--- nono/m88xx0/m88200.cpp	2026/04/29 17:05:30	1.1.1.14
+++ nono/m88xx0/m88200.cpp	2026/04/29 17:05:39	1.1.1.15
@@ -1988,10 +1988,21 @@ m88200::ReadLine(m88200CacheSet& set, ui
 
 	busaddr addr = busaddr(set.tag[line] | (set.setidx << 4)) | acc_super;
 	busdata r = mainbus->ReadBurst16(addr, &set.word[line * 4]);
-	parent->AddWait(r.GetWait());
-	if (__predict_false(r.IsBusErr())) {
-		SetFault(FAULT_CODE_BUSERR, addr.Addr());
-		return (uint64)-1;
+	if (__predict_true(r.IsBusErr() == false)) {
+		parent->AddWait(r.GetWait());
+		return 0;
+	} else {
+		addr |= BusAddr::Size4;
+		for (int i = 0; i < 4; i++) {
+			busdata bd = mainbus->Read(addr);
+			parent->AddWait(r.GetWait());
+			if (__predict_false(bd.IsBusErr())) {
+				SetFault(FAULT_CODE_BUSERR, addr.Addr());
+				return (uint64)-1;
+			}
+			set.word[line * 4 + i] = bd.Data();
+			addr += 4;
+		}
 	}
 	return 0;
 }
@@ -2004,10 +2015,19 @@ m88200::CopyBackLine(m88200CacheSet& set
 {
 	busaddr addr = busaddr(set.tag[line] | (set.setidx << 4)) | acc_super;
 	busdata r = mainbus->WriteBurst16(addr, &set.word[line * 4]);
-	parent->AddWait(r.GetWait());
-	if (__predict_false(r.IsBusErr())) {
-		SetFault(FAULT_CODE_BUSERR, addr.Addr());
-		return (uint64)-1;
+	if (__predict_true(r.IsBusErr() == false)) {
+		parent->AddWait(r.GetWait());
+		return 0;
+	} else {
+		addr |= BusAddr::Size4;
+		for (int i = 0; i < 4; i++) {
+			busdata bd = mainbus->Write(addr, set.word[line * 4 + i]);
+			if (__predict_false(bd.IsBusErr())) {
+				SetFault(FAULT_CODE_BUSERR, addr.Addr());
+				return (uint64)-1;
+			}
+			addr += 4;
+		}
 	}
 	return 0;
 }