diff --git a/examples/chapter12_04a/chapter12_04a.sln b/examples/chapter12_04a/chapter12_04a.sln
index 186cc9fbc..6dcb76862 100644
--- a/examples/chapter12_04a/chapter12_04a.sln
+++ b/examples/chapter12_04a/chapter12_04a.sln
@@ -11,21 +11,17 @@ Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
 		Release|x64 = Release|x64
-		target bl602_sifive_e24_riscv|x64 = target bl602_sifive_e24_riscv|x64
 		target stm32f100|x64 = target stm32f100|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.Debug|x64.ActiveCfg = target bl602_sifive_e24_riscv|x64
-		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.Release|x64.ActiveCfg = target bl602_sifive_e24_riscv|x64
-		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.target bl602_sifive_e24_riscv|x64.ActiveCfg = target bl602_sifive_e24_riscv|x64
-		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.target bl602_sifive_e24_riscv|x64.Build.0 = target bl602_sifive_e24_riscv|x64
+		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.Debug|x64.ActiveCfg = target stm32f100|x64
+		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.Release|x64.ActiveCfg = target stm32f100|x64
 		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.target stm32f100|x64.ActiveCfg = target stm32f100|x64
 		{30CE370B-40F3-4BCD-8986-64AAFF8971BD}.target stm32f100|x64.Build.0 = target stm32f100|x64
 		{C8B59726-9319-45C3-8F11-F9F388FB6A2C}.Debug|x64.ActiveCfg = Debug|x64
 		{C8B59726-9319-45C3-8F11-F9F388FB6A2C}.Debug|x64.Build.0 = Debug|x64
 		{C8B59726-9319-45C3-8F11-F9F388FB6A2C}.Release|x64.ActiveCfg = Release|x64
 		{C8B59726-9319-45C3-8F11-F9F388FB6A2C}.Release|x64.Build.0 = Release|x64
-		{C8B59726-9319-45C3-8F11-F9F388FB6A2C}.target bl602_sifive_e24_riscv|x64.ActiveCfg = Release|x64
 		{C8B59726-9319-45C3-8F11-F9F388FB6A2C}.target stm32f100|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
diff --git a/examples/chapter12_04a/readme.md b/examples/chapter12_04a/readme.md
index f65fc1b61..288390737 100644
--- a/examples/chapter12_04a/readme.md
+++ b/examples/chapter12_04a/readme.md
@@ -1,4 +1,4 @@
-# Example Chapter12_04a (variation 32-bit controller)
+# Example Chapter12_04a (variation 32-bit microcontroller)
 ## Benchmarking Floating-Point Calculations
 
 Example chapter12_04a performs a variety of floating-point
@@ -14,9 +14,10 @@ is used.
 
 ## Hardware Setup
 
-In this particular example, we have simply used a commercially-available
-the open-platform STM32F100 Value Line Discovery Kit placed on a breadboard
-with soldered-on pins.
+In this particular example, we have simply used
+the commercially-available, open-platform
+[STM32F100 Value Line Discovery Kit](https://www.st.com/en/evaluation-tools/stm32vldiscovery.html)
+placed on a breadboard with soldered-on pins.
 
