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28 Appendix
Appendix A
• If you are booting your computer from a SCSI hard disk drive connected to the
ASUS LS99 SCSI Card, the Boot SCSI ID setting in the SCSISelect utility must
correspond to the SCSI ID of the device from which you are booting. By default,
the Boot SCSI ID is set to 0. We recommend that you do not change this setting.
• In Windows
®
95/98, you can use the Device Manager to determine which SCSI
ID is assigned to each installed SCSI device.
Terminating the SCSI Bus
To ensure reliable communication on the SCSI bus,the ends of the SCSI bus must be
properly terminated. This is accomplished when the device at the end of each cable,
or the end of the cable itself, has a terminator installed (or enabled). Terminators
must be removed, or termination must be disabled, on devices between the ends of
each cable.
Since the method for terminating a SCSI device can vary widely, refer to the device’s
documentation for instructions on how to enable or disable termination. Here are
some general guidelines for termination:
• Internal Ultra160 and Ultra2 SCSI devices come from the factory with termination
disabled and cannot be changed. Proper termination for these internal devices is
provided by the built-in terminator at the end of the 68-pin internal LVD SCSI
cable.
• Termination on Wide SCSI, Narrow SCSI, and Ultra SCSI devices usually is
controlled by manually setting a jumper or a switch on the device, or by physically
removing or installing one or more resistor modules on the device.
• Termination on most external SCSI devices is controlled by installing or removing
a SCSI terminator. However, termination on some external SCSI devices is
enabled or disabled by setting a switch on the back of the SCSI device.
• Most Ultra SCSI devices come from the factory with termination enabled.
Most problems can be resolved by following the recommendations in the
Troubleshooting Checklist below. If you still experience prob-lems after following
the recommendations, continue with the rest of this section.