--- nono/vm/bt454.h	2026/04/29 17:04:31	1.1.1.2
+++ nono/vm/bt454.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
@@ -47,15 +48,15 @@ struct BT454
 class BT454Device
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
 	friend BitmapDevice;	// Monitor は Bitmap を間借りしている
 
  public:
 	BT454Device();
-	virtual ~BT454Device();
-	virtual bool Init();
+	~BT454Device() override;
 
-	virtual void ResetHard();
+	bool Init() override;
+	void ResetHard() override;
 
 	// ホストパレットのアドレスを取得
 	const uint8 *GetHostPalette() const { return reg.hostcolor; }