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Connecting external SCSI devices
Your computer has a port for connecting devices that use the Small Computer
System Interface (SCSI, pronounced “skuh-zee”). The SCSI port permits
high-speed communication between the computer and the device. The SCSI
icon appears above the port on the computer’s back panel.
You can connect SCSI devices to the SCSI port in a chain. The first device in
the chain plugs into the SCSI port; the second device plugs into the first
device, and so on. SCSI devices commonly used with the Macintosh include
hard disk drives, CD-ROM drives, scanners, some printers, and tape or
cartridge backup drives.
You can attach up to seven external SCSI devices to the SCSI port. However,
if you have a second internal hard disk connected to this SCSI chain you can
attach only six external SCSI devices to the port. All SCSI devices connected
to this chain must have their own unique ID number.
Note: In addition to the external SCSI port, your computer has a second,
internal SCSI connection. The internal hard disk drive that came with the
computer is connected to this internal SCSI interface. If your computer came
with a CD-ROM player, it is also attached to the internal SCSI interface. An
authorized Apple dealer or service provider can attach additional devices to
the internal SCSI interface. For more information about the SCSI interfaces,
see the Te ch n i ca l In fo r m a t i o n booklet that came with your computer.
All devices on the same SCSI chain must have unique ID numbers, but
devices on different SCSI chains may use the same SCSI ID number. (For
example, you could have a CD-ROM player with ID number 3 connected to
the internal SCSI chain and a tape drive with ID number 3 connected to the
external SCSI chain.)
IMPORTANT
“Before You Connect a Device” and “Connecting a SCSI Device,”
both later in this section, contain general instructions for attaching SCSI
devices to your computer. Be sure also to follow the specific instructions that
came with your external hard disk drive or other SCSI device when
connecting the device to your Macintosh.
SCSI port
SCSI icon
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Chapter 3