AM-64x DAT High Capacity Tape Drives
Page 13
PDI-00649-00, A01
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SCSI subsystems attached to the main system should not have any additional devices supplying
termination power to the SCSI bus. Termination power for the bus should be supplied by one
source only!
The AM-649-01 (8GB) DAT drive has a jumper on the rear to disable term power, but the AM-
649-00 (4GB) DAT drive has its term power permanently enabled! Although Alpha Micro
always recommends only one source of termination power to the bus, this particular exception
has thus far proven not to be a problem—as long as the drive is installed in the main system and
connected to the same DC power supply as the other SCSI devices on the bus. However,
performance of this drive may become unstable if it's mounted in an external subsystem chassis
and/or connected to a DC power supply other than the main system supply!
The SCSI host controllers on AM-137, AM-190, and AM-540 boards are permanently configured
to supply termination power to the SCSI bus. On Roadrunner boards, the termination power
feature can be enabled or disabled by setting a jumper. As of July 26th, 1994, Alpha Micro began
configuring all Roadrunner boards with termination power enabled. See the Roadrunner
installation instructions for information on how to configure the termination power jumper.
For information on how to configure terminator power on SCSI hard disk and magnetic tape peripherals,
see the following documents:
•
Each SCSI disk drive shipped by Alpha Micro has a one page notice with jumper configuration
information, including instructions on how to configure termination power.
•
AM-62X SCSI 1/4" Streaming Tape Drive Installation Instructions, PDI-00625-00, revision A07
or later.
DAT INSTALLATION—EAGLE AND AM-1600 DESKSIDE COMPUTERS
The owner's manuals for Eagle and AM-1600 deskside computers contain their own sets of instructions
for installing SCSI peripherals. However, you will still need to follow all the instructions in this
document dealing with software configuration and actual use of your DAT tape drive.
DAT INSTALLATION—RACK MOUNT AND PEDESTAL COMPUTERS
The following sections describe how to install the DAT drive into AMOS computers using both rack
mount and pedestal enclosures. The basic installation procedure is the same for both pedestal and rack
mount computers:
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Remove your front bezel.
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Create a cutout in your bezel to support the DAT drive.
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Build the DAT drive mounting assembly.
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Install the DAT drive mounting assembly in your computer.
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Attach the SCSI interface and power cables.
