diff --git a/sample.xml b/sample.xml
index a64a989d..dc327a8f 100644
--- a/sample.xml
+++ b/sample.xml
@@ -52,6 +52,16 @@
             <slider divisions="5" />
         </hints>
     </int>
+    <int size="2">
+        <name>Immediate-write integer slider</name>
+        <description>Doesn't do anything either</description>
+        <min>0</min>
+        <max>1000</max>
+        <default>12</default>
+        <hints>
+            <slider divisions="5" immediate="yes" />
+        </hints>
+    </int>
 </segment>
 
 <segment origin="128" space="1">
diff --git a/src/org/openlcb/cdi/CdiRep.java b/src/org/openlcb/cdi/CdiRep.java
index 59540475..735658dc 100644
--- a/src/org/openlcb/cdi/CdiRep.java
+++ b/src/org/openlcb/cdi/CdiRep.java
@@ -98,6 +98,8 @@ public static interface IntegerRep extends Item {
         public int getSize();
         
         public boolean isSliderHint();
+        // Does the slider itself immediately write its value on change?
+        public boolean isSliderImmediate();
         public int getSliderDivisions();
     }
 
diff --git a/src/org/openlcb/cdi/jdom/JdomCdiRep.java b/src/org/openlcb/cdi/jdom/JdomCdiRep.java
index 1c69b9cc..c6e261b3 100644
--- a/src/org/openlcb/cdi/jdom/JdomCdiRep.java
+++ b/src/org/openlcb/cdi/jdom/JdomCdiRep.java
@@ -443,6 +443,18 @@ public boolean isSliderHint() {
             return true;
         }
 
+        @Override
+        public boolean isSliderImmediate() {
+            Element hints = e.getChild("hints");
+            if (hints == null) return false;
+            Element slider = hints.getChild("slider");
+            if (slider == null) return false;
+            Attribute immediate = slider.getAttribute("immediate");
+            if (immediate == null) return false;
+            if (! immediate.getValue().toLowerCase().equals("yes")) return false;
+            return true;
+        }
+
         @Override
         public int getSliderDivisions() {
             Element hints = e.getChild("hints");
diff --git a/src/org/openlcb/cdi/swing/CdiPanel.java b/src/org/openlcb/cdi/swing/CdiPanel.java
index 4205f5f9..53786bb2 100644
--- a/src/org/openlcb/cdi/swing/CdiPanel.java
+++ b/src/org/openlcb/cdi/swing/CdiPanel.java
@@ -65,6 +65,7 @@
 import javax.swing.BorderFactory;
 import javax.swing.Box;
 import javax.swing.BoxLayout;
+import javax.swing.ComboBoxModel;
 import javax.swing.InputVerifier;
 import javax.swing.JButton;
 import javax.swing.JComboBox;
@@ -1971,6 +1972,12 @@ public void actionPerformed(ActionEvent actionEvent) {
                         updateColor();
                     }
                 });
+            } else if (textComponent instanceof JSlider) {
+                ((JSlider) textComponent).addChangeListener(new javax.swing.event.ChangeListener(){
+                    public void stateChanged(javax.swing.event.ChangeEvent e) {
+                        updateColor();
+                    }
+                });
             }
             entryListener = new PropertyChangeListener() {
                 @Override
@@ -2367,6 +2374,7 @@ private class IntPane extends EntryPane {
         JSlider slider = null;
         CdiRep.Map map = null;
         private final ConfigRepresentation.IntegerEntry entry;
+        boolean first = true; // used to suppress slider output on initial change
 
