--- nono/vm/crtc2.cpp	2026/04/29 17:05:17	1.1.1.10
+++ nono/vm/crtc2.cpp	2026/04/29 17:05:24	1.1.1.11
@@ -57,7 +57,7 @@ CRTC2Device::ResetHard(bool poweron)
 	scheduler->RestartEvent(vdisp_event);
 }
 
-uint64
+busdata
 CRTC2Device::Read(uint32 offset)
 {
 	uint32 data;
@@ -97,17 +97,20 @@ CRTC2Device::Read(uint32 offset)
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
 	}
-	return data;
+
+	busdata bd = data;
+	// XXX wait?
+	return bd;
 }
 
-uint64
+busdata
 CRTC2Device::Write(uint32 offset, uint32 data)
 {
 	switch (offset) {
 	 case 0:	// アドレスレジスタ
 		ar = data & 0x3f;
 		putlog(3, "Address Register <- $%02x", ar);
-		return 0;
+		break;
 
 	 case 1:	// データレジスタ
 		switch (ar) {
@@ -125,14 +128,18 @@ CRTC2Device::Write(uint32 offset, uint32
 			putlog(2, "R%02d <- $%02x", ar, data);
 			break;
 		}
-		return 0;
+		break;
 
 	 default:
 		VMPANIC("corrupted offset=%d", offset);
+		break;
 	}
+
+	// XXX wait?
+	return 0;
 }
 
-uint64
+busdata
 CRTC2Device::Peek(uint32 offset)
 {
 	switch (offset) {