From 7235d3a3bb4dd727f981eb0266685ecbc181f4e2 Mon Sep 17 00:00:00 2001
From: Luigi Thirty <luigi30@gmail.com>
Date: Fri, 4 Dec 2015 22:10:31 -0500
Subject: [PATCH] started adding settings window for ROM paths cycle counts
 accurate when crossing page boundaries lots of other improvements

---
 6502EmulatorFrontend/6502EmulatorFrontend.sln |  11 +-
 .../6502EmulatorFrontend.csproj               |  36 ++++
 .../6502EmulatorFrontend/Interop.cs           |  20 +--
 .../6502EmulatorFrontend/MainWindow.xaml      | 109 ++++++------
 .../6502EmulatorFrontend/MainWindow.xaml.cs   |  65 +++-----
 .../6502EmulatorFrontend/MainWindowEvents.cs  |  79 +++++++++
 .../6502EmulatorFrontend/SettingsWindow.xaml  |  28 ++++
 .../SettingsWindow.xaml.cs                    |  39 +++++
 .../SettingsWindowViewModel.cs                |  53 ++++++
 M6502EmulatorDll/M6502EmulatorDll/CPU.cpp     |  48 +++---
 M6502EmulatorDll/M6502EmulatorDll/CPU.h       |  39 +++--
 .../M6502EmulatorDll/addressing.cpp           |   6 +
 M6502EmulatorDll/M6502EmulatorDll/opcodes.cpp | 157 +++++++++++++-----
 13 files changed, 495 insertions(+), 195 deletions(-)
 create mode 100644 6502EmulatorFrontend/6502EmulatorFrontend/MainWindowEvents.cs
 create mode 100644 6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml
 create mode 100644 6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml.cs
 create mode 100644 6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindowViewModel.cs

diff --git a/6502EmulatorFrontend/6502EmulatorFrontend.sln b/6502EmulatorFrontend/6502EmulatorFrontend.sln
index 1e8e8fb..c482352 100644
--- a/6502EmulatorFrontend/6502EmulatorFrontend.sln
+++ b/6502EmulatorFrontend/6502EmulatorFrontend.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 14
-VisualStudioVersion = 14.0.24627.0
+VisualStudioVersion = 14.0.24720.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "6502EmulatorFrontend", "6502EmulatorFrontend\6502EmulatorFrontend.csproj", "{C198497A-3D3E-4F01-A72B-642DAB6B11D6}"
 EndProject
@@ -24,13 +24,4 @@ Global
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
-	GlobalSection(TeamFoundationVersionControl) = preSolution
-		SccNumberOfProjects = 2
-		SccEnterpriseProvider = {4CA58AB2-18FA-4F8D-95D4-32DDF27D184C}
-		SccTeamFoundationServer = https://luigithirty.visualstudio.com/defaultcollection
-		SccLocalPath0 = .
-		SccProjectUniqueName1 = 6502EmulatorFrontend\\6502EmulatorFrontend.csproj
-		SccProjectName1 = 6502EmulatorFrontend
-		SccLocalPath1 = 6502EmulatorFrontend
-	EndGlobalSection
 EndGlobal
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/6502EmulatorFrontend.csproj b/6502EmulatorFrontend/6502EmulatorFrontend/6502EmulatorFrontend.csproj
index 8f2563e..ea0706a 100644
--- a/6502EmulatorFrontend/6502EmulatorFrontend/6502EmulatorFrontend.csproj
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/6502EmulatorFrontend.csproj
@@ -18,6 +18,21 @@
     <SccLocalPath>SAK</SccLocalPath>
     <SccAuxPath>SAK</SccAuxPath>
     <SccProvider>SAK</SccProvider>
+    <PublishUrl>publish\</PublishUrl>
+    <Install>true</Install>
+    <InstallFrom>Disk</InstallFrom>
+    <UpdateEnabled>false</UpdateEnabled>
+    <UpdateMode>Foreground</UpdateMode>
+    <UpdateInterval>7</UpdateInterval>
+    <UpdateIntervalUnits>Days</UpdateIntervalUnits>
+    <UpdatePeriodically>false</UpdatePeriodically>
+    <UpdateRequired>false</UpdateRequired>
+    <MapFileExtensions>true</MapFileExtensions>
+    <ApplicationRevision>0</ApplicationRevision>
+    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <IsWebBootstrapper>false</IsWebBootstrapper>
+    <UseApplicationTrust>false</UseApplicationTrust>
+    <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -65,7 +80,12 @@
     <Compile Include="Apple2Display.cs" />
     <Compile Include="cpu\Disassembly.cs" />
     <Compile Include="IDisplay.cs" />
+    <Compile Include="MainWindowEvents.cs" />
     <Compile Include="MainWindowViewModel.cs" />
+    <Compile Include="SettingsWindow.xaml.cs">
+      <DependentUpon>SettingsWindow.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="SettingsWindowViewModel.cs" />
     <Compile Include="video\CharacterBitmap.cs" />
     <Compile Include="video\CharacterSet.cs" />
     <Page Include="MainWindow.xaml">
@@ -84,6 +104,10 @@
       <DependentUpon>MainWindow.xaml</DependentUpon>
       <SubType>Code</SubType>
     </Compile>
+    <Page Include="SettingsWindow.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs">
@@ -115,6 +139,18 @@
   <ItemGroup>
     <Folder Include="memory\" />
   </ItemGroup>
+  <ItemGroup>
+    <BootstrapperPackage Include=".NETFramework,Version=v4.6">
+      <Visible>False</Visible>
+      <ProductName>Microsoft .NET Framework 4.6 %28x86 and x64%29</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1</ProductName>
+      <Install>false</Install>
+    </BootstrapperPackage>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/Interop.cs b/6502EmulatorFrontend/6502EmulatorFrontend/Interop.cs
index 2b211e5..a8fef42 100644
--- a/6502EmulatorFrontend/6502EmulatorFrontend/Interop.cs
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/Interop.cs
@@ -42,35 +42,35 @@ namespace _6502EmulatorFrontend
             public byte DSPCR;
         };
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern bool loadBinary([MarshalAs(UnmanagedType.LPStr)] string path, ushort address);
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern ushort getProgramCounter();
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern InteropProcessorStatus getProcessorStatus();
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern void resetProcessor();
 
