diff --git a/sources/CPU/CPU.cpp b/sources/CPU/CPU.cpp
index 85573df..e932e21 100644
--- a/sources/CPU/CPU.cpp
+++ b/sources/CPU/CPU.cpp
@@ -209,6 +209,8 @@ namespace ComSquare::CPU
 
 	unsigned CPU::update(unsigned maxCycles)
 	{
+		if (this->isDisabled)
+			return 0xFF;
 		unsigned cycles = this->runDMA(maxCycles);
 
 		while (cycles < maxCycles) {
@@ -221,6 +223,8 @@ namespace ComSquare::CPU
 
 			if (!this->_isWaitingForInterrupt)
 				cycles += this->executeInstruction();
+			else
+				return 0xFF;
 		}
 		return cycles;
 	}
diff --git a/sources/CPU/CPU.hpp b/sources/CPU/CPU.hpp
index dd0dd9c..1ca1a4a 100644
--- a/sources/CPU/CPU.hpp
+++ b/sources/CPU/CPU.hpp
@@ -647,6 +647,9 @@ namespace ComSquare::CPU
 		//! @brief Is an abort requested
 		bool IsAbortRequested = false;
 
+		//! @brief True if you want to disable updates of this CPU.
+		bool isDisabled = false;
+
 #ifdef DEBUGGER_ENABLED
 		friend Debugger::CPU::CPUDebug;
 		friend Debugger::RegisterViewer;
diff --git a/sources/Debugger/CPU/CPUDebug.cpp b/sources/Debugger/CPU/CPUDebug.cpp
index 018f814..cf017ae 100644
--- a/sources/Debugger/CPU/CPUDebug.cpp
+++ b/sources/Debugger/CPU/CPUDebug.cpp
@@ -62,7 +62,7 @@ namespace ComSquare::Debugger::CPU
 		this->_updateRegistersPanel();
 		this->_updateDisassembly(this->_cpu._registers.pac, 0);
 
-		this->_cpu._isStopped = true;
+		this->_cpu.isDisabled = true;
 		this->_callback = this->_cpu.onReset.addCallback([this] {
 			this->disassembled.clear();
 			this->_updateDisassembly(0xFFFF - this->_cpu._cartridgeHeader.emulationInterrupts.reset);
@@ -78,7 +78,7 @@ namespace ComSquare::Debugger::CPU
 	CPUDebug::~CPUDebug()
 	{
 		this->_cpu.onReset.removeCallback(this->_callback);
-		this->_cpu._isStopped = false;
+		this->_cpu.isDisabled = false;
 	}
 
 	unsigned CPUDebug::update()
diff --git a/sources/Renderer/QtRenderer/QtSFML.cpp b/sources/Renderer/QtRenderer/QtSFML.cpp
index af8d550..1e56176 100644
--- a/sources/Renderer/QtRenderer/QtSFML.cpp
+++ b/sources/Renderer/QtRenderer/QtSFML.cpp
@@ -7,6 +7,8 @@
 #include <QIcon>
 #include <QMenuBar>
 #include <iostream>
+#include <QDir>
+#include <QFileDialog>
 #include "Models/Logger.hpp"
 #include "SNES.hpp"
 #include "QtSFML.hpp"
@@ -68,6 +70,14 @@ namespace ComSquare::Renderer
 		}
 	}
 
+	void QtFullSFML::openRom()
+	{
+		auto rom = QFileDialog::getOpenFileName(nullptr, tr("Open a ROM"), QDir::homePath(),
+												tr("Rom files (*.sfc, *.smc);;Audio rom files (*.spc);;All files (*)"));
+		if (!rom.isEmpty())
+			this->_snes.loadRom(rom.toStdString());
+	}
+
 	void QtFullSFML::reset()
 	{
 		this->_snes.cpu.RESB();
@@ -129,8 +139,9 @@ namespace ComSquare::Renderer
 		this->_window.setCentralWidget(this->_sfWidget);
 
 		QMenu *file = this->_window.menuBar()->addMenu("&File");
-		//TODO implement rom opening from this menu.
-		(void)file;
+		auto *open = new QAction("Open", &this->_window);
+		QMainWindow::connect(open, &QAction::triggered, this->_sfWidget, &QtFullSFML::openRom);
+		file->addAction(open);
 
 		QMenu *game = this->_window.menuBar()->addMenu("&Game");
 		auto *reset = new QAction("Reset", &this->_window);
diff --git a/sources/Renderer/QtRenderer/QtSFML.hpp b/sources/Renderer/QtRenderer/QtSFML.hpp
index f697d4d..7193450 100644
--- a/sources/Renderer/QtRenderer/QtSFML.hpp
+++ b/sources/Renderer/QtRenderer/QtSFML.hpp
@@ -22,6 +22,9 @@ namespace ComSquare::Renderer
 		SNES &_snes;
 		void onUpdate() override;
 	public:
+		//! @brief Open the select rom dialog and load a new one if the option is selected.
+		void openRom();
+
 #ifdef DEBUGGER_ENABLED
 		//! @brief Action called when clicking on the enable CPU debugger button.
 		void enableDebugCPU();
diff --git a/sources/SNES.cpp b/sources/SNES.cpp
index f4a8dc5..7f75592 100644
--- a/sources/SNES.cpp
+++ b/sources/SNES.cpp
@@ -47,6 +47,8 @@ namespace ComSquare
 	{
 		this->cartridge.loadRom(path);
 		this->bus.mapComponents(*this);
+		this->cpu.RESB();
+		this->apu.reset();
 		if (this->cartridge.getType() == Cartridge::Audio)
 			this->apu.loadFromSPC(this->cartridge);
 	}
diff --git a/sources/main.cpp b/sources/main.cpp
index 63046d6..db4514c 100644
--- a/sources/main.cpp
+++ b/sources/main.cpp
@@ -65,21 +65,21 @@ void parseArguments(int argc, char **argv, SNES &snes)
 		case 'c':
 			snes.enableCPUDebugging();
 			break;
-//		case 'a':
-//			snes.enableAPUDebugging();
-//			break;
+		case 'a':
+			snes.enableAPUDebugging();
+			break;
 		case 'm':
 			snes.enableRamViewer();
 			break;
 		case 'H':
 			snes.enableHeaderViewer();
 			break;
-//		case 'b':
-//			snes.enableMemoryBusDebugging();
-//			break;
-//		case 'g':
-//			snes.enableCgramViewer();
-//			break;
+		case 'b':
+			snes.enableMemoryBusDebugging();
+			break;
+		case 'g':
+			snes.enableCgramViewer();
+			break;
 		case 'r':
 			snes.enableRegisterViewer();
 			break;