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•
The interval timer switch is located
on logic page PA 111.
Description
If the interval
ti~er
feature is
installed on the 2030, the interval
timer switch controls its operation.
If
the interval timer switch is off, the
timer control latch is held on to block
C-counter drive pulses, thus preventing
timer advance.
MODE CONTROL PANEL (FIGURE 6- 6)
RATE SWITCH
•
Three position switch with process,
instruction step, and single cycle
positions.
•
Lights test light on operator panel
if in instruction step or single
cycle position.
•
The Rate Switch controls the manner
the CPU processes instructions.
•
The Rate Switch is located on logic
page PA 081.
INSTR
(INSTRUCTIO~
STEP POSITION:
When
the Rate Switch is in the Instr Step
position, one complete instruction,
including interrupts, is executed each
tim~
the start key is pressed.
When the
clock stops after executing an instruc-
tion, the B and A-register lights dis-
play the address of the next
instruction.
ROS CONTROL
~~HIBIT ~ROICESr ~~;N
STOP
\
/
ADDRESS COMPARE
ROAR SYNC --\ROC
1
ESr~~~pDElAYED
ROARSTOP~ ~SARSTOP
EARLY
JI\:,--SAR
RESTART
ROAR STOP
~
ROAR RESTART
ROAR
ROAR RESTART
WITHOUT RESET
RESTART
STOR BYPASS
RATE
INSTR
PROCESS
SINGLE
STEP \
I /
CYCLE
CHECK CONTROL
DISABLE
PROCESS
STOP
DIAGNO=--S I Z:START
Figure 6-6.
Mode Control Panel
If the instruction is an I/O opera-
tion, then the I/O operation is complet-
ed and interrupts are pending before the
CPU clock is stopped.
SINGLE CYCLE POSITION:
When the Rate
Switch is in the Single Cycle position,
the CPU advances 1:;y oneRCS cycle each
ti~e
the start key is pressed.
Thus,
the CPU processes instructions in one
microsecond increments, I/O instructions
included.
This means that I/O data
overrunS may occur in this mode.
PROCESS POSITION:
When the Rate switch
is set at the process position, the CPU
clock is allowed to run at the one
microsecond rate until some condition
causes a stop.
This is the position in
which customer's will process data.
ADDRESS COMPARE SWITCH
•
Determines function to te performed
by the address match circuit.
•
If the Address Compare switch is at
other than the process pOSition, the
~indicator
on the operator panel
is lighted.
•
SWitches A, B, C, and D are compared
with either ROAR or SAR as defined
by the Address Compare switch.
6-15
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