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SECTION VIII.
OPERATOR'S CONSOLE
S (Execute One Instruction) Key
r--
Striking the S key is exactly equivalent to pressing the INSTRUCT button on the control
panel.
After the character S is typed out, the carriage returns and the next instruction is per-
formed.
It should be noted that if the instruction performed is a PCB instruction which tests
the console for a busy condition, the instruction finds the console "not busy. "
If
the last A or P operation designated the sequence register, striking the R key after the
S key causes the console to type out the address and the op code of the next instruction to be
performed.
Therefore, the operator can trace program flow by alternately striking the Sand
the R keys.
SYSTEM CLEAR Button
The SYSTEM CLEAR button is effective only
if
the STOP button has been pressed and the
console is not in the logging mode.
The carriage need not be returned, however, to perform
a system clear operation.
Pressing the SYSTEM CLEAR button results in the following:
1.
The console releases its read/write channel,
if
any is assigned;
2.
Central processor operations terminate at the end of the current memory
cycle, and the RUN indicator is turned off;
3.
The central processor cycle counter is reset;
4.
The PARITY indicator is turned off;
5.
The carriage is returned; and
6.
The PROGRAM indicator is turned off.
Peripheral operations (except typing and magnetic tape operations) are allowed to be
completed.
If
the STOP indicator does not illuminate after the carriage has been returned, a
peripheral device must contain a stored instruction.
INITIALIZE Button
The INITIALIZE button is effective only
if
the STOP button has been pressed and the console
is not in the logging mode.
The carriage need not be returned to perform an initialize operation.
When held down, this button illuminates the lamps in the SENSE, STOP, RUN, TYPE, ADDRESS
MODE, PARITY, and INTERRUPT indicators to provide a filament test.
Pressing the INI-
TIALIZE button results in the same set of conditions as those described on page 2-6, "INITIALIZE
Button, " and also returns the carriage.
TYPE Button
The indicator in the TYPE button is not illuminated when the console is in the control mode.
It is illuminated only when the program executes a PDT read instruction to the typewriter in
the peripheral mode.
8-12
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