--- nono/vm/fdc.h	2026/04/29 17:04:41	1.1.1.3
+++ nono/vm/fdc.h	2026/04/29 17:04:50	1.1.1.5
@@ -72,7 +72,7 @@ struct FDC {
 	static const int STAT_RQM		= 0x80;	// Request For Master
 	static const int STAT_DIO		= 0x40;	// Data Input/Output
 	static const int STAT_NDM		= 0x20;	// Non-DMA Mode
-	static const int STAT_CB 		= 0x10;	// FDC Busy
+	static const int STAT_CB		= 0x10;	// FDC Busy
 	static const int STAT_D3B		= 0x08;	// FD3 Busy
 	static const int STAT_D2B		= 0x04;	// FD2 Busy
 	static const int STAT_D1B		= 0x02;	// FD1 Busy
@@ -109,16 +109,16 @@ class FDCDevice
 
  public:
 	FDCDevice();
-	~FDCDevice() override;
+	virtual ~FDCDevice() override;
 
 	void ResetHard() override;
 
  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 Read(uint32 offset);
+	uint64 Write(uint32 offset, uint32 data);
+	uint64 Peek(uint32 offset);
 
  private:
 	uint32 ReadStatus();
@@ -145,3 +145,5 @@ class FDCDevice
 	// コマンド名一覧
 	static const char *cmdnames_str[];
 };
+
+extern std::unique_ptr<FDCDevice> gFDC;