--- nono/vm/crtc.h	2026/04/29 17:04:35	1.1.1.2
+++ nono/vm/crtc.h	2026/04/29 17:04:44	1.1.1.4
@@ -48,7 +48,7 @@ class CRTCDevice
 	using inherited = IODevice;
  public:
 	CRTCDevice();
-	~CRTCDevice() override;
+	virtual ~CRTCDevice() override;
 
 	void ResetHard() override;
 
@@ -63,7 +63,7 @@ class CRTCDevice
 	void SetReg(uint32 offset, uint32 data);
 
 	// 垂直表示期間イベント
-	void VDispCallback(int arg);
+	void VDispCallback(Event& ev);
 
 	struct CRTC crtc {};