--- nono/vm/prom.h	2026/04/29 17:04:55	1.1.1.5
+++ nono/vm/prom.h	2026/04/29 17:04:59	1.1.1.6
@@ -6,10 +6,39 @@
 
 #pragma once
 
-#include "ethernet.h"
 #include "rom.h"
 #include "stopwatch.h"
 
+class PROMDevice;
+
+class PROM0Device : public IODevice
+{
+	using inherited = IODevice;
+ public:
+	PROM0Device();
+	virtual ~PROM0Device() override;
+
+	bool Init() override;
+	void ResetHard() 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;
+
+ private:
+	// アドレスデコーダ
+	static uint32 Decoder(uint32 addr);
+
+	// 書き込みの共通部分
+	uint64 Write();
+
+	IODevice *prom {};
+};
+
 class PROMDevice : public ROMDevice
 {
 	using inherited = ROMDevice;
@@ -19,23 +48,16 @@ class PROMDevice : public ROMDevice
 
 	bool Init() override;
 	bool PowerOn() override;
-	void ResetHard() override;
 
 	uint64 Read8(uint32 addr) override;
-	uint64 Write8(uint32 addr, uint32 data) override;
-	uint64 Write16(uint32 addr, uint32 data) override;
-	uint64 Write32(uint32 addr, uint32 data) override;
 
  private:
 	bool InitLuna1();
 	bool InitLuna88k();
-	uint64 Write(uint32 addr);
-
-	// ROM->RAM 切り替え用フラグ。true なら ROM モード
-	bool isrom {};
 
 	// パフォーマンス測定用
 	Stopwatch sw {};
 };
 
-extern std::unique_ptr<PROMDevice> gPROM;
+extern std::unique_ptr<PROM0Device> gPROM0;
+extern std::unique_ptr<IODevice> gPROM;