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 669ce92fc..ef92865f2 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
@@ -13,6 +13,7 @@ import java.awt.*;
  */
 public class DataSetComponent extends JComponent {
     private final DataSet dataSet;
+    private JScrollPane scrollPane;
 
     /**
      * Creates a new dataSet
@@ -23,7 +24,7 @@ public class DataSetComponent extends JComponent {
         this.dataSet = dataSet;
         addMouseWheelListener(e -> {
             double f = Math.pow(0.9, e.getWheelRotation());
-            scale(f);  // ToDo keep relative mouse position
+            scale(f, e.getX());
         });
     }
 
@@ -46,12 +47,17 @@ public class DataSetComponent extends JComponent {
     /**
      * Apply a scaling factor
      *
-     * @param f the factor
+     * @param f    the factor
+     * @param xPos fixed position
      */
-    public void scale(double f) {
+    public void scale(double f, int xPos) {
         revalidate();
         repaint();
         dataSet.scale(f);
+
+        int x = (int) (xPos * f) - (xPos - (int) scrollPane.getViewport().getViewRect().getX());
+        if (x < 0) x = 0;
+        scrollPane.getViewport().setViewPosition(new Point(x, 0));
     }
 
     /**
@@ -64,4 +70,13 @@ public class DataSetComponent extends JComponent {
         revalidate();
         repaint();
     }
+
+    /**
+     * Sets the used scroll pane
+     *
+     * @param scrollPane the scroll pane witch contains this component
+     */
+    public void setScrollPane(JScrollPane scrollPane) {
+        this.scrollPane = scrollPane;
+    }
 }
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 3cb3e3dbc..27ea34ee9 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
@@ -68,6 +68,7 @@ public class DataSetDialog extends JDialog implements ModelStateObserver {
         dsc = new DataSetComponent(dataSet);
         scrollPane = new JScrollPane(dsc);
         getContentPane().add(scrollPane);
+        dsc.setScrollPane(scrollPane);
 
         JToolBar toolBar = new JToolBar();
         ToolTipAction maximize = new ToolTipAction(Lang.get("menu_maximize"), ICON_EXPAND) {
@@ -79,13 +80,15 @@ public class DataSetDialog extends JDialog implements ModelStateObserver {
         ToolTipAction zoomIn = new ToolTipAction(Lang.get("menu_zoomIn"), ICON_ZOOM_IN) {
             @Override
             public void actionPerformed(ActionEvent e) {
-                dsc.scale(1.25f);
+                Rectangle r = scrollPane.getViewport().getViewRect();
+                dsc.scale(1.25f, r.x + r.width / 2);
             }
         }.setAccelerator("control PLUS");
         ToolTipAction zoomOut = new ToolTipAction(Lang.get("menu_zoomOut"), ICON_ZOOM_OUT) {
             @Override
             public void actionPerformed(ActionEvent e) {
-                dsc.scale(0.8f);
+                Rectangle r = scrollPane.getViewport().getViewRect();
+                dsc.scale(0.8f, r.x + r.width / 2);
             }
         }.setAccelerator("control MINUS");