@@ -32,6 +32,7 @@ - Ability to lock aspect ratio
  - Local link cable support
  - Ability to switch which game controller is in use per instance
  - Ability to prevent opposing directional input
+ - Warning dialog if an unimplemented BIOS feature is called
 Bugfixes:
  - ARM7: Extend prefetch by one stage
  - GBA Audio: Support 16-bit writes to FIFO audio

@@ -118,7 +118,14 @@ controller->frameAvailable(controller->m_drawContext);
 	};
 
 	m_threadContext.logHandler = [] (GBAThread* context, enum GBALogLevel level, const char* format, va_list args) {
+		static const char* stubMessage = "Stub software interrupt";
 		GameController* controller = static_cast<GameController*>(context->userData);
+		if (level == GBA_LOG_STUB && strncmp(stubMessage, format, strlen(stubMessage)) == 0) {
+			va_list argc;
+			va_copy(argc, args);
+			int immediate = va_arg(argc, int);
+			controller->unimplementedBiosCall(immediate);
+		}
 		if (level == GBA_LOG_FATAL) {
 			QMetaObject::invokeMethod(controller, "crashGame", Q_ARG(const QString&, QString().vsprintf(format, args)));
 		} else if (!(controller->m_logLevels & level)) {

@@ -85,6 +85,7 @@ void gameUnpaused(GBAThread*);
 	void gameCrashed(const QString& errorMessage);
 	void gameFailed();
 	void stateLoaded(GBAThread*);
+	void unimplementedBiosCall(int);
 
 	void luminanceValueChanged(int);
 

@@ -97,6 +97,7 @@ connect(m_controller, SIGNAL(postLog(int, const QString&)), m_logView, SLOT(postLog(int, const QString&)));
 	connect(m_controller, SIGNAL(frameAvailable(const uint32_t*)), this, SLOT(recordFrame()));
 	connect(m_controller, SIGNAL(gameCrashed(const QString&)), this, SLOT(gameCrashed(const QString&)));
 	connect(m_controller, SIGNAL(gameFailed()), this, SLOT(gameFailed()));
+	connect(m_controller, SIGNAL(unimplementedBiosCall(int)), this, SLOT(unimplementedBiosCall(int)));
 	connect(m_logView, SIGNAL(levelsSet(int)), m_controller, SLOT(setLogLevel(int)));
 	connect(m_logView, SIGNAL(levelsEnabled(int)), m_controller, SLOT(enableLogLevel(int)));
 	connect(m_logView, SIGNAL(levelsDisabled(int)), m_controller, SLOT(disableLogLevel(int)));
@@ -411,6 +412,7 @@ menuBar()->hide();
 	}
 #endif
 
+	m_hitUnimplementedBiosCall = false;
 	m_fpsTimer.start();
 }
 
@@ -437,6 +439,19 @@
 void Window::gameFailed() {
 	QMessageBox* fail = new QMessageBox(QMessageBox::Warning, tr("Couldn't Load"),
 		tr("Could not load game. Are you sure it's in the correct format?"),
+		QMessageBox::Ok, this,  Qt::Sheet);
+	fail->setAttribute(Qt::WA_DeleteOnClose);
+	fail->show();
+}
+
+void Window::unimplementedBiosCall(int call) {
+	if (m_hitUnimplementedBiosCall) {
+		return;
+	}
+	m_hitUnimplementedBiosCall = true;
+
+	QMessageBox* fail = new QMessageBox(QMessageBox::Warning, tr("Unimplemented BIOS call"),
+		tr("This game uses a BIOS call that is not implemented. Please use the official BIOS for best experience."),
 		QMessageBox::Ok, this,  Qt::Sheet);
 	fail->setAttribute(Qt::WA_DeleteOnClose);
 	fail->show();

@@ -101,6 +101,7 @@ void gameStarted(GBAThread*);
 	void gameStopped();
 	void gameCrashed(const QString&);
 	void gameFailed();
+	void unimplementedBiosCall(int);
 
 	void recordFrame();
 	void showFPS();
@@ -135,6 +136,8 @@ QList<QString> m_mruFiles;
 	QMenu* m_mruMenu;
 	ShortcutController* m_shortcutController;
 	int m_playerId;
+
+	bool m_hitUnimplementedBiosCall;
 
 #ifdef USE_FFMPEG
 	VideoView* m_videoView;