diff --git a/source/Cosmos/Cosmos.Hardware/CPU.cs b/source/Cosmos/Cosmos.Hardware/CPU.cs
index 5d92d0ab8..7377e7d10 100644
--- a/source/Cosmos/Cosmos.Hardware/CPU.cs
+++ b/source/Cosmos/Cosmos.Hardware/CPU.cs
@@ -17,5 +17,8 @@ namespace Cosmos.Hardware {
 				return GetEndOfKernel();
 			}
 		}
+
+		public static void ZeroFill(uint aStartAddress, uint aLength) {
+		}
 	}
 }
\ No newline at end of file
diff --git a/source/Cosmos/Cosmos.Kernel.Plugs/Assemblers/ZeroFill.cs b/source/Cosmos/Cosmos.Kernel.Plugs/Assemblers/ZeroFill.cs
new file mode 100644
index 000000000..c5a75e984
--- /dev/null
+++ b/source/Cosmos/Cosmos.Kernel.Plugs/Assemblers/ZeroFill.cs
@@ -0,0 +1,19 @@
+using System;
+using Indy.IL2CPU.Assembler.X86;
+using Indy.IL2CPU.Plugs;
+using Assembler = Indy.IL2CPU.Assembler.Assembler;
+using CPUx86 = Indy.IL2CPU.Assembler.X86;
+using CPUNative = Indy.IL2CPU.Assembler.X86.Native;
+
+namespace Cosmos.Kernel.Plugs.Assemblers {
+	public class ZeroFill: AssemblerMethod {
+
+		//		public static void ZeroFill(uint aStartAddress, uint aLength) {}
+		public override void Assemble(Assembler aAssembler) {
+			new CPUx86.Move("edi", "[ebp + 0xC]"); // address
+			new CPUx86.Move("ecx", "[ebp + 8]");
+			new CPUx86.Move("eax", "0");
+			new CPUx86.RepeatStos();						
+		}
+	}
+}
diff --git a/source/Cosmos/Cosmos.Kernel.Plugs/CPU.cs b/source/Cosmos/Cosmos.Kernel.Plugs/CPU.cs
index 86c8c40ce..862c86893 100644
--- a/source/Cosmos/Cosmos.Kernel.Plugs/CPU.cs
+++ b/source/Cosmos/Cosmos.Kernel.Plugs/CPU.cs
@@ -7,10 +7,16 @@ using HW = Cosmos.Hardware;
 namespace Cosmos.Kernel.Plugs {
 	[Plug(Target = typeof(HW.CPU))]
 	public static class CPU {
-		[PlugMethod(MethodAssembler=typeof(Assemblers.CreateGDT))]
-		public static void CreateGDT() { }
+		[PlugMethod(MethodAssembler = typeof(Assemblers.CreateGDT))]
+		public static void CreateGDT() {
+		}
 
-        [PlugMethod(MethodAssembler = typeof(Assemblers.CreateIDT))]
-        public static void CreateIDT() { }
+		[PlugMethod(MethodAssembler = typeof(Assemblers.CreateIDT))]
+		public static void CreateIDT() {
+		}
+
+		[PlugMethod(MethodAssembler = typeof(Assemblers.ZeroFill))]
+		public static void ZeroFill(uint aStartAddress, uint aLength) {
+		}
 	}
 }
diff --git a/source/Cosmos/Cosmos.Kernel.Plugs/Cosmos.Kernel.Plugs.csproj b/source/Cosmos/Cosmos.Kernel.Plugs/Cosmos.Kernel.Plugs.csproj
index 795ab4b87..a47149b59 100644
--- a/source/Cosmos/Cosmos.Kernel.Plugs/Cosmos.Kernel.Plugs.csproj
+++ b/source/Cosmos/Cosmos.Kernel.Plugs/Cosmos.Kernel.Plugs.csproj
@@ -57,6 +57,7 @@
     <Compile Include="Assemblers\CreateIDT.cs" />
     <Compile Include="Assemblers\IOReadByte.cs" />
     <Compile Include="Assemblers\IOWriteByte.cs" />
+    <Compile Include="Assemblers\ZeroFill.cs" />
     <Compile Include="Console.cs" />
     <Compile Include="CPU.cs" />
     <Compile Include="Hardware.cs" />
diff --git a/source/Cosmos/Cosmos.Kernel/CPU.cs b/source/Cosmos/Cosmos.Kernel/CPU.cs
index 6a214b656..e146abd32 100644
--- a/source/Cosmos/Cosmos.Kernel/CPU.cs
+++ b/source/Cosmos/Cosmos.Kernel/CPU.cs
@@ -43,6 +43,9 @@ namespace Cosmos.Kernel {
 			Console.Write("Value = ");
 			Hardware.Storage.ATA.WriteNumber(xPointer[1], 32);
 			Console.WriteLine("");
+			xPointer = (uint*)Heap.MemAlloc(64);
+			Hardware.Storage.ATA.WriteNumber((uint)xPointer, 32);
+			Console.WriteLine("");
 			//Console.Write("Initializing Keyboard...");
 			//Keyboard.Initialize();
 			//Console.WriteLine("Done");
diff --git a/source/Cosmos/Cosmos.Kernel/Heap.cs b/source/Cosmos/Cosmos.Kernel/Heap.cs
index 445b86f3b..bfbc7049c 100644
--- a/source/Cosmos/Cosmos.Kernel/Heap.cs
+++ b/source/Cosmos/Cosmos.Kernel/Heap.cs
@@ -24,38 +24,36 @@ namespace Cosmos.Kernel {
 		//private const uint DefaultMaxMemory = 32 * 1024 * 1024;
 
