diff --git a/src/sliderulesmodels.cpp b/src/sliderulesmodels.cpp
index 23f774d3..1072446b 100644
--- a/src/sliderulesmodels.cpp
+++ b/src/sliderulesmodels.cpp
@@ -7,27 +7,6 @@ namespace Ripes {
 ISAEncodingTableModel::ISAEncodingTableModel(QObject *parent)
     : QAbstractTableModel(parent) {}
 
-void ISAEncodingTableModel::setFamily(ISAFamily family) {
-  if (!m_isaInfo || m_isaInfo->isaFamily() != family) {
-    m_isaInfo = ISAInfoRegistry::getISA(*ISAFamilySets.at(family).begin(),
-                                        QStringList());
-    emit familyChanged(family);
-  }
-}
-
-void ISAEncodingTableModel::setISA(ISA isa) {
-  if (!m_isaInfo || m_isaInfo->isaID() != isa) {
-    auto extensions = QStringList();
-    // NOTE: This assumes that all ISAs within a single family have the same
-    // supported extensions. Change this logic if that statement is not true.
-    if (m_isaInfo && m_isaInfo->isaFamily() == ISAFamilies.at(isa)) {
-      extensions = m_isaInfo->enabledExtensions();
-    }
-    m_isaInfo = ISAInfoRegistry::getISA(isa, extensions);
-    emit isaChanged(isa);
-  }
-}
-
 int ISAEncodingTableModel::rowCount(const QModelIndex &) const { return 1; }
 
 int ISAEncodingTableModel::columnCount(const QModelIndex &) const { return 1; }
@@ -44,4 +23,23 @@ QVariant ISAEncodingTableModel::data(const QModelIndex &index, int role) const {
   return QVariant();
 }
 
+void ISAEncodingTableModel::setISAInfo(
+    std::shared_ptr<const ISAInfoBase> isaInfo) {
+  bool initialize = m_isaInfo == nullptr;
+  m_prevIsaInfo = initialize ? isaInfo : m_isaInfo;
+  m_isaInfo = isaInfo;
+  if (initialize) {
+    emit isaInfoInitialized(*m_isaInfo.get());
+  } else {
+    emit isaInfoChanged(*m_isaInfo.get(), *m_prevIsaInfo.get());
+  }
+}
+
+void ISAEncodingTableModel::setISAFamily(ISAFamily isaFamily) {
+  if (m_isaInfo->isaFamily() != isaFamily) {
+    setISAInfo(ISAInfoRegistry::getISA(*ISAFamilySets.at(isaFamily).begin(),
+                                       QStringList()));
+  }
+}
+
 } // namespace Ripes
diff --git a/src/sliderulesmodels.h b/src/sliderulesmodels.h
index c772782b..4d1e934d 100644
--- a/src/sliderulesmodels.h
+++ b/src/sliderulesmodels.h
@@ -36,23 +36,17 @@ class ISAEncodingTableModel : public QAbstractTableModel {
   //                              int role = Qt::DisplayRole) const override;
 
 public slots:
-  /// Updates the Model and emits `familyChanged()` signal if the model's ISA
-  /// family has changed.
-  ///
-  /// This should only be `connect()`ed to UI signals whose function names end
-  /// in `Activated`. Can also be `connect()`ed to
-  /// `ProcessorHandler::processorChanged()`.
-  void setFamily(ISAFamily family);
-  void setISA(ISA isa);
+  void setISAInfo(std::shared_ptr<const ISAInfoBase> isaInfo);
+  void setISAFamily(ISAFamily isaFamily);
 
 signals:
-  /// Called when the ISA family of the model changes. Use this to update UI.
-  void familyChanged(ISAFamily family);
-  /// Called when the ISA of the model changes. Use this to update UI.
-  void isaChanged(ISA isa);
+  void isaInfoInitialized(const ISAInfoBase &isaInfo);
+  void isaInfoChanged(const ISAInfoBase &isaInfo,
+                      const ISAInfoBase &prevISAInfo);
 
 protected:
   std::shared_ptr<const ISAInfoBase> m_isaInfo = nullptr;
+  std::shared_ptr<const ISAInfoBase> m_prevIsaInfo = nullptr;
 };
 
