diff --git a/options.txt b/options.txt
index 10f7de6..551eaf2 100644
--- a/options.txt
+++ b/options.txt
@@ -132,9 +132,13 @@ GraphIEC = 1
 //
 //    Please see dmRotary.h for full implementation details.
 //
+//    Updated to address issue #185 and allow for inversion of rotary operation
+//    for certain encoders. - 08/13/2020 by Geo...
+//
 //RotaryEncoderEnable = 1
+//RotaryEncoderInvert = 1
 
 // This option will display the temperature of the Pi's CPU.
-// It should be about 52°C anything above 65°C is bad and there is something wrong with your hardware
+// It should be about 52�C anything above 65�C is bad and there is something wrong with your hardware
 //DisplayTemperature = 1
 
diff --git a/src/iec_bus.cpp b/src/iec_bus.cpp
index c9caca9..1640d91 100644
--- a/src/iec_bus.cpp
+++ b/src/iec_bus.cpp
@@ -74,7 +74,8 @@ unsigned IEC_Bus::gplev0;
 //ROTARY: Added for rotary encoder support - 09/05/2019 by Geo...
 RotaryEncoder IEC_Bus::rotaryEncoder;
 bool IEC_Bus::rotaryEncoderEnable;
-
+//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+bool IEC_Bus::rotaryEncoderInvert;
 
 void IEC_Bus::ReadGPIOUserInput( int buttonCount)
 {
diff --git a/src/iec_bus.h b/src/iec_bus.h
index 278d649..5449d72 100644
--- a/src/iec_bus.h
+++ b/src/iec_bus.h
@@ -375,7 +375,15 @@ public:
 		//ROTARY: Added for rotary encoder support - 09/05/2019 by Geo...
 		if (IEC_Bus::rotaryEncoderEnable == true)
 		{
-			IEC_Bus::rotaryEncoder.Initialize(RPI_GPIO22, RPI_GPIO23, RPI_GPIO27);
+			//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+			if (IEC_Bus::rotaryEncoderInvert == true)
+			{
+				IEC_Bus::rotaryEncoder.Initialize(RPI_GPIO23, RPI_GPIO22, RPI_GPIO27);
+			}
+			else
+			{
+				IEC_Bus::rotaryEncoder.Initialize(RPI_GPIO22, RPI_GPIO23, RPI_GPIO27);
+			}
 		}
 
 	}
@@ -670,6 +678,12 @@ public:
 		rotaryEncoderEnable = value;
 	}
 
+	//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+	static inline void SetRotaryEncoderInvert(bool value)
+	{
+		rotaryEncoderInvert = value;
+	}
+
 	// CA1 input ATN
 	// If CA1 is ever set to output
 	//	- CA1 will start to drive pb7
@@ -737,6 +751,8 @@ private:
 	//ROTARY: Added for rotary encoder support - 09/05/2019 by Geo...
 	static RotaryEncoder rotaryEncoder;
 	static bool rotaryEncoderEnable;
+	//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+	static bool rotaryEncoderInvert;
 
 };
 #endif
diff --git a/src/main.cpp b/src/main.cpp
index 77dcfac..c8e32f4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1940,6 +1940,8 @@ extern "C"
 		IEC_Bus::SetIgnoreReset(options.IgnoreReset());
 		//ROTARY: Added for rotary encoder support - 09/05/2019 by Geo...
 		IEC_Bus::SetRotaryEncoderEnable(options.RotaryEncoderEnable());
+		//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+		IEC_Bus::SetRotaryEncoderInvert(options.RotaryEncoderInvert());
 #if not defined(EXPERIMENTALZERO)
 		if (!options.SoundOnGPIO())
 		{
diff --git a/src/options.cpp b/src/options.cpp
index 4d409d9..2774263 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -159,7 +159,7 @@ Options::Options(void)
         , buttonBack(4)
         , buttonInsert(5)
 	, rotaryEncoderEnable(0) //ROTARY:
-
+	, rotaryEncoderInvert(0) //ROTARY:
 {
 	autoMountImageName[0] = 0;
 	strcpy(ROMFontName, "chargen");
@@ -251,6 +251,7 @@ void Options::Process(char* buffer)
 		ELSE_CHECK_DECIMAL_OPTION(buttonBack)
 		ELSE_CHECK_DECIMAL_OPTION(buttonInsert)
 		ELSE_CHECK_DECIMAL_OPTION(rotaryEncoderEnable) //ROTARY:
+		ELSE_CHECK_DECIMAL_OPTION(rotaryEncoderInvert) //ROTARY:
 		else if ((strcasecmp(pOption, "AutoBaseName") == 0))
 		{
 			strncpy(autoBaseName, pValue, 255);
diff --git a/src/options.h b/src/options.h
index 374dda0..889e4b9 100644
--- a/src/options.h
+++ b/src/options.h
@@ -109,6 +109,8 @@ public:
 
 	//ROTARY: Added for rotary encoder support - 09/05/2019 by Geo...
 	inline unsigned int RotaryEncoderEnable() const { return rotaryEncoderEnable; }
+	//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+	inline unsigned int RotaryEncoderInvert() const { return rotaryEncoderInvert; }
 
 	// Page up and down will jump a different amount based on the maximum number rows displayed.
 	// Perhaps we should use some keyboard modifier to the the other screen?
@@ -191,6 +193,8 @@ private:
 
 	//ROTARY: Added for rotary encoder support - 09/05/2019 by Geo...
 	unsigned int rotaryEncoderEnable;
+	//ROTARY: Added for rotary encoder inversion (Issue#185) - 08/13/2020 by Geo...
+	unsigned int rotaryEncoderInvert;
 
 };
 #endif