--- nono/vm/sysclk.h	2026/04/29 17:04:32	1.1.1.2
+++ nono/vm/sysclk.h	2026/04/29 17:04:36	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 +12,13 @@
 class SysClkDevice
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
  public:
 	SysClkDevice();
-	virtual ~SysClkDevice();
+	~SysClkDevice() override;
 
-	virtual bool PowerOn();
+	bool Init() override;
+	bool PowerOn() override;
 
  protected:
 	// BusIO インタフェース