--- nono/vm/sio.h	2026/04/29 17:04:32	1.1.1.3
+++ nono/vm/sio.h	2026/04/29 17:04:36	1.1.1.4
@@ -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 SIODevice
 	: public uPD7201Device
 {
-	typedef uPD7201Device inherited;
+	using inherited = uPD7201Device;
  public:
 	SIODevice();
-	virtual ~SIODevice();
+	~SIODevice() override;
 
-	virtual void ResetHard();
+	void ResetHard() override;
 
  protected:
 	// BusIO インタフェース
@@ -26,7 +27,7 @@ class SIODevice
 	uint64 Peek(uint32 addr);
 
  private:
-	virtual void Interrupt();
+	void Interrupt() override;
 };
 
 extern std::unique_ptr<SIODevice> gSIO;