Service manual

Appendix C Functional Description C-11

■ Supports 16 SCSI addresses:

■ Targets 0 - 6 and targets 8 - F for devices

■ Target 7 reserved for motherboard SCSI host adapter

■ Supports up to three internal SCSI drives:

■ SCSI hard drive target 0 (lower drive slot)

■ SCSI hard drive target 1 (upper drive slot)

■ SCSI CD-ROM drive target 6 or SCSI tape drive target 5

■ External 8-bit and 16-bit SCSI devices supported through a 68-pin SCSI connector

C.1.8.2 SCSI Cabling and Configuration

When mixing 8-bit and 16-bit SCSI devices on the same physical SCSI bus, follow

these cabling and configuration guidelines to insure proper device addressing and

operation:

■ If all external mass storage devices use 68-pin connectors, connect all non-Sun

devices to the Ultra 2 Series system first, followed with Sun devices. Sun devices

use autotermination.

■ If external mass storage devices consist of 68-pin Sun devices and 50-pin devices,

connect the Sun 68-pin devices to the Ultra 2 Series system first and terminate the

daisy chain with the 50-pin device and its terminator.

The following figure provides an illustrated summary of cabling and configuration

guidelines.

FIGURE C-3 Connecting External Mass Storage Devices

Ultra 2

Ultra 2 Non-Sun Sun

Sun

50-pin

68—68

68—50

Adapter cable

Terminator

Non-Sun

series device device device