SCSI Technical Supplement

When configuring SCSI devices, you should consider the following issues:

  • Jumper block and DIP switch settings for device IDs (used primarily on internal drives)

  • The overall length of the SCSI daisy-chain

  • The method used for terminating the ends of a SCSI daisy-chain

See the following sections for details.

Jumper Block and DIP Switch Settings for Device IDs

Each SCSI device must have a unique device ID to distinguish itself from other SCSI devices connected to the same SCSI channel. Narrow SCSI (50-pin data cable) devices use a set of three jumpers or DIP switches to set the device ID. Wide SCSI (68-pin data cable) devices use a set of four jumpers or DIP switches to set the device ID.

The device ID is set in binary (base ...

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