Manual Number: 00431-220-5
Page 3-2
SB586T Series Manual
In 16-bit SCSI wide chains, connect one end of the 68-pin cable to the CPU board, then connect the
SCSI wide devices anywhere else on the cable. To add an 8-bit SCSI device to this chain, place the
appropriate adapter on the cable connector and connect the narrow SCSI device to the adapter
(
Figure 3-1
). The necessary signals for the 8-bit device are channeled through the adapter to the
SCSI device. The additional 16-bit signals are not carried through the adapter and are sent down
the SCSI chain. Because of these extra signals, you must place a 16-bit device with termination
resistors at the end of the chain to ensure proper termination of all SCSI signals.
)HPDOHIHPDOHDGDSWHU
ELWWRELW
SLQ6&6,ZLGH
ELWULEERQFDEOH
Figure 3-1: 68-to 50-Pin Adapter
If you need a straight 8-bit SCSI chain, place the 68-pinto50-pin male-to-male adapter on the 68-
pin connector on the CPU board. From there, you may run a standard 50-pin ribbon cable to con-
nect the 8-bit SCSI devices as needed (
Figure 3-2
).
6WDQGDUGSLQ
6&6,FDEOH
0DOHPDOHDGDSWHU
SLQWRSLQ
Figure 3-2: Straight 8-Bit SCSI Chain
The SCSI controller is assigned SCSI ID 7. It is not permanently terminated and therefore may
appear anywhere on the SCSI cable. A SCSI device at each end of the cable must be terminated
using termination resistors to insure the integrity of the SCSI signals. If the controller is at an end
of the cable, you must terminate the device using SCSI utility software.
If your system does not already have a driver for the new SCSI device, you will need to install one
as described in the following section.
SCSI Device Drivers
The SB586TS and SB586TS2V both have an onboard SCSI controller. This controller comes with
supporting SCSI utility software that manages such details as controller termination. When booting
your system, you have the option to configure the drivers or to boot normally.
Most operating systems automatically recognize devices properly installed in the SCSI port. This
recognition allows you to install the operating system from a SCSI-type CD ROM. After installing
the operating system, follow the instructions accompanying the SCSI device(s) to install any re-
quired drivers.
If your system does not recognize the SCSI CD ROM, carefully check for ID conflicts and proper
device termination.