--- nono/vm/sysport.cpp	2026/04/29 17:05:24	1.1.1.12
+++ nono/vm/sysport.cpp	2026/04/29 17:05:28	1.1.1.13
@@ -65,49 +65,19 @@ SysportDevice::ResetHard(bool poweron)
 }
 
 busdata
-SysportDevice::Read(uint32 offset)
+SysportDevice::ReadPort(uint32 offset)
 {
-	uint32 data;
+	busdata data;
 
-	switch (offset) {
-	 case SYSPORT::CONTRAST:
-		data = 0xf0 | videoctlr->GetContrast();
-		break;
-	 case SYSPORT::SCOPE3D:
-		data = 0xff;
-		break;
-	 case SYSPORT::IMAGEUNIT:
-		data = 0xff;
-		break;
-	 case SYSPORT::KEY:
-		// XXX bit3 以外は要実機確認
-		data = 0xf7;
-		if (keyboard->IsConnected()) {
-			data |= 0x08;
-		}
-		break;
-	 case SYSPORT::WAIT:
-		data = 0xff;
-		break;
-	 case SYSPORT::MPU:
-		data = 0xdc;
-		break;
-	 case SYSPORT::SRAMWP:
-		data = 0xff;
-		break;
-	 case SYSPORT::POWEROFF:
-		data = 0xff;
-		break;
-	 default:
-		VMPANIC("corrupted offset=%d", offset);
-		return 0xff;
-	}
-	putlog(2, "$%06x -> $%02x", mpu->GetPaddr(), data);
+	data = PeekPort(offset);
+	putlog(2, "$%06x -> $%02x", mpu->GetPaddr(), data.Data());
+
+	data |= BusData::Size1;
 	return data;
 }
 
 busdata
-SysportDevice::Write(uint32 offset, uint32 data)
+SysportDevice::WritePort(uint32 offset, uint32 data)
 {
 	switch (offset) {
 	 case SYSPORT::CONTRAST:
@@ -181,7 +151,7 @@ SysportDevice::Write(uint32 offset, uint
 		} else {
 			sysport.pwoff_count = 0;
 		}
-		putlog(2, "$e8e00f (POWEROFF) <- %02x (count=%d)",
+		putlog(2, "$e8e00f (POWEROFF) <- %02x (count=%u)",
 			data, sysport.pwoff_count);
 		if (sysport.pwoff_count == sig.size()) {
 			// pwoff_count はここではクリアせず、電源オン時に再初期化する。
@@ -192,14 +162,16 @@ SysportDevice::Write(uint32 offset, uint
 	 }
 
 	 default:
-		VMPANIC("corrupted offset=%d", offset);
+		VMPANIC("corrupted offset=%u", offset);
 		break;
 	}
-	return 0;
+
+	busdata r = BusData::Size1;
+	return r;
 }
 
 busdata
-SysportDevice::Peek(uint32 offset)
+SysportDevice::PeekPort(uint32 offset)
 {
 	uint32 data;
 
@@ -239,6 +211,12 @@ SysportDevice::Peek(uint32 offset)
 	return data;
 }
 
+bool
+SysportDevice::PokePort(uint32 offset, uint32 data)
+{
+	return false;
+}
+
 void
 SysportDevice::MonitorUpdate(Monitor *, TextScreen& screen)
 {
@@ -260,19 +238,19 @@ SysportDevice::MonitorUpdate(Monitor *,
 	for (int i = 0; i < 8; i++) {
 		char hex[4];
 		if ((disphex & (1U << i)) != 0) {
-			val[i] = Peek(i);
+			val[i] = PeekPort(i);
 			snprintf(hex, sizeof(hex), "%02x", val[i]);
 		} else {
 			strlcpy(hex, "--", sizeof(hex));
 		}
 
-		screen.Print(0, i, "$%06x %s: #%d %-17s:",
+		screen.Print(0, i, "$%06x %s: #%u %-17s:",
 			baseaddr + 1 + i * 2, hex, i, name[i]);
 	}
 
 	int x = 34;
 	// #0 Contrast
-	screen.Print(x, 0, "%2d", videoctlr->GetContrast());
+	screen.Print(x, 0, "%2u", videoctlr->GetContrast());
 	screen.Puts(x, 1, "(Not Supported)");
 	screen.Puts(x, 2, "(Not Supported)");
 	// #3 Keyboard
@@ -293,5 +271,5 @@ SysportDevice::MonitorUpdate(Monitor *,
 		screen.Puts(x, 6, "Protected");
 	}
 	// #7 PowerOff
-	screen.Print(x, 7, "%d/3", sysport.pwoff_count);
+	screen.Print(x, 7, "%u/3", sysport.pwoff_count);
 }