diff --git a/Components/8272/i8272.hpp b/Components/8272/i8272.hpp
index 76fc33ee3..cb589343c 100644
--- a/Components/8272/i8272.hpp
+++ b/Components/8272/i8272.hpp
@@ -47,7 +47,7 @@ class i8272 : public Storage::Disk::MFMController {
 
 	private:
 		// The bus handler, for interrupt and DMA-driven usage. [TODO]
-        BusHandler &bus_handler_;
+		BusHandler &bus_handler_;
 		std::unique_ptr<BusHandler> allocated_bus_handler_;
 
 		// Status registers.
diff --git a/OSBindings/Qt/ClockSignal.pro b/OSBindings/Qt/ClockSignal.pro
index 93a1b9352..61ded61de 100644
--- a/OSBindings/Qt/ClockSignal.pro
+++ b/OSBindings/Qt/ClockSignal.pro
@@ -122,7 +122,8 @@ SOURCES += \
     ../../Storage/Tape/Parsers/*.cpp \
 \
     main.cpp \
-    mainwindow.cpp
+    mainwindow.cpp \
+    timer.cpp
 
 HEADERS += \
     ../../Activity/*.hpp \
@@ -245,7 +246,8 @@ HEADERS += \
     ../../Storage/Tape/Formats/*.hpp \
     ../../Storage/Tape/Parsers/*.hpp \
 \
-    mainwindow.h
+    mainwindow.h \
+    timer.h
 
 FORMS += \
     mainwindow.ui
diff --git a/OSBindings/Qt/main.cpp b/OSBindings/Qt/main.cpp
index fd3e53341..1cd93da31 100644
--- a/OSBindings/Qt/main.cpp
+++ b/OSBindings/Qt/main.cpp
@@ -4,8 +4,8 @@
 
 int main(int argc, char *argv[])
 {
-    QApplication a(argc, argv);
-    MainWindow w;
-    w.show();
-    return a.exec();
+	QApplication a(argc, argv);
+	MainWindow w;
+	w.show();
+	return a.exec();
 }
diff --git a/OSBindings/Qt/mainwindow.cpp b/OSBindings/Qt/mainwindow.cpp
index 41a26bdf8..5da0b48bd 100644
--- a/OSBindings/Qt/mainwindow.cpp
+++ b/OSBindings/Qt/mainwindow.cpp
@@ -1,15 +1,57 @@
+#include <QtWidgets>
+#include <QObject>
+
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
+#include "timer.h"
+
+Timer *t;
 
 MainWindow::MainWindow(QWidget *parent)
-    : QMainWindow(parent)
-    , ui(new Ui::MainWindow)
+	: QMainWindow(parent)
+	, ui(new Ui::MainWindow)
 {
-    ui->setupUi(this);
+	ui->setupUi(this);
+	createActions();
+
+	// Start the emulation timer. TODO: not now.
+	timer = std::make_unique<QTimer>(this);
+	QThread *thread = new QThread(this);
+	timer->setInterval(1);
+	t = new Timer;
+	t->moveToThread(thread);
+	connect(timer.get(), SIGNAL(timeout()), t, SLOT(tick()));
+	connect(thread, SIGNAL(finished()), t, SLOT(deleteLater()));
+	thread->start();
+	timer->start();
 }
 
-MainWindow::~MainWindow()
-{
-    delete ui;
+void MainWindow::createActions() {
+	// Create a file menu.
+	QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+
+//	QAction *newAct = new QAction(tr("&New"), this);
+//	newAct->setShortcuts(QKeySequence::New);
+//	newAct->setStatusTip(tr("Create a new file"));
+//	connect(newAct, &QAction::triggered, this, &MainWindow::newFile);
+//	fileMenu->addAction(newAct);
+
+	// Add file option: 'Open..."
+	QAction *openAct = new QAction(tr("&Open..."), this);
+	openAct->setShortcuts(QKeySequence::Open);
+	openAct->setStatusTip(tr("Open an existing file"));
+	connect(openAct, &QAction::triggered, this, &MainWindow::open);
+	fileMenu->addAction(openAct);
+
+}
+
+void MainWindow::open() {
+	QString fileName = QFileDialog::getOpenFileName(this);
+//	if(!fileName.isEmpty())
+//		loadFile(fileName);
+}
+
+MainWindow::~MainWindow() {
+	// TODO: stop thread somehow?
 }
 
diff --git a/OSBindings/Qt/mainwindow.h b/OSBindings/Qt/mainwindow.h
index 4643e322a..a4d8c2b5c 100644
--- a/OSBindings/Qt/mainwindow.h
+++ b/OSBindings/Qt/mainwindow.h
@@ -2,20 +2,27 @@
 #define MAINWINDOW_H
 
 #include <QMainWindow>
+#include <memory>
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
 QT_END_NAMESPACE
 
-class MainWindow : public QMainWindow
-{
-    Q_OBJECT
+class MainWindow : public QMainWindow {
+		Q_OBJECT
 
-public:
-    MainWindow(QWidget *parent = nullptr);
-    ~MainWindow();
+		void createActions();
 
-private:
-    Ui::MainWindow *ui;
+	public:
+		MainWindow(QWidget *parent = nullptr);
+		~MainWindow();
+
+	private:
+		std::unique_ptr<Ui::MainWindow> ui;
+		std::unique_ptr<QTimer> timer;
+
+	private slots:
+		void open();
 };
+
 #endif // MAINWINDOW_H
diff --git a/OSBindings/Qt/mainwindow.ui b/OSBindings/Qt/mainwindow.ui
index b232854ba..6537e2903 100644
--- a/OSBindings/Qt/mainwindow.ui
+++ b/OSBindings/Qt/mainwindow.ui
@@ -10,11 +10,30 @@
     <height>600</height>
    </rect>
   </property>
+  <property name="minimumSize">
+   <size>
+    <width>400</width>
+    <height>300</height>
+   </size>
+  </property>
+  <property name="acceptDrops">
+   <bool>true</bool>
+  </property>
   <property name="windowTitle">
    <string>MainWindow</string>
   </property>
-  <widget class="QWidget" name="centralwidget"/>
-  <widget class="QMenuBar" name="menubar"/>
+  <widget class="QOpenGLWidget" name="openGLWidget">
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>22</height>
+    </rect>
+   </property>
+  </widget>
   <widget class="QStatusBar" name="statusbar"/>
  </widget>
  <resources/>
diff --git a/OSBindings/Qt/timer.cpp b/OSBindings/Qt/timer.cpp
new file mode 100644
index 000000000..74984f84f
--- /dev/null
+++ b/OSBindings/Qt/timer.cpp
@@ -0,0 +1,14 @@
+#include "timer.h"
+
+#include "../../ClockReceiver/TimeTypes.hpp"
+
+#include <QDebug>
+
+Timer::Timer(QObject *parent) : QObject(parent) {}
+
+void Timer::tick() {
+//	static int64_t last = 0;
+//	const auto now = Time::nanos_now();
+//	qDebug() << now - last;
+//	last = now;
+}
diff --git a/OSBindings/Qt/timer.h b/OSBindings/Qt/timer.h
new file mode 100644
index 000000000..c137332b6
--- /dev/null
+++ b/OSBindings/Qt/timer.h
@@ -0,0 +1,17 @@
+#ifndef TIMER_H
+#define TIMER_H
+
+#include <QObject>
+
+class Timer : public QObject
+{
+		Q_OBJECT
+
+	public:
+		explicit Timer(QObject *parent = nullptr);
+
+	public slots:
+		void tick();
+};
+
+#endif // TIMER_H