diff --git a/src/main/java/de/neemann/digital/analyse/ModelAnalyserInfo.java b/src/main/java/de/neemann/digital/analyse/ModelAnalyserInfo.java
index f7575a650..6230f7209 100644
--- a/src/main/java/de/neemann/digital/analyse/ModelAnalyserInfo.java
+++ b/src/main/java/de/neemann/digital/analyse/ModelAnalyserInfo.java
@@ -7,7 +7,6 @@ package de.neemann.digital.analyse;
 
 import de.neemann.digital.core.Model;
 import de.neemann.digital.core.Signal;
-import de.neemann.digital.gui.Main;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -25,7 +24,7 @@ public class ModelAnalyserInfo {
     private ArrayList<Signal> inputs;
     private ArrayList<Signal> outputs;
     private ArrayList<String> pinsWithoutNumber;
-    private Main.CreatedNotification mainCreatedNotification;
+    private String stateSignalName;
 
     /**
      * creates a new instance
@@ -132,22 +131,6 @@ public class ModelAnalyserInfo {
         return outputBusMap;
     }
 
-    /**
-     * Sets the fsm state info;
-     *
-     * @param info the info instance
-     */
-    public void setMainCreatedNotification(Main.CreatedNotification info) {
-        mainCreatedNotification = info;
-    }
-
-    /**
-     * @return the fsm state info
-     */
-    public Main.CreatedNotification getMainCreatedNotification() {
-        return mainCreatedNotification;
-    }
-
     /**
      * Gets the init value of a sequential state machine
      *
@@ -171,4 +154,19 @@ public class ModelAnalyserInfo {
         initValueMap.put(name, value);
     }
 
+    /**
+     * @return the state variable name, maybe null
+     */
+    public String getStateSignalName() {
+        return stateSignalName;
+    }
+
+    /**
+     * Sets the state variable name
+     *
+     * @param stateSignalName the state variable name
+     */
+    public void setStateSignalName(String stateSignalName) {
+        this.stateSignalName = stateSignalName;
+    }
 }
diff --git a/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java b/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
index b4c2a852f..9a2b87805 100644
--- a/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
+++ b/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
@@ -6,9 +6,6 @@
 package de.neemann.digital.builder.circuit;
 
 import de.neemann.digital.analyse.DetermineJKStateMachine;
-import de.neemann.digital.core.memory.DataField;
-import de.neemann.digital.core.memory.LookUpTable;
-import de.neemann.digital.fsm.FSMStateInfo;
 import de.neemann.digital.analyse.ModelAnalyserInfo;
 import de.neemann.digital.analyse.expression.*;
 import de.neemann.digital.analyse.expression.Not;
@@ -24,6 +21,8 @@ import de.neemann.digital.core.io.Const;
 import de.neemann.digital.core.io.In;
 import de.neemann.digital.core.io.Out;
 import de.neemann.digital.core.io.Probe;
+import de.neemann.digital.core.memory.DataField;
+import de.neemann.digital.core.memory.LookUpTable;
 import de.neemann.digital.core.wiring.Clock;
 import de.neemann.digital.core.wiring.Splitter;
 import de.neemann.digital.draw.elements.Circuit;
@@ -32,7 +31,6 @@ import de.neemann.digital.draw.elements.VisualElement;
 import de.neemann.digital.draw.elements.Wire;
 import de.neemann.digital.draw.graphics.Vector;
 import de.neemann.digital.draw.shapes.ShapeFactory;
-import de.neemann.digital.gui.Main;
 import de.neemann.digital.lang.Lang;
 
 import java.util.*;
@@ -445,11 +443,9 @@ public class CircuitBuilder implements BuilderInterface<CircuitBuilder> {
             outSplitterY = addNetConnections(circuit, maxWidth + SIZE * 17, outSplitterY);
 
         if (mai != null) {
-            Main.CreatedNotification mon = mai.getMainCreatedNotification();
-            if (mon instanceof FSMStateInfo) {
-                FSMStateInfo fsmInfo = (FSMStateInfo) mon;
-                outSplitterY = createStateVar(maxWidth + SIZE * 15, outSplitterY, circuit, fsmInfo.getSignalName());
-            }
+            final String stateVariableName = mai.getStateSignalName();
+            if (stateVariableName != null)
+                outSplitterY = createStateVar(maxWidth + SIZE * 15, outSplitterY, circuit, stateVariableName);
         }
 
