--- nono/vm/crtc.h	2026/04/29 17:05:17	1.1.1.9
+++ nono/vm/crtc.h	2026/04/29 17:05:24	1.1.1.10
@@ -133,19 +133,20 @@ class CRTCDevice : public IODevice
 	using inherited = IODevice;
  public:
 	CRTCDevice();
-	virtual ~CRTCDevice() override;
+	~CRTCDevice() override;
 
 	bool Init() override;
 	void ResetHard(bool poweron) override;
 
- protected:
-	// BusIO インタフェース
-	static const uint NPORT = 0x800;
-	uint64 Read(uint32 offset);
-	uint64 Write(uint32 offset, uint32 data);
-	uint64 Peek(uint32 offset);
+	busdata Read8(uint32 offset) override;
+	busdata Read16(uint32 offset) override;
+	busdata Write8(uint32 offset, uint32 data) override;
+	busdata Write16(uint32 offset, uint32 data) override;
+	busdata Peek8(uint32 offset) override;
 
  private:
+	// ワード読み出し
+	busdata Peek16(uint32 addr) const;
 	// レジスタへの書き込み
 	void SetReg(uint32 offset, uint32 data);
 	// 動作ポートへの書き込み