diff --git a/Visual Studio Projects/AltairZ80.vcxproj b/Visual Studio Projects/AltairZ80.vcxproj
index 7b807595..fb0de222 100755
--- a/Visual Studio Projects/AltairZ80.vcxproj	
+++ b/Visual Studio Projects/AltairZ80.vcxproj	
@@ -87,12 +87,12 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <PreBuildEvent>
       <Message>Check for required build dependencies &amp; git commit id</Message>
-      <Command>Pre-Build-Event.cmd "$(TargetDir)$(TargetName).exe" LIBPCRE</Command>
+      <Command>Pre-Build-Event.cmd "$(TargetDir)$(TargetName).exe" LIBPCRE LIBSDL</Command>
     </PreBuildEvent>
     <ClCompile>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>../AltairZ80/;./;../;../slirp;../slirp_glue;../slirp_glue/qemu;../slirp_glue/qemu/win32/include;../../windows-build/include;../../windows-build/include/SDL2;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>inline=__inline;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>inline=__inline;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC;USE_SIM_VIDEO;HAVE_LIBSDL;HAVE_LIBPNG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessKeepComments>false</PreprocessKeepComments>
       <BasicRuntimeChecks>Default</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@@ -122,12 +122,12 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">
     <PreBuildEvent>
       <Message>Check for required build dependencies &amp; git commit id</Message>
-      <Command>Pre-Build-Event.cmd "$(TargetDir)$(TargetName).exe" LIBPCRE</Command>
+      <Command>Pre-Build-Event.cmd "$(TargetDir)$(TargetName).exe" LIBPCRE LIBSDL</Command>
     </PreBuildEvent>
     <ClCompile>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>../AltairZ80/;./;../;../slirp;../slirp_glue;../slirp_glue/qemu;../slirp_glue/qemu/win32/include;../../windows-build/include;../../windows-build/include/SDL2;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>inline=__inline;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>inline=__inline;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC;USE_SIM_VIDEO;HAVE_LIBSDL;HAVE_LIBPNG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessKeepComments>false</PreprocessKeepComments>
       <BasicRuntimeChecks>Default</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@@ -287,6 +287,8 @@
     <ClCompile Include="..\AltairZ80\s100_ss1.c" />
     <ClCompile Include="..\AltairZ80\s100_tarbell.c" />
     <ClCompile Include="..\AltairZ80\s100_tdd.c" />
+    <ClCompile Include="..\AltairZ80\s100_vdm1.c" />
+    <ClCompile Include="..\AltairZ80\sol20.c" />
     <ClCompile Include="..\AltairZ80\vfdhd.c" />
     <ClCompile Include="..\AltairZ80\wd179x.c" />
     <ClCompile Include="..\scp.c" />
diff --git a/Visual Studio Projects/AltairZ80.vcxproj.filters b/Visual Studio Projects/AltairZ80.vcxproj.filters
index e55a8c89..a10506ad 100755
--- a/Visual Studio Projects/AltairZ80.vcxproj.filters	
+++ b/Visual Studio Projects/AltairZ80.vcxproj.filters	
@@ -207,6 +207,12 @@
     <ClCompile Include="..\AltairZ80\wd179x.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\AltairZ80\s100_vdm1.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\AltairZ80\sol20.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\AltairZ80\altairz80_defs.h">