         circuit.setModified(false);
diff --git a/src/main/java/de/neemann/digital/core/GlobalValues.java b/src/main/java/de/neemann/digital/core/GlobalValues.java
new file mode 100644
index 000000000..5e498a210
--- /dev/null
+++ b/src/main/java/de/neemann/digital/core/GlobalValues.java
@@ -0,0 +1,74 @@
+package de.neemann.digital.core;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+
+/**
+ * Instance used by the model to share signal values.
+ * Used by the FSM dialog to indicate the current state.
+ * Up to now only probe values are shared.
+ */
+public final class GlobalValues {
+    private static final Logger LOGGER = LoggerFactory.getLogger(GlobalValues.class);
+    private static GlobalValues ourInstance = new GlobalValues();
+
+    /**
+     * @return returns the global instance
+     */
+    public static GlobalValues getInstance() {
+        return ourInstance;
+    }
+
+    private ArrayList<GlobalValueListener> listeners = new ArrayList<>();
+
+    private GlobalValues() {
+    }
+
+    /**
+     * Registers a value
+     *
+     * @param name  the name of the value
+     * @param value the value itself
+     * @param model the model the value belongs to
+     */
+    public void register(String name, ObservableValue value, Model model) {
+        for (GlobalValueListener l : listeners)
+            l.valueCreated(name, value, model);
+    }
+
+    /**
+     * Adds a listener for global values
+     *
+     * @param listener the listener to add
+     */
+    public void addListener(GlobalValueListener listener) {
+        listeners.add(listener);
+        LOGGER.debug("global value listener added " + listeners.size());
+    }
+
+    /**
+     * Removes a listener for global values
+     *
+     * @param listener the listener to remove
+     */
+    public void removeListener(GlobalValueListener listener) {
+        listeners.remove(listener);
+        LOGGER.debug("global value listener removed " + listeners.size());
+    }
+
+    /**
+     * A listener for global values
+     */
+    public interface GlobalValueListener {
+        /**
+         * Called if a value is created
+         *
+         * @param name  the name of the value
+         * @param value the value itself
+         * @param model the model the value belongs to
+         */
+        void valueCreated(String name, ObservableValue value, Model model);
+    }
+}
diff --git a/src/main/java/de/neemann/digital/core/io/Probe.java b/src/main/java/de/neemann/digital/core/io/Probe.java
index 67ad09971..e83b8c9e0 100644
--- a/src/main/java/de/neemann/digital/core/io/Probe.java
+++ b/src/main/java/de/neemann/digital/core/io/Probe.java
@@ -54,6 +54,7 @@ public class Probe implements Element {
     @Override
     public void registerNodes(Model model) {
         model.addSignal(new Signal(label, value).setFormat(format));
+        GlobalValues.getInstance().register(label, value, model);
     }
 
 }
diff --git a/src/main/java/de/neemann/digital/fsm/FSM.java b/src/main/java/de/neemann/digital/fsm/FSM.java
index 329a45135..963578ecf 100644
--- a/src/main/java/de/neemann/digital/fsm/FSM.java
+++ b/src/main/java/de/neemann/digital/fsm/FSM.java
@@ -13,10 +13,10 @@ import de.neemann.digital.analyse.expression.ExpressionException;
 import de.neemann.digital.draw.graphics.Graphic;
 import de.neemann.digital.draw.graphics.Vector;
 import de.neemann.digital.draw.graphics.VectorFloat;
-import de.neemann.digital.fsm.gui.FSMFrame;
 import de.neemann.digital.lang.Lang;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -126,7 +126,7 @@ public class FSM {
      * @throws IOException IOException
      */
     public void save(OutputStream out) throws IOException {
-        try (Writer w = new OutputStreamWriter(out, "utf-8")) {
+        try (Writer w = new OutputStreamWriter(out, StandardCharsets.UTF_8)) {
             XStream xStream = getxStream();
             w.write("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
             xStream.marshal(this, new PrettyPrintWriter(w));
@@ -341,13 +341,13 @@ public class FSM {
     /**
      * Creates the truth table which is defined by this finite state machine
      *
-     * @param creator the creator of the truth table
+     * @param stateSignalName the name of the signal used to represent the state
      * @return the truth table
      * @throws ExpressionException         ExpressionException
      * @throws FiniteStateMachineException FiniteStateMachineException
      */
-    public TruthTable createTruthTable(FSMFrame creator) throws ExpressionException, FiniteStateMachineException {
-        return new TransitionTableCreator(this, creator).create();
+    public TruthTable createTruthTable(String stateSignalName) throws ExpressionException, FiniteStateMachineException {
+        return new TransitionTableCreator(this, stateSignalName).create();
     }
 
