--- nono/vm/mk48t02.cpp	2026/04/29 17:04:36	1.1.1.4
+++ nono/vm/mk48t02.cpp	2026/04/29 17:04:39	1.1.1.5
@@ -23,7 +23,7 @@ MK48T02Device::MK48T02Device()
 	logname = "mk48t02";
 	devname = "MK48T02";
 	devaddr = 0x45000000;
-	monitor.Init(25, 2);
+	monitor_size = nnSize(25, 2);
 }
 
 MK48T02Device::~MK48T02Device()
@@ -228,8 +228,8 @@ MK48T02Device::Peek(uint32 addr)
 	}
 }
 
-bool
-MK48T02Device::MonitorUpdate()
+void
+MK48T02Device::MonitorUpdate(TextScreen& monitor)
 {
 	monitor.Clear();
 
@@ -245,8 +245,6 @@ MK48T02Device::MonitorUpdate()
 		rtc.year, rtc.mon, rtc.mday, wdays[rtc.wday]);
 	monitor.Print(10, 1, "%02d:%02d:%02d",
 		rtc.hour, rtc.min, rtc.sec);
-
-	return true;
 }
 
 // コントロールレジスタへの書き込み