--- nono/vm/subram.h	2026/04/29 17:05:17	1.1.1.1
+++ nono/vm/subram.h	2026/04/29 17:05:25	1.1.1.2
@@ -18,22 +18,22 @@ class SubRAMBaseDevice : public IODevice
 	using inherited = IODevice;
  public:
 	SubRAMBaseDevice(int objid_, uint ramsize_kb);
-	virtual ~SubRAMBaseDevice() override;
+	~SubRAMBaseDevice() override;
 
 	void ResetHard(bool poweron) override;
 
-	uint64 Read8(uint32 addr) override;
-	uint64 Read16(uint32 addr) override;
-	uint64 Read32(uint32 addr) override;
-	uint64 Write8(uint32 addr, uint32 data) override;
-	uint64 Write16(uint32 addr, uint32 data) override;
-	uint64 Write32(uint32 addr, uint32 data) override;
-	uint64 Peek8(uint32 addr) override;
-	uint64 Poke8(uint32 addr, uint32 data) override;
+	busdata Read8(uint32 addr) override;
+	busdata Read16(uint32 addr) override;
+	busdata Read32(uint32 addr) override;
+	busdata Write8(uint32 addr, uint32 data) override;
+	busdata Write16(uint32 addr, uint32 data) override;
+	busdata Write32(uint32 addr, uint32 data) override;
+	busdata Peek8(uint32 addr) override;
+	bool Poke8(uint32 addr, uint32 data) override;
 
  private:
 	// アドレスデコーダ
-	uint64 Decoder(uint32 addr) const;
+	uint32 Decoder(uint32 addr) const;
 
 	std::unique_ptr<uint8[]> ram {};
 	uint ramsize {};