 } // namespace Ripes
diff --git a/src/sliderulestab.cpp b/src/sliderulestab.cpp
index d5d6cca0..2ca1cf96 100644
--- a/src/sliderulestab.cpp
+++ b/src/sliderulestab.cpp
@@ -6,95 +6,131 @@
 
 namespace Ripes {
 
-ISAFamilyComboBox::ISAFamilyComboBox(QWidget *parent) : QComboBox(parent) {
-  for (const auto &p : ISAFamilyNames) {
-    addItem(p.second, QVariant::fromValue(p.first));
+ISAEncodingFilters::ISAEncodingFilters(QWidget *parent) : QFrame(parent) {
+  setLayout(new QHBoxLayout(this));
+
+  auto *isaFamilyFilter = new QFrame(this);
+  isaFamilyFilter->setLayout(new QVBoxLayout(isaFamilyFilter));
+  isaFamilyFilter->layout()->addWidget(new QLabel("ISA Family"));
+  isaFamilyBox = new QComboBox();
+  for (const auto &familyName : ISAFamilyNames) {
+    isaFamilyBox->addItem(familyName.second,
+                          QVariant(static_cast<int>(familyName.first)));
   }
+  isaFamilyFilter->layout()->addWidget(isaFamilyBox);
+  layout()->addWidget(isaFamilyFilter);
+  connect(isaFamilyBox, &QComboBox::activated, this, [=] {
+    emit isaFamilyChanged(
+        static_cast<ISAFamily>(isaFamilyBox->currentData().toInt()));
+  });
+
+  auto *isaFilter = new QFrame(this);
+  isaFilter->setLayout(new QVBoxLayout(isaFilter));
+  isaFilter->layout()->addWidget(new QLabel("ISA"));
+  isaBox = new QComboBox();
+  isaFilter->layout()->addWidget(isaBox);
+  layout()->addWidget(isaFilter);
+
+  auto *mainExtFilter = new QFrame(this);
+  mainExtFilter->setLayout(new QVBoxLayout(mainExtFilter));
+  mainExtFilter->layout()->addWidget(new QLabel("Main Extension"));
+  mainExtBox = new QComboBox();
+  mainExtFilter->layout()->addWidget(mainExtBox);
+  layout()->addWidget(mainExtFilter);
 }
 
-void ISAFamilyComboBox::setFamily(ISAFamily family) {
-  setCurrentIndex(findData(QVariant::fromValue(family)));
-  emit familyChanged(family);
+void ISAEncodingFilters::initializeView(const ISAInfoBase &isaInfo) {
+  isaBox->clear();
+  for (const auto &isa : ISAFamilySets.at(isaInfo.isaFamily())) {
+    isaBox->addItem(ISANames.at(isa), QVariant(static_cast<int>(isa)));
+  }
+  isaBox->setCurrentIndex(
+      isaBox->findData(QVariant(static_cast<int>(isaInfo.isaID()))));
+
+  mainExtBox->clear();
+  for (const auto &ext :
+       QStringList(isaInfo.baseExtension()) + isaInfo.supportedExtensions()) {
+    mainExtBox->addItem(ext, ext);
+  }
 }
 
-ISAComboBox::ISAComboBox(QWidget *parent) : QComboBox(parent) {}
+void ISAEncodingFilters::updateView(const ISAInfoBase &isaInfo,
+                                    const ISAInfoBase &prevISAInfo) {
+  if (isaInfo.isaFamily() != prevISAInfo.isaFamily()) {
+    isaFamilyBox->setCurrentIndex(isaFamilyBox->findData(
+        QVariant(static_cast<int>(isaInfo.isaFamily()))));
 