         //Execution
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern void doSingleStep();
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern MC6821Status getMC6821Status();
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern byte getOutputBuffer();
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern IntPtr getMemoryRange(ushort baseAddr, ushort length);
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern void resetCycleCounter();
 
-        [DllImport("C:/Users/Luigi/Documents/Visual Studio 2015/Projects/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
+        [DllImport("C:/apple/fruitmachine/M6502EmulatorDll/Debug/M6502EmulatorDll.dll", CallingConvention = CallingConvention.Cdecl)]
         public static extern void putKeyInBuffer(byte key);
     }
 }
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml b/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml
index 902af10..c5b129d 100644
--- a/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml
@@ -5,55 +5,64 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:_6502EmulatorFrontend"
         mc:Ignorable="d"
-        Title="Fruit Machine 0.0000001a" Height="600" Width="954">
-    <Grid>
-        <Button x:Name="btnLoadBinary" Content="Load Binary" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="75" Click="btnLoadBinary_Click"/>
-        <Label x:Name="binaryLoadedStatus" Content="Label" HorizontalAlignment="Left" Margin="90,8,0,0" VerticalAlignment="Top" Width="417"/>
-        <Grid HorizontalAlignment="Left" Height="185" Margin="10,39,0,0" VerticalAlignment="Top" Width="200" Background="#FFACACAC">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="3*"/>
-                <ColumnDefinition Width="5*"/>
-            </Grid.ColumnDefinitions>
-            <StackPanel Orientation="Vertical" Grid.ColumnSpan="1">
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <Label Content="PC" Height="25"></Label>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <Label Content="A" Height="25"></Label>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <Label Content="X" Height="25"></Label>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <Label Content="Y" Height="25"></Label>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <Label Content="SP" Height="25"></Label>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <Label Content="Flags" Height="25"></Label>
-            </StackPanel>
-            <StackPanel Orientation="Vertical" Grid.ColumnSpan="1" Grid.Column="1">
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <TextBox Name="txtProgramCounter" Height="25" Text="{Binding Path=Processor.ProgramCounter, StringFormat={}{0:X4}}" HorizontalAlignment="Right" Width="115" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <TextBox Name="txtAccumulator" Height="25" Text="{Binding Path=Processor.Accumulator, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <TextBox Name="txtIndexX" Height="25" Text="{Binding Path=Processor.IndexX, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <TextBox Name="txtIndexY" Height="25" Text="{Binding Path=Processor.IndexY, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <TextBox Name="txtStackPointer" Height="25" Text="{Binding Path=Processor.StackPointer, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
-                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
-                <TextBox Name="txtFlags" Height="25" Text="{Binding Path=Processor.Flags}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
-            </StackPanel>
-        </Grid>
-        <Button x:Name="btnSingleStep" Content="Single Step" HorizontalAlignment="Left" Margin="10,229,0,0" VerticalAlignment="Top" Width="75" Click="btnSingleStep_Click" IsEnabled="False"/>
-        <Image x:Name="image" Source="{Binding Path=DisplayGrid.DisplayCanvas}" HorizontalAlignment="Left" Height="384" Margin="215,39,0,0" VerticalAlignment="Top" Width="640" RenderOptions.BitmapScalingMode="NearestNeighbor"/>
-        <Button x:Name="btnRun" Content="Run" HorizontalAlignment="Left" Margin="135,229,0,0" VerticalAlignment="Top" Width="75" Click="btnRun_Click" IsEnabled="False"/>
-        <ListBox x:Name="lbDisassembly" ItemsSource="{Binding DisassembledOpcodes}" HorizontalAlignment="Left" Height="277" Margin="10,283,0,0" VerticalAlignment="Top" Width="200" FontFamily="Courier New">
-            <ListBox.Resources>
-                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}">LightBlue</SolidColorBrush>
-            </ListBox.Resources>
-        </ListBox>
-        <TextBox ScrollViewer.VerticalScrollBarVisibility="Visible" x:Name="tbDebugConsole" HorizontalAlignment="Left" Height="104" Margin="215,428,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="721"/>
-        <Button x:Name="btnBreak" Content="Break" HorizontalAlignment="Left" Margin="135,256,0,0" VerticalAlignment="Top" Width="75" Click="btnBreak_Click"/>
-        <TextBox x:Name="tbDebugEntry" HorizontalAlignment="Left" Height="23" Margin="215,537,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="721" KeyDown="tbDebugEntry_KeyDown"/>
+        Title="Fruit Machine 0.0000001a" Height="700" Width="954">
+    <DockPanel>
+        <Menu DockPanel.Dock="Top">
+            <MenuItem Header="_File"/>
+            <MenuItem Header="_Settings">
+                <MenuItem Header="_ROM Paths" Click="MenuItem_Click"/>
+            </MenuItem>
+            
+        </Menu>
+        <Grid>
+            <Button x:Name="btnLoadBinary" Content="Load Binary" HorizontalAlignment="Left" Margin="10,0,0,0" VerticalAlignment="Top" Width="75" Click="btnLoadBinary_Click"/>
+            <Label x:Name="binaryLoadedStatus" Content="Label" HorizontalAlignment="Left" Margin="90,108,0,0" VerticalAlignment="Top" Width="417"/>
+            <Grid HorizontalAlignment="Left" Height="185" Margin="10,27,0,0" VerticalAlignment="Top" Width="200" Background="#FFACACAC">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="3*"/>
+                    <ColumnDefinition Width="5*"/>
+                </Grid.ColumnDefinitions>
+                <StackPanel Orientation="Vertical" Grid.ColumnSpan="1">
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <Label Content="PC" Height="25"></Label>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <Label Content="A" Height="25"></Label>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <Label Content="X" Height="25"></Label>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <Label Content="Y" Height="25"></Label>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <Label Content="SP" Height="25"></Label>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <Label Content="Flags" Height="25"></Label>
+                </StackPanel>
+                <StackPanel Orientation="Vertical" Grid.ColumnSpan="1" Grid.Column="1">
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <TextBox Name="txtProgramCounter" Height="25" Text="{Binding Path=Processor.ProgramCounter, StringFormat={}{0:X4}}" HorizontalAlignment="Right" Width="115" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <TextBox Name="txtAccumulator" Height="25" Text="{Binding Path=Processor.Accumulator, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <TextBox Name="txtIndexX" Height="25" Text="{Binding Path=Processor.IndexX, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <TextBox Name="txtIndexY" Height="25" Text="{Binding Path=Processor.IndexY, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <TextBox Name="txtStackPointer" Height="25" Text="{Binding Path=Processor.StackPointer, StringFormat={}{0:X2}}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
+                    <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" />
+                    <TextBox Name="txtFlags" Height="25" Text="{Binding Path=Processor.Flags}" Margin="0,0,10,0" FontFamily="Courier New" FontWeight="Bold" FontSize="13.333"></TextBox>
+                </StackPanel>
+            </Grid>
+            <Button x:Name="btnSingleStep" Content="Single Step" HorizontalAlignment="Left" Margin="10,217,0,0" VerticalAlignment="Top" Width="75" Click="btnSingleStep_Click" IsEnabled="False"/>
+            <Image x:Name="image" Source="{Binding Path=DisplayGrid.DisplayCanvas}" HorizontalAlignment="Left" Height="384" Margin="215,0,0,0" VerticalAlignment="Top" Width="640" RenderOptions.BitmapScalingMode="NearestNeighbor"/>
+            <Button x:Name="btnRun" Content="Run" HorizontalAlignment="Left" Margin="135,217,0,0" VerticalAlignment="Top" Width="75" Click="btnRun_Click" IsEnabled="False"/>
+            <ListBox x:Name="lbDisassembly" ItemsSource="{Binding DisassembledOpcodes}" HorizontalAlignment="Left" Height="277" Margin="10,271,0,0" VerticalAlignment="Top" Width="200" FontFamily="Courier New">
+                <ListBox.Resources>
+                    <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}">LightBlue</SolidColorBrush>
+                </ListBox.Resources>
+            </ListBox>
+            <TextBox ScrollViewer.VerticalScrollBarVisibility="Visible" x:Name="tbDebugConsole" HorizontalAlignment="Left" Height="159" Margin="215,389,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="721"/>
+            <Button x:Name="btnBreak" Content="Break" HorizontalAlignment="Left" Margin="135,244,0,0" VerticalAlignment="Top" Width="75" Click="btnBreak_Click"/>
+            <TextBox x:Name="tbDebugEntry" HorizontalAlignment="Left" Height="23" Margin="215,637,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="721" KeyDown="tbDebugEntry_KeyDown"/>
 
