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🎓 Topic output --- Show an example program #133

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74 changes: 74 additions & 0 deletions site/topics/output/output-register.rst
Original file line number Diff line number Diff line change
@@ -66,6 +66,80 @@ Including Output in the System
Example of Outputting from the System
=====================================

* Like previous examples, the numbers 15 and 4 will be added together, but this time the result will be output
* A simpler version of the program will be implemented here

* Load 15 into A
* Load 4 into B
* Output the sum to the output register


* The below table shows the control logic configuration to execute this program

* The address register and RAM in/out are excluded for space


.. list-table:: Add 15 and 4, and output the result
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image

:widths: auto
:align: center
:header-rows: 1

* - :math:`A`
- :math:`B`
- :math:`ALU_{o}`
- :math:`sub`
- :math:`out_{i}`
- :math:`sign`
-
- :math:`D`
-
- :math:`C`
* - ``1/0``
- ``0/0``
- ``0``
- ``0``
- ``0``
- ``0``
-
- ``0x0F``
-
- ``C``
* - ``0/0``
- ``1/0``
- ``0``
- ``0``
- ``0``
- ``0``
-
- ``0x04``
-
- ``C``
* - ``0/0``
- ``0/0``
- ``1``
- ``0``
- ``1``
- ``0``
-
- ``Z``
-
- ``C``


* The below image shows the state of the system after adding 15 and 4 together and outputting the result
* Due to the output register, the computer could continue to operate while still outputting this value
* In other words, the control signals could change, along with the data on the bus, and the output would remain

* Unless new data was put into the output register


.. figure:: esap_alu_ram_output_displaying_19.png
:width: 500 px
:align: center

ESAP system outputting 19 on the seven segment displays. This would be the final state of the system after executing
the program described in the above table.



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