--- nono/vm/dmac.cpp	2026/04/29 17:04:35	1.1.1.3
+++ nono/vm/dmac.cpp	2026/04/29 17:04:38	1.1.1.4
@@ -18,7 +18,7 @@ DMACDevice::DMACDevice()
 	devaddr = baseaddr;
 	devlen  = 0x2000;
 
-	monitor.Init(80, 30);
+	monitor_size = nnSize(80, 30);
 
 	for (int i = 0; i < countof(dmac.chan); i++) {
 		dmac.chan[i].ch = i;
@@ -475,8 +475,8 @@ DMACDevice::Peek(uint32 addr)
 	return data;
 }
 
-bool
-DMACDevice::MonitorUpdate()
+void
+DMACDevice::MonitorUpdate(TextScreen& monitor)
 {
 	int x;
 	int y;
@@ -527,8 +527,8 @@ DMACDevice::MonitorUpdate()
 		static const char * const csrname[] = {
 			"COC", "BTC", "NDT", "ERR", "ACT", "---", "PCT", "PCS",
 		};
-		MonitorReg4(x, y++, val >> 4,   &csrname[0]);
-		MonitorReg4(x, y++, val & 0xff, &csrname[4]);
+		MonitorReg4(monitor, x, y++, val >> 4,   &csrname[0]);
+		MonitorReg4(monitor, x, y++, val & 0xff, &csrname[4]);
 
 		// CER
 		val = chan->cer & 0x1f;
@@ -639,8 +639,8 @@ DMACDevice::MonitorUpdate()
 		static const char * const ccrnames[] = {
 			"STR", "CNT", "HLT", "SAB", "INT", "---", "---", "---",
 		};
-		MonitorReg4(x, y++, (val >> 4),   &ccrnames[0]);
-		MonitorReg4(x, y++, (val & 0xff), &ccrnames[4]);
+		MonitorReg4(monitor, x, y++, (val >> 4),   &ccrnames[0]);
+		MonitorReg4(monitor, x, y++, (val & 0xff), &ccrnames[4]);
 
 		// MTC
 		monitor.Print(x, y++, "$%04x", chan->mtc);
@@ -684,13 +684,12 @@ DMACDevice::MonitorUpdate()
 			monitor.Print(x - 5, y++, "GCR: $%02x", dmac.gcr);
 		}
 	}
-
-	return true;
 }
 
 // 4ビット分を表示する。MonitorUpdate の下請け
 void
-DMACDevice::MonitorReg4(int x, int y, uint32 reg, const char * const *names)
+DMACDevice::MonitorReg4(TextScreen& monitor,
+	int x, int y, uint32 reg, const char * const *names)
 {
 	for (int i = 0; i < 4; i++) {
 		bool b = reg & (1 << (3 - i));