diff --git a/OutlawEditor/pom.xml b/OutlawEditor/pom.xml
index 2a897ef9..0bfc4a97 100644
--- a/OutlawEditor/pom.xml
+++ b/OutlawEditor/pom.xml
@@ -6,6 +6,12 @@
     <name>OutlawEditor</name>
     <packaging>jar</packaging>
     <version>1.0-SNAPSHOT</version>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <mainClass>org.badvision.outlaweditor.Application</mainClass>
+        <netbeans.hint.license>apache20</netbeans.hint.license>
+    </properties>
+
     <organization>
         <!-- Used as the 'Vendor' for JNLP generation -->
         <name>org.badvision</name>
@@ -14,27 +20,52 @@
         <finalName>OutlawEditor</finalName>
         <plugins>
             <plugin>
-                <groupId>com.zenjava</groupId>
-                <artifactId>javafx-maven-plugin</artifactId>
-                <version>8.1.2</version>
-                <configuration>
-                    outlawEditor
-                    <mainClass>org.badvision.outlaweditor.Application</mainClass>
-                    <!-- only required if signing the jar file -->
-                    <keyStoreAlias>example-user</keyStoreAlias>
-                    <keyStorePassword>example-password</keyStorePassword>
-                    <allPermissions>true</allPermissions>
-                    <bundleType>ALL</bundleType>
-                </configuration>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>2.10</version>
                 <executions>
                     <execution>
-                        <id>package</id>
+                        <id>unpack-dependencies</id>
                         <phase>package</phase>
                         <goals>
-                            <goal>jar</goal>
+                            <goal>unpack-dependencies</goal>
                         </goals>
+                        <configuration>
+                            <excludeScope>system</excludeScope>
+                            <excludeGroupIds>junit,org.mockito,org.hamcrest</excludeGroupIds>
+                            <outputDirectory>${project.build.directory}/classes</outputDirectory>
+                        </configuration>
                     </execution>
-                </executions>            
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.4.0</version>
+                <executions>
+                    <execution>
+                        <id>unpack-dependencies</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>${java.home}/../bin/javapackager</executable>
+                            <arguments>
+                                <argument>-createjar</argument>
+                                <argument>-nocss2bin</argument>
+                                <argument>-appclass</argument>
+                                <argument>${mainClass}</argument>
+                                <argument>-srcdir</argument>
+                                <argument>${project.build.directory}/classes</argument>
+                                <argument>-outdir</argument>
+                                <argument>${project.build.directory}</argument>
+                                <argument>-outfile</argument>
+                                <argument>${project.build.finalName}.jar</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>  
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -43,12 +74,12 @@
                     <source>1.8</source>
                     <target>1.8</target>
                 </configuration>
-                <version>3.1</version>
+                <version>3.5</version>
             </plugin>
             <plugin>
                 <groupId>org.jvnet.jaxb2.maven2</groupId>
                 <artifactId>maven-jaxb2-plugin</artifactId>
-                <version>0.12.3</version>
+                <version>0.13.1</version>
                 <executions>
                     <execution>
                         <goals>
@@ -60,6 +91,17 @@
                             </schemaIncludes>
                             <episodeFile>${project.build.directory}/generated-sources/xjc/META-INF/jaxb-OutlawSchema.episode</episodeFile>
                             <generatePackage>org.badvision.outlaweditor.data.xml</generatePackage>
+                            <args>
+                                <arg>-Xcopyable</arg>
+                                <arg>-Xmergeable</arg>
+                            </args>
+                            <plugins>
+                                <plugin>                                                                
+                                    <groupId>org.jvnet.jaxb2_commons</groupId>
+                                    <artifactId>jaxb2-basics</artifactId>
+                                    <version>0.11.0</version>
+                                </plugin>                                
+                            </plugins>
                         </configuration>
                         <id>jaxb-generate-OutlawSchema</id>
                     </execution>
@@ -69,7 +111,7 @@
     </build>
 