-    </Grid>
+        </Grid>
+    </DockPanel>
 </Window>
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml.cs b/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml.cs
index 74edf73..f3a5dbd 100644
--- a/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml.cs
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/MainWindow.xaml.cs
@@ -29,6 +29,9 @@ namespace _6502EmulatorFrontend
         Thread M6502WorkerThread;
         MainWindowViewModel vm = new MainWindowViewModel();
         byte[] videoRom = File.ReadAllBytes("C:/apple/apple1.vid");
+        string monitorRomPath;
+        string basicRomPath;
+        SettingsWindow settingsWindow;
 
         public MainWindow()
         {
@@ -55,21 +58,24 @@ namespace _6502EmulatorFrontend
             vm.Processor.ExecutionStopped += new M6502.ExecutionStoppedEventHandler(onExecutionStopped);
             TextCompositionManager.AddTextInputHandler(this, new TextCompositionEventHandler(OnTextComposition));
 
+            //Set up settings window
+            settingsWindow = new SettingsWindow();
+            settingsWindow.RomPathsSaved += new SettingsWindow.RomPathsSavedEventHandler(OnRomPathsSaved);
+            settingsWindow.swvm.BasicRomPath = @"C:\apple\apple1basic.bin";
+            settingsWindow.swvm.MonitorRomPath = @"C:\apple\apple1.rom";
+            basicRomPath = @"C:\apple\apple1basic.bin";
+            monitorRomPath = @"C:\apple\apple1.rom";
+
             //Set up window
             InitializeComponent();
             binaryLoadedStatus.SetBinding(ContentProperty, new Binding("LoadSuccess"));
             DataContext = vm;
         }
 
-        private void OnTextComposition(object sender, TextCompositionEventArgs e)
-        {
-            Interop.putKeyInBuffer((byte)e.Text.ToUpper().ToCharArray()[0]);
-        }
-
         private void btnLoadBinary_Click(object sender, RoutedEventArgs e)
         {
-            Interop.loadBinary("C:/apple/apple1.rom", 0xFF00);
-            Interop.loadBinary("C:/apple/apple1basic.bin", 0xE000);
+            Interop.loadBinary(monitorRomPath, 0xFF00);
+            Interop.loadBinary(basicRomPath, 0xE000);
             decodeGraphics();
 
             Interop.resetProcessor();
@@ -94,16 +100,6 @@ namespace _6502EmulatorFrontend
 
         }
 
-        private void AfterProcessorStepCompleted(M6502 sender, EventArgs e)
-        {
-            UpdateDisassemblySelection(sender.ProgramCounter);
-        }
-
-        private void btnSingleStep_Click(object sender, RoutedEventArgs e)
-        {
-            vm.Processor.DoProcessorStep(null, null);
-        }
-
         private void decodeGraphics()
         {
             for(int i=0; i < (videoRom.Length / 8); i++)
@@ -134,35 +130,7 @@ namespace _6502EmulatorFrontend
             BindingOperations.SetBinding(lbDisassembly, ListBox.ItemsSourceProperty, new Binding("DisassembledOpcodes"));
         }
 
