--- nono/vm/sio.h	2026/04/29 17:04:45	1.1.1.5
+++ nono/vm/sio.h	2026/04/29 17:05:07	1.1.1.8
@@ -9,22 +9,24 @@
 #include "device.h"
 #include "upd7201.h"
 
-class SIODevice
-	: public uPD7201Device
+class SIODevice : public uPD7201Device
 {
 	using inherited = uPD7201Device;
  public:
 	SIODevice();
 	virtual ~SIODevice() override;
 
-	void ResetHard() override;
+	// BusIO インタフェース
+	// (内蔵 ROM からのアクセス用に特別に public にしてある)
+	uint64 Read(uint32 offset);
+	uint64 Write(uint32 offset, uint32 data);
 
  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);
+	uint64 Peek(uint32 offset);
+
+	void Tx(int ch, uint32 data) override;
 
  private:
 	void Interrupt() override;