--- nono/vm/scc.h	2026/04/29 17:04:36	1.1.1.3
+++ nono/vm/scc.h	2026/04/29 17:04:45	1.1.1.4
@@ -18,7 +18,7 @@ class SCCDevice
 
  public:
 	SCCDevice();
-	~SCCDevice() override;
+	virtual ~SCCDevice() override;
 
 	void ResetHard() override;
 
@@ -26,7 +26,8 @@ class SCCDevice
 	uint8 ReadCtrl(struct SIO::channel *chan) override;
 	void WriteCtrl(struct SIO::channel *chan, uint32 data) override;
 
-	void Interrupt() override;
+	// 割り込みアクノリッジ
+	int InterruptAcknowledge();
 
  protected:
 	// BusIO インタフェース
@@ -34,6 +35,9 @@ class SCCDevice
 	uint64 Read(uint32 addr);
 	uint64 Write(uint32 addr, uint32 data);
 	uint64 Peek(uint32 addr);
+
+ private:
+	void Interrupt() override;
 };
 
 extern std::unique_ptr<SCCDevice> gSCC;