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SECTIONII.
OPERATOR'S CONTROL PANEL
4.
The central processor cycle counter is reset;
5.
The memory address register (MAR) and the memory local register (MLR)
and their associated displays (i. e., ADDRESS and CONTENTS, respectively)
are cleared to zeros;
6.
The system is set to the two-character addressing mode;
7.
Item-mark trapping is reset;
8.
All interrupt demands and peripheral interrupt allow functions are turned
off; and
9.
An "initialize" signal is sent to all peripheral controls causing them to re-
lease read/write channels, to clear stored instructions, to clear error
indicators, to inhibit interrupts during initialization, and to assume the
following states:
Printer Control
Tape Control
Card Reader and/ or Punch Control
Same response as to local "clear,"
plus error indicator reset.
Error indicators reset.
Stored instruction cleared, error
indicators reset, "alphanumeric"
mode entered.
The operator should exercise caution in using the INITIALIZE button following machine
stop conditions (e. g., error-check conditions, program or machine malfunctions, etc.).
It is
extremely important that the operator use discretion in clearing error-check conditions and
performing restart procedures.
If the INITIALIZE button is depressed at any time during the
operation of the program or during either a normal or abnormal stop condition, the resulting
eight conditions outlined above may destroy pertinent program information.
In such an event,
it may be necessary to rerun the program from the beginning.
RUN Button
The RUN button is illuminated when the system is in the RUN mode and turned off when in
or waiting to enter the STOP mode.
The RUN mode can be entered by depressing the RUN button,
unless a parity check or program check is stored.
A stored check must be cleared before the
RUN button is effective.
Depressing the RUN button causes the AC OFF and RESET DC OFF
switches to be overridden when the central processor is energized and no check conditions exist.
In the RUN mode, the system executes (without manual intervention) stored program in-
structions under control of the sequence register.
INSTRUCT Button
2-7
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