--- nono/vm/goldfish_rtc.h	2026/04/29 17:05:24	1.1
+++ nono/vm/goldfish_rtc.h	2026/04/29 17:05:28	1.1.1.2
@@ -18,14 +18,14 @@ class TextScreen;
 class GFRTC
 {
  public:
-	static const uint TIME_LOW		= 0x00;
-	static const uint TIME_HIGH		= 0x04;
-	static const uint ALARM_LOW		= 0x08;
-	static const uint ALARM_HIGH	= 0x0c;
-	static const uint INTR_STATUS	= 0x10;
-	static const uint ALARM_CLEAR	= 0x14;
-	static const uint ALARM_STATUS	= 0x18;
-	static const uint INTR_CLEAR	= 0x1c;
+	static const uint TIME_LOW		= 0x00U >> 2;
+	static const uint TIME_HIGH		= 0x04U >> 2;
+	static const uint ALARM_LOW		= 0x08U >> 2;
+	static const uint ALARM_HIGH	= 0x0cU >> 2;
+	static const uint INTR_STATUS	= 0x10U >> 2;
+	static const uint ALARM_CLEAR	= 0x14U >> 2;
+	static const uint ALARM_STATUS	= 0x18U >> 2;
+	static const uint INTR_CLEAR	= 0x1cU >> 2;
 };
 
 class GFRTCDevice : public RTCDevice
@@ -39,13 +39,16 @@ class GFRTCDevice : public RTCDevice
 	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;
-
 	// モニタの下請け。(GFTimer から呼ばれる)
 	int MonitorUpdateRTC(TextScreen&, int y) const;
 
+ 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:
 	void Tick1Hz() override;