diff --git a/src/main/java/de/neemann/digital/analyse/quinemc/ThreeStateValue.java b/src/main/java/de/neemann/digital/analyse/quinemc/ThreeStateValue.java
index 29826a094..b0d9fc4b3 100644
--- a/src/main/java/de/neemann/digital/analyse/quinemc/ThreeStateValue.java
+++ b/src/main/java/de/neemann/digital/analyse/quinemc/ThreeStateValue.java
@@ -58,4 +58,32 @@ public enum ThreeStateValue {
     public int asInt() {
         return ordinal();
     }
+
+    /**
+     * @return the inverted value; DC remains DC
+     */
+    public ThreeStateValue invert() {
+        switch (this) {
+            case zero:
+                return one;
+            case one:
+                return zero;
+            default:
+                return dontCare;
+        }
+    }
+
+    /**
+     * @return returns the value as a bool
+     */
+    public boolean bool() {
+        switch (this) {
+            case zero:
+                return false;
+            case one:
+                return true;
+            default:
+                throw new RuntimeException("don't care not allowed");
+        }
+    }
 }
diff --git a/src/test/java/de/neemann/digital/analyse/ModelAnalyserTest.java b/src/test/java/de/neemann/digital/analyse/ModelAnalyserTest.java
index 1df121e96..922586443 100644
--- a/src/test/java/de/neemann/digital/analyse/ModelAnalyserTest.java
+++ b/src/test/java/de/neemann/digital/analyse/ModelAnalyserTest.java
@@ -97,23 +97,33 @@ public class ModelAnalyserTest extends TestCase {
     public void testAnalyzerMultiBit() throws Exception {
         Model model = new ToBreakRunner("dig/analyze/multiBitCounter.dig", false).getModel();
         TruthTable tt = new ModelAnalyser(model).analyse();
-        assertEquals("Q0n+1",tt.getResultName(0));
+        assertEquals("Q0n+1", tt.getResultName(0));
         final BoolTable r0 = tt.getResult(0);
-        assertEquals(4,r0.size());
-        assertEquals(one,r0.get(0));
-        assertEquals(one,r0.get(1));
-        assertEquals(zero,r0.get(2));
-        assertEquals(zero,r0.get(3));
+        assertEquals(4, r0.size());
+        assertEquals(one, r0.get(0));
+        assertEquals(one, r0.get(1));
+        assertEquals(zero, r0.get(2));
+        assertEquals(zero, r0.get(3));
 
-        assertEquals("Q1n+1",tt.getResultName(1));
+        assertEquals("Q1n+1", tt.getResultName(1));
         final BoolTable r1 = tt.getResult(1);
-        assertEquals(4,r1.size());
-        assertEquals(zero,r1.get(0));
-        assertEquals(one,r1.get(1));
-        assertEquals(one,r1.get(2));
-        assertEquals(zero,r1.get(3));
+        assertEquals(4, r1.size());
+        assertEquals(zero, r1.get(0));
+        assertEquals(one, r1.get(1));
+        assertEquals(one, r1.get(2));
+        assertEquals(zero, r1.get(3));
+
+        assertEquals("Y0", tt.getResultName(2));
+        assertEquals("Y1", tt.getResultName(3));
+        final BoolTable y0 = tt.getResult(2);
+        final BoolTable y1 = tt.getResult(3);
+        for (int i = 0; i < 4; i++) {
+            assertEquals((i & 2) > 0, y0.get(i).invert().bool());
+            assertEquals((i & 1) > 0, y1.get(i).invert().bool());
+        }
     }
 
+
     public void testAnalyzerMultiBit2() throws Exception {
         Model model = new ToBreakRunner("dig/analyze/multiBitInOut.dig", false).getModel();
         TruthTable tt = new ModelAnalyser(model).analyse();
@@ -128,21 +138,21 @@ public class ModelAnalyserTest extends TestCase {
     }
 
     private void checkIdent(TruthTable tt) {
-        assertEquals("B0",tt.getResultName(0));
+        assertEquals("B0", tt.getResultName(0));
         final BoolTable r0 = tt.getResult(0);
-        assertEquals(4,r0.size());
-        assertEquals(zero,r0.get(0));
-        assertEquals(zero,r0.get(1));
-        assertEquals(one,r0.get(2));
-        assertEquals(one,r0.get(3));
+        assertEquals(4, r0.size());
+        assertEquals(zero, r0.get(0));
+        assertEquals(zero, r0.get(1));
+        assertEquals(one, r0.get(2));
+        assertEquals(one, r0.get(3));
 
-        assertEquals("B1",tt.getResultName(1));
+        assertEquals("B1", tt.getResultName(1));
         final BoolTable r1 = tt.getResult(1);
-        assertEquals(4,r1.size());
-        assertEquals(zero,r1.get(0));
-        assertEquals(one,r1.get(1));
-        assertEquals(zero,r1.get(2));
-        assertEquals(one,r1.get(3));
+        assertEquals(4, r1.size());
+        assertEquals(zero, r1.get(0));
+        assertEquals(one, r1.get(1));
+        assertEquals(zero, r1.get(2));
+        assertEquals(one, r1.get(3));
     }
 
 }
\ No newline at end of file
diff --git a/src/test/resources/dig/analyze/multiBitCounter.dig b/src/test/resources/dig/analyze/multiBitCounter.dig
index 2eadcb01f..8076f3432 100644
--- a/src/test/resources/dig/analyze/multiBitCounter.dig
+++ b/src/test/resources/dig/analyze/multiBitCounter.dig
@@ -56,6 +56,20 @@
       </elementAttributes>
       <pos x="400" y="280"/>
     </visualElement>
+    <visualElement>
+      <elementName>Out</elementName>
+      <elementAttributes>
+        <entry>
+          <string>Label</string>
+          <string>Y</string>
+        </entry>
+        <entry>
+          <string>Bits</string>
+          <int>2</int>
+        </entry>
+      </elementAttributes>
+      <pos x="600" y="200"/>
+    </visualElement>
   </visualElements>
   <wires>
     <wire>
@@ -82,6 +96,10 @@
       <p1 x="480" y="200"/>
       <p2 x="500" y="200"/>
     </wire>
+    <wire>
+      <p1 x="560" y="200"/>
+      <p2 x="600" y="200"/>
+    </wire>
     <wire>
       <p1 x="380" y="220"/>
       <p2 x="400" y="220"/>