     <dependencies>
-<!--        <dependency>
+        <!--        <dependency>
             <groupId>com.oracle</groupId>
             <artifactId>javafx</artifactId>
             <version>2</version>
@@ -86,9 +128,14 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.12</version>
             <scope>test</scope>
             <type>jar</type>
         </dependency>
+        <dependency>
+            <groupId>org.jvnet.jaxb2_commons</groupId>
+            <artifactId>jaxb2-basics</artifactId>
+            <version>0.11.0</version>
+        </dependency>
     </dependencies>
 </project>
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/Editor.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/Editor.java
index 7525f948..5627badc 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/Editor.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/Editor.java
@@ -10,10 +10,15 @@
  
 package org.badvision.outlaweditor;
 
+import java.util.LinkedList;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javafx.scene.layout.Pane;
+import javax.xml.bind.JAXBException;
 import org.badvision.outlaweditor.data.DataObserver;
 import org.badvision.outlaweditor.data.DataProducer;
 import org.badvision.outlaweditor.data.xml.Script;
+import org.jvnet.jaxb2_commons.lang.CopyTo2;
 
 /**
  * Extremely generic editor abstraction -- useful for uniform edit features
@@ -22,12 +27,15 @@ import org.badvision.outlaweditor.data.xml.Script;
  * @author brobert
  */
 public abstract class Editor<T, D> implements DataObserver<T> {
+    public static final int UNDO_HISTORY_LENGTH = 50;
+    LinkedList<T> undoStates = new LinkedList<>();
 
     T editEntity;
 
     public void setEntity(T t) {
         editEntity = t;
         DataProducer.addObserver(t, this);
+        onEntityUpdated();
     }
 
     public T getEntity() {
@@ -84,4 +92,28 @@ public abstract class Editor<T, D> implements DataObserver<T> {
     }
 
     abstract public void redraw();
+    
+    protected void trackState() {
+        if (undoStates.size() >= UNDO_HISTORY_LENGTH) {
+            undoStates.removeLast();
+        }
+        try {
+            undoStates.push(TransferHelper.cloneObject(getEntity(), (Class<T>) getEntity().getClass(), getEntity().getClass().getName()));
+        } catch (JAXBException ex) {
+            Logger.getLogger(Editor.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+    
+    public void undo() {
+        if (!undoStates.isEmpty()) {
+            CopyTo2 undoState = (CopyTo2) undoStates.removeFirst();
+            undoState.copyTo(getEntity());
+            onEntityUpdated();
+            redraw();
+        }
+    }
+    
+    protected void onEntityUpdated() {
+        
+    }
 }
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/FileUtils.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/FileUtils.java
index feec807b..0ef979f3 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/FileUtils.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/FileUtils.java
@@ -7,7 +7,6 @@
  * ANY KIND, either express or implied. See the License for the specific language 
  * governing permissions and limitations under the License.
  */
- 
 package org.badvision.outlaweditor;
 
 import java.io.ByteArrayInputStream;
@@ -19,6 +18,8 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import java.util.zip.DataFormatException;
 import java.util.zip.Deflater;
 import java.util.zip.Inflater;
@@ -30,6 +31,9 @@ import javafx.stage.FileChooser;
  */
 public class FileUtils {
 
+    private FileUtils() {
+    }
+
     public static enum Extension {
 
         XML("XML files", "xml"),
@@ -64,7 +68,9 @@ public class FileUtils {
         }
         if (create) {
             File file = f.showSaveDialog(Application.getPrimaryStage());
-            if (file == null) return null;
+            if (file == null) {
+                return null;
+            }
             if (!file.getName().contains(".")) {
                 return new File(file.getParentFile(), file.getName() + "." + supportedExtensions[0].extension);
             } else {
@@ -132,8 +138,8 @@ public class FileUtils {
     }
 
     public static byte[] decompress(byte[] bytesToDecompress) {
-        int numberOfBytesToDecompress = bytesToDecompress.length;
         try {
+            int numberOfBytesToDecompress = bytesToDecompress.length;
             Inflater inflater = new Inflater();
             inflater.setInput(
                     bytesToDecompress,
@@ -152,9 +158,9 @@ public class FileUtils {
                     numberOfBytesAfterDecompression);
             inflater.end();
             return returnValues;
-        } catch (DataFormatException dfe) {
-            dfe.printStackTrace(System.err);
+        } catch (DataFormatException ex) {
+            Logger.getLogger(FileUtils.class.getName()).log(Level.SEVERE, null, ex);
+            return null;
         }
-        return null;
     }
 }
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/MapEditor.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/MapEditor.java
index 669fbcee..c3dbacd6 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/MapEditor.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/MapEditor.java
@@ -69,9 +69,8 @@ public class MapEditor extends Editor<Map, MapEditor.DrawMode> implements EventH
     double tileHeight = currentPlatform.tileRenderer.getHeight() * zoom;
 