-        private void onExecutionStopped(object sender, EventArgs e)
-        {
-            Dispatcher.Invoke(new Action(() => { vm.DisassembledOpcodes.Clear(); }));
-
-            ushort length = 0xFFFE;
-            IntPtr memoryValuesPtr = Interop.getMemoryRange(0x0000, length);
-            byte[] result = new byte[length + 1];
-            Marshal.Copy(memoryValuesPtr, result, 0, length);
-
-            Disassembly disassembly = new Disassembly(result);
-            disassembly.Begin((ushort)(vm.Processor.ProgramCounter - 0x100));
-
-            while (disassembly.NextInstructionAddress < (ushort)vm.Processor.ProgramCounter + 0x100)
-            {
-                Dispatcher.Invoke(new Action(() =>
-                {
-                    vm.DisassembledOpcodes.Add(disassembly.ToDisassembledOpcode());
-                }));
-                disassembly.Next();
-            }
-
-            Dispatcher.Invoke(new Action(() =>
-            {
-                UpdateDisassemblySelection(vm.Processor.ProgramCounter);
-            }));
-
-            lbDisassembly.Dispatcher.Invoke(new Action(() => { enableReadoutControls(); }));
-            lbDisassembly.Dispatcher.Invoke(new Action(() => { tbDebugConsole.Text += "Breakpoint hit.\r\n"; }));
-        }
+        
 
         private void UpdateDisassemblySelection(ushort address)
         {
@@ -224,5 +192,10 @@ namespace _6502EmulatorFrontend
                 tbDebugEntry.Clear();
             }
         }
+
+        private void MenuItem_Click(object sender, RoutedEventArgs e)
+        {
+            settingsWindow.ShowDialog();
+        }
     }
 }
\ No newline at end of file
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/MainWindowEvents.cs b/6502EmulatorFrontend/6502EmulatorFrontend/MainWindowEvents.cs
new file mode 100644
index 0000000..a9f50d2
--- /dev/null
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/MainWindowEvents.cs
@@ -0,0 +1,79 @@
+using _6502EmulatorFrontend.cpu;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Input;
+
+namespace _6502EmulatorFrontend
+{
+    partial class MainWindow
+    {
+        public class RomPathEventArgs : EventArgs
+        {
+            public readonly string MonitorPath;
+            public readonly string BasicPath;
+
+            public RomPathEventArgs(string monitorPath, string basicPath)
+            {
+                MonitorPath = monitorPath;
+                BasicPath = basicPath;
+            }
+        }
+
+        private void OnRomPathsSaved(object sender, RomPathEventArgs e)
+        {
+            monitorRomPath = e.MonitorPath;
+            basicRomPath = e.BasicPath;
+        }
+
+        private void OnTextComposition(object sender, TextCompositionEventArgs e)
+        {
+            Interop.putKeyInBuffer((byte)e.Text.ToUpper().ToCharArray()[0]);
+        }
+
+        private void AfterProcessorStepCompleted(M6502 sender, EventArgs e)
+        {
+            UpdateDisassemblySelection(sender.ProgramCounter);
+        }
+
+        private void btnSingleStep_Click(object sender, RoutedEventArgs e)
+        {
+            vm.Processor.DoProcessorStep(null, null);
+        }
+
+        //
+        private void onExecutionStopped(object sender, EventArgs e)
+        {
+            Dispatcher.Invoke(new Action(() => { vm.DisassembledOpcodes.Clear(); }));
+
+            ushort length = 0xFFFE;
+            IntPtr memoryValuesPtr = Interop.getMemoryRange(0x0000, length);
+            byte[] result = new byte[length + 1];
+            Marshal.Copy(memoryValuesPtr, result, 0, length);
+
+            Disassembly disassembly = new Disassembly(result);
+            disassembly.Begin((ushort)(vm.Processor.ProgramCounter - 0x100));
+
+            while (disassembly.NextInstructionAddress < (ushort)vm.Processor.ProgramCounter + 0x100)
+            {
+                Dispatcher.Invoke(new Action(() =>
+                {
+                    vm.DisassembledOpcodes.Add(disassembly.ToDisassembledOpcode());
+                }));
+                disassembly.Next();
+            }
+
+            Dispatcher.Invoke(new Action(() =>
+            {
+                UpdateDisassemblySelection(vm.Processor.ProgramCounter);
+            }));
+
+            lbDisassembly.Dispatcher.Invoke(new Action(() => { enableReadoutControls(); }));
+            lbDisassembly.Dispatcher.Invoke(new Action(() => { tbDebugConsole.Text += "Breakpoint hit.\r\n"; }));
+        }
+    }
+}
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml b/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml
new file mode 100644
index 0000000..276018f
--- /dev/null
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml
@@ -0,0 +1,28 @@
+<Window x:Class="_6502EmulatorFrontend.SettingsWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:_6502EmulatorFrontend"
+        mc:Ignorable="d"
+        Title="SettingsWindow" Height="300" Width="525.627">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="22*"/>
+            <RowDefinition Height="93*"/>
+            <RowDefinition Height="20*"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="150"/>
+            <ColumnDefinition Width="65*"/>
+            <ColumnDefinition Width="27*"/>
+        </Grid.ColumnDefinitions>
+        <Label Grid.Column="0" x:Name="label" Content="Monitor ROM ($FF00)" HorizontalAlignment="Left" Margin="10,8,0,0" VerticalAlignment="Top" Width="130" Height="26"/>
+        <Label Grid.Column="0" x:Name="label1" Content="Basic ROM ($E000)" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="130" Grid.Row="1" Height="26"/>
+        <TextBox Grid.Column="1" Grid.Row="0" x:Name="tbMonitorRomPath" HorizontalAlignment="Left" Height="23" Margin="10,12,0,0" TextWrapping="Wrap" Text="{Binding Path=MonitorRomPath}" VerticalAlignment="Top" Width="240"/>
+        <Button x:Name="btnMonitorRom" Content="Browse" Grid.Column="2" HorizontalAlignment="Left" Margin="10,12,0,0" VerticalAlignment="Top" Width="88" Height="22"/>
+        <TextBox Grid.Column="1" Grid.Row="1" x:Name="tbBasicRomPath" HorizontalAlignment="Left" Height="23" Margin="10,12,0,0" TextWrapping="Wrap" Text="{Binding Path=BasicRomPath}" VerticalAlignment="Top" Width="240"/>
+        <Button x:Name="btnBasicRom" Content="Browse" Grid.Column="2" HorizontalAlignment="Left" Margin="10,12,0,0" VerticalAlignment="Top" Width="88" Height="22" Grid.Row="1"/>
+        <Button x:Name="btnSave" Content="Save" Grid.Column="2" HorizontalAlignment="Left" Margin="10,8,0,0" Grid.Row="2" VerticalAlignment="Top" Width="88" Click="btnSave_Click"/>
+    </Grid>
+</Window>
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml.cs b/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml.cs
new file mode 100644
index 0000000..d9ec764
--- /dev/null
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindow.xaml.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace _6502EmulatorFrontend
+{
+    /// <summary>
+    /// Interaction logic for SettingsWindow.xaml
+    /// </summary>
+    public partial class SettingsWindow : Window
+    {
+        public event RomPathsSavedEventHandler RomPathsSaved;
+        public delegate void RomPathsSavedEventHandler(object sender, MainWindow.RomPathEventArgs e);
+
+        public SettingsWindowViewModel swvm;
+
+        public SettingsWindow()
+        {
+            swvm = new SettingsWindowViewModel();
+            InitializeComponent();
+            DataContext = swvm;
+        }
+
+        private void btnSave_Click(object sender, RoutedEventArgs e)
+        {
+            
+        }
+    }
+}
diff --git a/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindowViewModel.cs b/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindowViewModel.cs
new file mode 100644
index 0000000..9be574c
--- /dev/null
+++ b/6502EmulatorFrontend/6502EmulatorFrontend/SettingsWindowViewModel.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _6502EmulatorFrontend
+{
+    public class SettingsWindowViewModel
+    {
+        private string _monitorRomPath;
+        private string _basicRomPath;
+
+        public string MonitorRomPath
+        {
+            get { return _monitorRomPath; }
+            set
+            {
+                if (value != _monitorRomPath)
+                {
+                    _monitorRomPath = value;
+                    OnPropertyChanged("MonitorRomPath");
+                }
+            }
+        }
+
+        public string BasicRomPath
+        {
+            get { return _basicRomPath; }
+            set
+            {
+                if (value != _basicRomPath)
+                {
+                    _basicRomPath = value;
+                    OnPropertyChanged("BasicRomPath");
+                }
+            }
+        }
+
+        #region INotifyPropertyChanged Implementation
+        public event PropertyChangedEventHandler PropertyChanged;
+        protected virtual void OnPropertyChanged(string name)
+        {
+            var handler = System.Threading.Interlocked.CompareExchange(ref PropertyChanged, null, null);
+            if (handler != null)
+            {
+                handler(this, new PropertyChangedEventArgs(name));
+            }
+        }
+        #endregion
+    }
+}
\ No newline at end of file
diff --git a/M6502EmulatorDll/M6502EmulatorDll/CPU.cpp b/M6502EmulatorDll/M6502EmulatorDll/CPU.cpp
index 64e86f4..c30738f 100644
--- a/M6502EmulatorDll/M6502EmulatorDll/CPU.cpp
+++ b/M6502EmulatorDll/M6502EmulatorDll/CPU.cpp
@@ -11,6 +11,8 @@
 */
 
