diff --git a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplay.java b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplay.java
index 21f3479..9c3f140 100644
--- a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplay.java
+++ b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplay.java
@@ -195,6 +195,14 @@ public class FourCornerUnicodeDisplay {
 				}
 				numberMode = cdc.next();
 				numberPIE = FCDotCDC1604DashP6.__PIE.ordinal() == cdcPoint; // is false for PIN
+				if (renderHiddenControls) {
+					if (numberPIE) {
+						buf.append(FCDotCDC1604DashP6.escapeSignUnicode(FCDotCDC1604DashP6.__PIE.ordinal()));
+					} else {
+						buf.append(FCDotCDC1604DashP6.escapeSignUnicode(FCDotCDC1604DashP6.__PIN.ordinal()));
+					}
+					buf.appendCodePoint(FCDotCDC1604DashP6.indexOf(numberMode).codePoints()[0]);
+				}
 				if (numberMode < FCDotCDC1604DashP6.NX01_A.ordinal()) {
 					cdcPoint = numberMode; // print char
 					numberMode = null; // illegal number mode
diff --git a/nx01-x4o-o2o/src/test/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplayTest.java b/nx01-x4o-o2o/src/test/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplayTest.java
index 1107adb..f1521da 100644
--- a/nx01-x4o-o2o/src/test/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplayTest.java
+++ b/nx01-x4o-o2o/src/test/java/org/x4o/o2o/fc18/FourCornerUnicodeDisplayTest.java
@@ -82,7 +82,7 @@ public class FourCornerUnicodeDisplayTest {
 		cdc.add(FCDotCDC1604DashP6.NX15_O);
 		
 		Assertions.assertEquals("ab B␃cD.jklmO", FourCornerUnicodeDisplay.text().renderFromX06(cdc));
-		Assertions.assertEquals("ab B␃cD.jklm␃␃O", FourCornerUnicodeDisplay.text(true).renderFromX06(cdc));
+		Assertions.assertEquals("␁Za␁Zb B␃cD.␁Zjklm␃␃O", FourCornerUnicodeDisplay.text(true).renderFromX06(cdc));
 	}
 	
 	@Test