     @Override
-    public void setEntity(Map t) {
-        super.setEntity(t);
-        currentMap = new TileMap(t);
+    protected void onEntityUpdated() {
+        currentMap = new TileMap(getEntity());
     }
 
     public TileMap getCurrentMap() {
@@ -557,6 +556,12 @@ public class MapEditor extends Editor<Map, MapEditor.DrawMode> implements EventH
     DrawMode lastDrawMode = null;
     Tile lastTile = null;
 
+    @Override
+    protected void trackState() {
+        currentMap.updateBackingMap();
+        super.trackState();
+    }    
+    
     @Override
     public void handle(MouseEvent t) {
         updateCursorAssistant(t);
@@ -580,6 +585,7 @@ public class MapEditor extends Editor<Map, MapEditor.DrawMode> implements EventH
                 if (canSkip) {
                     return;
                 }
+                trackState();
                 plot(x,y,null);
                 redraw();
                 break;
@@ -588,22 +594,26 @@ public class MapEditor extends Editor<Map, MapEditor.DrawMode> implements EventH
                 if (canSkip) {
                     return;
                 }
+                trackState();
                 plot(x, y, getCurrentTile());
                 break;
             case Pencil3px:
                 if (canSkip) {
                     return;
                 }
+                trackState();
                 drawBrush(x, y, 2, getCurrentTile());
                 break;
             case Pencil5px:
                 if (canSkip) {
                     return;
                 }
+                trackState();
                 drawBrush(x, y, 5, getCurrentTile());
                 break;
             case FilledRect:
                 if (t.getEventType().equals(MouseEvent.MOUSE_RELEASED)) {
+                    trackState();
                     fillSelection(t.getX(), t.getY());
                 } else if (t.isPrimaryButtonDown()) {
                     updateSelection(t.getX(), t.getY());
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleImageEditor.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleImageEditor.java
index 3137d19d..7b0c63b4 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleImageEditor.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleImageEditor.java
@@ -33,10 +33,10 @@ import org.badvision.outlaweditor.Application;
 import org.badvision.outlaweditor.FileUtils;
 import org.badvision.outlaweditor.ImageEditor;
 import org.badvision.outlaweditor.Platform;
-import org.badvision.outlaweditor.ui.UIAction;
 import org.badvision.outlaweditor.data.TileMap;
 import org.badvision.outlaweditor.data.xml.Image;
 import org.badvision.outlaweditor.data.xml.PlatformData;
+import org.badvision.outlaweditor.ui.UIAction;
 
 /**
  *
@@ -61,6 +61,12 @@ public class AppleImageEditor extends ImageEditor implements EventHandler<MouseE
         return Platform.AppleII;
     }
 
+    @Override
+    protected void onEntityUpdated() {
+        super.onEntityUpdated();
+        data = null;
+    }
+    
     @Override
     public void buildEditorUI(Pane editorAnchorPane) {
         anchorPane = editorAnchorPane;
@@ -145,28 +151,24 @@ public class AppleImageEditor extends ImageEditor implements EventHandler<MouseE
         currentImage = getPlatform().imageRenderer.renderImage(currentImage, getImageData(), getWidth(), getHeight());
     }
 
-    private byte[] imageData = null;
-
-    public byte[] getImageData() {
-        if (imageData == null) {
-            PlatformData data = getPlatformData(getPlatform());
+    PlatformData data = null;
+    public PlatformData getPlatformData() {
+        if (data == null) {
+            data = getPlatformData(getPlatform());
             if (data == null) {
                 createNewPlatformImage(getPlatform().maxImageWidth, getPlatform().maxImageHeight);
                 data = getPlatformData(getPlatform());
             }
-            imageData = data.getValue();
         }
-        return imageData;
+        return data;
+    }
+    
+    public byte[] getImageData() {
+        return getPlatformData().getValue();
     }
 