 //The master processor of instructions.
+bool CPU::lastInstructionCrossedPageBoundary = false;
+
 void CPU::process_instruction() {
 	last_executed_opcode = "";
 	last_operand = 0x00;
@@ -198,7 +200,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "ORA (M),Y $";
-			op_ora(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_ora(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -230,7 +232,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "ORA M,Y $";
-			op_ora(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_ora(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -238,7 +240,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "ORA M,X $";
-			op_ora(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_ora(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
@@ -350,7 +352,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "AND (M),Y $";
-			op_and(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_and(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -382,7 +384,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "AND M,Y $";
-			op_and(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_and(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -390,7 +392,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "AND M,X $";
-			op_and(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_and(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 		
@@ -494,7 +496,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "EOR (ZP),Y $";
-			op_eor(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_eor(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -526,7 +528,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "EOR M,Y $";
-			op_eor(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_eor(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -534,7 +536,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "EOR M,X $";
-			op_eor(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_eor(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
@@ -640,7 +642,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "ADC (ZP),Y $";
-			op_adc(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_adc(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -680,7 +682,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "ADC M,Y $";
-			op_adc(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_adc(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -688,7 +690,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "ADC M,X $";
-			op_adc(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_adc(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
@@ -944,7 +946,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "LDA (ZP),Y $";
-			op_lda(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_lda(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -984,7 +986,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "LDA M,Y $";
-			op_lda(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_lda(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -1000,7 +1002,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "LDY M,X $";
-			op_ldy(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_ldy(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
@@ -1008,7 +1010,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "LDA M,X $";
-			op_lda(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_lda(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
@@ -1016,7 +1018,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "LDX M,Y $";
-			op_ldx(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_ldx(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -1120,7 +1122,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "CMP (ZP),Y";
-			op_cmp(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_cmp(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -1152,7 +1154,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "CMP M,Y $";
-			op_cmp(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_cmp(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -1160,7 +1162,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "CMP M,X $";
-			op_cmp(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_cmp(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
@@ -1271,7 +1273,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 5;
 			last_executed_opcode = "SBC (ZP),Y $";
-			op_sbc(fetch_operand_address(ADDRESSING_INDIRECT_Y));
+			op_sbc(fetch_operand_address(ADDRESSING_INDIRECT_Y), true);
 			break;
 		}
 
