--- nono/vm/mpu88xx0.cpp	2026/04/29 17:04:55	1.1.1.8
+++ nono/vm/mpu88xx0.cpp	2026/04/29 17:04:59	1.1.1.9
@@ -107,6 +107,120 @@ MPU88xx0Device::Interrupt(int level)
 	cpu->Interrupt(level);
 }
 
+// DOS call エミュレーションのコールバックを指定
+void
+MPU88xx0Device::SetFLineCallback(bool (*callback)(m88kcpu *, void *), void *arg)
+{
+	cpu->SetFLineCallback(callback, arg);
+}
+
+// MPU からのアクセスをエミュレート
+uint64
+MPU88xx0Device::Read8(uint32 addr)
+{
+	return cpu->cmmu[1].load_8(addr);
+}
+
+uint64
+MPU88xx0Device::Read16(uint32 addr)
+{
+	if ((addr & 1) == 0) {
+		return cpu->cmmu[1].load_16(addr);
+	} else {
+		uint64 h, l;
+		h = Read8(addr);
+		if ((int64)h < 0) {
+			return h;
+		}
+		l = Read8(addr + 1);
+		if ((int64)l < 0) {
+			return l;
+		}
+		return (h << 8) | l;
+	}
+}
+
+uint64
+MPU88xx0Device::Read32(uint32 addr)
+{
+	if ((addr & 3) == 0) {
+		return cpu->cmmu[1].load_32(addr);
+	} else if ((addr & 1) == 0) {
+		uint64 h, l;
+		h = Read16(addr);
+		if ((int64)h < 0) {
+			return h;
+		}
+		l = Read16(addr + 2);
+		if ((int64)l < 0) {
+			return l;
+		}
+		return (h << 16) | l;
+	} else {
+		uint64 h, m, l;
+		h = Read8(addr);
+		if ((int64)h < 0) {
+			return h;
+		}
+		m = Read16(addr + 1);
+		if ((int64)m < 0) {
+			return m;
+		}
+		l = Read8(addr + 3);
+		if ((int64)l < 0) {
+			return l;
+		}
+		return (h << 24) | (m << 8) | l;
+	}
+}
+
+uint64
+MPU88xx0Device::Write8(uint32 addr, uint32 data)
+{
+	return cpu->cmmu[1].store_8(addr, data & 0xff);
+}
+
+uint64
+MPU88xx0Device::Write16(uint32 addr, uint32 data)
+{
+	if ((addr & 1) == 0) {
+		return cpu->cmmu[1].store_16(addr, data & 0xffff);
+	} else {
+		uint64 r;
+		r = Write8(addr, data >> 8);
+		if ((int64)r < 0) {
+			return r;
+		}
+		return Write8(addr + 1, data);
+	}
+}
+
+uint64
+MPU88xx0Device::Write32(uint32 addr, uint32 data)
+{
+	if ((addr & 3) == 0) {
+		return cpu->cmmu[1].store_32(addr, data);
+	} else if ((addr & 1) == 0) {
+		uint64 r;
+		r = Write16(addr, data >> 16);
+		if ((int64)r < 0) {
+			return r;
+		}
+		return Write16(addr + 2, data);
+	} else {
+		uint64 r;
+		r = Write8(addr, data >> 24);
+		if ((int64)r < 0) {
+			return r;
+		}
+		r = Write16(addr + 1, data >> 8);
+		if ((int64)r < 0) {
+			return r;
+		}
+		return Write8(addr + 3, data);
+	}
+}
+
 // モニター更新
 void
 MPU88xx0Device::MonitorUpdate(Monitor *, TextScreen& screen)