AM-64x DAT High Capacity Tape Drives
Page 9
PDI-00649-00, A01
ON
1
2
3
4
5
6
7
8
HP 4mm DAT Option Switches
AMOS Default Configuration
SWITCH 1 SWITCH 2 MEANING
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On On Compression enabled at power-on, with host control
On Off Compression enabled at power-on, no host control
Off On Compression disabled at power-on, the host is allowed to
control compression
Off Off Compression disabled at power-on, no host control
SWITCH 3 MEANING
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On The Media Recognition System is disabled. All DDS tapes will be treated
the same, whether they possess the Media Recognition Stripes or not.
Off The Media Recognition System is active. This is the default. Non-Media
Recognition System tapes are treated as if they are write-protected.
SWITCHES 4 - 8
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Switches 4-8 are used to specify drive connectivity and functionality according to host or
customer requirements. The majority of functions controlled by these switches concern
UNIX software and operational compatibility with SUN, IBM, and DEC computer systems.
The AMOS default setting is switches 4-8 set to
on
.
Figure 6 - AM-649-00 and -01 Configuration Option Switches
SCSI BUS TERMINATION
To function properly, the SCSI bus on your computer must be terminated at each end of the cable. The
SCSI controller terminates one end of the bus; the opposite end of the bus can be terminated in one of
two ways: 1) using the preferred method—an external terminator, or 2) installing on-board terminators in
the peripheral that's at the other end of the SCSI cable. You should use method 2 only if, for some
reason, you cannot use an external terminator in your installation.
Termination Resistor Pack Locations
Under most conditions, if the new peripheral device has on-board terminators they should be removed!
The terminators should be left installed only if you are not using an external terminator, and the drive
you're installing is physically connected as the last device on the SCSI cable.
AM-649-00 and -01 drives (HP models C1536A, C1533A, and C1599A) DO NOT HAVE ON-
BOARD TERMINATORS. If these drives are used without an external terminator, they cannot
be the last device on the SCSI cable. Another device must be attached as the last device on the
SCSI cable and configured to provide SCSI bus termination!
