--- nono/vm/pio.h	2026/04/29 17:05:17	1.1.1.11
+++ nono/vm/pio.h	2026/04/29 17:05:25	1.1.1.12
@@ -29,7 +29,7 @@ class i8255Device : public IODevice
 
  public:
 	i8255Device(int objid_);
-	virtual ~i8255Device() override;
+	~i8255Device() override;
 
 	void ResetHard(bool poweron) override;
 
@@ -75,7 +75,7 @@ class PPIDevice : public i8255Device
 
  public:
 	PPIDevice();
-	virtual ~PPIDevice() override;
+	~PPIDevice() override;
 
 	// ADPCM のサンプリングレートの 2bit を取得する
 	uint8 GetADPCMRate() const { return adpcm_rate; }
@@ -83,9 +83,9 @@ class PPIDevice : public i8255Device
  protected:
 	// BusIO インタフェース
 	static const uint32 NPORT = 4;
-	uint64 Read(uint32 offset);
-	uint64 Write(uint32 offset, uint32 data);
-	uint64 Peek(uint32 offset);
+	busdata Read(uint32 offset);
+	busdata Write(uint32 offset, uint32 data);
+	busdata Peek(uint32 offset);
 
  private:
 	void SetPC(int, int) override;
@@ -104,7 +104,7 @@ class PIO0Device : public i8255Device
 
  public:
 	PIO0Device();
-	virtual ~PIO0Device() override;
+	~PIO0Device() override;
 
 	bool Init() override;
 	void ResetHard(bool poweron) override;
@@ -119,9 +119,9 @@ class PIO0Device : public i8255Device
  protected:
 	// BusIO インタフェース
 	static const uint32 NPORT = 4;
-	uint64 Read(uint32 offset);
-	uint64 Write(uint32 offset, uint32 data);
-	uint64 Peek(uint32 offset);
+	busdata Read(uint32 offset);
+	busdata Write(uint32 offset, uint32 data);
+	busdata Peek(uint32 offset);
 
  private:
 	uint32 GetPA() const;
@@ -151,14 +151,14 @@ class PIO1Device : public i8255Device
 	using inherited = i8255Device;
  public:
 	PIO1Device();
-	virtual ~PIO1Device() override;
+	~PIO1Device() override;
 
 	bool Init() override;
 	void ResetHard(bool poweron) override;
 
 	// BusIO インタフェース
 	// (内蔵 ROM からのアクセス用に特別に public にしてある)
-	uint64 Write(uint32 offset, uint32 data);
+	busdata Write(uint32 offset, uint32 data);
 
 	// PIO0 の下請け
 	void MonitorUpdatePIO1(TextScreen& screen, int y);
@@ -166,8 +166,8 @@ class PIO1Device : public i8255Device
  protected:
 	// BusIO インタフェース
 	static const uint32 NPORT = 4;
-	uint64 Read(uint32 offset);
-	uint64 Peek(uint32 offset);
+	busdata Read(uint32 offset);
+	busdata Peek(uint32 offset);
 
  private:
 	uint32 GetPC() const;