--- nono/vm/pio.cpp	2026/04/29 17:05:18	1.1.1.12
+++ nono/vm/pio.cpp	2026/04/29 17:05:25	1.1.1.13
@@ -143,6 +143,9 @@ i8255Device::MonitorUpdateCommon(TextScr
 // X68k PPI
 //
 
+// InsideOut p.135
+static const busdata ppi_wait = busdata::Wait(19 * 40_nsec);
+
 // コンストラクタ
 PPIDevice::PPIDevice()
 	: inherited(OBJ_PPI)
@@ -154,31 +157,35 @@ PPIDevice::~PPIDevice()
 {
 }
 
-uint64
+busdata
 PPIDevice::Read(uint32 offset)
 {
-	mpu->AddCycle(19);	// InsideOut p.135
+	busdata data;
 
 	switch (offset) {
 	 case 0:
 	 case 1:
-		return 0xff;
+		data = 0xff;
+		break;
 	 case 2:
 		putlog(0, "Read $e9a005 PortC (NOT IMPLEMENTED)");
-		return 0xff;
+		data = 0xff;
+		break;
 	 case 3:
 		putlog(0, "Read $e9a007 Ctrl (NOT IMPLEMENTED)");
-		return 0xff;
+		data = 0xff;
+		break;
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+
+	data |= ppi_wait;
+	return data;
 }
 
-uint64
+busdata
 PPIDevice::Write(uint32 offset, uint32 data)
 {
-	mpu->AddCycle(19);	// InsideOut p.135
-
 	switch (offset) {
 	 case 0:
 	 case 1:
@@ -195,10 +202,10 @@ PPIDevice::Write(uint32 offset, uint32 d
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
-	return 0;
+	return ppi_wait;
 }
 
-uint64
+busdata
 PPIDevice::Peek(uint32 offset)
 {
 	// XXX
@@ -359,7 +366,7 @@ PIO0Device::ResetHard(bool poweron)
 	}
 }
 
-uint64
+busdata
 PIO0Device::Read(uint32 offset)
 {
 	uint32 data;
@@ -374,7 +381,7 @@ PIO0Device::Read(uint32 offset)
 		ChangeInterrupt();
 
 		putlog(1, "DIP-SW1 -> $%02x", data);
-		return data;
+		break;
 
 	 case 1:
 		// PortB
@@ -385,49 +392,55 @@ PIO0Device::Read(uint32 offset)
 		ChangeInterrupt();
 
 		putlog(1, "DIP-SW2 -> $%02x", data);
-		return data;
+		break;
 
 	 case 2:
 		// PortC
 		data = GetPC();
 		putlog(1, "PortC -> $%02x", data);
-		return data;
+		break;
 
 	 case 3:
 		data = ReadCtrl();
 		putlog(1, "Ctrl -> $%02x", data);
-		return data;
+		break;
 
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+
+	// XXX wait?
+	return data;
 }
 
-uint64
+busdata
 PIO0Device::Write(uint32 offset, uint32 data)
 {
 	switch (offset) {
 	 case 0:	// PIO0 PortA: DIPSW1 (入力のみ)
 	 case 1:	// PIO0 PortB: DIPSW2 (入力のみ)
-		return 0;
+		break;
 
 	 case 2:	// PIO0 PortC: ホスト割り込み制御
 		for (int i = 0; i < 8; i++) {
 			SetPC(i, data & 1);
 			data >>= 1;
 		}
-		return 0;
+		break;
 
 	 case 3:	// コントロール
 		WriteCtrl(data);
-		return 0;
+		break;
 
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+
+	// XXX wait?
+	return 0;
 }
 
-uint64
+busdata
 PIO0Device::Peek(uint32 offset)
 {
 	switch (offset) {
@@ -664,7 +677,7 @@ PIO1Device::ResetHard(bool poweron)
 	powerdev->SetSystemPowerOn(false);
 }
 
-uint64
+busdata
 PIO1Device::Read(uint32 offset)
 {
 	uint32 data;
@@ -672,11 +685,13 @@ PIO1Device::Read(uint32 offset)
 	switch (offset) {
 	 case 0:
 		// PIO1 PortA: LCD データ
-		return lcd->Read();
+		data = lcd->Read();
+		break;
 
 	 case 1:
 		// PIO1 PortB: 無効
-		return 0xff;
+		data = 0xff;
+		break;
 
 	 case 2:
 		// PortC
@@ -685,49 +700,55 @@ PIO1Device::Read(uint32 offset)
 		// 残りのビットは %1 だろうか?
 		data |= 0x0d;
 		putlog(1, "PortC -> $%02x", data);
-		return data;
+		break;
 
 	 case 3:
 		data = ReadCtrl();
 		putlog(1, "Ctrl -> $%02x", data);
-		return data;
+		break;
 
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+
+	// XXX wait?
+	return data;
 }
 
-uint64
+busdata
 PIO1Device::Write(uint32 offset, uint32 data)
 {
 	switch (offset) {
 	 case 0:	// PIO1 PortA: LCD データ
 		lcd->Write(data);
-		return 0;
+		break;
 
 	 case 1:	// PIO1 PortB: XP の INT0 をアサート
 		// データ不問でアサートする。
 		putlog(1, "Assert XP INT0");
 		mpu64180->AssertINT0();
-		return 0;
+		break;
 
 	 case 2:	// PIO1 PortC: LCD/パワーオフ制御
 		for (int i = 0; i < 8; i++) {
 			SetPC(i, data & 1);
 			data >>= 1;
 		}
-		return 0;
+		break;
 
 	 case 3:	// コントロール
 		WriteCtrl(data);
-		return 0;
+		break;
 
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+
+	// XXX wait?
+	return 0;
 }
 
-uint64
+busdata
 PIO1Device::Peek(uint32 offset)
 {
 	switch (offset) {