--- nono/vm/crtc2.h	2026/04/29 17:04:31	1.1.1.2
+++ nono/vm/crtc2.h	2026/04/29 17:04:50	1.1.1.6
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2018 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -11,29 +12,31 @@
 class CRTC2Device
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
  public:
 	CRTC2Device();
-	virtual ~CRTC2Device();
+	virtual ~CRTC2Device() override;
 
-	virtual void ResetHard();
+	void ResetHard() override;
 
  protected:
 	// BusIO インタフェース
 	static const uint32 NPORT = 2;
-	uint64 Read(uint32 addr);
-	uint64 Write(uint32 addr, uint32 data);
-	uint64 Peek(uint32 addr);
+	uint64 Read(uint32 offset);
+	uint64 Write(uint32 offset, uint32 data);
+	uint64 Peek(uint32 offset);
 
  private:
 	// 垂直表示期間イベント
-	void VDispCallback(int arg);
+	void VDispCallback(Event& ev);
 
 	// アドレスレジスタ
-	int ar = 0;
+	int ar {};
 
 	// レジスタ
 	uint8 reg[40] {};
 
 	Event vdisp_event {};
 };
+
+extern std::unique_ptr<CRTC2Device> gCRTC2;