 		private static void ClearMemory(uint aStartAddress, uint aLength) {
+			DebugUtil.SendDoubleNumber("MM", "Clearing memory", aStartAddress, 32, aLength, 32);
 			Console.Write("[MM] Clearing ");
 			Hardware.Storage.ATA.WriteNumber(aLength, 32);
 			Console.Write(" bytes at ");
 			Hardware.Storage.ATA.WriteNumber(aStartAddress, 32);
 			Console.WriteLine("");
+			Hardware.CPU.ZeroFill(aStartAddress, aLength);
+			//uint* xPtrLong = (uint*)aStartAddress;
+			//{
+			//    for (int i = 0; i < (aLength / 4); i++) {
+			//        xPtrLong[i] = 0;
+			//    }
+			//}
+			//byte* xPtr = (byte*)(aStartAddress + aLength - (aLength % 4));
+			//{
+			//    for (int i = 0; i < aLength%4; i++) {
+			//        xPtr[i] = 0;
+			//    }
+			//}
 
-			uint* xPtrLong = (uint*)aStartAddress;
-			{
-				for (int i = 0; i < (aLength / 4); i++) {
-					xPtrLong[i] = 0;
-				}
-			}
-			byte* xPtr = (byte*)(aStartAddress + aLength - (aLength % 4));
-			{
-				for (int i = 0; i < aLength%4; i++) {
-					xPtr[i] = 0;
-				}
-			}
 		}
 
 		private static void Initialize(uint aStartAddress, uint aLength) {
 			mStartAddress = aStartAddress;
-			//			mCurrentAddress = aStartAddress;
 			mLength = aLength;
-			Console.Write("Initializing memory...");
 			ClearMemory(aStartAddress, aLength);
-			Console.WriteLine("Done");
 			mFirstBlock = (MemoryBlock*)aStartAddress;
 			mFirstBlock->State = MemoryBlockState.Free;
 			mFirstBlock->Next = (MemoryBlock*)(aStartAddress + aLength);
 			mFirstBlock->Next->State = MemoryBlockState.EndOfMemory;
-			//DebugUtil.SendMM_Init(aStartAddress, aLength);
 		}
 
 		public static void CheckInit() {
@@ -111,10 +109,12 @@ namespace Cosmos.Kernel {
 
 		[GlueMethod(Type = GlueMethodType.Heap_Free)]
 		public static void MemFree(uint aPointer) {
+			DebugUtil.SendNumber("MM", "Free pointer", aPointer, 32);
 			MemoryBlock* xBlock = (MemoryBlock*)(aPointer - 5);
 			xBlock->State = MemoryBlockState.Free;
-			uint aLength;
-			ClearMemory((uint)xBlock, (((uint)xBlock->Next) - ((uint)xBlock) - 5));
+			uint xLength = ((uint)xBlock->Next) - aPointer;
+			DebugUtil.SendNumber("MM", "Pointer length", xLength, 32);
+			ClearMemory(aPointer, xLength);
 		}
 	}
 }
diff --git a/source/Indy.IL2CPU.Assembler.X86/Indy.IL2CPU.Assembler.X86.csproj b/source/Indy.IL2CPU.Assembler.X86/Indy.IL2CPU.Assembler.X86.csproj
index 72f9671e8..33f7a37cd 100644
--- a/source/Indy.IL2CPU.Assembler.X86/Indy.IL2CPU.Assembler.X86.csproj
+++ b/source/Indy.IL2CPU.Assembler.X86/Indy.IL2CPU.Assembler.X86.csproj
@@ -60,6 +60,7 @@
     <Compile Include="Not.cs" />
     <Compile Include="Pushfd.cs" />
     <Compile Include="Registers.cs" />
+    <Compile Include="RepeatStos.cs" />
     <Compile Include="ShiftLeft.cs" />
     <Compile Include="Divide.cs" />
     <Compile Include="Instruction.cs" />
diff --git a/source/Indy.IL2CPU.Assembler.X86/RepeatStos.cs b/source/Indy.IL2CPU.Assembler.X86/RepeatStos.cs
new file mode 100644
index 000000000..769e3f279
--- /dev/null
+++ b/source/Indy.IL2CPU.Assembler.X86/RepeatStos.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Indy.IL2CPU.Assembler.X86 {
+	[OpCode(0xFFFFFFFF, "rep stosb")]
+	public class RepeatStos: Instruction {
+		//public readonly string Destination;
+		public RepeatStos() {
+			//	Destination = aDestination;
+		}
+		//public override string ToString() {
+		//    return "rep stos " + Destinati;
+		//}
+	}
+}