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SECTION VII.
TYPES 204B-ll, 204B-12 MAGNETIC TAPE UNITS
MANUAL TAPE CONTROL FUNCTIONS
The manual controls (see Figure 7-1) for the Type 103 Tape Control are located at the top
front of the logic drawer which houses the tape control circuitry.
All functions (except the tape
control clear, which is described below) are located on this panel.
The four switches on this
panel provide the means for arbitrarily assigning anyone of four logical tape addresses to any
one of the four tape units (stations zero through three) connected to the tape control.
Tape Address Switches
The four rotary thumb wheel TAPE ADDRESS switches are used to assign logical tape
addresses to physical tape units.
Each switch (one per TAPE STATION) has four positions
which are numbered zero through three and one position which is blank.
Anyone of the logical
tape addresses zero through three may be assigned to anyone of the physical tape units on-line
to the central processor, provided that each logical address is assigned to only one tape unit.
System behavior is unspecified if more than one physical tape unit is assigned to the same
logical address.
When the blank position is used, the tape drive assigned to this position
appears "inactive," i. e., not accessible to the program.
Tape Control Unit Clear
This function is activated by pressing the INITIALIZE button on the central processor
control panel (see page 2-6).
Pressing the INITIALIZE button stops runaway read or write
conditions in the tape drive, terminates all operations in progress in the tape control, and
prepares the control to receive any new instructions.
If the tape control is in a normal stopped
state, pressing the INITIALIZE button will reset stored read/write error functions.
TAPE UNIT CONTROLS AND INDICA TORS
The controls and indicators on the control panel of a Type 204B-ll or 204B-12 are shown
below.
A description of these controls and indicators follows:
7-2
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