@@ -1303,7 +1305,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "SBC M,Y $";
-			op_sbc(fetch_operand_address(ADDRESSING_ABSOLUTE_Y));
+			op_sbc(fetch_operand_address(ADDRESSING_ABSOLUTE_Y), true);
 			break;
 		}
 
@@ -1311,7 +1313,7 @@ void CPU::execute_opcode(uint8_t opcode)
 		{
 			cycles += 4;
 			last_executed_opcode = "SBC M,X $";
-			op_sbc(fetch_operand_address(ADDRESSING_ABSOLUTE_X));
+			op_sbc(fetch_operand_address(ADDRESSING_ABSOLUTE_X), true);
 			break;
 		}
 
diff --git a/M6502EmulatorDll/M6502EmulatorDll/CPU.h b/M6502EmulatorDll/M6502EmulatorDll/CPU.h
index 7bdcc42..7ff3baa 100644
--- a/M6502EmulatorDll/M6502EmulatorDll/CPU.h
+++ b/M6502EmulatorDll/M6502EmulatorDll/CPU.h
@@ -38,10 +38,13 @@ public:
 	enum ADDRESSING_MODE { ADDRESSING_IMMEDIATE, ADDRESSING_ABSOLUTE, ADDRESSING_ABSOLUTE_X, ADDRESSING_ABSOLUTE_Y, ADDRESSING_ZEROPAGE, ADDRESSING_ZEROPAGE_X, ADDRESSING_ZEROPAGE_Y, ADDRESSING_INDIRECT, ADDRESSING_INDIRECT_X, ADDRESSING_INDIRECT_Y };
 	enum INDEX_MODE { INDEX_NONE = 0x01, INDEX_X = 0x02, INDEX_Y = 0x03 };
 
+	static bool lastInstructionCrossedPageBoundary;
+
 	bool frameInstructionsComplete();
 	void resetCycleCounter();
 
 	void reset_processor() {
+		lastInstructionCrossedPageBoundary = false;
 		FLAG_SIGN = false;
 		FLAG_OVERFLOW = false;
 		FLAG_BREAKPOINT = false;
@@ -117,13 +120,13 @@ public:
 	void print_status(uint8_t opcode);
 
 	/* Opcodes */
-	void CPU::op_adc(WideAddress address);
+	void CPU::op_adc(WideAddress address, bool crossedPageBoundary = false);
 
-	void CPU::op_adc(uint8_t immediate);
+	void CPU::op_adc(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_and(WideAddress address);
+	void CPU::op_and(WideAddress address, bool crossedPageBoundary = false);
 
-	void CPU::op_and(uint8_t immediate);
+	void CPU::op_and(uint8_t immediate, bool crossedPageBoundary = false);
 
 	void CPU::op_asl(WideAddress address);
 
@@ -157,9 +160,9 @@ public:
 
 	void CPU::op_clv();
 
-	void CPU::op_cmp(uint8_t immediate);
+	void CPU::op_cmp(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_cmp(WideAddress address);
+	void CPU::op_cmp(WideAddress address, bool crossedPageBoundary = false);
 
 	void CPU::op_cpx(uint8_t immediate);
 
@@ -175,9 +178,9 @@ public:
 
 	void CPU::op_dey();
 
-	void CPU::op_eor(uint8_t immediate);
+	void CPU::op_eor(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_eor(WideAddress address);
+	void CPU::op_eor(WideAddress address, bool crossedPageBoundary = false);
 
 	void CPU::op_inc(WideAddress address);
 
@@ -189,17 +192,17 @@ public:
 
 	void CPU::op_jsr(WideAddress address);
 
-	void CPU::op_lda(uint8_t immediate);
+	void CPU::op_lda(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_lda(WideAddress address);
+	void CPU::op_lda(WideAddress address, bool crossedPageBoundary = false);
 
-	void CPU::op_ldx(uint8_t immediate);
+	void CPU::op_ldx(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_ldx(WideAddress address);
+	void CPU::op_ldx(WideAddress address, bool crossedPageBoundary = false);
 
-	void CPU::op_ldy(uint8_t immediate);
+	void CPU::op_ldy(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_ldy(WideAddress address);
+	void CPU::op_ldy(WideAddress address, bool crossedPageBoundary = false);
 
 	void CPU::op_lsr();
 
@@ -207,9 +210,9 @@ public:
 
 	void CPU::op_nop();
 
-	void CPU::op_ora(uint8_t immediate);
+	void CPU::op_ora(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_ora(WideAddress address);
+	void CPU::op_ora(WideAddress address, bool crossedPageBoundary = false);
 
 	void CPU::op_pha();
 
@@ -231,9 +234,9 @@ public:
 
 	void CPU::op_rts();
 
-	void CPU::op_sbc(uint8_t immediate);
+	void CPU::op_sbc(uint8_t immediate, bool crossedPageBoundary = false);
 
-	void CPU::op_sbc(WideAddress address);
+	void CPU::op_sbc(WideAddress address, bool crossedPageBoundary = false);
 
 	void CPU::op_sec();
 
diff --git a/M6502EmulatorDll/M6502EmulatorDll/addressing.cpp b/M6502EmulatorDll/M6502EmulatorDll/addressing.cpp
index 25a74c8..acba908 100644
--- a/M6502EmulatorDll/M6502EmulatorDll/addressing.cpp
+++ b/M6502EmulatorDll/M6502EmulatorDll/addressing.cpp
@@ -4,6 +4,7 @@
 #include <iostream>
 
 uint8_t CPU::fetch_operand(ADDRESSING_MODE mode) {
+	lastInstructionCrossedPageBoundary = false;
 
