--- nono/vm/pio.h	2026/04/29 17:04:32	1.1.1.1
+++ nono/vm/pio.h	2026/04/29 17:04:36	1.1.1.2
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -14,11 +15,11 @@
 class i8255Device
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
 
  public:
 	i8255Device();
-	virtual ~i8255Device();
+	~i8255Device() override;
 
  protected:
 	// コントロールポートの読み出し
@@ -54,13 +55,13 @@ class i8255Device
 class PPIDevice
 	: public i8255Device
 {
-	typedef i8255Device inherited;
+	using inherited = i8255Device;
  private:
 	static const int baseaddr = 0xe9a000;
 
  public:
 	PPIDevice();
-	virtual ~PPIDevice();
+	~PPIDevice() override;
 
  protected:
 	// BusIO インタフェース
@@ -73,12 +74,13 @@ class PPIDevice
 class PIO0Device
 	: public i8255Device
 {
-	typedef i8255Device inherited;
+	using inherited = i8255Device;
  public:
 	PIO0Device();
-	virtual ~PIO0Device();
+	~PIO0Device() override;
 
-	virtual bool Init();
+	bool Init() override;
+	bool MonitorUpdate() override;
 
 	// DIP-SW1 の状態を取得 (ROM エミュレーション用)
 	//
@@ -100,7 +102,7 @@ class PIO0Device
 	uint32 GetPA() const;
 	uint32 GetPB() const;
 	uint32 GetPC() const;
-	virtual void SetPC(int, int);
+	void SetPC(int, int) override;
 
 	bool dipsw1[8] {};
 	bool dipsw2[8] {};
@@ -115,10 +117,10 @@ class PIO0Device
 class PIO1Device
 	: public i8255Device
 {
-	typedef i8255Device inherited;
+	using inherited = i8255Device;
  public:
 	PIO1Device();
-	virtual ~PIO1Device();
+	~PIO1Device() override;
 
  protected:
 	// BusIO インタフェース
@@ -128,7 +130,7 @@ class PIO1Device
 	uint64 Peek(uint32 addr);
 
  private:
-	virtual void SetPC(int, int);
+	void SetPC(int, int) override;
 	void PowerOffCallback(int);
 
 	bool power = false;		// パワーダウン (false で電源オフ指示)