     public void setData(byte[] data) {
-        imageData = data;
-        for (PlatformData d : getEntity().getDisplayData()) {
-            if (d.getPlatform().equalsIgnoreCase(getPlatform().name())) {
-                d.setValue(data);
-                break;
-            }
-        }
+        getPlatformData().setValue(data);
     }
 
     public void setDataAndRedraw(byte[] data) {
@@ -242,6 +244,7 @@ public class AppleImageEditor extends ImageEditor implements EventHandler<MouseE
                 if (canSkip) {
                     return false;
                 }
+                trackState();
                 if (alt) {
                     toggleHiBit(x, y);
                 } else {
@@ -253,6 +256,7 @@ public class AppleImageEditor extends ImageEditor implements EventHandler<MouseE
                 if (canSkip) {
                     return false;
                 }
+                trackState();
                 plot(x, y, currentFillPattern, hiBitMatters); // [ref BigBlue1_30]
                 redrawScanline(y);
                 break;
@@ -260,12 +264,14 @@ public class AppleImageEditor extends ImageEditor implements EventHandler<MouseE
                 if (canSkip) {
                     return false;
                 }
+                trackState();
                 drawBrush(x, y, 3, currentFillPattern, hiBitMatters);
                 break;
             case Pencil5px:
                 if (canSkip) {
                     return false;
                 }
+                trackState();
                 drawBrush(x, y, 5, currentFillPattern, hiBitMatters);
                 break;
             case Rectangle:
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleTileEditor.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleTileEditor.java
index 4b278c2c..4c164ecc 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleTileEditor.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/apple/AppleTileEditor.java
@@ -10,7 +10,6 @@
  
 package org.badvision.outlaweditor.apple;
 
-import javafx.event.EventHandler;
 import javafx.scene.Group;
 import javafx.scene.control.Menu;
 import javafx.scene.image.WritableImage;
@@ -22,8 +21,8 @@ import javafx.scene.shape.Rectangle;
 import javafx.scene.shape.Shape;
 import org.badvision.outlaweditor.Platform;
 import org.badvision.outlaweditor.TileEditor;
-import org.badvision.outlaweditor.data.xml.Tile;
 import org.badvision.outlaweditor.data.TileUtils;
+import org.badvision.outlaweditor.data.xml.Tile;
 
 /**
  *
@@ -99,6 +98,7 @@ public class AppleTileEditor extends TileEditor {
         debounceTime = System.currentTimeMillis() + SAFE_WAIT_TIME;
         lastActionX = x;
         lastActionY = y;
+        trackState();
         switch (drawMode) {
             case Toggle:
                 if (alt) {
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/data/TileMap.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/data/TileMap.java
index 7a4aabee..e7c0850e 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/data/TileMap.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/data/TileMap.java
@@ -7,7 +7,6 @@
  * ANY KIND, either express or implied. See the License for the specific language 
  * governing permissions and limitations under the License.
  */
- 
 package org.badvision.outlaweditor.data;
 
 import java.io.Serializable;
@@ -95,7 +94,7 @@ public class TileMap extends ArrayList<ArrayList<Tile>> implements Serializable
 
     private void registerLocationScript(int x, int y, Script s) {
         if (!scriptColors.containsKey(s)) {
-            scriptColors.put(s, Color.hsb(HUE, SATURATION, 0.75 + Math.cos(HUE / Math.PI / 2.0)/8.0));
+            scriptColors.put(s, Color.hsb(HUE, SATURATION, 0.75 + Math.cos(HUE / Math.PI / 2.0) / 8.0));
             HUE = (HUE + 27) % 360;
         }
         int loc = getMortonNumber(x, y);
@@ -178,7 +177,8 @@ public class TileMap extends ArrayList<ArrayList<Tile>> implements Serializable
         Set<Tile> unknownTiles = new HashSet<>();
         Scripts scripts = m.getScripts();
         if (scripts != null) {
-            scripts.getScript().forEach(
+            List<Script> allScripts = new ArrayList<>(scripts.getScript());
+            allScripts.forEach(
                     s -> s.getLocationTrigger().forEach(
                             l -> registerLocationScript(l.getX(), l.getY(), s)
                     )
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/ApplicationMenuController.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/ApplicationMenuController.java
index cb3f39ae..08087df2 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/ApplicationMenuController.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/ApplicationMenuController.java
@@ -58,4 +58,7 @@ public abstract class ApplicationMenuController {
     @FXML
     abstract public void onHelpAbout(ActionEvent event);
 
