diff --git a/src/main/java/de/neemann/digital/gui/components/data/DataSet.java b/src/main/java/de/neemann/digital/gui/components/data/DataSet.java
index 297e98167..3715916ad 100644
--- a/src/main/java/de/neemann/digital/gui/components/data/DataSet.java
+++ b/src/main/java/de/neemann/digital/gui/components/data/DataSet.java
@@ -24,6 +24,7 @@ public class DataSet implements Iterable<DataSample>, Drawable {
     private final int maxTextLength;
     private DataSample min;
     private DataSample max;
+    private double size = SIZE;
 
     /**
      * Creates a simple dummy DataSet used for creating the DataShape
@@ -138,6 +139,25 @@ public class DataSet implements Iterable<DataSample>, Drawable {
     private static final int SEP2 = 5;
     private static final int SEP = SEP2 * 2;
 
+    /**
+     * Fits the data in the visible area
+     *
+     * @param width width of the frame
+     */
+    public void fitInside(int width) {
+        size = ((double) (width - getTextBorder())) / size();
+    }
+
+    /**
+     * Apply a scaling factor
+     *
+     * @param f the factor
+     */
+    public void scale(double f) {
+        size *= f;
+        if (size < Style.NORMAL.getThickness()) size = Style.NORMAL.getThickness();
+        if (size > SIZE * 4) size = SIZE * 4;
+    }
 
     @Override
     synchronized public void drawTo(Graphic g, Style highLight) {
@@ -148,32 +168,33 @@ public class DataSet implements Iterable<DataSample>, Drawable {
         for (int i = 0; i < signalSize(); i++) {
             String text = getSignal(i).getName();
             g.drawText(new Vector(x - 2, y + yOffs), new Vector(x + 1, y + yOffs), text, Orientation.RIGHTCENTER, Style.NORMAL);
-            g.drawLine(new Vector(x, y - SEP2), new Vector(x + SIZE * size(), y - SEP2), Style.DASH);
+            g.drawLine(new Vector(x, y - SEP2), new Vector(x + (int) (size * size()), y - SEP2), Style.DASH);
             y += SIZE + SEP;
         }
-        g.drawLine(new Vector(x, y - SEP2), new Vector(x + SIZE * size(), y - SEP2), Style.DASH);
+        g.drawLine(new Vector(x, y - SEP2), new Vector(x + (int) (size * size()), y - SEP2), Style.DASH);
 
 
         int[] lastRy = new int[signalSize()];
         boolean first = true;
+        double pos = 0;
         for (DataSample s : this) {
-            g.drawLine(new Vector(x, BORDER - SEP2), new Vector(x, (SIZE + SEP) * signalSize() + BORDER - SEP2), Style.DASH);
+            int xx = (int) (pos + x);
+            g.drawLine(new Vector(xx, BORDER - SEP2), new Vector(xx, (SIZE + SEP) * signalSize() + BORDER - SEP2), Style.DASH);
             y = BORDER;
             for (int i = 0; i < signalSize(); i++) {
 
                 long width = getWidth(i);
                 if (width == 0) width = 1;
-                //int ry = (int) (SIZE-(SIZE*(s.getValue(i)-dataSet.getMin().getValue(i)))/ width);
                 int ry = (int) (SIZE - (SIZE * s.getValue(i)) / width);
-                g.drawLine(new Vector(x, y + ry), new Vector(x + SIZE, y + ry), Style.NORMAL);
+                g.drawLine(new Vector(xx, y + ry), new Vector((int) (xx + size), y + ry), Style.NORMAL);
                 if (!first && ry != lastRy[i])
-                    g.drawLine(new Vector(x, y + lastRy[i]), new Vector(x, y + ry), Style.NORMAL);
+                    g.drawLine(new Vector(xx, y + lastRy[i]), new Vector(xx, y + ry), Style.NORMAL);
 
                 lastRy[i] = ry;
                 y += SIZE + SEP;
             }
             first = false;
-            x += SIZE;
+            pos += size;
         }
         g.drawLine(new Vector(x, BORDER - SEP2), new Vector(x, (SIZE + SEP) * signalSize() + BORDER - SEP2), Style.DASH);
     }
@@ -196,6 +217,13 @@ public class DataSet implements Iterable<DataSample>, Drawable {
         return signalSize() * (SIZE + SEP) + 2 * BORDER;
     }
 
+    /**
+     * @return the current width of the graphical representation
+     */
+    public int getCurrentGraphicWidth() {
+        return getTextBorder() + (int) (size() * size);
+    }
+
     /**
      * @return the signals stored
      */
diff --git a/src/main/java/de/neemann/digital/gui/components/data/DataSetComponent.java b/src/main/java/de/neemann/digital/gui/components/data/DataSetComponent.java
index b30230055..669ce92fc 100644
--- a/src/main/java/de/neemann/digital/gui/components/data/DataSetComponent.java
+++ b/src/main/java/de/neemann/digital/gui/components/data/DataSetComponent.java
@@ -21,6 +21,10 @@ public class DataSetComponent extends JComponent {
      */
     public DataSetComponent(DataSet dataSet) {
         this.dataSet = dataSet;
+        addMouseWheelListener(e -> {
+            double f = Math.pow(0.9, e.getWheelRotation());
+            scale(f);  // ToDo keep relative mouse position
+        });
     }
 