     /**
diff --git a/src/main/java/de/neemann/digital/fsm/FSMStateInfo.java b/src/main/java/de/neemann/digital/fsm/FSMStateInfo.java
deleted file mode 100644
index d185f634e..000000000
--- a/src/main/java/de/neemann/digital/fsm/FSMStateInfo.java
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (c) 2018 Helmut Neemann.
- * Use of this source code is governed by the GPL v3 license
- * that can be found in the LICENSE file.
- */
-package de.neemann.digital.fsm;
-
-import de.neemann.digital.fsm.gui.FSMFrame;
-import de.neemann.digital.gui.Main;
-
-import java.io.File;
-
-/**
- * The model state info
- */
-public class FSMStateInfo implements Main.CreatedNotification {
-    private final String signalName;
-    private final FSMFrame fsmFrame;
-
-    /**
-     * Creates a new instance
-     *
-     * @param file     the file of the fsm, maybe null
-     * @param fsmFrame the creator, maybe null
-     */
-    public FSMStateInfo(File file, FSMFrame fsmFrame) {
-        this.fsmFrame = fsmFrame;
-        if (file != null)
-            this.signalName = file.getName();
-        else
-            this.signalName = "state";
-    }
-
-    /**
-     * @return the signal name used for state transfer
-     */
-    public String getSignalName() {
-        return signalName;
-    }
-
-    @Override
-    public void isCreated(Main main) {
-        if (fsmFrame != null)
-            fsmFrame.registerTo(main);
-    }
-}
diff --git a/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java b/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java
index 9bea3cfa8..48a96ff69 100644
--- a/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java
+++ b/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java
@@ -12,7 +12,6 @@ import de.neemann.digital.analyse.expression.ExpressionException;
 import de.neemann.digital.analyse.expression.Variable;
 import de.neemann.digital.analyse.expression.VariableVisitor;
 import de.neemann.digital.core.Signal;
-import de.neemann.digital.fsm.gui.FSMFrame;
 import de.neemann.digital.lang.Lang;
 
 import java.util.*;
@@ -46,16 +45,16 @@ public class TransitionTableCreator {
     /**
      * Creates a new instance
      *
-     * @param fsm     the fsm
-     * @param creator the creating frame
+     * @param fsm             the fsm
+     * @param stateSignalName the name if the signal indicating the actual state
      */
-    TransitionTableCreator(FSM fsm, FSMFrame creator) throws FiniteStateMachineException {
+    TransitionTableCreator(FSM fsm, String stateSignalName) throws FiniteStateMachineException {
         this.states = fsm.getStates();
         this.transitions = fsm.getTransitions();
         this.initState = fsm.getInitState();
         outputValues = new HashMap<>();
         modelAnalyserInfo = new ModelAnalyserInfo(null);
-        modelAnalyserInfo.setMainCreatedNotification(new FSMStateInfo(fsm.getFile(), creator));
+        modelAnalyserInfo.setStateSignalName(stateSignalName);
         inputSignals = new ArrayList<>();
         outputSignals = new ArrayList<>();
     }
diff --git a/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java b/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java
index e14a89ef7..8b8c6c861 100644
--- a/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java
+++ b/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java
@@ -5,10 +5,7 @@
  */
 package de.neemann.digital.fsm.gui;
 