-void ISAComboBox::setFamily(ISAFamily family) {
-  ISA prevISA = currentData().value<ISA>();
-  clear();
-  for (const auto isa : ISAFamilySets.at(family)) {
-    addItem(ISANames.at(isa), QVariant::fromValue(isa));
+    isaBox->clear();
+    for (const auto &isa : ISAFamilySets.at(isaInfo.isaFamily())) {
+      isaBox->addItem(ISANames.at(isa), QVariant(static_cast<int>(isa)));
+    }
   }
-  ISA isa = currentData().value<ISA>();
-  if (prevISA != isa) {
-    emit isaChanged(isa);
+
+  if (isaInfo.isaID() != prevISAInfo.isaID()) {
+    isaBox->setCurrentIndex(
+        isaBox->findData(QVariant(static_cast<int>(isaInfo.isaID()))));
   }
-}
 
-void ISAComboBox::setISA(ISA isa) {
-  setCurrentIndex(findData(QVariant::fromValue(isa)));
-  emit isaChanged(isa);
+  mainExtBox->clear();
+  for (const auto &ext :
+       QStringList(isaInfo.baseExtension()) + isaInfo.supportedExtensions()) {
+    mainExtBox->addItem(ext, ext);
+  }
 }
 
 ISAEncodingTableView::ISAEncodingTableView(QWidget *parent)
     : QTableView(parent) {}
 
-void ISAEncodingTableView::setFamily(ISAFamily family) {
-  emit familyChanged(family);
-}
+void ISAEncodingTableView::updateView(const ISAInfoBase &isaInfo,
+                                      const ISAInfoBase &prevISAInfo) {}
+
+void ISAEncodingTableView::initializeView(const ISAInfoBase &isaInfo) {}
 
 SliderulesTab::SliderulesTab(QToolBar *toolbar, QWidget *parent)
     : RipesTab(toolbar, parent), ui(new Ui::SliderulesTab) {
   ui->setupUi(this);
 
-  // Set initial model
   m_encodingModel = std::make_unique<ISAEncodingTableModel>();
-  ui->encodingTable->setModel(m_encodingModel.get());
-
-  // Helper signals
-  connect(ui->isaFamilySelector, &QComboBox::activated, ui->isaFamilySelector,
-          [=](int index) {
-            emit ui->isaFamilySelector->familyActivated(
-                static_cast<ISAFamily>(index));
-          });
-  connect(ui->isaSelector, &QComboBox::activated, ui->isaSelector,
-          [=](int index) {
-            emit ui->isaSelector->isaActivated(static_cast<ISA>(index));
-          });
-
-  // UI -> Model signals
-  connect(ui->isaFamilySelector, &ISAFamilyComboBox::familyActivated,
-          m_encodingModel.get(), &ISAEncodingTableModel::setFamily);
-  connect(ui->isaSelector, &ISAComboBox::isaActivated, m_encodingModel.get(),
-          &ISAEncodingTableModel::setISA);
-
-  // Model -> UI signals
-  connect(m_encodingModel.get(), &ISAEncodingTableModel::familyChanged,
-          ui->encodingTable, &ISAEncodingTableView::setFamily);
-  connect(m_encodingModel.get(), &ISAEncodingTableModel::familyChanged,
-          ui->isaFamilySelector, &ISAFamilyComboBox::setFamily);
-  connect(m_encodingModel.get(), &ISAEncodingTableModel::familyChanged,
-          ui->isaSelector, &ISAComboBox::setFamily);
-  connect(m_encodingModel.get(), &ISAEncodingTableModel::isaChanged,
-          ui->isaSelector, &ISAComboBox::setISA);
-
-  // Model data changed
-  connect(m_encodingModel.get(), &ISAEncodingTableModel::familyChanged,
-          m_encodingModel.get(),
-          [=] { emit m_encodingModel->layoutChanged(); });
-  connect(m_encodingModel.get(), &ISAEncodingTableModel::isaChanged,
-          m_encodingModel.get(),
-          [=] { emit m_encodingModel->layoutChanged(); });
-
-  // Processor changed signal
+  auto setISAFromProcessor = [=] {
+    const auto *currentISA = ProcessorHandler::currentISA();
+    auto isaInfo = ISAInfoRegistry::getISA(currentISA->isaID(),
+                                           currentISA->enabledExtensions());
+    m_encodingModel->setISAInfo(isaInfo);
+  };
+
+  // Initialize the views when the model is initialized
+  connect(m_encodingModel.get(), &ISAEncodingTableModel::isaInfoInitialized,
+          this, &SliderulesTab::initializeView);
+
+  // Update the views when the model changes
+  connect(m_encodingModel.get(), &ISAEncodingTableModel::isaInfoChanged, this,
+          &SliderulesTab::updateView);
+
+  // Update the model when the processor is changed
   connect(ProcessorHandler::get(), &ProcessorHandler::processorChanged,
-          m_encodingModel.get(), [=] {
-            m_encodingModel->setFamily(
-                ProcessorHandler::currentISA()->isaFamily());
-          });
+          m_encodingModel.get(), setISAFromProcessor);
+
+  // Update the model when the user changes the filters
+  connect(ui->encodingFilters, &ISAEncodingFilters::isaFamilyChanged,
+          m_encodingModel.get(), &ISAEncodingTableModel::setISAFamily);
+
+  // Initialize model
+  setISAFromProcessor();
 