     @Override
@@ -34,8 +38,30 @@ public class DataSetComponent extends JComponent {
 
     @Override
     public Dimension getPreferredSize() {
-        int w = dataSet.getGraphicWidth();
+        int w = dataSet.getCurrentGraphicWidth();
         if (w < 600) w = 600;
         return new Dimension(w, dataSet.getGraphicHeight());
     }
+
+    /**
+     * Apply a scaling factor
+     *
+     * @param f the factor
+     */
+    public void scale(double f) {
+        revalidate();
+        repaint();
+        dataSet.scale(f);
+    }
+
+    /**
+     * Fits the data to the visible area
+     *
+     * @param width the clients width
+     */
+    public void fitData(int width) {
+        dataSet.fitInside(width);
+        revalidate();
+        repaint();
+    }
 }
diff --git a/src/main/java/de/neemann/digital/gui/components/data/DataSetDialog.java b/src/main/java/de/neemann/digital/gui/components/data/DataSetDialog.java
index e3096b131..3cb3e3dbc 100644
--- a/src/main/java/de/neemann/digital/gui/components/data/DataSetDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/data/DataSetDialog.java
@@ -8,6 +8,7 @@ import de.neemann.digital.gui.SaveAsHelper;
 import de.neemann.digital.gui.components.OrderMerger;
 import de.neemann.digital.gui.sync.Sync;
 import de.neemann.digital.lang.Lang;
+import de.neemann.gui.IconCreator;
 import de.neemann.gui.MyFileChooser;
 import de.neemann.gui.ToolTipAction;
 
@@ -33,6 +34,10 @@ public class DataSetDialog extends JDialog implements ModelStateObserver {
     private DataSet dataSet;
     private DataSetObserver dataSetObserver;
 
+    private static final Icon ICON_EXPAND = IconCreator.create("View-zoom-fit.png");
+    private static final Icon ICON_ZOOM_IN = IconCreator.create("View-zoom-in.png");
+    private static final Icon ICON_ZOOM_OUT = IconCreator.create("View-zoom-out.png");
+
     /**
      * Creates a new instance
      *
@@ -64,6 +69,33 @@ public class DataSetDialog extends JDialog implements ModelStateObserver {
         scrollPane = new JScrollPane(dsc);
         getContentPane().add(scrollPane);
 
+        JToolBar toolBar = new JToolBar();
+        ToolTipAction maximize = new ToolTipAction(Lang.get("menu_maximize"), ICON_EXPAND) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                dsc.fitData(scrollPane.getWidth() - scrollPane.getInsets().left - scrollPane.getInsets().right);
+            }
+        }.setAccelerator("F1");
+        ToolTipAction zoomIn = new ToolTipAction(Lang.get("menu_zoomIn"), ICON_ZOOM_IN) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                dsc.scale(1.25f);
+            }
+        }.setAccelerator("control PLUS");
+        ToolTipAction zoomOut = new ToolTipAction(Lang.get("menu_zoomOut"), ICON_ZOOM_OUT) {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                dsc.scale(0.8f);
+            }
+        }.setAccelerator("control MINUS");
+
+        toolBar.add(zoomIn.createJButtonNoText());
+        toolBar.add(zoomOut.createJButtonNoText());
+        toolBar.add(maximize.createJButtonNoText());
+
+        getContentPane().add(toolBar, BorderLayout.NORTH);
+        pack();
+
         addWindowListener(new WindowAdapter() {
             @Override
             public void windowOpened(WindowEvent e) {
@@ -90,8 +122,14 @@ public class DataSetDialog extends JDialog implements ModelStateObserver {
                         .checkOverwrite(file -> dataSet.saveCSV(file));
             }
         }.setToolTip(Lang.get("menu_saveData_tt")).createJMenuItem());
-        setJMenuBar(bar);
 
+        JMenu view = new JMenu(Lang.get("menu_view"));
+        bar.add(view);
+        view.add(maximize.createJMenuItem());
+        view.add(zoomOut.createJMenuItem());
+        view.add(zoomIn.createJMenuItem());
+
+        setJMenuBar(bar);
         pack();
         setLocationRelativeTo(owner);
     }
@@ -112,8 +150,10 @@ public class DataSetDialog extends JDialog implements ModelStateObserver {
         SwingUtilities.invokeLater(() -> {
             dsc.revalidate();
             dsc.repaint();
-            JScrollBar bar = scrollPane.getHorizontalScrollBar();
-            bar.setValue(bar.getMaximum());
+            SwingUtilities.invokeLater(() -> {
+                JScrollBar bar = scrollPane.getHorizontalScrollBar();
+                bar.setValue(bar.getMaximum());
+            });
         });
     }
 }