--- nono/vm/sio.h	2026/04/29 17:04:29	1.1.1.2
+++ nono/vm/sio.h	2026/04/29 17:04:32	1.1.1.3
@@ -18,13 +18,15 @@ class SIODevice
 
 	virtual void ResetHard();
 
-	virtual uint64 Read8(uint32);
-	virtual uint64 Read16(uint32);
-	virtual uint64 Write8(uint32, uint32);
-	virtual uint64 Write16(uint32, uint32);
+ protected:
+	// BusIO インタフェース
+	static const uint32 NPORT = 4;
+	uint64 Read(uint32 addr);
+	uint64 Write(uint32 addr, uint32 data);
+	uint64 Peek(uint32 addr);
 
  private:
 	virtual void Interrupt();
 };
 
-extern SIODevice *gSIO;
+extern std::unique_ptr<SIODevice> gSIO;