-  m_encodingModel->setFamily(ProcessorHandler::currentISA()->isaFamily());
+  ui->encodingTable->setModel(m_encodingModel.get());
 }
 
 SliderulesTab::~SliderulesTab() { delete ui; }
+
+void SliderulesTab::initializeView(const ISAInfoBase &isaInfo) {
+  ui->encodingFilters->initializeView(isaInfo);
+  ui->encodingTable->initializeView(isaInfo);
+}
+
+void SliderulesTab::updateView(const ISAInfoBase &isaInfo,
+                               const ISAInfoBase &prevISAInfo) {
+  ui->encodingFilters->updateView(isaInfo, prevISAInfo);
+  ui->encodingTable->updateView(isaInfo, prevISAInfo);
+}
+
 } // namespace Ripes
diff --git a/src/sliderulestab.h b/src/sliderulestab.h
index 8a7fcf3c..bd1bcbaf 100644
--- a/src/sliderulestab.h
+++ b/src/sliderulestab.h
@@ -18,44 +18,21 @@ namespace Ui {
 class SliderulesTab;
 }
 
-class ISAFamilyComboBox : public QComboBox {
+class ISAEncodingFilters : public QFrame {
   Q_OBJECT
 public:
-  ISAFamilyComboBox(QWidget *parent = nullptr);
+  ISAEncodingFilters(QWidget *parent = nullptr);
 
-  ISAFamily currentFamily() const { return currentData().value<ISAFamily>(); }
-
-public slots:
-  /// Updates the UI and emits `familyChanged()` signal.
-  void setFamily(ISAFamily family);
+  QComboBox *isaFamilyBox;
+  QComboBox *isaBox;
+  QComboBox *mainExtBox;
 
 signals:
-  /// Called when the family is changed in the UI directly by the user.
-  void familyActivated(ISAFamily family);
-  /// Called when any time the family is changed, including during
-  /// `setFamily()`.
-  void familyChanged(ISAFamily family);
-};
-
-class ISAComboBox : public QComboBox {
-  Q_OBJECT
-public:
-  ISAComboBox(QWidget *parent = nullptr);
-
-  ISA currentISA() const { return currentData().value<ISA>(); }
+  void isaFamilyChanged(ISAFamily isaFamily);
 
 public slots:
-  /// Updates the UI and emits `isaChanged()` signal.
-  void setISA(ISA isa);
-  /// Updates the UI using the new family and emits `isaChanged()` signal.
-  void setFamily(ISAFamily family);
-
-signals:
-  /// Called when the isa is changed in the UI directly by the user.
-  void isaActivated(ISA isa);
-  /// Called when any time the isa is changed, including during
-  /// `setFamily()`.
-  void isaChanged(ISA isa);
+  void initializeView(const ISAInfoBase &isaInfo);
+  void updateView(const ISAInfoBase &isaInfo, const ISAInfoBase &prevISAInfo);
 };
 
