diff --git a/src/main/java/de/neemann/digital/core/IntFormat.java b/src/main/java/de/neemann/digital/core/IntFormat.java
index cfdeed5d0..f5a16f769 100644
--- a/src/main/java/de/neemann/digital/core/IntFormat.java
+++ b/src/main/java/de/neemann/digital/core/IntFormat.java
@@ -478,6 +478,11 @@ public enum IntFormat {
         public boolean isSuitedForAddresses() {
             return false;
         }
+
+        @Override
+        public boolean isProportional() {
+            return false;
+        }
     }
 
 }
diff --git a/src/main/java/de/neemann/digital/core/ValueFormatter.java b/src/main/java/de/neemann/digital/core/ValueFormatter.java
index 12a3f9293..2ec904c49 100644
--- a/src/main/java/de/neemann/digital/core/ValueFormatter.java
+++ b/src/main/java/de/neemann/digital/core/ValueFormatter.java
@@ -44,4 +44,14 @@ public interface ValueFormatter {
      * @return true if formatter is suited to display addresses
      */
     boolean isSuitedForAddresses();
+
+    /**
+     * If the represented value is proportional to the underlying integer value.
+     * This is not the case at float values.
+     *
+     * @return true if represented valueis proportional to the underlying integer value
+     */
+    default boolean isProportional() {
+        return true;
+    }
 }
diff --git a/src/main/java/de/neemann/digital/draw/shapes/InputShape.java b/src/main/java/de/neemann/digital/draw/shapes/InputShape.java
index af3453c26..bb9fa2a8e 100644
--- a/src/main/java/de/neemann/digital/draw/shapes/InputShape.java
+++ b/src/main/java/de/neemann/digital/draw/shapes/InputShape.java
@@ -183,7 +183,7 @@ public class InputShape implements Shape {
         @Override
         public void dragged(CircuitComponent cc, Point posOnScreen, Vector pos, Transform transform, IOState ioState, Element element, SyncAccess modelSync) {
             ObservableValue value = ioState.getOutput(0);
-            if (bits > 1 && !value.isHighZ()) {
+            if (bits > 1 && !value.isHighZ() && formatter.isProportional()) {
                 if (!isDrag) {
                     isDrag = true;
                     startPos = posOnScreen;