Apple 190 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 6 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 (the same color as desktop Macintosh computers), 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 below 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 not internally terminated.

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

Type of connection	Name of cable	Part number
From your computer to	Apple HDI-30 SCSI System Cable	M2538LL/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	M2539LL/A
To connect an	PowerBook Video Adapter Cable	M3927LL/A
external monitor

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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