 class ISAEncodingTableView : public QTableView {
@@ -64,13 +41,8 @@ class ISAEncodingTableView : public QTableView {
   ISAEncodingTableView(QWidget *parent = nullptr);
 
 public slots:
-  /// Updates the UI and emits `familyChanged()` signal.
-  void setFamily(ISAFamily family);
-  //  void setISA(ISA isa);
-  //  void setExtension(QString ext, bool enabled);
-
-signals:
-  void familyChanged(ISAFamily family);
+  void initializeView(const ISAInfoBase &isaInfo);
+  void updateView(const ISAInfoBase &isaInfo, const ISAInfoBase &prevISAInfo);
 };
 
 class SliderulesTab : public RipesTab {
@@ -79,6 +51,10 @@ class SliderulesTab : public RipesTab {
   explicit SliderulesTab(QToolBar *toolbar, QWidget *parent = nullptr);
   ~SliderulesTab();
 
+public slots:
+  void initializeView(const ISAInfoBase &isaInfo);
+  void updateView(const ISAInfoBase &isaInfo, const ISAInfoBase &prevISAInfo);
+
 private:
   Ui::SliderulesTab *ui;
   std::unique_ptr<ISAEncodingTableModel> m_encodingModel = nullptr;
diff --git a/src/sliderulestab.ui b/src/sliderulestab.ui
index f37f7443..38d4b5cf 100644
--- a/src/sliderulestab.ui
+++ b/src/sliderulestab.ui
@@ -38,7 +38,7 @@
         </widget>
        </item>
        <item>
-        <widget class="QFrame" name="frame">
+        <widget class="ISAEncodingFilters" name="encodingFilters">
          <property name="sizePolicy">
           <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
            <horstretch>0</horstretch>
@@ -51,90 +51,7 @@
          <property name="frameShadow">
           <enum>QFrame::Raised</enum>
          </property>
-         <layout class="QHBoxLayout" name="horizontalLayout_3">
-          <item>
-           <layout class="QVBoxLayout" name="verticalLayout_3">
-            <item>
-             <widget class="QLabel" name="label">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="text">
-               <string>ISA Family</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="ISAFamilyComboBox" name="isaFamilySelector">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-             </widget>
-            </item>
-           </layout>
-          </item>
-          <item>
-           <layout class="QVBoxLayout" name="verticalLayout_2">
-            <item>
-             <widget class="QLabel" name="label_4">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="text">
-               <string>ISA Register Width</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="ISAComboBox" name="isaSelector">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-             </widget>
-            </item>
-           </layout>
-          </item>
-          <item>
-           <layout class="QVBoxLayout" name="verticalLayout_4">
-            <item>
-             <widget class="QLabel" name="label_5">
-              <property name="text">
-               <string>Main Extension</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="QComboBox" name="mainExtensionSelector"/>
-            </item>
-           </layout>
-          </item>
-          <item>
-           <layout class="QVBoxLayout" name="verticalLayout_5">
-            <item>
-             <widget class="QLabel" name="label_6">
-              <property name="text">
-               <string>All Extensions</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <layout class="QGridLayout" name="extensionCheckboxGrid"/>
-            </item>
-           </layout>
-          </item>
-         </layout>
+         <layout class="QHBoxLayout" name="horizontalLayout_3"/>
         </widget>
        </item>
        <item>
@@ -167,14 +84,10 @@
    <header>sliderulestab.h</header>
   </customwidget>
   <customwidget>
-   <class>ISAFamilyComboBox</class>
-   <extends>QComboBox</extends>
-   <header>sliderulestab.h</header>
-  </customwidget>
-  <customwidget>
-   <class>ISAComboBox</class>
-   <extends>QComboBox</extends>
+   <class>ISAEncodingFilters</class>
+   <extends>QFrame</extends>
    <header>sliderulestab.h</header>
+   <container>1</container>
   </customwidget>
  </customwidgets>
  <resources/>