diff --git a/MC6809/src/MC6809.vcxproj b/MC6809/src/MC6809.vcxproj
index 4cad0f7..2c4c2d2 100644
--- a/MC6809/src/MC6809.vcxproj
+++ b/MC6809/src/MC6809.vcxproj
@@ -108,7 +108,6 @@
       <PreprocessorDefinitions>NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <EnableEnhancedInstructionSet>AdvancedVectorExtensions</EnableEnhancedInstructionSet>
       <BufferSecurityCheck>false</BufferSecurityCheck>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
@@ -152,7 +151,6 @@
       <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <EnableEnhancedInstructionSet>AdvancedVectorExtensions</EnableEnhancedInstructionSet>
       <BufferSecurityCheck>false</BufferSecurityCheck>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
diff --git a/MC6809/test/test_MC6809.vcxproj b/MC6809/test/test_MC6809.vcxproj
index c6cab8f..67808cd 100644
--- a/MC6809/test/test_MC6809.vcxproj
+++ b/MC6809/test/test_MC6809.vcxproj
@@ -89,9 +89,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
@@ -139,9 +137,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
diff --git a/MC6809/unittest/unittest_MC6809.vcxproj b/MC6809/unittest/unittest_MC6809.vcxproj
index 2d8a75e..0214fa8 100644
--- a/MC6809/unittest/unittest_MC6809.vcxproj
+++ b/MC6809/unittest/unittest_MC6809.vcxproj
@@ -89,9 +89,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
@@ -161,9 +159,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
diff --git a/MC6850/src/MC6850.vcxproj b/MC6850/src/MC6850.vcxproj
index 39fc96a..d211b05 100644
--- a/MC6850/src/MC6850.vcxproj
+++ b/MC6850/src/MC6850.vcxproj
@@ -90,9 +90,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
@@ -142,9 +140,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>