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

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Jan 10, 2025
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include program and show state image
jameshughes89 committed Dec 18, 2024

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commit 2b7a076c80f571cff44f36a8418cda9e9e3b90b6
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green and green aren't very distinguishable imo

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@jameshughes89 jameshughes89 Jan 10, 2025

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I agree. Currently a limitation of the system. Someone made an issue related to this.

hneemann/Digital#1308

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77 changes: 77 additions & 0 deletions site/topics/output/output-register.rst
Original file line number Diff line number Diff line change
@@ -20,6 +20,83 @@ Including Output in the System
Example of Outputting from the System
=====================================

following same as before adding two numbers
keep it simple though

Load data straight to registers
output addition


load to ram
put into regs
get addition
output addition to output

The below table is the program

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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