 
         IntPane(ConfigRepresentation.IntegerEntry e) {
@@ -2389,16 +2397,35 @@ public java.awt.Dimension getMaximumSize() {
                 if (entry.rep.isSliderHint()) {
                     // display a slider
                     slider = new JSlider((int)entry.rep.getMin(), (int)entry.rep.getMax());
+                    slider.setOpaque(true); // so you can color it
                     if (entry.rep.getSliderDivisions() > 1) {
                         // display divisions on the slider
                         int divisionSpacing = 
-                            ((int)(entry.rep.getMax()-entry.rep.getMin()))/entry.rep.getSliderDivisions();
+                            (int)Math.round( 
+                                (entry.rep.getMax()-entry.rep.getMin()+0.0) // force float calculation
+                                    /entry.rep.getSliderDivisions()
+                                );
                         slider.setMajorTickSpacing(divisionSpacing);
                         slider.setLabelTable(slider.createStandardLabels(divisionSpacing));
                         slider.setPaintTicks(true);
                         slider.setPaintLabels(true);
                     }
+
+                    // (optionally) listen for changes and immediately write
+                    if (entry.rep.isSliderImmediate()) {
+                        slider.addChangeListener(new javax.swing.event.ChangeListener(){
+                            public void stateChanged(javax.swing.event.ChangeEvent e) {
+                                if (!slider.getValueIsAdjusting()) {
+                                    if (!first) writeDisplayTextToNode();
+                                    first = false;
+                                }
+                            }
+                        });
+                    }
+                    
                     textComponent = slider;
+                    
+                    // set the tooltip to min and max values
                     if (entry.rep.getMin() < 0) {
                         slider.setToolTipText("Signed integer from "
                             +entry.rep.getMin()+" to "+entry.rep.getMax()
@@ -2443,7 +2470,7 @@ protected void writeDisplayTextToNode() {
             } else {
                 // have to get key from stored map value
                 String entry = (String) box.getSelectedItem();
-                String key = map.getKey(entry);
+                String key = map.getKey(entry); 
                 value = Long.parseLong(key);
             }
             entry.setValue(value);
@@ -2461,12 +2488,21 @@ protected void updateDisplayText(@NonNull String value) {
                 if (! box.getSelectedItem().equals(value)) {
                     // not present per-se, see if need to add as reserved?
                     String newValue = "Reserved value: "+value;
-                    box.setSelectedItem(newValue);
-                    if ( ! box.getSelectedItem().equals(newValue)) {
+                    
+                    ComboBoxModel model = box.getModel();
+                    int size = model.getSize();
+                    boolean absent = true;
+                    for(int i=0;i<size;i++) {
+                        String element = (String) model.getElementAt(i);
+                        if (newValue == element) absent = false;
+                    }
+
+                    if (absent) {
+                        // add new reserved element
                         box.addItem(newValue);
-                        box.setSelectedItem(newValue);
-                        map.addItemToMap(newValue, value);
+                        map.addItemToMap(value, newValue);
                     }
+                    box.setSelectedItem(newValue);
                 }
             }
         }
@@ -2666,7 +2702,6 @@ protected void writeDisplayTextToNode() {
                 // if not OK, silently skip; if OK, act
                 if (result == 0) {
                     entry.setValue((long)(entry.rep.getValue()));
-                    System.out.println(entry.rep.getValue());
                     _changeMade = true;
                     notifyTabColorRefresh();
                 }
diff --git a/src/org/openlcb/swing/MemorySpaceSelector.java b/src/org/openlcb/swing/MemorySpaceSelector.java
index d933c13d..00db7e09 100644
--- a/src/org/openlcb/swing/MemorySpaceSelector.java
+++ b/src/org/openlcb/swing/MemorySpaceSelector.java
@@ -24,7 +24,7 @@ public class MemorySpaceSelector extends JTextField  {
      */
     public MemorySpaceSelector(int initialValue) {
         super();
-        setText(""+initialValue);
+        setText("0x"+Integer.toHexString(initialValue).toUpperCase());
     }
 
     /**
@@ -39,7 +39,15 @@ public MemorySpaceSelector() {
      *
      */
     public int getMemorySpace() {
-        int value = Integer.parseInt(getText());
+        int value = 0;
+        String input = getText().trim().toLowerCase();
+        if (input.startsWith("0x")) {
+            // hexadecimal case
+            value = Integer.parseInt(input.substring(2), 16);
+        } else {
+            // decimal case
+            value = Integer.parseInt(input);
+        }
         if (value < 0 ) { 
             value = 0;
             setText(""+value);
diff --git a/src/org/openlcb/swing/memconfig/MemConfigReadWritePane.java b/src/org/openlcb/swing/memconfig/MemConfigReadWritePane.java
index d75e0ada..69c69094 100644
--- a/src/org/openlcb/swing/memconfig/MemConfigReadWritePane.java
+++ b/src/org/openlcb/swing/memconfig/MemConfigReadWritePane.java
@@ -52,7 +52,7 @@ void addLine(JComponent j, String name) {
     JTextField writeDataField = new JTextField(80);
     JTextField configNumberField = new JTextField("40");
     JTextField configAddressField = new JTextField("000000");
-    MemorySpaceSelector addrSpace = new MemorySpaceSelector(255);
+    MemorySpaceSelector addrSpace = new MemorySpaceSelector(0xfF);
 
     /**
      * To be invoked after Swing component installation is complete,