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3.
4.
SECTION VII.
TYPES 204B-ll, 204B-12 MAGNETIC TAPE UNITS
stalled PDT instruction by turning one of the rotary thumbwheel TAPE
ADDRESS switches to the appropriate position.
Re-enter the address of the PDT op code into the sequence register.
Press the control panel RUN button.
The program should then continue.
If the program does not continue and the operator is
not familiar with the run, a restart from the beginning of the program or from a logical restart
point should be initiated.
Selecting Magnetic Tape Addresses
If a program is reading or writing on a tape and the operator wishes to select another tape
by means of the appropriate TAPE ADDRESS switch, he must be aware of the following restric-
tion: If, while a TAPE ADDRESS switch is being manipulated, it momentarily passes through the
address of a tape that is being read or written, an error will result.
To avoid this situation, the
operator should address all tapes prior to starting the program.
If a situation should arise later
that requires selecting a logical tape assignment during a program run, the operator should first
press the STOP button on the central processor control panel, dial the tape assignment in the
appropriate TAPE ADDRESS switch, and then press the RUN button to continue.
7-7
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