diff --git a/x26dockwidget.cpp b/x26dockwidget.cpp
index 7453ba5..3e67f33 100644
--- a/x26dockwidget.cpp
+++ b/x26dockwidget.cpp
@@ -316,12 +316,12 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	// Index 6 - DRCS mode
 	QHBoxLayout *DRCSModeLayout = new QHBoxLayout;
 
-	m_DRCSModeRequiredAtL2p5CheckBox = new QCheckBox("L2.5");
-	m_DRCSModeRequiredAtL3p5CheckBox = new QCheckBox("L3.5");
-	DRCSModeLayout->addWidget(m_DRCSModeRequiredAtL2p5CheckBox);
-	DRCSModeLayout->addWidget(m_DRCSModeRequiredAtL3p5CheckBox);
-	connect(m_DRCSModeRequiredAtL2p5CheckBox, &QCheckBox::stateChanged, this, [=](const int value) {  updateModelFromCookedWidget(value, Qt::UserRole+1); } );
-	connect(m_DRCSModeRequiredAtL3p5CheckBox, &QCheckBox::stateChanged, this, [=](const int value) {  updateModelFromCookedWidget(value, Qt::UserRole+2); } );
+	m_DRCSModeRequiredAtLevelsComboBox = new QComboBox;
+	m_DRCSModeRequiredAtLevelsComboBox->addItem("L2.5 only");
+	m_DRCSModeRequiredAtLevelsComboBox->addItem("L3.5 only");
+	m_DRCSModeRequiredAtLevelsComboBox->addItem("L2.5 + 3.5");
+	DRCSModeLayout->addWidget(m_DRCSModeRequiredAtLevelsComboBox);
+	connect(m_DRCSModeRequiredAtLevelsComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](const int value) {  updateModelFromCookedWidget(value, Qt::UserRole+1); } );
 	m_DRCSModeGlobalRadioButton = new QRadioButton("Global");
 	m_DRCSModeNormalRadioButton = new QRadioButton("Normal");
 	QButtonGroup *DRCSModeButtonGroup = new QButtonGroup;
@@ -788,18 +788,15 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 			m_tripletParameterStackedLayout->setCurrentIndex(5);
 			break;
 		case 0x18: // DRCS mode
-			m_DRCSModeRequiredAtL2p5CheckBox->blockSignals(true);
-			m_DRCSModeRequiredAtL3p5CheckBox->blockSignals(true);
+			m_DRCSModeRequiredAtLevelsComboBox->blockSignals(true);
 			m_DRCSModeGlobalRadioButton->blockSignals(true);
 			m_DRCSModeNormalRadioButton->blockSignals(true);
 			m_DRCSModeSubPageSpinBox->blockSignals(true);
-			m_DRCSModeRequiredAtL2p5CheckBox->setChecked(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toBool());
-			m_DRCSModeRequiredAtL3p5CheckBox->setChecked(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+2).toBool());
+			m_DRCSModeRequiredAtLevelsComboBox->setCurrentIndex(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt());
 			m_DRCSModeGlobalRadioButton->setChecked(!index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+3).toBool());
 			m_DRCSModeNormalRadioButton->setChecked(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+3).toBool());
 			m_DRCSModeSubPageSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+4).toInt());
-			m_DRCSModeRequiredAtL2p5CheckBox->blockSignals(false);
-			m_DRCSModeRequiredAtL3p5CheckBox->blockSignals(false);
+			m_DRCSModeRequiredAtLevelsComboBox->blockSignals(false);
 			m_DRCSModeGlobalRadioButton->blockSignals(false);
 			m_DRCSModeNormalRadioButton->blockSignals(false);
 			m_DRCSModeSubPageSpinBox->blockSignals(false);
diff --git a/x26dockwidget.h b/x26dockwidget.h
index 482aadf..674349f 100644
--- a/x26dockwidget.h
+++ b/x26dockwidget.h
@@ -83,7 +83,7 @@ private:
 	QSpinBox *m_invokePOPSubPageSpinBox, *m_invokePOPPacketNumberSpinBox;
 	QComboBox *m_invokePOPTripletNumberComboBox, *m_invokePOPPointerBitsComboBox;
 	QStackedLayout *m_invokeObjectSourceStackedLayout, *m_tripletParameterStackedLayout;
-	QCheckBox *m_DRCSModeRequiredAtL2p5CheckBox, *m_DRCSModeRequiredAtL3p5CheckBox;
