Add mapper 618.

src/boards/618.c

@@ -0,0 +1,68 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2026 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 "asic_mmc3.h"
+
+static uint8 reg;
+
+static void sync () {
+	if (reg &0x02)
+		MMC3_syncPRG(0x0F, reg >>1 &0x20 | reg <<2 &0x10);
+	else
+		setprg32(0x8000, reg >>3 &0x08 | reg &0x04 | reg >>4 &0x01 | reg <<1 &0x02);
+	if (reg &0x80)
+		MMC3_syncCHR(0x1FF, 0x200);
+	else
+		MMC3_syncCHR(0x0FF, reg <<6 &0x100);	
+	MMC3_syncMirror();
+}
+
+static int getCHRBank (uint8 bank) {
+	if (reg &0x80)
+		return MMC3_getCHRBank(bank &4 | bank >>1 &1) <<1 | bank &1;
+	else
+		return MMC3_getCHRBank(bank);
+}
+
+
+static DECLFW (writeReg) {
+	reg = V;
+	sync();
+}
+
+static void reset () {
+	reg = 0;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC3_power();
+}
+
+void Mapper618_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_SHARP, NULL, getCHRBank, NULL, writeReg);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+}

src/ines.c

@@ -1034,6 +1034,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "New Star 9135",            614, Mapper614_Init         )
 	INES_BOARD( "LB12in1",                  615, Mapper615_Init         )
 	INES_BOARD( "K-3044",                   616, Mapper616_Init         )
+	INES_BOARD( "FC 4-in-1 (NS32)",         618, Mapper618_Init         )
 INES_BOARD_END()
 
 static uint32 iNES_get_mapper_id(void)

src/ines.h

@@ -503,6 +503,7 @@ void Mapper613_Init(CartInfo *);
 void Mapper614_Init(CartInfo *);
 void Mapper615_Init(CartInfo *);
 void Mapper616_Init(CartInfo *);
+void Mapper618_Init(CartInfo *);
 void FFE_Init(CartInfo *);
 
 #endif