--- nono/vm/crtc2.h	2026/04/29 17:04:31	1.1.1.2
+++ nono/vm/crtc2.h	2026/04/29 17:04:35	1.1.1.3
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2018 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -11,12 +12,12 @@
 class CRTC2Device
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
  public:
 	CRTC2Device();
-	virtual ~CRTC2Device();
+	~CRTC2Device() override;
 
-	virtual void ResetHard();
+	void ResetHard() override;
 
  protected:
 	// BusIO インタフェース