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Installing the Host
Adapter and SCSI
Devices
Installing the AHA-2944UW
Follow these instructions to install the AHA-2944UW:
1
Turn
OFF
power to the computer and peripheral
devices, and disconnect the power cords.
2
Remove the cover from the computer case.
3
Locate an unused 32-bit PCI expansion slot that sup-
ports bus master data transfers, then unscrew and
remove the metal bracket that covers the card-slot
opening. (Save the screw to use when securing the
host adapter in your computer.)
PCI slots are shorter than ISA or EISA slots and are
typically white. Usually there are three PCI slots.
(One of these may be a shared slot into which you can
insert either an ISA/EISA board or a PCI board.)
4
Insert the AHA-2944UW in the PCI slot. Press it down
firmly so that the contacts are securely seated in the
slot.
5
When the AHA-2944UW is firmly seated in the slot,
secure the metal bracket of the host adapter with the
screw you removed in step 3.
Do not replace the computer cover or reconnect your com-
puter and peripherals to their power sources yet!
Assigning SCSI ID Numbers
The AHA-2944UW and each device connected to it must
have a unique SCSI ID number ranging from 0 to 15.
We recommend that you leave the AHA-2944UW host
adapter set to its default setting of SCSI ID 7. If you need
to change the AHA-2944UW SCSI ID, see Running
SCSISelect on page 8. If you need to change the SCSI ID
on a hard disk drive or another SCSI device, refer to the
device’s documentation.
Note:
If you plan to boot your computer from a
SCSI device attached to the AHA-2944UW host
adapter, and the device is not assigned the low-
est installed SCSI ID, set the Boot Target ID set-
ting in the SCSISelect utility to correspond to the
SCSI ID of the device you are booting from (see
Using SCSISelect on page 5).
Setting SCSI Termination
SCSI termination is controlled by a set of electrical resis-
tors called terminators. Terminators must be installed (or
enabled) at the two extreme ends of the SCSI bus. All
devices between the ends must have their terminators
removed (or disabled).
Terminating the AHA-2944UW
Termination on the AHA-2944UW itself is controlled by
software commands via the SCSISelect utility. The default
setting is Automatic, which works like this:
■
If the AHA-2944UW detects that a cable is attached to
one SCSI connector, it enables its terminators (the
AHA-2944UW is at the end of the SCSI bus).
■
If the AHA-2944UW detects that cables are attached
to two connectors (either the two internal connectors
or one internal and one external connector) it disables
its terminators (the AHA-2944UW is in the middle of
the SCSI bus).
We recommend that you leave the AHA-2944UW set to
its default setting of Automatic. If you need to manually
set AHA-2944UW termination run the SCSISelect Utility,
as described on page 8, and select a setting as indicated
in this table.
AHA-2944UW
Termination
Devices Connected to AHA-2944UW
Low
High
68-pin internal connector only
ON
ON
68-pin external connector only
ON
ON
68-pin internal and 68-pin external connectors
OFF
OFF
50-pin internal connector only
ON
ON
50-pin and 68-pin internal connectors
OFF
ON
50-pin internal and 68-pin external connectors
OFF
ON