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3803 Operator's Panel
Toggle Svvitches
The Switching features include sets of toggle switches to make the tape units
individually available to each of the tape controls in the switching configuration.
Switches are arranged in groups of eight on the operator panels of Tape Controls
1
and 2. See Figure 10. Switches in each of the groups on Tape Control
1
correspond to Tape Units 0 - 7 and switches in each group on Tape Control 2
correspond to Tape Units 9 - F.
A switch in the
ON
position makes the corresponding tape unit available to the
tape control for that group of switches. When the switch is
OFF,
the tape unit is
not available. An attempted selection with the switch
OFF
results in a
'Non-existent' status for that address.
Switches are arranged on Tape Controls
1
and 2 in tape switching configurations
as follows:
Switches on Tape
Switches on Tape
Configuration
Control 1
Control 2
1 x 8
None
None
2 x 8
16
None
3 x 8
24
None
4x8
32
None
2 x 16
16
16
3 x 16
24
24
4 x 16
32
32
Switches for a 4 x 16 configuration are as follows:
Switches on Tape Control 1
Switches on Tape Control 2
Tape Control 1
Tape Control 3
Tape Control 1
Tape Control 3
to
to
to
· to
Tap_e Units 0-7
Ta_Q_e Units 0-7
Ta_Q_e Units 9-F
Ta_Q_e Units 9-F
Tape Control 2
Tape Control 4
Tape Control 2
Tape Control 4
to
to
to
to
Tape Units 0-7
Tape Units 0-7
Tape Units 9-F
Tape Units 9-F
Note: Before turning a tape unit switch
OFF,
permission should be obtained from
the operating system. All outstanding operations or pending status should be
completed.
After receiving permission from the system operator, placing the switch in the
OFF
position will disable that path when
CLOCK OUT
becomes inactive. On some
operating systems, it may be necessary to stop the system to deactivate
CLOCK
OUT.
If there is no tape unit physically attached to a particular address, all paths
to that address must be disabled. Results of addressing a tape unit that is not
connected (switch in
ON
position and no tape unit attached) to a particular
address are unpredictable.
Section 3: Subsystem Operator Functions
3 3
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