diff --git a/Platform/Apple/tools/jace/src/main/java/jace/apple2e/Apple2e.java b/Platform/Apple/tools/jace/src/main/java/jace/apple2e/Apple2e.java
index bb10b4fc..084d28a1 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/apple2e/Apple2e.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/apple2e/Apple2e.java
@@ -200,7 +200,12 @@ public class Apple2e extends Computer {
         }
         return getDesiredMemoryConfiguration().isInstance((RAM128k) getMemory());
     }
-    
+
+    private boolean isVideoConfigurationCorrect() {
+        VideoImpls videoSelection = videoRenderer.getValue();
+        return videoSelection != null && videoSelection.isInstance(getVideo());
+    }
+
     @Override
     protected RAM createMemory() {
         return getDesiredMemoryConfiguration().create();
@@ -291,7 +296,7 @@ public class Apple2e extends Computer {
                 clock = null;
             }
 
-            if (videoRenderer.getValue() != null && !videoRenderer.getValue().isInstance(getVideo())) {
+            if (!isVideoConfigurationCorrect()) {
                 boolean resumeVideo = false;
                 if (getVideo() != null) {
                     resumeVideo = getVideo().suspend();
diff --git a/Platform/Apple/tools/jace/src/main/java/jace/apple2e/RAM128k.java b/Platform/Apple/tools/jace/src/main/java/jace/apple2e/RAM128k.java
index b6d96b89..c7abc32c 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/apple2e/RAM128k.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/apple2e/RAM128k.java
@@ -71,7 +71,7 @@ abstract public class RAM128k extends RAM {
 
         @Override
         public boolean isInstance(RAM128k card) {
-            return card != null && clazz.isInstance(card);
+            return card != null && clazz.equals(card.getClass());
         }
     }
 
diff --git a/Platform/Apple/tools/jace/src/main/java/jace/cheat/DynamicCheat.java b/Platform/Apple/tools/jace/src/main/java/jace/cheat/DynamicCheat.java
index 68910800..608ed115 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/cheat/DynamicCheat.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/cheat/DynamicCheat.java
@@ -1,7 +1,5 @@
 package jace.cheat;
 
-import javax.script.ScriptException;
-
 import jace.core.RAMEvent;
 import jace.core.RAMListener;
 import javafx.beans.property.BooleanProperty;
@@ -25,20 +23,20 @@ public class DynamicCheat extends RAMListener {
     String cheatName;
     Callback<RAMEvent, Integer> expressionCallback;
 
-    public DynamicCheat(String cheatName, int address, String expr) {
+    public DynamicCheat(String cheatName, int address, int holdValue) {
         super(cheatName, RAMEvent.TYPE.ANY, RAMEvent.SCOPE.ADDRESS, RAMEvent.VALUE.ANY);
         id = (int) (Math.random() * 10000000);
         addr = new SimpleIntegerProperty(address);
-        expression = new SimpleStringProperty(expr);
+        expression = new SimpleStringProperty(String.valueOf(holdValue));
+        isHold = true;
         active = new SimpleBooleanProperty(false);
         name = new SimpleStringProperty("Untitled");
-        expression.addListener((param, oldValue, newValue) -> {
-            expressionCallback = parseExpression(newValue);
-        });
-        expressionCallback = parseExpression(expr);
+        expressionCallback = (RAMEvent e) -> holdValue;
         doConfig();
     }
 
+    boolean isHold = false;
+
     @Override
     protected void doConfig() {
         if (addr != null) {
@@ -75,29 +73,6 @@ public class DynamicCheat extends RAMListener {
         return expression;
     }
 
-    private Callback<RAMEvent, Integer> parseExpression(String expr) {
-        String functionName = "processCheat" + id;
-        String functionBody = "function " + functionName + "(old,val){" + (expr.contains("return") ? expr : "return " + expr) + "}";
-        try {
-            MetaCheat.NASHORN_ENGINE.eval(functionBody);
-            return (RAMEvent e) -> {
-                try {
-                    Object result = MetaCheat.NASHORN_INVOCABLE.invokeFunction(functionName, e.getOldValue(), e.getNewValue());
-                    if (result instanceof Number) {
-                        return ((Number) result).intValue();
-                    } else {
-                        System.err.println("Not able to handle non-numeric return value: " + result.getClass());
-                        return null;
-                    }
-                } catch (ScriptException | NoSuchMethodException ex) {
-                    return null;
-                }
-            };
-        } catch (ScriptException ex) {
-            return null;
-        }
-    }
-
     public static String escape(String in) {
         return in.replaceAll(";", "~~").replaceAll("\n","\\n");
     }
@@ -120,7 +95,7 @@ public class DynamicCheat extends RAMListener {
         Integer addr = Integer.parseInt(parts[2].substring(1), 16);
         String expr = unescape(parts[3]);
         
-        DynamicCheat out = new DynamicCheat(cheatName, addr, expr);
+        DynamicCheat out = new DynamicCheat(cheatName, addr, Integer.parseInt(expr));
         out.name.set(name);
         return out;
     }
diff --git a/Platform/Apple/tools/jace/src/main/java/jace/cheat/MetaCheat.java b/Platform/Apple/tools/jace/src/main/java/jace/cheat/MetaCheat.java
index 3bfc3138..1b23329e 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/cheat/MetaCheat.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/cheat/MetaCheat.java
@@ -11,10 +11,6 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import javax.script.Invocable;
-import javax.script.ScriptEngine;
-import javax.script.ScriptEngineManager;
-
 import jace.Emulator;
 import jace.LawlessLegends;
 import jace.core.CPU;
@@ -33,10 +29,6 @@ import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 
 public class MetaCheat extends Cheats {
-
-    static final ScriptEngine NASHORN_ENGINE = new ScriptEngineManager().getEngineByName("nashorn");
-    static Invocable NASHORN_INVOCABLE = (Invocable) NASHORN_ENGINE;
-
     public enum SearchType {
         VALUE, TEXT, CHANGE
     }
diff --git a/Platform/Apple/tools/jace/src/main/java/jace/hardware/VideoImpls.java b/Platform/Apple/tools/jace/src/main/java/jace/hardware/VideoImpls.java
index 59a0ea0c..52ca2d4c 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/hardware/VideoImpls.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/hardware/VideoImpls.java
@@ -35,6 +35,6 @@ public enum VideoImpls implements DeviceEnum<Video> {
 
     @Override
     public boolean isInstance(Video video) {
-        return clazz.isInstance(video);
+        return video != null && clazz.equals(video.getClass());
     }
 }
\ No newline at end of file
diff --git a/Platform/Apple/tools/jace/src/main/java/jace/ui/MetacheatUI.java b/Platform/Apple/tools/jace/src/main/java/jace/ui/MetacheatUI.java
index 65bb0245..fc3413a7 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/ui/MetacheatUI.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/ui/MetacheatUI.java
@@ -157,7 +157,7 @@ public class MetacheatUI {
 
     @FXML
     void addCheat(ActionEvent event) {
-        cheatEngine.addCheat(new DynamicCheat(event.toString(), 0, "?"));
+        cheatEngine.addCheat(new DynamicCheat(event.toString(), 0, 0));
     }
 
     @FXML
@@ -562,7 +562,7 @@ public class MetacheatUI {
     }
 
     private void addCheat(String name, int addr, int val) {
-        cheatEngine.addCheat(new DynamicCheat(name, addr, String.valueOf(val)));
+        cheatEngine.addCheat(new DynamicCheat(name, addr, val));
     }
 
     int currentlyInspecting = 0;