--- nono/vm/pio.h	2026/04/29 17:05:29	1.1.1.13
+++ nono/vm/pio.h	2026/04/29 17:05:33	1.1.1.14
@@ -11,7 +11,6 @@
 #pragma once
 
 #include "device.h"
-#include "monitor.h"
 #include <array>
 
 class InterruptDevice;
@@ -143,7 +142,7 @@ class PIO0Device : public i8255Device
 	bool parity {};			// $40 パリティ有効/無効
 	bool xp_reset {};		// $80 XP リセット
 
-	Monitor monitor { this };
+	Monitor *monitor {};
 
 	InterruptDevice *interrupt {};
 	PIO1Device *pio1 {};