diff --git a/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CMemoryBlockExtension.java b/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CMemoryBlockExtension.java
index c4b57acce2f..625344ba2e2 100644
--- a/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CMemoryBlockExtension.java
+++ b/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CMemoryBlockExtension.java
@@ -175,14 +175,19 @@ public class CMemoryBlockExtension extends CDebugElement implements IMemoryBlock
 	 * @see org.eclipse.debug.core.model.IMemoryBlockExtension#setBaseAddress(java.math.BigInteger)
 	 */
 	public void setBaseAddress( BigInteger address ) throws DebugException {
+		BigInteger current = fBaseAddress;
+		if (current == address || (current != null && current.equals(address))) {
+			return;	// optimization
+		}
+		fBaseAddress = address;
+		fireChangeEvent(DebugEvent.STATE);
 	}
 
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IMemoryBlockExtension#getBytesFromOffset(java.math.BigInteger, long)
 	 */
 	public MemoryByte[] getBytesFromOffset( BigInteger unitOffset, long addressableUnits ) throws DebugException {
-		// TODO Auto-generated method stub
-		return null;
+		return getBytesFromAddress(unitOffset.add(getBigBaseAddress()) , addressableUnits);
 	}
 
 	/* (non-Javadoc)
diff --git a/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java b/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java
index 714a8338ac7..a59b64d5ee1 100644
--- a/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java
+++ b/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java
@@ -1110,7 +1110,9 @@ public class Rendering extends Composite implements IDebugEventSetListener
 
             	try
             	{
-                    getMemoryBlock().setValue(address.subtract(fParent.getBigBaseAddress()), byteValue);
+            		IMemoryBlockExtension block = getMemoryBlock();
+                    BigInteger offset = address.subtract(block.getBigBaseAddress());
+                    block.setValue(offset, byteValue);
                 }
                 catch(Exception e)
                 {