Programming instructions

POWER
SINGLE STEP
SINGLE INSTRUCTION
REPEAT
SPEED
Console Switches Function
ADDRESS A group of 13 switches which establishes
the memory address for the START, EX-
AMINE, and DEPOSIT operations.
ACCUMULATOR
A group of 18 switches, the setting of which
determines the word to be placed in memory
by the DEPOSIT and DEPOSIT NEXT opera-
tions, or to be placed in the AC under
program control.
Controls the primary power to the computer
and all external devices attached to it.
Causes the computer to stop at the comple-
tion of each memory cycle. Repeated opera-
tion of CONTINUE while this switch is on
will step the program one cycle at a time.
Causes the computer to stop at the comple-
tion of each instruction. Repeated operation
of CONTINUE while this switch is on will
step the program one instruction at a time.
When both switches are on, SINGLE STEP
takes precedence over SINGLE INSTRUC-
TION.
Causes the operations initiated by pressing
CONTINUE, EXAMINE NEXT, or DEPOSIT
NEXT, to be repeated as long as the key is
held on. The rate of repetition is controlled
by the setting of the SPEED knobs.
Two controls that vary the REPEAT interval
from approximately 40 microseconds to 8
seconds. The left knob is a five-position
coarse control, the right knob a continuously
variable fine control. For both knobs, slowest
speed is obtained in extreme left position.
Console Light
Indication
ACCUMULATOR
MEMORY BUFFER
LINK
MEMORY ADDRESS
INSTRUCTION
PROGRAM COUNTER
RUN
FETCH, DEFER, EXECUTE, BREAK
The contents of the AC.
The contents of the MB.
The contents of the Link.
The contents of the MA register.
The contents of the IR.
The contents of the PC.
The computer is executing instructions.
The primary control state of the next mem-
ory cycle.
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