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THE SINGER COMPANY
KEARFOTT DIVISION
Y240A200M202
REV.
-
The computer will remain stopped until the RUN/STOP switch is reset (i.e., set to STOP and then
back to RUN). The indicator lights display either the RUN or the STOP state.
2.6.5 HALT SWITCH AND INDICATOR
When the switch is in the OFF position and the Halt instruction is executed by the computer, the
instruction is interpreted by the CPU to be a NOP. When the switch is in the ON position, and the
computer executes a Halt instruction, further execution is inhibited. Subsequently, the RUN
indicator goes off, and the HALT indicator illuminates.
2.6.6 RESET/MASTER AND DISPLAY SWITCHES
Operation of the MASTER RESET pushbutton will cause the generation of J1 Initialization signal,
which resets the CPU and registers to
~he
initial power turn-on state.
The DISPLAY RESET pushbutton is used to reset all display registers in the CCU to verify the
receiptof new data. When this button is pressed, all DATA indicator lights go off.
Upon release of
this button, the static register contents are displayed.
2.6.7 PROGRAM SWITCHES 0 THRU 7
These eight toggle switches provide control to the CPU switch inputs. The programmer can make
use of these switches with aJGW instruction to control branch points within the program.
2.6.8 MEMORY WRITE SWITCH AND INDICATOR
With this switch in the ON position, the MEMORY WRITE indicatorgoes on and words can be
loaded into protected memory. When OFF, loading into protected memory is inhibited.
2.7 PANEL RUN SWITCH
This switch must always be set to ON when using the CCU.
2.8 INHIB PC SWITCH
This toggle switch is used to inhibit incrementing the Program Counter in the computer.
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