Fastraid Port - HP X Class 500/550MHz Reference Manual

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.
34 Chapter 2