--- nono/vm/sram.h	2026/04/29 17:05:17	1.1.1.10
+++ nono/vm/sram.h	2026/04/29 17:05:24	1.1.1.11
@@ -25,19 +25,20 @@ class SRAMDevice : public IODevice
 
  public:
 	SRAMDevice();
-	virtual ~SRAMDevice() override;
+	~SRAMDevice() override;
 
 	bool Init() override;
 	void ResetHard(bool poweron) override;
 
-	uint64 Read8(uint32 addr) override;
-	uint64 Read16(uint32 addr) override;
-	uint64 Write8(uint32 addr, uint32 data) override;
-	uint64 Write16(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 Write8(uint32 addr, uint32 data) override;
+	busdata Write16(uint32 addr, uint32 data) override;
+	busdata Peek8(uint32 addr) override;
+	bool Poke8(uint32 addr, uint32 data) override;
 
 	void WriteEnable(bool value);
+	bool IsWriteable() const { return writeable; }
 
 	// SRAM の指定の位置の値を副作用なく読み出す
 	uint32 Get8(uint32 offset) const;
@@ -58,7 +59,7 @@ class SRAMDevice : public IODevice
 	void SyncRAMSize();
 
 	// アドレスデコーダ
-	uint64 Decoder(uint32 addr) const;
+	uint32 Decoder(uint32 addr) const;
 
 	// ファイル
 	std::string filename {};