diff --git a/src/main/java/de/neemann/digital/core/IntFormat.java b/src/main/java/de/neemann/digital/core/IntFormat.java
index 698220ed0..ffa09e5b1 100644
--- a/src/main/java/de/neemann/digital/core/IntFormat.java
+++ b/src/main/java/de/neemann/digital/core/IntFormat.java
@@ -29,6 +29,10 @@ public enum IntFormat {
      * binary
      */
     bin,
+    /**
+     * octal
+     */
+    oct,
     /**
      * ascii format
      */
@@ -73,6 +77,8 @@ public enum IntFormat {
                 return "0x" + toHex(inValue);
             case bin:
                 return "0b" + toBin(inValue);
+            case oct:
+                return "0" + toOct(inValue);
             case ascii:
                 return "'" + (char) inValue.getValue() + "'";
             default:
@@ -100,6 +106,19 @@ public enum IntFormat {
         return sb.toString();
     }
 
+    private static String toOct(Value inValue) {
+        final int bits = inValue.getBits();
+        final int numChars = (bits - 1) / 3 + 1;
+
+        StringBuilder sb = new StringBuilder(numChars);
+        final long value = inValue.getValue();
+        for (int i = numChars - 1; i >= 0; i--) {
+            int c = (int) ((value >> (i * 3)) & 0x7);
+            sb.append(DIGITS[c]);
+        }
+        return sb.toString();
+    }
+
 
     /**
      * Creates a short hex representation of the given value.
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index d581e95be..4c55c1caa 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -1117,6 +1117,7 @@ Sind evtl. die Namen der Variablen nicht eindeutig?</string>
     <string name="key_intFormat_decSigned">Dezimal mit Vorzeichen</string>
     <string name="key_intFormat_def">Vorgabe</string>
     <string name="key_intFormat_hex">Hexadezimal</string>
+    <string name="key_intFormat_oct">Oktal</string>
     <string name="key_barrelSigned">Verschiebeweite hat Vorzeichen</string><!-- BarrelShifter -->
     <string name="key_barrelSigned_tt">Verschiebeweite verwendet Zweierkomplement</string>
     <string name="key_barrelShifterMode">Modus</string><!-- BarrelShifter -->
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index 597940bbc..45c64cbb9 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -1106,6 +1106,7 @@
     <string name="key_intFormat_decSigned">signed decimal</string>
     <string name="key_intFormat_def">default</string>
     <string name="key_intFormat_hex">hex</string>
+    <string name="key_intFormat_oct">octal</string>
     <string name="key_barrelSigned">shift input has sign</string><!-- BarrelShifter -->
     <string name="key_barrelSigned_tt">shift input data has two complement format</string>
     <string name="key_barrelShifterMode">Mode</string><!-- BarrelShifter -->