+	QComboBox *m_DRCSModeRequiredAtLevelsComboBox;
 	QRadioButton *m_DRCSModeGlobalRadioButton, *m_DRCSModeNormalRadioButton;
 	QSpinBox *m_DRCSModeSubPageSpinBox;
 	QRadioButton *m_DRCSCharacterGlobalRadioButton, *m_DRCSCharacterNormalRadioButton;
diff --git a/x26model.cpp b/x26model.cpp
index 3b6ba7d..7063785 100644
--- a/x26model.cpp
+++ b/x26model.cpp
@@ -164,9 +164,9 @@ QVariant X26Model::data(const QModelIndex &index, int role) const
 					case 0x30:
 						result.append("L2.5 and 3.5");
 						break;
-					//case 0x00:
-					//	result = "Reserved";
-					//	break;
+					case 0x00:
+						result.append("Reserved");
+						break;
 				}
 				return result;
 			case 0x1f: // Termination
@@ -336,8 +336,8 @@ QVariant X26Model::data(const QModelIndex &index, int role) const
 					// Required at which levels
 					return ((m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).address() & 0x18) >> 3) - 1;
 				case 0x18: // DRCS mode
-					// Required at level 2.5
-					return (m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).data() & 0x10) == 0x10;
+					// Required at which levels
+					return ((m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).data() & 0x30) >> 4) - 1;
 				case 0x1f: // Termination
 					// Intermed POP subpage|Last POP subpage|Local Object|Local enhance
 					return ((m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).data() & 0x06) >> 1);
@@ -375,9 +375,6 @@ QVariant X26Model::data(const QModelIndex &index, int role) const
 				case 0x15 ... 0x17: // Define object
 					// Local object: Designation code
 					return ((m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).address() & 0x01) << 3) | ((m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).data() & 0x70) >> 4);
-				case 0x18: // DRCS mode
-					// Required at level 3.5
-					return (m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).data() & 0x20) == 0x20;
 				case 0x1f: // Termination
 					// More follows/Last
 					return (m_parentMainWidget->document()->currentSubPage()->enhancements()->at(index.row()).data() & 0x01) == 0x01;
@@ -629,8 +626,8 @@ bool X26Model::setData(const QModelIndex &index, const QVariant &value, int role
 					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETaddress, 0x27, (value.toInt()+1) << 3, role));
 					break;
 				case 0x18: // DRCS Mode
-					// Required at level 2.5
-					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETdata, 0x6f, value.toInt() << 3, role));
+					// Required at which levels
+					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETdata, 0x4f, (value.toInt()+1) << 4, role));
 					break;
 				case 0x1f: // Termination
 					// Intermed POP subpage|Last POP subpage|Local Object|Local enhance
@@ -679,10 +676,6 @@ bool X26Model::setData(const QModelIndex &index, const QVariant &value, int role
 					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETdata, 0x0f, (value.toInt() & 0x07) << 4, role));
 					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETaddress, 0x38, value.toInt() >> 3, role));
 					break;
-				case 0x18: // DRCS Mode
-					// Required at level 3.5
-					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETdata, 0x5f, value.toInt() << 4, role));
-					break;
 				case 0x1f: // Termination
 					// More follows/Last
 					m_parentMainWidget->document()->undoStack()->push(new EditTripletCommand(m_parentMainWidget->document(), this, index.row(), EditTripletCommand::ETdata, 0x06, value.toInt(), role));