About SCSI I/O bus support
3-2
014–002250–01
The AViiON 5500 and 550 SCSI interfaces support both SCSI–2
and SCSI–1 devices. References in this manual to “SCSI” apply
to both the SCSI–1 and SCSI–2 specification.
This chapter refers to the microprocessors that manage
individual SCSI buses as controllers. These controllers, and/or
the printed–circuit boards that contain them, are sometimes
referred to as SCSI adapters, adapter boards, or
controller/adapters; the distinction should not affect your
configuration. The term channel is sometimes used when
referring to either a SCSI bus, SCSI adapter, or SCSI controller.
About SCSI I/O bus support
The Small Computer System Interface (SCSI) is an ANSI-defined
standard for computer and peripheral interconnection.
Every AViiON 5500 and 550 series computer includes a SCSI bus
controller on the system board. This bus is set to a single–ended
interface by default; it supports internal drives, plus (optionally) a
limited number of external drives.
Your system may also include one or two optional SCSI expansion
adapter boards installed in the expansion slots shown in
Figure 3–1. Each expansion SCSI adapter board provides two
additional SCSI buses; qualified personnel can configure each bus
to use a single–ended or differential interface. To install a SCSI
option board and set singled–ended or differential operation for its
channels, refer to Chapter 7.
Figure 3–1 shows the location of all possible SCSI connectors on the
rear panel of your computer. All AViiON 5500 and 550 computers
include an external connector for the integrated SCSI bus. If your
system has an optional SCSI I/O adapter board, the rear panel
contains two additional SCSI connectors per board. If you do not
have SCSI expansion boards, their connector slots remain empty or
contain another external I/O option.
Some notes
about
terminology.
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