--- nono/vm/msxdos.cpp	2026/04/29 17:05:17	1.1.1.1
+++ nono/vm/msxdos.cpp	2026/04/29 17:05:21	1.1.1.2
@@ -156,16 +156,12 @@ MSXDOSDevice::Init()
 	}
 
 	// コピー
-	if (src.size >= 0x7000 - 0x100) {
-		src.size = 0x7000 - 0x100;
-	}
 	xs.SetAddr(0x100);
 	for (int i = 0; i < src.size; i++) {
 		xs.Write8(src.data[i]);
 	}
 
 	delete[] src.data;
-
 	return true;
 }
 
@@ -221,6 +217,13 @@ MSXDOSDevice::LoadBinary(const char *fil
 		}
 	}
 
+	// サイズ制限
+	if (dl.size >= 0x7000 - 0x100) {
+		errno = EFBIG;
+		warn("%s", filename);
+		return dl;
+	}
+
 	try {
 		dl.data = new uint8 [dl.size];
 	} catch (...) {