diff --git a/source2/Cosmos.Deploy.Pixie/TFTP/TrivialFTP.cs b/source2/Cosmos.Deploy.Pixie/TFTP/TrivialFTP.cs
index b7c741606..7a8428713 100644
--- a/source2/Cosmos.Deploy.Pixie/TFTP/TrivialFTP.cs
+++ b/source2/Cosmos.Deploy.Pixie/TFTP/TrivialFTP.cs
@@ -39,7 +39,6 @@ namespace Cosmos.Deploy.Pixie {
       }
     }
     protected bool Connect() {
-      OpType xOp;
       var xReader = Receive(OpType.Read);
       mDataEP = new IPEndPoint(mRecvEP.Address, mRecvEP.Port);
 
diff --git a/source2/Debug/Cosmos.Debug.VSDebugEngine/AD7.Impl/AD7PendingBreakpoint.cs b/source2/Debug/Cosmos.Debug.VSDebugEngine/AD7.Impl/AD7PendingBreakpoint.cs
index 3d9bb0a1d..db1ce13f9 100644
--- a/source2/Debug/Cosmos.Debug.VSDebugEngine/AD7.Impl/AD7PendingBreakpoint.cs
+++ b/source2/Debug/Cosmos.Debug.VSDebugEngine/AD7.Impl/AD7PendingBreakpoint.cs
@@ -151,7 +151,7 @@ namespace Cosmos.Debug.VSDebugEngine {
                       //}
                   }
               }
-              catch(InvalidOperationException ex)
+              catch(InvalidOperationException)
               { 
                   //No elements in potXMethods sequence!
                   return VSConstants.S_FALSE;
diff --git a/source2/Debug/Cosmos.Debug.VSDebugEngine/Engine.Impl/EngineCallback.cs b/source2/Debug/Cosmos.Debug.VSDebugEngine/Engine.Impl/EngineCallback.cs
index 6e1ab5da0..438d4b6d5 100644
--- a/source2/Debug/Cosmos.Debug.VSDebugEngine/Engine.Impl/EngineCallback.cs
+++ b/source2/Debug/Cosmos.Debug.VSDebugEngine/Engine.Impl/EngineCallback.cs
@@ -63,11 +63,11 @@ namespace Cosmos.Debug.VSDebugEngine {
     // Call this one for internal Cosmos dev.
     // Can be turned off and should be turned off by default. Use an IFDEF or something.
     public void OnOutputString(string outputString) {
-      if (false) {
+#if DEV
         //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);
         var eventObject = new AD7OutputDebugStringEvent(outputString);
         Send(eventObject, AD7OutputDebugStringEvent.IID, null);
-      }
+#endif
     }
 
     // This is the user version, messages directly from Cosmos user code
diff --git a/source2/Kernel/System/Cosmos.System/Filesystem/FAT/Listing/FatFile.cs b/source2/Kernel/System/Cosmos.System/Filesystem/FAT/Listing/FatFile.cs
index a93243b96..c26d236d3 100644
--- a/source2/Kernel/System/Cosmos.System/Filesystem/FAT/Listing/FatFile.cs
+++ b/source2/Kernel/System/Cosmos.System/Filesystem/FAT/Listing/FatFile.cs
@@ -5,7 +5,7 @@ using System.Text;
 
 namespace Cosmos.System.Filesystem.FAT.Listing {
   public class FatFile : Cosmos.System.Filesystem.Listing.File {
-    public readonly FatFileSystem FileSystem;
+    public new readonly FatFileSystem FileSystem;
     public readonly UInt64 FirstClusterNum;
 
     // Size is UInt32 because FAT doesn't support bigger.
diff --git a/source2/Kernel/System/Hardware/Core/Cosmos.Core/Heap.cs b/source2/Kernel/System/Hardware/Core/Cosmos.Core/Heap.cs
index b01f3dedc..bc28e89fe 100644
--- a/source2/Kernel/System/Hardware/Core/Cosmos.Core/Heap.cs
+++ b/source2/Kernel/System/Hardware/Core/Cosmos.Core/Heap.cs
@@ -219,7 +219,7 @@ namespace Cosmos.Core
             }
         }
 
-        private static bool mDebugDisplayInitialized = false;
+        //private static bool mDebugDisplayInitialized = false;
 
         // this method displays the used/total memory of the heap on the first line of the text screen
         private static void UpdateDebugDisplay()
diff --git a/source2/Kernel/System/Hardware/Core/Cosmos.Core/INTs.cs b/source2/Kernel/System/Hardware/Core/Cosmos.Core/INTs.cs
index 280a8f19f..e85bc7ff0 100644
--- a/source2/Kernel/System/Hardware/Core/Cosmos.Core/INTs.cs
+++ b/source2/Kernel/System/Hardware/Core/Cosmos.Core/INTs.cs
@@ -477,7 +477,6 @@ namespace Cosmos.Core
           // At this point we are in a very unstable state.
           // Try not to use any Cosmos routines, just
           // report a crash dump.
-            const string SysFault = " *** System Fault ***  ";
             const string xHex = "0123456789ABCDEF";
             uint xPtr = ctx.EIP;
 
diff --git a/source2/Kernel/System/Hardware/Cosmos.Hardware/Drivers/VGAScreen.cs b/source2/Kernel/System/Hardware/Cosmos.Hardware/Drivers/VGAScreen.cs
index 3e5d6d3be..eecd1cbf7 100644
--- a/source2/Kernel/System/Hardware/Cosmos.Hardware/Drivers/VGAScreen.cs
+++ b/source2/Kernel/System/Hardware/Cosmos.Hardware/Drivers/VGAScreen.cs
@@ -308,7 +308,6 @@ namespace Cosmos.Hardware
                     break;
                 default:
                     throw new Exception("Unknown screen size");
-                    break;
             }
         }
         //public void SetPixel320x200x4(uint x, uint y, uint c);
@@ -332,11 +331,11 @@ namespace Cosmos.Hardware
 
             if ((x & 1) == 0)
             {
-                xSegment[xOffset] = (byte)((xSegment[xOffset] & 0xf) | (c << 4));
+                xSegment[xOffset] = (byte)((xSegment[xOffset] & 0xf) | (byte)(c << 4));
             }
             else
             {
-                xSegment[xOffset] = (byte)((xSegment[xOffset] & 0xf0) | c);
+                xSegment[xOffset] = (byte)((xSegment[xOffset] & 0xf0) | (byte)c);
             }
         }
         public uint GetPixel640x480x4(uint x, uint y)