From bc8767ef2616510e4b296ba7d84fa25bb1c41a84 Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Sun, 6 Feb 2022 18:05:36 +0800
Subject: [PATCH] Add mapper 396

---
 src/boards/396.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 src/unif.c       |  1 +
 4 files changed, 76 insertions(+)
 create mode 100644 src/boards/396.c

diff --git a/src/boards/396.c b/src/boards/396.c
new file mode 100644
index 0000000..5b58694
--- /dev/null
+++ b/src/boards/396.c
@@ -0,0 +1,73 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2022 negativeExponent
+ *
+ * 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 396 - BMC-830752C
+ * 1995 Super 8-in-1 (JY-050 rev0)
+ * Super 8-in-1 Gold Card Series (JY-085)
+ * Super 8-in-1 Gold Card Series (JY-086)
+ * 2-in-1 (GN-51)
+ */
+
+#include "mapinc.h"
+
+static uint8 reg[2];
+
+static void Sync (void) {
+	setprg16(0x8000, reg[1] << 3 | reg[0] & 7);
+	setprg16(0xC000, reg[1] << 3 | 7);
+	setchr8(0);
+	setmirror(((reg[0] >> 6) & 1) ^ 1);
+}
+
+static DECLFW(M396WriteInnerBank) {
+	reg[0] = V;
+	Sync();
+}
+
+static DECLFW(M396WriteOuterBank) {
+	reg[1] = V;
+	Sync();
+}
+
+static void M396Reset(void) {
+	reg[0] = 0x00;
+	reg[1] = 0x00;
+	Sync();
+}
+
+static void StateRestore(void) {
+	Sync();
+}
+
+static void M396Power(void) {
+	reg[0] = 0x00;
+	reg[1] = 0x00;
+	Sync();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0x9FFF, M396WriteInnerBank);
+	SetWriteHandler(0xA000, 0xBFFF, M396WriteOuterBank);
+	SetWriteHandler(0xC000, 0xFFFF, M396WriteInnerBank);
+}
+
+void Mapper396_Init(CartInfo *info) {
+	info->Power = M396Power;
+	info->Reset = M396Reset;
+	GameStateRestore = StateRestore;
+	AddExState(reg, 2, 0, "REGS");
+}
diff --git a/src/ines.c b/src/ines.c
index e75a052..4d89bab 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -792,6 +792,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "YY850735C",                387, Mapper387_Init         )
 	INES_BOARD( "YY850835C",                388, Mapper388_Init         )
 	INES_BOARD( "BS-110",                   391, Mapper391_Init         )
+    INES_BOARD( "YY850437C",                396, Mapper396_Init         )
 	INES_BOARD( "YY850439C",                397, Mapper397_Init         )
 	INES_BOARD( "831019C J-2282",           402, J2282_Init             )
 	INES_BOARD( "SC871115C",                421, Mapper421_Init         )
diff --git a/src/ines.h b/src/ines.h
index 0e95552..5874029 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -284,6 +284,7 @@ void Mapper389_Init(CartInfo *);
 void Mapper390_Init(CartInfo *);
 void Mapper391_Init(CartInfo *);
 void Mapper395_Init(CartInfo *);
+void Mapper396_Init(CartInfo *);
 void Mapper397_Init(CartInfo *);
 void Mapper401_Init(CartInfo *);
 void Mapper403_Init(CartInfo *);
diff --git a/src/unif.c b/src/unif.c
index c6dc25c..5ce0560 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -616,6 +616,7 @@ static BMAPPING bmap[] = {
 	{ "SB-5013",                    359, Mapper359_Init,        0 },
 	{ "82112C",                     540, Mapper540_Init,        0 },
 	{ "N49C-300",                   369, Mapper369_Init,        0 },
+	{ "830752C",                    396, Mapper396_Init,        0 },
 
 	{ "BS-400R",                    422, Mapper422_Init,        0 },
 	{ "BS-4040R",                   422, Mapper422_Init,        0 },