From fb4fc9e6ec11b56fa8005e69354b95f222c5dbf6 Mon Sep 17 00:00:00 2001
From: flama12333 <143599905+flama12333@users.noreply.github.com>
Date: Mon, 2 Sep 2024 06:22:05 -0500
Subject: misc/changyu2.cpp: Add PSG to sound CPU memory map (#12660)

* When the system writes 21 to 0x0c, an alarm sounds
---
 src/mame/misc/changyu.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/mame/misc/changyu.cpp b/src/mame/misc/changyu.cpp
index bfa86483213..c824ab93b9d 100644
--- a/src/mame/misc/changyu.cpp
+++ b/src/mame/misc/changyu.cpp
@@ -89,6 +89,8 @@ private:
 
 	void main_map(address_map &map);
 	void main2_map(address_map &map);
+    void prog2_map(address_map &map);
+    void ext2_map(address_map &map);
 
 	virtual void machine_start() override;
 
@@ -163,6 +165,18 @@ void changyu_state::main2_map(address_map &map)
 	map(0x6000, 0xffff).rom().region("boot_rom", 0x6000);
 }
 
+void changyu_state::prog2_map(address_map &map)
+{
+
+	map(0x0000, 0xfff).rom().region("mcu", 0);
+}
+
+
+void changyu_state::ext2_map(address_map &map)
+{
+    map(0x0502, 0x0503).w("ay", FUNC(ay8910_device::data_address_w));
+}
+
 static INPUT_PORTS_START( changyu )
 	PORT_START("IN0")
 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
@@ -265,7 +279,8 @@ void changyu_state::changyu2(machine_config &config)
 
 	I87C51(config.replace(), m_mcu, XTAL(8'000'000));
 //  m_mcu->set_disable();
-
+	m_mcu->set_addrmap(AS_PROGRAM, &changyu_state::prog2_map);
+ 	m_mcu->set_addrmap(AS_IO, &changyu_state::ext2_map);
 	YM2413(config, "ymsnd", 3.579545_MHz_XTAL).add_route(ALL_OUTPUTS, "mono", 1.0);
 }
 
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