Apple 3400 Series manual Connecting Scsi devices

Connecting SCSI devices

A SCSI device is any product—including hard disk drives, CD-ROM drives, and scanners—that communicates with your computer by means of a standard electronic interface. (SCSI stands for Small Computer System Interface.) You can attach up to seven SCSI devices to your computer by linking them together in a chain that starts at your computer’s SCSI port.

To connect a SCSI device to your Macintosh PowerBook, you need an Apple HDI-30 SCSI System Cable or equivalent. This cable is light gray, is about 19 inches long, and has 29 pins (one “missing” pin).

Refer to the manuals that came with your SCSI devices for instructions on installing any necessary software, setting SCSI ID numbers, and connecting SCSI cables and SCSI terminators. Refer to the illustrations on the next page for the proper positioning of SCSI terminators. A SCSI chain of devices must include a terminator attached to the first and last devices in the chain (but nowhere else in the chain). Some devices include internal terminators. Your Macintosh PowerBook is internally terminated.

The names and the part numbers of the cables mentioned in this chapter are the following:

Type of connection	Name of part		Part number
From your computer to	Apple HDI-30	SCSI System Cable	M2538**/A
a SCSI device
From SCSI device to	Apple SCSI Peripheral Interface Cable		M0207
a SCSI device
For SCSI disk mode	Apple HDI-30	SCSI Disk Adapter Cable	M2539**/A

WARNING When connecting SCSI equipment, always turn off power to all devices in the chain, including your computer. If you don’t, you could lose information and damage your equipment.

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