2.4 Machine Sp ecic Instructions 21
Cho osing a SCSI ID
Before connecting the
DAT-Link
,you need to check which SCSI ID's are already in
use on your system. To do this, you need to login as
ro ot
and run the IBM system
manager's tool:
smit devices
You should then see a menu on the screen listing a number of options. Use the
#
key to movedown the list until
List All Dened Devices
is highlighted, and
then press return. The system will then compile a list of devices. You can scroll
through this list using the
"
and
#
keys. Lo ok for entries that have a third column
that contains four numbers of the form:
00-08-00-##
. Here are some examples
of SCSI devices you may see:
scsi0 Available 00-08 SCSI I/O Controller
cd0 Available 00-08-00-50 CD-ROM Drive
rmt1 Available 00-08-00-60 2.3 GB 8mm Tape Drive
hdisk0 Available 00-08-00-00 857 MB SCSI Disk Drive
rmt0 Available 00-08-00-40 150 MB 1/4-Inch Tape Drive
If you havemultiple SCSI I/O controllers on your machine you may see additional
entries for scsi1, scsi2, etc. In this case the \08" ab ovemay be replaced by another
numb er.
The second last digit of the device number gives the SCSI ID of the device. For
example, in the list ab ove, SCSI ID's 0,4,5, and 6 are in use. Also, the IBM always
uses SCSI ID 7 for the controller. Thus ID's 1,2, and 3 would be free to b e used by
DAT-Links
. Note that although the
DAT-Link
's ID switch go es up to 9, settings 8
and 9 are reserved for factory testing.
Once you have determined which SCSI ID's are free, you can exit
smit
by pressing
the
F10
key.
Connecting the
DAT-Link
The next step is to connect the
DAT-Link
to the computer. Since it is necessary to
unterminate the SCSI bus temp orarily, it is recommended that you shut-down and
turn o the computer before making the connection.
The
Options
switches on the rear of the
DAT-Link
should be set with switches 1
and 2 up, and switches 3 and 4 down. This places the
DAT-Link
into a special
emulation mo de necessary to communicate with the RISC/6000's software drivers.
Then connect the
DAT-Link
to the computer using the SCSI cable. If the
DAT-Link
is the last device on the SCSI bus, b e sure to connect the provided SCSI terminator
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