--- nono/vm/mk48t02.cpp	2026/04/29 17:05:18	1.1.1.13
+++ nono/vm/mk48t02.cpp	2026/04/29 17:05:25	1.1.1.14
@@ -159,18 +159,19 @@ MK48T02Device::BCD2num(uint8 bcd)
 	return (bcd >> 4) * 10 + (bcd & 0x0f);
 }
 
-uint64
+busdata
 MK48T02Device::Read(uint32 offset)
 {
-	uint32 data;
+	busdata data;
 
 	data = mem[offset];
-	putlog(3, "$%08x -> $%02x", mpu->GetPaddr(), data);
+	putlog(3, "$%08x -> $%02x", mpu->GetPaddr(), data.Data());
 
+	// XXX wait?
 	return data;
 }
 
-uint64
+busdata
 MK48T02Device::Write(uint32 offset, uint32 data)
 {
 	putlog(3, "$%08x <- $%02x", mpu->GetPaddr(), data);
@@ -208,26 +209,27 @@ MK48T02Device::Write(uint32 offset, uint
 
 	mem[offset] = data;
 
+	// XXX wait?
 	return 0;
 }
 
-uint64
+busdata
 MK48T02Device::Peek(uint32 offset)
 {
 	return mem[offset];
 }
 
-uint64
+bool
 MK48T02Device::Poke(uint32 offset, uint32 data)
 {
 	// 時計部分にはコントロールレジスタもあるので書き込み不可。
 	if (offset >= 2040) {
-		return (uint64)-1;
+		return false;
 	} else {
 		if ((int32)data >= 0) {
 			mem[offset] = data;
 		}
-		return 0;
+		return true;
 	}
 }