diff --git a/Computer_Architecture/Hardware_simulation.md b/Computer_Architecture/Hardware_simulation.md
index 0bf4794..257662d 100644
--- a/Computer_Architecture/Hardware_simulation.md
+++ b/Computer_Architecture/Hardware_simulation.md
@@ -9,10 +9,12 @@ tags: [HDL, nand-to-tetris]
 
 In order to test our [HDL](/Computer_Architecture/Hardware_Description_Language.md) files we load them into the hardware simulator program shown below:
 
-<img src="/home/thomas/repos/computer_science/_img/hardware-simulator.png" width="500">
-
 There are several simulation options:
 
 - interactive
 - script-based (where we load a test script into the simulator along with the HDL file
 - comparative (running the HDL program against our intended output specified in the `.out` file)
+
+The image below shows a basic interactive usage of the simulator. We have uploaded the `Xor.hdl` file into the simulator and changed the input pins to `a=1, b=0` and clicked the calculator icon. This then shows the output and internal pin values for these inputs.
+
+<img src="/home/thomas/repos/computer_science/_img/hardware-sim-basic.png" >
diff --git a/_img/hardware-sim-basic.png b/_img/hardware-sim-basic.png
new file mode 100644
index 0000000..52a0049
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