--- nono/vm/xpbus.h	2026/04/29 17:05:29	1.1.1.3
+++ nono/vm/xpbus.h	2026/04/29 17:05:50	1.1.1.5
@@ -13,11 +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;