--- nono/vm/fuserom.h	2026/04/29 17:04:32	1.1
+++ nono/vm/fuserom.h	2026/04/29 17:06:00	1.1.1.10
@@ -1,21 +1,45 @@
 //
 // nono
-// Copyright (C) 2020 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
+//
+
+//
+// FuseROM
 //
 
 #pragma once
 
-#include "romimg.h"
+#include "device.h"
+#include <array>
 
-class FuseROMDevice : public ROMDevice
+class FuseROMDevice : public IODevice
 {
-	typedef ROMDevice inherited;
+	using inherited = IODevice;
+
+	// この ROM が保持できるデータ量 (バイト数換算)
+	static const uint32 SRCBYTES = 128;
  public:
 	FuseROMDevice();
-	virtual ~FuseROMDevice();
+	~FuseROMDevice() override;
 
-	bool Init();
+	bool Init() override;
+
+ protected:
+	// BusIO インタフェース
+	static const uint32 NPORT = SRCBYTES * 2;	// XXX 未調査
+	busdata ReadPort(uint32 offset);
+	busdata WritePort(uint32 offset, uint32 data);
+	busdata PeekPort(uint32 offset);
+	bool PokePort(uint32 offset, uint32 data);
 
  private:
-	uint8 src[1024];
+	uint8 GetByte(uint32 offset) const;
+
+	// バイトデータで保持しておく
+	std::array<uint8, SRCBYTES> src {};
 };
+
+inline FuseROMDevice *GetFuseROMDevice() {
+	return Object::GetObject<FuseROMDevice>(OBJ_FUSEROM);
+}