-import de.neemann.digital.core.Model;
-import de.neemann.digital.core.ModelEvent;
-import de.neemann.digital.core.ObservableValue;
-import de.neemann.digital.core.Signal;
+import de.neemann.digital.core.*;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.draw.graphics.*;
 import de.neemann.digital.draw.library.ElementLibrary;
@@ -37,7 +34,7 @@ import java.util.prefs.Preferences;
 /**
  * The dialog to show the FSM
  */
-public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSave, FSM.ModifiedListener, ModelCreationListener, FileHistory.OpenInterface {
+public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSave, FSM.ModifiedListener, FileHistory.OpenInterface {
     private static final Preferences PREFS = Preferences.userRoot().node("dig").node("fsm");
     private static final String PREF_FOLDER = "folder";
     private static final Icon ICON_NEW = IconCreator.create("document-new.png");
@@ -59,6 +56,7 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
     private File baseFilename;
     private boolean lastModified;
     private String probeLabelName;
+    private GlobalValues.GlobalValueListener stateListener = new StateListener();
 
     /**
      * Creates a new instance
@@ -89,11 +87,13 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
             }
         });
 
+        GlobalValues.getInstance().addListener(stateListener);
         addWindowListener(new ClosingWindowListener(this, this));
         addWindowListener(new WindowAdapter() {
             @Override
             public void windowClosed(WindowEvent windowEvent) {
                 timer.stop();
+                GlobalValues.getInstance().removeListener(stateListener);
             }
         });
 
@@ -355,7 +355,7 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
             @Override
             public void actionPerformed(ActionEvent actionEvent) {
                 try {
-                    new TableDialog(FSMFrame.this, fsm.createTruthTable(FSMFrame.this), library, filename).setVisible(true);
+                    new TableDialog(FSMFrame.this, fsm.createTruthTable(getStateSignalName()), library, filename).setVisible(true);
                 } catch (Exception e) {
                     new ErrorMessage(Lang.get("msg_fsmCantCreateTable")).addCause(e).show(FSMFrame.this);
                 }
@@ -432,28 +432,27 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
         toolBar.add(viewHelp);
     }
 
-    @Override
-    public void created(Model model) {
-        String name = "state";
+
+    private class StateListener implements GlobalValues.GlobalValueListener {
+        @Override
+        public void valueCreated(String name, ObservableValue value, Model model) {
+            if (name.equals(getStateSignalName())) {
+                value.addObserverToValue(() -> setActiveState(value.getValue()));
+                setActiveState(value.getValue());
+                model.addObserver(event -> {
+                            if (event == ModelEvent.STOPPED)
+                                setActiveState(-1);
+                        }, ModelEvent.STOPPED
+                );
+            }
+        }
+    }
+
+    private String getStateSignalName() {
         if (filename != null)
-            name = filename.getName();
-
-        Signal found = null;
-        for (Signal s : model.getSignals()) {
-            if (s.getName().equals(name))
-                found = s;
-        }
-
-        if (found != null) {
-            ObservableValue value = found.getValue();
-            value.addObserverToValue(() -> setActiveState(value.getValue()));
-            setActiveState(value.getValue());
-            model.addObserver(event -> {
-                        if (event == ModelEvent.STOPPED)
-                            setActiveState(-1);
-                    }, ModelEvent.STOPPED
-            );
-        }
+            return filename.getName();
+        else
+            return "state";
     }
 
     private void setActiveState(long value) {
@@ -461,23 +460,6 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
             SwingUtilities.invokeLater(fsmComponent::repaint);
     }
 
-    /**
-     * Registers a circuit window to this fsm
-     *
-     * @param main the main window
-     * @return this for chained calls
-     */
-    public FSMFrame registerTo(Main main) {
-        main.addModelCreationListener(this);
-        addWindowListener(new WindowAdapter() {
-            @Override
-            public void windowClosed(WindowEvent windowEvent) {
-                main.removeModelCreationListener(FSMFrame.this);
-            }
-        });
-        return this;
-    }
-
     /**
      * @return the current fsm
      */
diff --git a/src/main/java/de/neemann/digital/gui/Main.java b/src/main/java/de/neemann/digital/gui/Main.java
index 26fefaf34..0df32975b 100644
--- a/src/main/java/de/neemann/digital/gui/Main.java
+++ b/src/main/java/de/neemann/digital/gui/Main.java
@@ -145,7 +145,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
     private State runModelMicroState;
     private JComponent componentOnPane;
     private LibraryTreeModel treeModel;
-    private ArrayList<ModelCreationListener> modelCreationListener = new ArrayList<>();
 
