From eb37ca21ed03676c6fb38ccc328e9fd641e08ed8 Mon Sep 17 00:00:00 2001
From: libretroadmin <reallibretroretroarch@gmail.com>
Date: Sun, 9 Jun 2024 18:32:06 +0200
Subject: [PATCH] Add mapper 453

---
 src/boards/453.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 59 insertions(+)
 create mode 100644 src/boards/453.c

diff --git a/src/boards/453.c b/src/boards/453.c
new file mode 100644
index 00000000..db533fde
--- /dev/null
+++ b/src/boards/453.c
@@ -0,0 +1,57 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+/* NES 2.0 Mapper 453 - Realtec 8042
+ * 3-in-1 1995 World Competitive Champion Edition (DG-002)
+ */
+
+#include "mapinc.h"
+#include "latch.h"
+
+static void Sync(void) {
+	setchr8(0);
+	if (latch.data & 0x40) {
+		setprg32(0x8000, ((latch.data >> 3) & 0x18) |  (latch.data & 7));
+	} else {
+		setprg16(0x8000, (((latch.data >> 2) & 0x38) | latch.data & 7));
+		setprg16(0xC000, (latch.data >> 2 & 0x38) | 7);
+	}
+    setmirror(((latch.data >> 5) & 2) + (((latch.data >> 4) & 1) ^ 1));
+}
+
+static DECLFW(M453WriteLatch) {
+    if (latch.data & 0xE0)
+		latch.data = (latch.data & 0xE0) | (V & ~0xE0);
+    else
+		latch.data = V;
+    Sync();
+}
+
+static void M453Power(void) {
+    LatchPower();
+    SetWriteHandler(0x8000, 0xFFFF, M453WriteLatch);
+}
+
+void Mapper453_Init(CartInfo *info) {
+	Latch_Init(info, Sync, NULL, 0, 0);
+	info->Power = M453Power;
+	info->Reset = LatchHardReset;
+}
diff --git a/src/ines.c b/src/ines.c
index cdbdd446..1f679267 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -828,6 +828,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "830768C",                  448, Mapper448_Init         )
 	INES_BOARD( "22-in-1 King Series",      449, Mapper449_Init         )
 	INES_BOARD( "DS-9-27",                  452, Mapper452_Init         )
+	INES_BOARD( "Realtec 8042",    		453, Mapper453_Init         )
 	INES_BOARD( "N625836",                  455, Mapper455_Init         )
 	INES_BOARD( "K6C3001A",                 456, Mapper456_Init         )
 	INES_BOARD( "8-in-1",                   459, Mapper459_Init         )
diff --git a/src/ines.h b/src/ines.h
index 88ead239..af91dd92 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -337,6 +337,7 @@ void Mapper444_Init(CartInfo *);
 void Mapper448_Init(CartInfo *);
 void Mapper449_Init(CartInfo *);
 void Mapper452_Init(CartInfo *);
+void Mapper453_Init(CartInfo *);
 void Mapper455_Init(CartInfo *);
 void Mapper456_Init(CartInfo *);
 void Mapper459_Init(CartInfo *);