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positions are not indicated on the indicator lights
until the information is deposited in memory.
time the information from these switches appears on the
data bus.
The high order byte of address switches is
labeled ADDRESS-PROGRAMMED INPUT and these switches
can be read bv the program as input port position hex
FP or octal 377.
are provided above these switches to assist in inter
preting the switch positions when being used as an input
port.
The position of these switches does not appear in
the indicators until the input instruction from position
FF is executed, during which execution time the switch
positions appear on the data bus as it is being read
into the 8080 processor.
The six control switches are grouped at the right end
of the panel.
return switches with the exception of the POWER ON/OFF
switch, which is a rocker type to eliminate accidental
powerdowns.
The function switches are provided in
alternating colors for easy identification and to
reduce operator error.
The RUN/STOP switch controls program execution.
the switch is pushed to the RUN position, a control
signal is sent to the processor board and enables it
to start or continue executing program instruction
beginning in- the location indicated at that time in
the address bus lights.
depressed to the STOP position, this enable signal is
removed from the processor board at the beginning of
the next instruction cycle so that the processor will
stop executing during the fetch cycle for that follow
ing instruction.
When the processor is enabled to BUN, the RUN light
above the RUN/STOP switch will be lit.
processor has been stopped, the WAIT light to the right
of the RUN light will be lit.
the RUN light will be on full and the WAIT light will
be on partially, the exact amount depending on how
many wait cycles are required by the memory and peripheral
devices being run by the processor at the moment.
4
24
The additional labels 0 through 7
They are center-off two-position spring-
When the address switch is
CP-A
User Guide
Revision 1
When the
During normal operation,
At that
When
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