     /**
      * Creates a new instance
@@ -288,8 +287,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
         } else
             setLocationRelativeTo(null);
 
-        if (builder.createdNotification != null)
-            builder.createdNotification.isCreated(this);
     }
 
     private void enableClockShortcut() {
@@ -1150,7 +1147,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
                 new FSMFrame(Main.this, library)
                         .setBaseFileName(filename)
                         .setProbeLabelName(foundName)
-                        .registerTo(Main.this)
                         .setVisible(true);
             }
         }
@@ -1158,24 +1154,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
                 .createJMenuItem());
     }
 
-    /**
-     * Adds a model creation listener
-     *
-     * @param listener the listener to add
-     */
-    public void addModelCreationListener(ModelCreationListener listener) {
-        modelCreationListener.add(listener);
-    }
-
-    /**
-     * Removes a model creation listener
-     *
-     * @param listener the listener to remove
-     */
-    public void removeModelCreationListener(ModelCreationListener listener) {
-        modelCreationListener.remove(listener);
-    }
-
     private void orderMeasurements() {
         try {
             Model m = new ModelCreator(circuitComponent.getCircuit(), library).createModel(false);
@@ -1325,9 +1303,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
 
             model.init();
 
-            for (ModelCreationListener mcl : modelCreationListener)
-                mcl.created(model);
-
             if (updateEvent == ModelEvent.MICROSTEP)
                 doStep.setEnabled(model.needsUpdate());
 
@@ -1824,7 +1799,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
         private boolean allowAllFileActions = true;
         private File baseFileName;
         private boolean keepPrefMainFile;
-        private CreatedNotification createdNotification;
 
         /**
          * @param fileToOpen the file to open
@@ -1892,17 +1866,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
             return this;
         }
 
-        /**
-         * Sets a open notification
-         *
-         * @param createdNotification createdNotification
-         * @return this for chained calls
-         */
-        public MainBuilder setCreatedNotification(CreatedNotification createdNotification) {
-            this.createdNotification = createdNotification;
-            return this;
-        }
-
         /**
          * Creates a new Main instance
          *
@@ -1921,18 +1884,6 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
 
     }
 
-    /**
-     * Notification if a main frame is created
-     */
-    public interface CreatedNotification {
-        /**
-         * Called if main frae is created
-         *
-         * @param main main
-         */
-        void isCreated(Main main);
-    }
-
     private class ModelKeyListener extends KeyAdapter {
 
         @Override
diff --git a/src/main/java/de/neemann/digital/gui/ModelCreationListener.java b/src/main/java/de/neemann/digital/gui/ModelCreationListener.java
deleted file mode 100644
index f974f174b..000000000
--- a/src/main/java/de/neemann/digital/gui/ModelCreationListener.java
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (c) 2018 Helmut Neemann.
- * Use of this source code is governed by the GPL v3 license
- * that can be found in the LICENSE file.
- */
-package de.neemann.digital.gui;
-
-import de.neemann.digital.core.Model;
-
-/**
- * Listener notified every time a model is created
- */
-public interface ModelCreationListener {
-    /**
-     * Called if a model is created
-     *
-     * @param model the model created
-     */
-    void created(Model model);
-}
diff --git a/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java b/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
index be8b91e7c..bf84a1c3e 100644
--- a/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
@@ -518,15 +518,11 @@ public class TableDialog extends JDialog {
                     .create(lastGeneratedExpressions);
             Circuit circuit = circuitBuilder.createCircuit();
 
-            Main.CreatedNotification mon = null;
-            if (modelAnalyzerInfo != null)
-                mon = modelAnalyzerInfo.getMainCreatedNotification();
             new Main.MainBuilder()
                     .setParent(TableDialog.this)
                     .setLibrary(library)
                     .setCircuit(circuit)
                     .setBaseFileName(filename)
-                    .setCreatedNotification(mon)
                     .openLater();
         } catch (ExpressionException | FormatterException | RuntimeException e) {
             new ErrorMessage(Lang.get("msg_errorDuringCalculation")).addCause(e).show(this);