--- nono/vm/xpbus.h	2026/04/29 17:05:17	1.1
+++ nono/vm/xpbus.h	2026/04/29 17:05:29	1.1.1.3
@@ -10,16 +10,17 @@
 
 #pragma once
 
-#include "device.h"
+#include "mainbus.h"
 #include <array>
 
+class SubRAMDevice;
 class SubRAM2Device;
 class XPRAMDevice;
 
 // XP 外部バス
-class XPbusDevice : public IOContainerDevice
+class XPbusDevice : public IODevice
 {
-	using inherited = IOContainerDevice;
+	using inherited = IODevice;
  public:
 	XPbusDevice();
 	~XPbusDevice() override;
@@ -27,14 +28,10 @@ class XPbusDevice : public IOContainerDe
 	bool Init() override;
 	void ResetHard(bool poweron) override;
 
-	// addr はそれぞれアラインされていること。
-	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;
+	busdata Read1(uint32 addr) override;
+	busdata Write1(uint32 addr, uint32 data) override;
+	busdata Peek1(uint32 addr) override;
+	bool Poke1(uint32 addr, uint32 data) override;
 
 	// RAM Control Register (RMCR) を設定/取得
 	uint32 GetRMCR() const;
@@ -42,9 +39,6 @@ class XPbusDevice : public IOContainerDe
 	// 内蔵 RAM の先頭番地を取得 (モニタ用)
 	uint32 GetXPRAMAddr() const { return ram_addr; }
 
- protected:
-	IODevice *GetDevice(uint32 addr) const override;
-
  private:
 	inline IODevice *SearchDevice(uint32 addr) const;
 
@@ -56,8 +50,8 @@ class XPbusDevice : public IOContainerDe
 	// XP 内蔵 512 バイト RAM の位置
 	uint32 ram_addr {};
 
-	IODevice *subram {};	// 共有 SRAM
-	IODevice *nopio {};
+	SubRAMDevice *subram {};	// 共有 SRAM
+	NopIODevice *nopio {};
 };
 
 // XP 内蔵 RAM
@@ -68,14 +62,10 @@ class XPRAMDevice : public IODevice
 	XPRAMDevice();
 	~XPRAMDevice() 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 Read1(uint32 addr) override;
+	busdata Write1(uint32 addr, uint32 data) override;
+	busdata Peek1(uint32 addr) override;
+	bool Poke1(uint32 addr, uint32 data) override;
 
  private:
 	std::array<uint8, 512> ram {};