 	switch (mode) {
 	case ADDRESSING_IMMEDIATE:
@@ -24,6 +25,7 @@ uint8_t CPU::fetch_operand(ADDRESSING_MODE mode) {
 	case ADDRESSING_ZEROPAGE_X:
 	{
 		uint8_t address = fetch_operand(ADDRESSING_IMMEDIATE);
+		lastInstructionCrossedPageBoundary = (address + index_x < address);
 		uint8_t operand = fetch_zero_page_byte(address + index_x);
 		last_operand = address;
 		return operand;
@@ -32,6 +34,7 @@ uint8_t CPU::fetch_operand(ADDRESSING_MODE mode) {
 	case ADDRESSING_ZEROPAGE_Y:
 	{
 		uint8_t address = fetch_operand(ADDRESSING_IMMEDIATE);
+		lastInstructionCrossedPageBoundary = (address + index_y < address);
 		uint8_t operand = fetch_zero_page_byte(address + index_y);
 		last_operand = address;
 		return operand;
@@ -52,6 +55,7 @@ uint8_t CPU::fetch_operand(ADDRESSING_MODE mode) {
 		uint8_t addrLow = fetch_memory_byte(program_counter);
 		uint8_t addrHigh = fetch_memory_byte(program_counter);
 		WideAddress address = { addrHigh, addrLow };
+		lastInstructionCrossedPageBoundary = (addrLow + index_x < addrLow);
 		uint8_t operand = fetch_memory_byte(address.add(index_x, false), false);
 		last_operand = address;
 		return operand;
@@ -62,6 +66,7 @@ uint8_t CPU::fetch_operand(ADDRESSING_MODE mode) {
 		uint8_t addrLow = fetch_memory_byte(program_counter);
 		uint8_t addrHigh = fetch_memory_byte(program_counter);
 		WideAddress address = { addrHigh, addrLow };
+		lastInstructionCrossedPageBoundary = (addrLow + index_y < addrLow);
 		uint8_t operand = fetch_memory_byte(address.add(index_y, false), false);
 		last_operand = address;
 		return operand;
@@ -79,6 +84,7 @@ uint8_t CPU::fetch_operand(ADDRESSING_MODE mode) {
 	case ADDRESSING_INDIRECT_Y:
 	{
 		WideAddress destination = fetch_dereferenced_zero_page_pointer(INDEX_NONE);
+		lastInstructionCrossedPageBoundary = ((destination & 0xFF00) + index_y) > (destination & 0xFF00);
 		destination = destination.add(index_y, false);
 		uint8_t operand = fetch_memory_byte(destination);
 		last_operand = operand;
diff --git a/M6502EmulatorDll/M6502EmulatorDll/opcodes.cpp b/M6502EmulatorDll/M6502EmulatorDll/opcodes.cpp
index 3780c8b..171e464 100644
--- a/M6502EmulatorDll/M6502EmulatorDll/opcodes.cpp
+++ b/M6502EmulatorDll/M6502EmulatorDll/opcodes.cpp
@@ -25,11 +25,16 @@ unsigned char hex2bcd(unsigned char x)
 	If there is no parameter on the function, it's either implied or accumulator.
 	Assume that PC value is correct coming in.
 
-	The exception is when branching because we don't know if we were successful until now
-	so we need to add +1 to PC on a successful branch and another +1 if the branch
-	goes to a different page. */
+	When branching because we don't know if we were successful until now
+	so we need to add +1 to cycles on a successful branch and another +1 if the branch
+	goes to a different page.
+	
+	crossedPageBoundary tells us if we need to increase cycle count by 1 if we crossed the page boundary
+	CPU::lastInstructionCrossedPageBoundary keeps track of if we did or not
+	if both are true, increase cycle count by 1.
+	*/
 
-void CPU::op_adc(WideAddress address) {
+void CPU::op_adc(WideAddress address, bool crossedPageBoundary) {
 	/*
 	Logic:
 	  t = A + M + P.C
@@ -44,6 +49,10 @@ void CPU::op_adc(WideAddress address) {
 	  A = t & 0xFF      
 	*/
 
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	if (accumulator == 0x7f) {
 		int x = 0;
 	}
@@ -64,7 +73,7 @@ void CPU::op_adc(WideAddress address) {
 
 };
 
-void CPU::op_adc(uint8_t immediate) {
+void CPU::op_adc(uint8_t immediate, bool crossedPageBoundary) {
 	/*
 	Logic:
 		t = A + M + P.C
@@ -79,6 +88,10 @@ void CPU::op_adc(uint8_t immediate) {
 		A = t & 0xFF
 	*/
 
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	if (accumulator == 0x7f) {
 		int x = 0;
 	}
@@ -108,23 +121,33 @@ void CPU::op_adc(uint8_t immediate) {
 	accumulator = (t & 0xFF);
 };
 
-void CPU::op_and(WideAddress address) {
+void CPU::op_and(WideAddress address, bool crossedPageBoundary) {
 	/*
 	Logic:
 		A = A & M
 		P.N = A.7
 		P.Z = (A==0) ? 1:0 */
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = (accumulator & fetch_memory_byte(address, false));
 	FLAG_SIGN = (accumulator & 0x80) == 0x80;
 	FLAG_ZERO = (accumulator == 0);
 }
 
-void CPU::op_and(uint8_t immediate) {
+void CPU::op_and(uint8_t immediate, bool crossedPageBoundary) {
 	/*
 	Logic:
 	A = A & M
 	P.N = A.7
 	P.Z = (A==0) ? 1:0 */
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = (accumulator & immediate);
 	FLAG_SIGN = (accumulator & 0x80) == 0x80;
 	FLAG_ZERO = (accumulator == 0);
@@ -162,9 +185,9 @@ void CPU::op_bcc(int8_t relative) {
 	if (!FLAG_CARRY) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
@@ -173,9 +196,9 @@ void CPU::op_bcs(int8_t relative) {
 	if (FLAG_CARRY) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
@@ -184,9 +207,9 @@ void CPU::op_beq(int8_t relative) {
 	if (FLAG_ZERO) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
@@ -210,16 +233,16 @@ void CPU::op_bmi(int8_t relative) {
 	if (PN) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
 
 void CPU::op_bne(int8_t relative) {
 	if (!PZ) {
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 		if (relative == (int8_t)0xFE) {
 			std::exit(4);
@@ -231,9 +254,9 @@ void CPU::op_bpl(int8_t relative) {
 	if (!PN) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
@@ -253,9 +276,9 @@ void CPU::op_bvc(int8_t relative) {
 	if (!PV) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
@@ -264,9 +287,9 @@ void CPU::op_bvs(int8_t relative) {
 	if (PV) {
 		//+1 cycle for branching, +2 if branching to a different page
 		if ((program_counter & 0x00FF) + relative > 0x100) {
-			EmulatorState::Instance()->processor.cycles++;
+			cycles++;
 		}
-		EmulatorState::Instance()->processor.cycles++;
+		cycles++;
 		program_counter += relative;
 	}
 }
@@ -287,7 +310,7 @@ void CPU::op_clv() {
 	PV = false;
 }
 
