hardware accelerator chip, located on the ARO board, uses local memory to perform
hardware caching and also accelerates SCSI data striping when two hard disk drives are
used.
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 ...