 The wiring is straightforward. The blinking LED uses the blue colored
 user LED controlled by pin `portc.8`. The benchmark toggle pin is `portb.9`.
diff --git a/examples/chapter12_04a/target.vcxproj b/examples/chapter12_04a/target.vcxproj
index eb29f5690..0b847e190 100644
--- a/examples/chapter12_04a/target.vcxproj
+++ b/examples/chapter12_04a/target.vcxproj
@@ -1,14 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="target bl602_sifive_e24_riscv|Win32">
-      <Configuration>target bl602_sifive_e24_riscv</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="target bl602_sifive_e24_riscv|x64">
-      <Configuration>target bl602_sifive_e24_riscv</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
     <ProjectConfiguration Include="target stm32f100|Win32">
       <Configuration>target stm32f100</Configuration>
       <Platform>Win32</Platform>
@@ -25,21 +17,11 @@
     <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|Win32'" Label="Configuration">
-    <ConfigurationType>Makefile</ConfigurationType>
-    <CharacterSet>Unicode</CharacterSet>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target stm32f100|Win32'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
     <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|x64'" Label="Configuration">
-    <ConfigurationType>Makefile</ConfigurationType>
-    <CharacterSet>Unicode</CharacterSet>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target stm32f100|x64'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
@@ -53,18 +35,10 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Target|x64'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|Win32'" Label="Configuration">
-    <ConfigurationType>Makefile</ConfigurationType>
-    <PlatformToolset>v141</PlatformToolset>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target stm32f100|Win32'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|x64'" Label="Configuration">
-    <ConfigurationType>Makefile</ConfigurationType>
-    <PlatformToolset>v143</PlatformToolset>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='target stm32f100|x64'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <PlatformToolset>v143</PlatformToolset>
@@ -80,60 +54,34 @@
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   <ImportGroup Label="ExtensionSettings">
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   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='target stm32f100|x64'" Label="PropertySheets">
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     <NMakeIncludeSearchPath Condition="'$(Configuration)|$(Platform)'=='target stm32f100|Win32'">$(ProjectDir)/Cpp; $(ProjectDir)/Cpp/Hal/AVR;$(NMakeIncludeSearchPath)</NMakeIncludeSearchPath>
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     <NMakeAssemblySearchPath Condition="'$(Configuration)|$(Platform)'=='target stm32f100|Win32'">$(NMakeAssemblySearchPath)</NMakeAssemblySearchPath>
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     <NMakeAssemblySearchPath Condition="'$(Configuration)|$(Platform)'=='target stm32f100|x64'">$(NMakeAssemblySearchPath)</NMakeAssemblySearchPath>
-    <NMakeForcedUsingAssemblies Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|Win32'">$(NMakeForcedUsingAssemblies)</NMakeForcedUsingAssemblies>
     <NMakeForcedUsingAssemblies Condition="'$(Configuration)|$(Platform)'=='target stm32f100|Win32'">$(NMakeForcedUsingAssemblies)</NMakeForcedUsingAssemblies>
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@@ -151,33 +99,19 @@
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     <NMakeBuildCommandLine Condition="'$(Configuration)|$(Platform)'=='target stm32f100|Win32'">Target\Build\Build.bat avr</NMakeBuildCommandLine>
-    <NMakeBuildCommandLine Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|x64'">Target\Build\Build.bat bl602_sifive_e24_riscv</NMakeBuildCommandLine>
     <NMakeBuildCommandLine Condition="'$(Configuration)|$(Platform)'=='target stm32f100|x64'">Target\Build\Build.bat stm32f100</NMakeBuildCommandLine>
-    <NMakeReBuildCommandLine Condition="'$(Configuration)|$(Platform)'=='target bl602_sifive_e24_riscv|Win32'">Target\Build\Build.bat avr rebuild</NMakeReBuildCommandLine>
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@@ -195,29 +129,17 @@
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diff --git a/examples/chapter12_04a/target/micros/stm32f100/make/stm32f100_flags.gmk b/examples/chapter12_04a/target/micros/stm32f100/make/stm32f100_flags.gmk
index 38db32969..d44e6bf28 100644
--- a/examples/chapter12_04a/target/micros/stm32f100/make/stm32f100_flags.gmk
+++ b/examples/chapter12_04a/target/micros/stm32f100/make/stm32f100_flags.gmk
@@ -24,7 +24,7 @@ TGT_ALLFLAGS  = -O2                                            \
                 -mno-unaligned-access                          \
                 -mno-long-calls
 
-TGT_CFLAGS    = -std=c99                                       \
+TGT_CFLAGS    = -std=c11                                       \
                 -Wunsuffixed-float-constants                   \
                 $(TGT_ALLFLAGS)
 
diff --git a/examples/readme.md b/examples/readme.md
index c9cfae6b2..9eef5b1b3 100644
--- a/examples/readme.md
+++ b/examples/readme.md
@@ -104,7 +104,7 @@ This example makes straightforward use of preemptive multitasking scheduling wit
 Example ![chapter12_04](https://github.com/ckormanyos/real-time-cpp/tree/master/examples/chapter12_04) Benchmarking Floating-Point Calculations.\
 This example performs a variety of floating-point calculations of selected special functions of pure and applied mathematics.
 
-Example ![chapter12_04a](https://github.com/ckormanyos/real-time-cpp/tree/master/examples/chapter12_04a) Benchmarking Floating-Point Calculations (32-bit variation).\
+Example ![chapter12_04a](https://github.com/ckormanyos/real-time-cpp/tree/master/examples/chapter12_04a) Benchmarking Floating-Point Calculations (variation 32-bit microcontroller).\
 The same special functions and arguments are used as in Example Chapter12_04. In variation 12_04a, however,
 the open-platform STM32F100 Value Line Discovery Kit placed on a breadboard is used.