+    @FXML
+    abstract public void performUndo(ActionEvent event);    
+    
 }
diff --git a/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/impl/ApplicationMenuControllerImpl.java b/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/impl/ApplicationMenuControllerImpl.java
index 5c1a7238..a5e49836 100644
--- a/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/impl/ApplicationMenuControllerImpl.java
+++ b/OutlawEditor/src/main/java/org/badvision/outlaweditor/ui/impl/ApplicationMenuControllerImpl.java
@@ -15,6 +15,7 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 import javafx.event.ActionEvent;
 import org.badvision.outlaweditor.Application;
+import org.badvision.outlaweditor.Editor;
 import org.badvision.outlaweditor.Platform;
 import org.badvision.outlaweditor.apple.AppleTileRenderer;
 import org.badvision.outlaweditor.ui.ApplicationMenuController;
@@ -127,4 +128,12 @@ public class ApplicationMenuControllerImpl extends ApplicationMenuController {
         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
     }
 
+    @Override
+    public void performUndo(ActionEvent event) {
+        Editor editor = ApplicationUIController.getController().getVisibleEditor();
+        if (editor != null) {
+            editor.undo();
+        }
+    }
+
 }
diff --git a/OutlawEditor/src/main/resources/Menubar.fxml b/OutlawEditor/src/main/resources/Menubar.fxml
index 6f7a6a8e..040fd934 100644
--- a/OutlawEditor/src/main/resources/Menubar.fxml
+++ b/OutlawEditor/src/main/resources/Menubar.fxml
@@ -1,12 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
+<?import javafx.scene.input.*?>
 <?import java.lang.*?>
 <?import java.util.*?>
 <?import javafx.scene.*?>
 <?import javafx.scene.control.*?>
 <?import javafx.scene.layout.*?>
 
-<MenuBar styleClass="menu" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="org.badvision.outlaweditor.ui.impl.ApplicationMenuControllerImpl">
+<MenuBar styleClass="menu" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="org.badvision.outlaweditor.ui.impl.ApplicationMenuControllerImpl">
     <menus>
         <Menu mnemonicParsing="false" text="File">
             <items>
@@ -21,6 +22,11 @@
                 <MenuItem mnemonicParsing="false" onAction="#onEditSelect" text="Select" />
                 <MenuItem mnemonicParsing="false" onAction="#onEditCopy" text="Copy" />
                 <MenuItem mnemonicParsing="false" onAction="#onEditPaste" text="Paste" />
+            <MenuItem mnemonicParsing="false" onAction="#performUndo" text="Undo">
+               <accelerator>
+                  <KeyCodeCombination alt="UP" code="Z" control="DOWN" meta="UP" shift="UP" shortcut="UP" />
+               </accelerator>
+            </MenuItem>
                 <Menu mnemonicParsing="false" text="Change Platform">
                     <items>
                         <MenuItem mnemonicParsing="false" onAction="#onChangePlatformAppleSolid" text="Apple (solid)" />
@@ -38,4 +44,4 @@
             </items>
         </Menu>
     </menus>
-</MenuBar>
\ No newline at end of file
+</MenuBar>
diff --git a/Platform/Apple/tools/PLASMA/src/plvm.c b/Platform/Apple/tools/PLASMA/src/plvm.c
index 59d841dc..7aa5d20f 100755
--- a/Platform/Apple/tools/PLASMA/src/plvm.c
+++ b/Platform/Apple/tools/PLASMA/src/plvm.c
@@ -614,8 +614,10 @@ void interp(code *ip)
                 ea  = POP;
                 PUSH(ea >> val);
                 break;
-            case 0x1E: // IDXW : TOS = TOS * 2
-                TOS *= 2;
+            case 0x1E: // IDXW : TOS = TOS * 2 + TOS-1
+                val = POP;
+                ea  = POP;
+                PUSH(ea + val * 2);
                 break;
                 /*
                  * 0x20-0x2F