--- nono/vm/printer.cpp	2026/04/29 17:04:28	1.1
+++ nono/vm/printer.cpp	2026/04/29 17:04:42	1.1.1.3
@@ -1,9 +1,11 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #include "printer.h"
+#include "mpu.h"
 
 PrinterDevice::PrinterDevice()
 {
@@ -21,6 +23,7 @@ uint64
 PrinterDevice::Read8(uint32 addr)
 {
 	// 書き込み専用
+	gMPU->AddCycle(7);	// InsideOut p.135
 	return (uint64)-1;
 }
 
@@ -28,12 +31,15 @@ uint64
 PrinterDevice::Read16(uint32 addr)
 {
 	// 書き込み専用
+	gMPU->AddCycle(7);	// InsideOut p.135
 	return (uint64)-1;
 }
 
 uint64
 PrinterDevice::Write8(uint32 addr, uint32 data)
 {
+	gMPU->AddCycle(7);	// InsideOut p.135
+
 	uint32 offset = addr - baseaddr;
 	switch (offset) {
 	 case 0: