diff --git a/src/org/hwo/bitfields/Field.java b/src/org/hwo/bitfields/Field.java
index 4995796..0760410 100644
--- a/src/org/hwo/bitfields/Field.java
+++ b/src/org/hwo/bitfields/Field.java
@@ -36,11 +36,19 @@ public class Field {
 	
 	public synchronized int getValue(int srcValue)
 	{
-		return (srcValue >> start) & (-1 >> (Integer.SIZE - len));
+		int mask = (-1 >>> (Integer.SIZE - len));
+		int val = (srcValue >> start) & mask;
+		//System.err.println(String.format("BF: 0x%08x (%d:%d = 0x%08x) = 0x%08x",srcValue,start,len,mask,val));
+		return val;
 	}
 
-	public void setValue(int value)
+	public int setValue(int srcValue,int fieldValue)
 	{
+		int mask = ((-1 >>> (Integer.SIZE - len))<<start);
+		int value = srcValue & ~mask;
+		value |= (fieldValue << start) & mask;
+		System.err.println(String.format("BF: 0x%08x (%d:%d = 0x%08x) = 0x%08x",srcValue,start,len,mask,value));
+		return value;
 	}
 	
 	public int	getStart()
diff --git a/src/org/hwo/bitfields/ui/BitFieldEditor.java b/src/org/hwo/bitfields/ui/BitFieldEditor.java
index 723cb7d..0245e33 100644
--- a/src/org/hwo/bitfields/ui/BitFieldEditor.java
+++ b/src/org/hwo/bitfields/ui/BitFieldEditor.java
@@ -11,8 +11,6 @@ import org.hwo.bitfields.BitField;
 import org.hwo.bitfields.Field;
 
 public class BitFieldEditor extends JPanel {
-	
-	private Integer		intValue;
 	private BitField	bitField;
 	
 	private FieldControl[]	controls;
@@ -22,11 +20,20 @@ public class BitFieldEditor extends JPanel {
 	}
 
 	public Integer getIntValue() {
-		return intValue;
+		int value = 0;
+		for (FieldControl fc:controls)
+		{
+			value = fc.getValue(value);
+		}
+		return value;
 	}
 
 	public void setIntValue(Integer intValue) {
-		this.intValue = intValue;
+		for (FieldControl fc:controls)
+		{
+			fc.setValue(intValue);
+		}
+		
 	}
 
 	public BitField getBitField() {
@@ -67,7 +74,7 @@ public class BitFieldEditor extends JPanel {
 	public boolean requestFocusInWindow() {
 		if ((controls != null) && controls.length != 0)
 		{
-			return controls[0].getEditorComponent().requestFocusInWindow();
+			return controls[0].requestFocusInWindow();
 		}
 		return false;
 	}
diff --git a/src/org/hwo/bitfields/ui/BoolFieldEditor.java b/src/org/hwo/bitfields/ui/BoolFieldEditor.java
index ebc165a..0835c19 100644
--- a/src/org/hwo/bitfields/ui/BoolFieldEditor.java
+++ b/src/org/hwo/bitfields/ui/BoolFieldEditor.java
@@ -23,12 +23,12 @@ public class BoolFieldEditor extends FieldControl {
 
 	@Override
 	void setValue(Integer intValue) {
-		checkbox.setSelected(intValue != 0);
+		checkbox.setSelected(field.getValue(intValue) != 0);
 	}
 
 	@Override
-	Integer getValue() {
-		return checkbox.isSelected() ? 1 : 0;
+	Integer getValue(Integer srcValue) {
+		return field.setValue(srcValue,checkbox.isSelected() ? 1 : 0);
 	}
 
 	public Field getField() {
@@ -41,4 +41,9 @@ public class BoolFieldEditor extends FieldControl {
 		checkbox.setText(field.getLabel());
 	}
 
+	@Override
+	boolean requestFocusInWindow() {
+		return checkbox.requestFocusInWindow();
+	}
+
 }
diff --git a/src/org/hwo/bitfields/ui/FieldControl.java b/src/org/hwo/bitfields/ui/FieldControl.java
index c0fa9fb..f0f751a 100644
--- a/src/org/hwo/bitfields/ui/FieldControl.java
+++ b/src/org/hwo/bitfields/ui/FieldControl.java
@@ -7,7 +7,8 @@ public abstract class FieldControl {
 	
 	abstract JComponent	getEditorComponent();
 	abstract void setValue(Integer intValue);
-	abstract Integer getValue();
+	abstract Integer getValue(Integer srcValue);
 	
