diff --git a/src/main/java/de/neemann/digital/core/Model.java b/src/main/java/de/neemann/digital/core/Model.java
index 82f321340..22a035656 100644
--- a/src/main/java/de/neemann/digital/core/Model.java
+++ b/src/main/java/de/neemann/digital/core/Model.java
@@ -131,6 +131,13 @@ public class Model implements Iterable<Node>, SyncAccess {
         return windowPosManager;
     }
 
+    /**
+     * @return true if this model runs in the main frame
+     */
+    public boolean runningInMainFrame() {
+        return getWindowPosManager().getMainFrame() != null;
+    }
+
     /**
      * Returns the actual step counter.
      * This counter is incremented by every micro step
diff --git a/src/main/java/de/neemann/digital/gui/components/terminal/Terminal.java b/src/main/java/de/neemann/digital/gui/components/terminal/Terminal.java
index 7878736b9..a24ba2cdc 100644
--- a/src/main/java/de/neemann/digital/gui/components/terminal/Terminal.java
+++ b/src/main/java/de/neemann/digital/gui/components/terminal/Terminal.java
@@ -22,7 +22,6 @@ import static de.neemann.digital.core.element.PinInfo.input;
  * Component which represents a text terminal.
  */
 public class Terminal extends Node implements Element {
-    private static final boolean HIDE_DIALOG = GraphicsEnvironment.isHeadless() || System.getProperty("testdata") != null;
 
     /**
      * The terminal description
@@ -72,10 +71,10 @@ public class Terminal extends Node implements Element {
             long value = data.getValue();
             if (value != 0) {
                 if (terminal == null) {
-                    if (HIDE_DIALOG) {
-                        terminal = new ConsoleTerminal();
-                    } else {
+                    if (getModel().runningInMainFrame()) {
                         terminal = TerminalDialog.getTerminal(getModel(), attr);
+                    } else {
+                        terminal = new ConsoleTerminal();
                     }
                 }
                 terminal.addChar((char) value);
@@ -89,9 +88,9 @@ public class Terminal extends Node implements Element {
     }
 
     /**
-     * @return the terminal dialog
+     * @return the terminal interface
      */
-    public TerminalInterface getTerminalDialog() {
+    public TerminalInterface getTerminalInterface() {
         return terminal;
     }
 }
diff --git a/src/test/java/de/neemann/digital/integration/TestInGUI.java b/src/test/java/de/neemann/digital/integration/TestInGUI.java
index 3d4d87dae..2f04145cb 100644
--- a/src/test/java/de/neemann/digital/integration/TestInGUI.java
+++ b/src/test/java/de/neemann/digital/integration/TestInGUI.java
@@ -530,7 +530,7 @@ public class TestInGUI extends TestCase {
                             List<Terminal> n = main.getModel().findNode(Terminal.class);
                             assertEquals(1, n.size());
                             Terminal t = n.get(0);
-                            assertEquals("\nHello World!", t.getTerminalDialog().getText());
+                            assertEquals("\nHello World!", t.getTerminalInterface().getText());
                         }))
                 .execute();
     }