--- nono/vm/xpbus.h	2026/04/29 17:05:25	1.1.1.2
+++ nono/vm/xpbus.h	2026/04/29 17:05:50	1.1.1.5
@@ -13,10 +13,12 @@
 #include "mainbus.h"
 #include <array>
 
+class NopIODevice;
+class SubRAMDevice;
 class SubRAM2Device;
 class XPRAMDevice;
 
-// XP 外部バス
+// XP 物理バス
 class XPbusDevice : public IODevice
 {
 	using inherited = IODevice;
@@ -27,14 +29,10 @@ class XPbusDevice : public IODevice
 	bool Init() override;
 	void ResetHard(bool poweron) 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;
+	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;
@@ -53,8 +51,8 @@ class XPbusDevice : public IODevice
 	// 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
@@ -65,14 +63,10 @@ class XPRAMDevice : public IODevice
 	XPRAMDevice();
 	~XPRAMDevice() 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;
+	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 {};