+	abstract boolean requestFocusInWindow();
 	
 }
diff --git a/src/org/hwo/bitfields/ui/IntFieldEditor.java b/src/org/hwo/bitfields/ui/IntFieldEditor.java
index 5b20383..d3b705f 100644
--- a/src/org/hwo/bitfields/ui/IntFieldEditor.java
+++ b/src/org/hwo/bitfields/ui/IntFieldEditor.java
@@ -1,10 +1,14 @@
 package org.hwo.bitfields.ui;
 
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
+
 import javax.swing.BoxLayout;
 import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JSpinner;
+import javax.swing.JTextField;
 import javax.swing.SpinnerNumberModel;
 
 import org.hwo.bitfields.Field;
@@ -13,20 +17,33 @@ public class IntFieldEditor extends FieldControl {
 	
 	JPanel		editorPanel;
 	JLabel		label;
-	JSpinner	spinner;
+	JTextField	editor;
+	
+	Field	field;
 	
 	public IntFieldEditor(Field field)
 	{
+		this.field = field;
 		editorPanel = new JPanel();
 		editorPanel.setLayout(new BoxLayout(editorPanel, BoxLayout.X_AXIS));
 		
 		label = new JLabel();
 		label.setText(field.getLabel());
 		
-		spinner = new JSpinner(new SpinnerNumberModel(0, 0, Integer.MAX_VALUE, 1));
+		editor = new JTextField();
+		editor.addFocusListener(new FocusListener() {
+			@Override
+			public void focusLost(FocusEvent e) {
+			}
+			
+			@Override
+			public void focusGained(FocusEvent e) {
+				editor.selectAll();
+			}
+		});
 		
 		editorPanel.add(label);
-		editorPanel.add(spinner);
+		editorPanel.add(editor);
 	}
 	
 	@Override
@@ -36,12 +53,17 @@ public class IntFieldEditor extends FieldControl {
 
 	@Override
 	void setValue(Integer intValue) {
-		spinner.setValue(intValue);
+		editor.setText(Integer.toString(field.getValue(intValue)));
 	}
 
 	@Override
-	Integer getValue() {
-		return (Integer)spinner.getValue();
+	Integer getValue(Integer srcValue) {
+		return field.setValue(srcValue, Integer.decode(editor.getText()));
+	};
+	
+	@Override
+	boolean requestFocusInWindow() {
+		return editor.requestFocusInWindow();
 	}
 
 }
diff --git a/src/org/hwo/io/servicelink/register/BitFieldServiceRegister.java b/src/org/hwo/io/servicelink/register/BitFieldServiceRegister.java
index 1140a1b..984512b 100644
--- a/src/org/hwo/io/servicelink/register/BitFieldServiceRegister.java
+++ b/src/org/hwo/io/servicelink/register/BitFieldServiceRegister.java
@@ -46,11 +46,12 @@ public class BitFieldServiceRegister extends ServiceRegister {
 
 	@Override
 	public void acceptEditorValue() {
+		writeIntegerValue( editor.getIntValue() );
 	}
 
 	@Override
 	public void updateEditorValue() {
-		
+		editor.setIntValue( readIntegerValue() );
 	}
 
 }
diff --git a/src/org/hwo/io/servicelink/register/bitfield/BitFieldEditor.java b/src/org/hwo/io/servicelink/register/bitfield/BitFieldEditor.java
index 26e9526..68d2702 100644
--- a/src/org/hwo/io/servicelink/register/bitfield/BitFieldEditor.java
+++ b/src/org/hwo/io/servicelink/register/bitfield/BitFieldEditor.java
@@ -10,8 +10,6 @@ import javax.swing.JCheckBox;
 import javax.swing.JPanel;
 
 import org.hwo.io.servicelink.ServiceLink;
-import org.hwo.io.servicelink.ServiceLink.ServiceNode;
-import org.hwo.io.servicelink.ServiceLink.ServiceNode.ServiceNodeRegister;
 import org.hwo.io.servicelink.register.ServiceRegister;
 import org.hwo.io.servicelink.register.ServiceRegisterControl;