--- nono/vm/iodevstream.cpp	2026/04/29 17:05:28	1.1
+++ nono/vm/iodevstream.cpp	2026/04/29 17:05:41	1.1.1.2
@@ -19,18 +19,18 @@ IODeviceStream::~IODeviceStream()
 busdata
 IODeviceStream::ReadN(busaddr size)
 {
-	busaddr addr = busaddr(offset) | size | BusAddr::SRead;
+	busaddr ba = busaddr(addr) | size | BusAddr::SRead;
 	busdata data;
 
 	do {
-		busdata bd = dev->Read(addr);
+		busdata bd = dev->Read(ba);
 		if (__predict_false(bd.IsBusErr())) {
 			return bd;
 		}
-		data |= MainbusDevice::DYNAMIC_BUS_SIZING_R(addr, bd);
-	} while (addr.GetSize() != 0);
+		data |= MainbusDevice::DYNAMIC_BUS_SIZING_R(ba, bd);
+	} while (ba.GetSize() != 0);
 
-	offset += size.GetSize();
+	addr += size.GetSize();
 	data |= busdata(size.Get());
 	return data;
 }
@@ -40,16 +40,16 @@ IODeviceStream::ReadN(busaddr size)
 busdata
 IODeviceStream::WriteN(busaddr size, uint32 data)
 {
-	busaddr addr = busaddr(offset) | size | BusAddr::SWrite;
+	busaddr ba = busaddr(addr) | size | BusAddr::SWrite;
 	do {
-		busdata r = dev->Write(addr, data);
+		busdata r = dev->Write(ba, data);
 		if (__predict_false(r.IsBusErr())) {
 			return r;
 		}
-		MainbusDevice::DYNAMIC_BUS_SIZING_W(addr, data, r);
-	} while (addr.GetSize() != 0);
+		MainbusDevice::DYNAMIC_BUS_SIZING_W(ba, data, r);
+	} while (ba.GetSize() != 0);
 
-	offset += size.GetSize();
+	addr += size.GetSize();
 	return 0;
 }
 
@@ -59,8 +59,8 @@ IODeviceStream::WriteMem(const void *src
 {
 	auto mainram = dynamic_cast<MainRAMDevice *>(dev);
 	if (mainram) {
-		mainram->WriteMem(offset, src, len);
-		offset += len;
+		mainram->WriteMem(addr, src, len);
+		addr += len;
 	} else {
 		const uint8 *s = (const uint8 *)src;
 		for (int i = 0; i < len; i++) {