diff --git a/src/main/java/de/neemann/digital/gui/Main.java b/src/main/java/de/neemann/digital/gui/Main.java
index 760c1c57e..ba05d63d4 100644
--- a/src/main/java/de/neemann/digital/gui/Main.java
+++ b/src/main/java/de/neemann/digital/gui/Main.java
@@ -70,6 +70,7 @@ import static javax.swing.JOptionPane.showInputDialog;
  */
 public final class Main extends JFrame implements ClosingWindowListener.ConfirmSave, ErrorStopper, FileHistory.OpenInterface, DigitalRemoteInterface, StatusInterface {
     private static final ArrayList<Key> ATTR_LIST = new ArrayList<>();
+    private static final String KEY_START_STOP_ACTION = "startStop";
     private static boolean experimental;
 
     private static File lastExportDirectory;
@@ -752,6 +753,17 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
             }
         }.setToolTip(Lang.get("menu_editRunAttributes_tt"));
 
+        circuitComponent.getInputMap().put(KeyStroke.getKeyStroke(' '), KEY_START_STOP_ACTION);
+        circuitComponent.getActionMap().put(KEY_START_STOP_ACTION, new AbstractAction() {
+            @Override
+            public void actionPerformed(ActionEvent actionEvent) {
+                if (model == null)
+                    runModelAction.actionPerformed(actionEvent);
+                else
+                    stoppedStateAction.actionPerformed(actionEvent);
+            }
+        });
+
         JMenu run = new JMenu(Lang.get("menu_sim"));
         menuBar.add(run);
         run.add(editRunAttributes.createJMenuItem());
diff --git a/src/main/java/de/neemann/gui/ToolTipAction.java b/src/main/java/de/neemann/gui/ToolTipAction.java
index ddde53148..cf6341782 100644
--- a/src/main/java/de/neemann/gui/ToolTipAction.java
+++ b/src/main/java/de/neemann/gui/ToolTipAction.java
@@ -10,6 +10,7 @@ import java.awt.*;
 public abstract class ToolTipAction extends AbstractAction {
     private Icon icon;
     private String toolTipText;
+    private KeyStroke accelerator;
 
     /**
      * Creates a new instance
@@ -59,6 +60,17 @@ public abstract class ToolTipAction extends AbstractAction {
         return this;
     }
 
+    /**
+     * Sets an accelerator to the item
+     *
+     * @param accelerator the accelerator
+     * @return this for call chaining
+     */
+    public ToolTipAction setAccelerator(KeyStroke accelerator) {
+        this.accelerator = accelerator;
+        return this;
+    }
+
     /**
      * Sets the activated state for this action
      *
@@ -109,6 +121,8 @@ public abstract class ToolTipAction extends AbstractAction {
      */
     public JMenuItem createJMenuItem() {
         JMenuItem i = new JMenuItem(this);
+        if (accelerator!=null)
+            i.setAccelerator(accelerator);
         if (toolTipText != null) {
             i.setToolTipText(toolTipText);
         }