From 094a28093fbd59d7520de211e0bc67fb8f2d625b Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Tue, 9 Sep 2025 21:27:32 +0200
Subject: [PATCH] Add mapper 536.

---
 src/boards/536.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 69 insertions(+)
 create mode 100644 src/boards/536.c

diff --git a/src/boards/536.c b/src/boards/536.c
new file mode 100644
index 0000000..935e777
--- /dev/null
+++ b/src/boards/536.c
@@ -0,0 +1,67 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2020
+ *
+ * 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
+ *
+ *
+ */
+
+/* The UNIF dump of "(JY-103) 3-in-1" (JY4M4 MAPR) has a strange bank order and will not run with this emulation. */
+
+#include "mapinc.h"
+#include "asic_mmc3.h"
+
+static uint8 reg[2];
+
+static void sync () {
+	int prg = reg[0] &0x1F | reg[0] >>1 &0x20;
+	if (reg[0] &0x80)
+		MMC3_syncPRG(0x0F, prg <<2);
+	else
+	if (reg[0] &0x20)
+		setprg32(0x8000, prg >>1);
+	else {
+		setprg16(0x8000, prg);
+		setprg16(0xC000, prg);
+	}
+	setchr8(0);
+	MMC3_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	reg[A &1] = V;
+	sync();
+}
+
+static void reset () {
+	reg[0] = 0x60;
+	reg[1] = 0x00;
+	MMC3_clear();
+}
+
+static void power () {
+	reg[0] = 0x60;
+	reg[1] = 0x00;
+	MMC3_power();
+}
+
+void Mapper536_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, writeReg);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(reg, 2, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index 490e7a5..c44aee7 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -933,6 +933,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Sachen 3014",              533, Mapper533_Init         )
 	INES_BOARD( "NJ064",                    534, Mapper534_Init         )
 	INES_BOARD( "LH53",                     535, LH53_Init              )
+	INES_BOARD( "N42S-2",                   536, Mapper536_Init         )
 	INES_BOARD( "JY4M4",                    537, Mapper537_Init         )
 	INES_BOARD( "60-1064-16L (FDS)",        538, Mapper538_Init         )
 	INES_BOARD( "Kid Ikarus (FDS)",         539, Mapper539_Init         )
diff --git a/src/ines.h b/src/ines.h
index 8a0ca24..096eee4 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -401,6 +401,7 @@ void Mapper523_Init(CartInfo *);
 void Mapper528_Init(CartInfo *);
 void Mapper533_Init(CartInfo *);
 void Mapper534_Init(CartInfo *);
+void Mapper536_Init(CartInfo *);
 void Mapper537_Init(CartInfo *);
 void Mapper538_Init(CartInfo *);
 void Mapper539_Init(CartInfo *);