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3490 Tape Subsystem Controls for Models C10, C11, C1A, C22, and
C2A
The 3490E Model CXA control unit operator panel 1 and the 3490E Model CXA
drive unit operator panel 2 (see Figure 25 on page 36) are accessible to the
operator by opening the front door of the frame containing the tape subsystem to be
accessed.
When 3490E subsystems are attached to the 3494, the following 3490E functions
change:
Drive control
The loading and the unloading of volumes are controlled by the library
manager. The 3490E subsystem communicates with the library manager to
update the database with the drive status and the cartridge location
information.
Message displays
The library manager controls which messages are displayed to prevent the
messages from getting out of synchronization with the library manager
during Manual mode operations.
Attention interrupt
The library manager can use the communication path to the 3490E
subsystems to send information to the host.
For more information on 3490E controls and indicators, see
IBM 3490 Magnetic
Tape Subsystem Enhanced Capability Models C10, C11, C1A, C22, and C2A
A06C0059
Figure 24. Library Manager
Chapter 2. Controls and Indicators 35