--- nono/vm/goldfish_tty.h	2026/04/29 17:05:25	1.1
+++ nono/vm/goldfish_tty.h	2026/04/29 17:05:29	1.1.1.2
@@ -22,18 +22,20 @@ class GFTTYDevice : public IODevice
 {
 	using inherited = IODevice;
 
-	static const uint32 PUT_CHAR	= 0x00;
-	static const uint32 BYTES_READY	= 0x04;
-	static const uint32 COMMAND		= 0x08;
-	static const uint32 DATA_PTR	= 0x10;
-	static const uint32 DATA_LEN	= 0x14;
-	static const uint32 VERSION		= 0x20;
+	static const uint32 PUT_CHAR	= 0x00U >> 2;
+	static const uint32 BYTES_READY	= 0x04U >> 2;
+	static const uint32 COMMAND		= 0x08U >> 2;
+	static const uint32 DATA_PTR	= 0x10U >> 2;
+	static const uint32 DATA_LEN	= 0x14U >> 2;
+	static const uint32 VERSION		= 0x20U >> 2;
 
 	static const uint32 CMD_INT_DISABLE		= 0x00;
 	static const uint32 CMD_INT_ENABLE		= 0x01;
 	static const uint32 CMD_WRITE_BUFFER	= 0x02;
 	static const uint32 CMD_READ_BUFFER		= 0x03;
 
+	static const uint32 GFTTYVersion		= 1;
+
  public:
 	GFTTYDevice();
 	~GFTTYDevice() override;
@@ -43,11 +45,15 @@ class GFTTYDevice : public IODevice
 	bool Init() override;
 	void ResetHard(bool poweron) override;
 
-	busdata Read32(uint32 addr) override;
-	busdata Write32(uint32 addr, uint32 data) override;
-	busdata Peek8(uint32 addr) override;
+ protected:
+	// BusIO インタフェース
+	static const uint32 NPORT = 0x1000 >> 2;
+	busdata ReadPort(uint32 offset);
+	busdata WritePort(uint32 offset, uint32 data);
+	busdata PeekPort(uint32 offset);
 
  private:
+	uint32 GetREADY() const;
 	void Command(uint32);
 	void ChangeInterrupt();