--- nono/vm/sio.cpp	2026/04/29 17:05:17	1.1.1.11
+++ nono/vm/sio.cpp	2026/04/29 17:05:24	1.1.1.12
@@ -135,10 +135,10 @@ SIODevice::ResetChannel(MPSCCChan& chan)
 	ResetChannelCommon(chan);
 }
 
-uint64
+busdata
 SIODevice::Read(uint32 offset)
 {
-	uint64 data;
+	busdata data;
 
 	switch (offset) {
 	 case 0:
@@ -156,10 +156,11 @@ SIODevice::Read(uint32 offset)
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+	// XXX wait?
 	return data;
 }
 
-uint64
+busdata
 SIODevice::Write(uint32 offset, uint32 data)
 {
 	switch (offset) {
@@ -178,10 +179,11 @@ SIODevice::Write(uint32 offset, uint32 d
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
+	// XXX wait?
 	return 0;
 }
 
-uint64
+busdata
 SIODevice::Peek(uint32 offset)
 {
 	uint64 data;