diff --git a/OSBindings/Qt/mainwindow.cpp b/OSBindings/Qt/mainwindow.cpp
index 7ec363529..ad9e13d4d 100644
--- a/OSBindings/Qt/mainwindow.cpp
+++ b/OSBindings/Qt/mainwindow.cpp
@@ -7,6 +7,7 @@
 
 #include "../../Numeric/CRC.hpp"
 
+
 /*
 	General Qt implementation notes:
 
@@ -35,11 +36,6 @@ MainWindow::MainWindow(QWidget *parent)
 
 	connect(qTimer.get(), SIGNAL(timeout()), timer.get(), SLOT(tick()));
 
-	// Start the thread and timer.
-	// TODO: not until there's actually something to display.
-	timerThread->start();
-	qTimer->start();
-
 	// Hide the missing ROMs box unless or until it's needed; grab the text it
 	// began with as a prefix for future mutation.
 	ui->missingROMsBox->setVisible(false);
@@ -144,12 +140,26 @@ void MainWindow::launchMachine() {
 	std::unique_ptr<Machine::DynamicMachine> machine(Machine::MachineForTargets(targets, rom_fetcher, error));
 
 	switch(error) {
-		default:
+		default: {
 			ui->missingROMsBox->setVisible(false);
 			uiPhase = UIPhase::RunningMachine;
 
-			// TODO: launch machine.
-		break;
+			// TODO: Install the OpenGL scan target.
+			// This is subject to having created an OpenGL context.
+//			const auto scan_producer = machine->scan_producer();
+//			if(scan_producer) {
+//				scan_producer->set_scan_target(&scanTarget);
+//			}
+
+			// If this is a timed machine, start up the timer.
+			const auto timedMachine = machine->timed_machine();
+			if(timedMachine) {
+				timer->setMachine(timedMachine);
+				timerThread->start();
+				qTimer->start();
+			}
+
+		} break;
 
 		case Machine::Error::MissingROM: {
 			ui->missingROMsBox->setVisible(true);
diff --git a/OSBindings/Qt/mainwindow.h b/OSBindings/Qt/mainwindow.h
index 819e56323..e3fa28c79 100644
--- a/OSBindings/Qt/mainwindow.h
+++ b/OSBindings/Qt/mainwindow.h
@@ -8,6 +8,7 @@
 
 #include "../../Analyser/Static/StaticAnalyser.hpp"
 #include "../../Machines/Utility/MachineForTarget.hpp"
+#include "../../Outputs/OpenGL/ScanTarget.hpp"
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
@@ -42,6 +43,9 @@ class MainWindow : public QMainWindow {
 		void dragEnterEvent(QDragEnterEvent* event) override;
 		void dropEvent(QDropEvent* event) override;
 
+		// Output.
+		Outputs::Display::OpenGL::ScanTarget scanTarget;
+
 	private slots:
 		void open();
 };
diff --git a/OSBindings/Qt/timer.cpp b/OSBindings/Qt/timer.cpp
index 74984f84f..157a97137 100644
--- a/OSBindings/Qt/timer.cpp
+++ b/OSBindings/Qt/timer.cpp
@@ -2,13 +2,19 @@
 
 #include "../../ClockReceiver/TimeTypes.hpp"
 
+#include <algorithm>
 #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;
+void Timer::setMachine(MachineTypes::TimedMachine *machine) {
+	this->machine = machine;
+}
+
+void Timer::tick() {
+	const auto now = Time::nanos_now();
+	const auto duration = std::min(now - lastTickNanos, int64_t(500'000));
+	lastTickNanos = now;
+
+	machine->run_for(double(duration) / 1e9);
 }
diff --git a/OSBindings/Qt/timer.h b/OSBindings/Qt/timer.h
index c137332b6..abc6b8c9d 100644
--- a/OSBindings/Qt/timer.h
+++ b/OSBindings/Qt/timer.h
@@ -3,15 +3,22 @@
 
 #include <QObject>
 
+#include "../../Machines/Utility/MachineForTarget.hpp"
+
 class Timer : public QObject
 {
 		Q_OBJECT
 
 	public:
 		explicit Timer(QObject *parent = nullptr);
+		void setMachine(MachineTypes::TimedMachine *machine);
 
 	public slots:
 		void tick();
+
+	private:
+		MachineTypes::TimedMachine *machine = nullptr;
+		int64_t lastTickNanos = 0;
 };
 
 #endif // TIMER_H