From 2d0170471a0c7bc5eeb5e3d1388491351acfb725 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Fri, 25 Apr 2025 01:38:35 +0200
Subject: [PATCH] Add mapper 475.

---
 src/boards/475.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 71 insertions(+)
 create mode 100644 src/boards/475.c

diff --git a/src/boards/475.c b/src/boards/475.c
new file mode 100644
index 0000000..69b9b7c
--- /dev/null
+++ b/src/boards/475.c
@@ -0,0 +1,69 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2025 NewRisingSun
+ *
+ * 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
+ */
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void PRGWrap(uint32 A, uint8 V) {
+	if (EXPREGS[1] &1) {
+		if ((EXPREGS[0] &3) ==3)
+			setprg32(0x8000, EXPREGS[0] <<2 &0xC | EXPREGS[0] >>2 &0x3);
+		else
+			setprg8(A, V &0x0F | EXPREGS[0] <<4 &0xF0);
+	} else
+		setprg32(0x8000, EXPREGS[0] >>4 &0x3 | 0x10);
+}
+
+static void CHRWrap(uint32 A, uint8 V) {
+	if (EXPREGS[1] &1)
+		setchr1(A, V &0x7F | EXPREGS[0] <<7 &0x180);
+	else
+		setchr1(A, V &0x7F | 0x200);
+}
+
+static DECLFW(WriteExtra) {
+	if (EXPREGS[1] &1)
+		EXPREGS[0] =A &0xFF;
+	else
+		EXPREGS[0] =V;
+	FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static void Reset(void) {
+	EXPREGS[0] =0;
+	EXPREGS[1] ^=1;
+	MMC3RegReset();
+}
+
+static void Power(void) {
+	EXPREGS[0] =0;
+	EXPREGS[1] =0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, WriteExtra);
+}
+
+void Mapper475_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 256, 0, 0);
+	cwrap = CHRWrap;
+	pwrap = PRGWrap;
+	info->Power = Power;
+	info->Reset = Reset;
+	AddExState(EXPREGS, 2, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index dfa0970..b4b76ff 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -896,6 +896,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "830947",	          	472, Mapper472_Init         )
 	INES_BOARD( "KJ01A-18",	          	473, Mapper473_Init         )
 	INES_BOARD( "NTDEC N625231",	       	474, Mapper474_Init         )
+	INES_BOARD( "820215-C-A2",	       	475, Mapper475_Init         )
 	INES_BOARD( "045N",          		481, Mapper481_Init         )
 	INES_BOARD( "ESTIQUE",         		484, Mapper484_Init         )
 	INES_BOARD( "AVE NINA-08",    		487, Mapper487_Init         )
diff --git a/src/ines.h b/src/ines.h
index 63a2d76..8668c0e 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -375,6 +375,7 @@ void Mapper471_Init(CartInfo *);
 void Mapper472_Init(CartInfo *);
 void Mapper473_Init(CartInfo *);
 void Mapper474_Init(CartInfo *);
+void Mapper475_Init(CartInfo *);
 void Mapper481_Init(CartInfo *);
 void Mapper484_Init(CartInfo *);
 void Mapper487_Init(CartInfo *);