--- nono/m680x0/m680x0acc.cpp	2026/04/29 17:05:31	1.1.1.1
+++ nono/m680x0/m680x0acc.cpp	2026/04/29 17:05:48	1.1.1.2
@@ -343,30 +343,30 @@ m680x0ACC::muls_64(uint32 src, uint32 ds
 void
 m680x0ACC::btst(uint32 data, int n)
 {
-	Z = data & (1 << n);
+	Z = data & (1U << n);
 }
 
 uint32
 m680x0ACC::bchg(uint32 data, int n)
 {
-	Z = data & (1 << n);
-	data ^= (1 << n);
+	Z = data & (1U << n);
+	data ^= (1U << n);
 	return data;
 }
 
 uint32
 m680x0ACC::bclr(uint32 data, int n)
 {
-	Z = data & (1 << n);
-	data &= ~(1 << n);
+	Z = data & (1U << n);
+	data &= ~(1U << n);
 	return data;
 }
 
 uint32
 m680x0ACC::bset(uint32 data, int n)
 {
-	Z = data & (1 << n);
-	data |= (1 << n);
+	Z = data & (1U << n);
+	data |= (1U << n);
 	return data;
 }
 
@@ -776,7 +776,7 @@ m680x0ACC::roxr_8(uint32 data, int count
 		C = X;
 		return Z;
 	}
-	uint32 rot = data & ((1 << (count - 1)) - 1);
+	uint32 rot = data & ((1U << (count - 1)) - 1);
 	uint32 xbit = X & 1;
 	Z = (data >> count) | (rot << (9 - count)) | (xbit << (8 - count));
 	C = X = data >> (count - 1);
@@ -798,7 +798,7 @@ m680x0ACC::roxr_16(uint32 data, int coun
 		C = X;
 		return Z;
 	}
-	uint32 rot = data & ((1 << (count - 1)) - 1);
+	uint32 rot = data & ((1U << (count - 1)) - 1);
 	uint32 xbit = X & 1;
 	Z = (data >> count) | (rot << (17 - count)) | (xbit << (16 - count));
 	C = X = data >> (count - 1);
@@ -822,7 +822,7 @@ m680x0ACC::roxr_32(uint32 data, int coun
 	}
 	// 32bit値の 32ビットシフトは未定義動作なので 64bit値を使用
 	uint64 data64 = data;
-	uint64 rot = data64 & ((1 << (count - 1)) - 1);
+	uint64 rot = data64 & ((1U << (count - 1)) - 1);
 	uint32 xbit = X & 1;
 	Z = (data64 >> count) | (rot << (33 - count)) | (xbit << (32 - count));
 	C = X = data64 >> (count - 1);