--- nono/vm/mainbus_virt68k.h	2026/04/29 17:05:24	1.1
+++ nono/vm/mainbus_virt68k.h	2026/04/29 17:05:28	1.1.1.2
@@ -5,23 +5,32 @@
 //
 
 //
-// メインバス (virt68k)
+// メインバス (virt-m68k)
 //
 
 #pragma once
 
 #include "mainbus.h"
 
-class Virt68kMainbus : public Mainbus24Device
+class Virt68kMainbus : public MainbusDevice
 {
-	using inherited = Mainbus24Device;
+	using inherited = MainbusDevice;
  public:
 	Virt68kMainbus();
 	~Virt68kMainbus() override;
 
 	bool InitMainbus() override;
 
+	busdata Read(busaddr addr) override;
+	busdata Write(busaddr addr, uint32 data) override;
+	busdata ReadBurst16(busaddr addr, uint32 *dst) override;
+	busdata WriteBurst16(busaddr addr, const uint32 *dst) override;
+	busdata Peek1(uint32 addr) override;
+	bool Poke1(uint32 addr, uint32 data) override;
+
  private:
+	inline IODevice *Decoder(uint32) const;
+
 	// ブートページを切り替える。
 	void SwitchBootPage(bool isrom) override;
 
@@ -29,4 +38,6 @@ class Virt68kMainbus : public Mainbus24D
 	std::unique_ptr<IODevice> pInterrupt {};
 	std::unique_ptr<IODevice> pMainRAM {};
 	std::unique_ptr<IODevice> pV68kIO {};
+
+	uint32 ramsize {};
 };