-void CPU::op_cmp(uint8_t immediate) { //immediate
+void CPU::op_cmp(uint8_t immediate, bool crossedPageBoundary) { //immediate
 	/*
 	Logic:
 		t = A - M
@@ -296,6 +319,10 @@ void CPU::op_cmp(uint8_t immediate) { //immediate
 		P.Z = (t==0) ? 1:0
 	*/
 
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	uint8_t t = accumulator - immediate;
 	PN = (t & 0x80) == 0x80;
 	PC = (accumulator >= immediate);
@@ -303,7 +330,7 @@ void CPU::op_cmp(uint8_t immediate) { //immediate
 
 }
 
-void CPU::op_cmp(WideAddress address) {
+void CPU::op_cmp(WideAddress address, bool crossedPageBoundary) {
 	/*
 	Logic:
 	t = A - M
@@ -312,6 +339,10 @@ void CPU::op_cmp(WideAddress address) {
 	P.Z = (t==0) ? 1:0
 	*/
 
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	uint8_t t = accumulator - fetch_memory_byte(address, false);
 	PN = (t & 0x80) == 0x80;
 	PC = (accumulator >= fetch_memory_byte(address, false));
@@ -372,13 +403,23 @@ void CPU::op_dey() {
 	PN = (index_y & 0x80) == 0x80;
 }
 
-void CPU::op_eor(uint8_t immediate) {
+void CPU::op_eor(uint8_t immediate, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = accumulator ^ immediate;
 	PN = (accumulator & 0x80) == 0x80;
 	PZ = (accumulator == 0);
 }
 
-void CPU::op_eor(WideAddress address) {
+void CPU::op_eor(WideAddress address, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = accumulator ^ fetch_memory_byte(address, false);
 	PN = (accumulator & 0x80) == 0x80;
 	PZ = (accumulator == 0);
@@ -430,37 +471,67 @@ void CPU::op_jsr(WideAddress address) {
 	program_counter = address;
 }
 
-void CPU::op_lda(uint8_t immediate) {
+void CPU::op_lda(uint8_t immediate, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = immediate;
 	PN = (accumulator & 0x80) == 0x80;
 	PZ = (accumulator == 0);
 }
 
-void CPU::op_lda(WideAddress address) {
+void CPU::op_lda(WideAddress address, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = fetch_memory_byte(address, false);
 	PN = (accumulator & 0x80) == 0x80;
 	PZ = (accumulator == 0);
 }
 
-void CPU::op_ldx(uint8_t immediate) {
+void CPU::op_ldx(uint8_t immediate, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	index_x = immediate;
 	PN = (index_x & 0x80) == 0x80;
 	PZ = (index_x == 0);
 }
 
-void CPU::op_ldx(WideAddress address) {
+void CPU::op_ldx(WideAddress address, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	index_x = fetch_memory_byte(address, false);
 	PN = (index_x & 0x80) == 0x80;
 	PZ = (index_x == 0);
 }
 
-void CPU::op_ldy(uint8_t immediate) {
+void CPU::op_ldy(uint8_t immediate, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	index_y = immediate;
 	PN = (index_y & 0x80) == 0x80;
 	PZ = (index_y == 0);
 }
 
-void CPU::op_ldy(WideAddress address) {
+void CPU::op_ldy(WideAddress address, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	index_y = fetch_memory_byte(address, false);
 	PN = (index_y & 0x80) == 0x80;
 	PZ = (index_y == 0);
@@ -498,13 +569,23 @@ void CPU::op_nop() {
 	//NOP
 }
 
-void CPU::op_ora(uint8_t immediate) {
+void CPU::op_ora(uint8_t immediate, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = accumulator | immediate;
 	PN = (accumulator & 0x80) == 0x80;
 	PZ = (accumulator == 0);
 }
 
-void CPU::op_ora(WideAddress address) {
+void CPU::op_ora(WideAddress address, bool crossedPageBoundary) {
+
+	if (crossedPageBoundary && lastInstructionCrossedPageBoundary) {
+		cycles++;
+	}
+
 	accumulator = accumulator | fetch_memory_byte(address, false);
 	PN = (accumulator & 0x80) == 0x80;
 	PZ = (accumulator == 0);
@@ -613,7 +694,7 @@ void CPU::op_rts() {
 	program_counter = addr.add(1, false);
 }
 
-void CPU::op_sbc(uint8_t immediate) {
+void CPU::op_sbc(uint8_t immediate, bool crossedPageBoundary) {
 	/*
 	Logic:
 	  IF (P.D)
@@ -629,7 +710,7 @@ void CPU::op_sbc(uint8_t immediate) {
   */
 	//TODO: decimal
 
-	op_adc(~immediate);
+	op_adc(~immediate, crossedPageBoundary);
 
 	/*
 	int8_t t;
@@ -649,8 +730,8 @@ void CPU::op_sbc(uint8_t immediate) {
 	*/
 }
 
-void CPU::op_sbc(WideAddress address) {
-	op_adc(~fetch_memory_byte(address, false));
+void CPU::op_sbc(WideAddress address, bool crossedPageBoundary) {
+	op_adc(~fetch_memory_byte(address, false), crossedPageBoundary);
 
 	/*
 	int8_t t;