From f96332b0913a8a365db73a1af3443c0e225a23d8 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Thu, 29 Dec 2011 00:17:13 +0000
Subject: Development check-in.

---
 Noddybox.Emulation.EightBit/Binary.cs              | 63 ++++++++++++++++++++++
 Noddybox.Emulation.EightBit/ICpu.cs                |  5 +-
 Noddybox.Emulation.EightBit/IDevice.cs             |  5 +-
 Noddybox.Emulation.EightBit/IMemory.cs             | 16 +++---
 Noddybox.Emulation.EightBit/IRegister16.cs         |  5 +-
 .../Noddybox.Emulation.EightBit.csproj             |  1 +
 Noddybox.Emulation.EightBit/Register16BigEndian.cs |  5 +-
 Noddybox.Emulation.EightBit/Register16Factory.cs   |  5 +-
 .../Register16LittleEndian.cs                      |  5 +-
 9 files changed, 98 insertions(+), 12 deletions(-)
 create mode 100644 Noddybox.Emulation.EightBit/Binary.cs

(limited to 'Noddybox.Emulation.EightBit')

diff --git a/Noddybox.Emulation.EightBit/Binary.cs b/Noddybox.Emulation.EightBit/Binary.cs
new file mode 100644
index 0000000..0b1928b
--- /dev/null
+++ b/Noddybox.Emulation.EightBit/Binary.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+
+namespace Noddybox.Emulation.EightBit
+{
+    /// <summary>
+    /// Provides helpers for shifting smaller values around without casts all over the shop.
+    /// </summary>
+    public static class Binary
+    {
+        /// <summary>
+        /// Shift 8-bits to the left.
+        /// </summary>
+        /// <param name="b">The byte.</param>
+        /// <param name="shift">How many bits to shift.</param>
+        /// <returns>The shifted value.</returns>
+        public static byte ShiftLeft(byte b, int shift)
+        {
+            return (byte)((b << shift) & 0xff);
+        }
+
+        /// <summary>
+        /// Shift 8-bits to the right.
+        /// </summary>
+        /// <param name="b">The byte.</param>
+        /// <param name="shift">How many bits to shift.</param>
+        /// <returns>The shifted value.</returns>
+        public static byte ShiftRight(byte b, int shift)
+        {
+            return (byte)((b >> shift) & 0xff);
+        }
+
+        /// <summary>
+        /// Shift 16-bits to the left.
+        /// </summary>
+        /// <param name="w">The word.</param>
+        /// <param name="shift">How many bits to shift.</param>
+        /// <returns>The shifted value.</returns>
+        public static ushort ShiftLeft(ushort w, int shift)
+        {
+            return (ushort)((w << shift) & 0xffff);
+        }
+
+        /// <summary>
+        /// Shift 16-bits to the right.
+        /// </summary>
+        /// <param name="w">The word.</param>
+        /// <param name="shift">How many bits to shift.</param>
+        /// <returns>The shifted value.</returns>
+        public static ushort ShiftRight(ushort w, int shift)
+        {
+            return (ushort)((w >> shift) & 0xffff);
+        }
+    }
+}
diff --git a/Noddybox.Emulation.EightBit/ICpu.cs b/Noddybox.Emulation.EightBit/ICpu.cs
index 139933d..dc2f811 100644
--- a/Noddybox.Emulation.EightBit/ICpu.cs
+++ b/Noddybox.Emulation.EightBit/ICpu.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/Noddybox.Emulation.EightBit/IDevice.cs b/Noddybox.Emulation.EightBit/IDevice.cs
index 00ef38d..b8d234a 100644
--- a/Noddybox.Emulation.EightBit/IDevice.cs
+++ b/Noddybox.Emulation.EightBit/IDevice.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/Noddybox.Emulation.EightBit/IMemory.cs b/Noddybox.Emulation.EightBit/IMemory.cs
index 2c842a5..ee41500 100644
--- a/Noddybox.Emulation.EightBit/IMemory.cs
+++ b/Noddybox.Emulation.EightBit/IMemory.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
@@ -12,7 +15,8 @@ using System.Windows.Shapes;
 namespace Noddybox.Emulation.EightBit
 {
     /// <summary>
-    /// Defines an interface for memory.
+    /// Defines an interface for memory.  Note that ints are used rather than smaller unsigned types due to the pain of
+    /// doing boolean operations on anything else in C# without copious casting.
     /// </summary>
     public interface IMemory
     {
@@ -20,14 +24,14 @@ namespace Noddybox.Emulation.EightBit
         /// Reads a byte at a given address.
         /// </summary>
         /// <param name="address">The address to read.</param>
-        /// <returns>The value at that address.</returns>
-        byte Read(ushort address); 
+        /// <returns>The value at that address in the lower 8-bits.</returns>
+        int Read(int address); 
 
         /// <summary>
         /// Writes a byte at a given address.
         /// </summary>
         /// <param name="address">The address to write to.</param>
-        /// <param name="value">The value to write.</param>
-        void Write(ushort address, byte value);
+        /// <param name="value">The value to write.  Only the lower 8-bits are taken.</param>
+        void Write(int address, int value);
     }
 }
diff --git a/Noddybox.Emulation.EightBit/IRegister16.cs b/Noddybox.Emulation.EightBit/IRegister16.cs
index e3bfc69..4356756 100644
--- a/Noddybox.Emulation.EightBit/IRegister16.cs
+++ b/Noddybox.Emulation.EightBit/IRegister16.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj b/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj
index c7d5924..801adae 100644
--- a/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj
+++ b/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj
@@ -49,6 +49,7 @@
     <Reference Include="mscorlib.extensions" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Binary.cs" />
     <Compile Include="ICpu.cs" />
     <Compile Include="IDevice.cs" />
     <Compile Include="IMemory.cs" />
diff --git a/Noddybox.Emulation.EightBit/Register16BigEndian.cs b/Noddybox.Emulation.EightBit/Register16BigEndian.cs
index 8378543..e7a3780 100644
--- a/Noddybox.Emulation.EightBit/Register16BigEndian.cs
+++ b/Noddybox.Emulation.EightBit/Register16BigEndian.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/Noddybox.Emulation.EightBit/Register16Factory.cs b/Noddybox.Emulation.EightBit/Register16Factory.cs
index fd31fe4..249e668 100644
--- a/Noddybox.Emulation.EightBit/Register16Factory.cs
+++ b/Noddybox.Emulation.EightBit/Register16Factory.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/Noddybox.Emulation.EightBit/Register16LittleEndian.cs b/Noddybox.Emulation.EightBit/Register16LittleEndian.cs
index a2cf8a8..ccecdaf 100644
--- a/Noddybox.Emulation.EightBit/Register16LittleEndian.cs
+++ b/Noddybox.Emulation.EightBit/Register16LittleEndian.cs
@@ -1,4 +1,7 @@
-using System;
+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
 using System.Net;
 using System.Windows;
 using System.Windows.Controls;
-- 
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