--- nono/vm/adpcm.cpp	2026/04/29 17:05:16	1.1.1.2
+++ nono/vm/adpcm.cpp	2026/04/29 17:05:24	1.1.1.3
@@ -53,12 +53,10 @@ ADPCMDevice::ResetHard(bool poweron)
 	div = 512;
 }
 
-uint64
+busdata
 ADPCMDevice::Read(uint32 offset)
 {
-	uint8 data;
-
-	mpu->AddCycle(18);	// InsideOut p.135
+	busdata data;
 
 	switch (offset) {
 	 case 0:	// STAT
@@ -66,7 +64,7 @@ ADPCMDevice::Read(uint32 offset)
 		if (playing) {
 			data |= STAT_PLAY;
 		}
-		putlog(1, "STAT -> $%02x", data);
+		putlog(1, "STAT -> $%02x", data.Data());
 		break;
 	 case 1:	// DATA
 		putlog(0, "Read $%06x (NOT IMPLEMENTED)", mpu->GetPaddr());
@@ -76,14 +74,16 @@ ADPCMDevice::Read(uint32 offset)
 		VMPANIC("corrupted offset=%d", offset);
 	}
 
+	// InsideOut p.135
+	const busdata wait = busdata::Wait(18 * 40_nsec);
+	data |= wait;
+
 	return data;
 }
 
-uint64
+busdata
 ADPCMDevice::Write(uint32 offset, uint32 data)
 {
-	mpu->AddCycle(22);	// InsideOut p.135
-
 	switch (offset) {
 	 case 0:	// CMD
 		putlog(1, "CMD  <- $%02x", data);
@@ -109,10 +109,12 @@ ADPCMDevice::Write(uint32 offset, uint32
 		VMPANIC("corrupted offset=%d", offset);
 	}
 
-	return 0;
+	// InsideOut p.135
+	const busdata wait = busdata::Wait(22 * 40_nsec);
+	return wait;
 }
 
-uint64
+busdata
 ADPCMDevice::Peek(uint32 offset)
 {
 	// XXX 未実装