Working with Internal Drives
A flat-ribbon signal cable connects internal diskette drives and
certain tape drives.
This cable has two connectors. The primary diskette drive
installed in your server (usually known as drive A) must be
attached to the diskette drive connector that is at one end of the
ribbon cable. The unique connector at the opposite end of this
ribbon cable plugs into the system board.
Note: If you want to install more than one diskette drive, you
must purchase a four-wire, Y-cable that provides two
power connectors.
Another cable connects internal SCSI devices. This SCSI cable
has five connectors that connect to SCSI devices. A sixth
connector attaches to the UltraSCSI adapter.
The internal SCSI cable is attached the CD-ROM drive, the
UltraSCSI adapter and a hard disk drive if preinstalled. This
cable also has additional connectors for installing other SCSI
devices.
For help in selecting drives, cables, and other options for your
server, do one of the following:
Within the United States, call 1-800-IBM-2YOU (1-800-426-2968),
your place of purchase, or your IBM reseller.
Within Canada, call 1-800-565-3344 or 1-800-465-7999.
Outside the United States and Canada, contact your IBM
HelpWare number, place of purchase, or IBM reseller.
SCSI IDs
If you install additional SCSI devices, you must set a unique
identification (ID) for each SCSI device that you connect to your
server. This enables the UltraSCSI adapter to identify the devices
and ensure that different devices do not attempt to transfer data at
the same time.
The UltraSCSI adapter in your server supports SCSI IDs 0 to 15.
ID 7 is reserved for the adapter. The scanning sequence for
(preinstalled) SCSI devices proceeds from the lowest SCSI ID to the
highest SCSI ID, starting with 0. If your server comes with a
Chapter 3. Installing Options
79