--- nono/vm/rom.cpp	2026/04/29 17:04:59	1.1.1.7
+++ nono/vm/rom.cpp	2026/04/29 17:05:10	1.1.1.9
@@ -4,8 +4,10 @@
 // Licensed under nono-license.txt
 //
 
-// ROM の共通部分
 //
+// ROM の基本クラス
+//
+
 // IODevice
 //    |
 //    |  +-----------+
@@ -93,7 +95,6 @@ ROMDevice::LoadROM(const char *name, int
 		// 大きすぎるほうはワーニングだけでいいか
 		warnx("%s is too large (ignore %zd bytes)",
 			filename.c_str(), (ssize_t)st.st_size - size);
-		return false;
 	}
 
 	// 読み込む
@@ -117,7 +118,10 @@ uint64
 ROMDevice::Read8(uint32 addr)
 {
 	gMPU->AddCycle(wait);
-	return mem[addr & mask];
+	uint32 data;
+	data = mem[addr & mask];
+	putlog(4, "$%08x.B -> $%02x", addr, data);
+	return data;
 }
 
 uint64
@@ -125,8 +129,9 @@ ROMDevice::Read16(uint32 addr)
 {
 	gMPU->AddCycle(wait);
 	uint16 data;
-	data = *(uint16 *)&mem[addr & mask];
-	return be16toh(data);
+	data = be16toh(*(uint16 *)&mem[addr & mask]);
+	putlog(4, "$%08x.W -> $%04x", addr, data);
+	return data;
 }
 
 uint64
@@ -134,14 +139,16 @@ ROMDevice::Read32(uint32 addr)
 {
 	gMPU->AddCycle(wait);
 	uint32 data;
-	data = *(uint32 *)&mem[addr & mask];
-	return be32toh(data);
+	data = be32toh(*(uint32 *)&mem[addr & mask]);
+	putlog(4, "$%08x.L -> $%08x", addr, data);
+	return data;
 }
 
 uint64
 ROMDevice::Write8(uint32 addr, uint32 data)
 {
 	gMPU->AddCycle(wait);	// ?
+	putlog(4, "$%08x.B <- $%02x", addr, data);
 	return write_op;
 }
 
@@ -149,6 +156,7 @@ uint64
 ROMDevice::Write16(uint32 addr, uint32 data)
 {
 	gMPU->AddCycle(wait);	// ?
+	putlog(4, "$%08x.W <- $%04x", addr, data);
 	return write_op;
 }
 
@@ -156,6 +164,7 @@ uint64
 ROMDevice::Write32(uint32 addr, uint32 data)
 {
 	gMPU->AddCycle(wait);	// ?
+	putlog(4, "$%08x.L <- $%08x", addr, data);
 	return write_op;
 }