Added mapper 478 (based on a single cartridge, so subject to change).

src/boards/478.c

@@ -0,0 +1,80 @@
+/* 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
+ */
+
+/* WE7HGX. Very preliminary. */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void PRGWrap(uint32 A, uint8 V) {
+	int prgAND =EXPREGS[0] &8 && EXPREGS[0] &4? 0x03: 0x0F;
+	setprg8(A, V &prgAND | EXPREGS[0] <<2 &~prgAND);
+}
+
+static void CHRWrap(uint32 A, uint8 V) {
+	int chrAND =EXPREGS[0] &8 && EXPREGS[0] &4? 0x1F: 0x7F;
+	setchr1(A, V &chrAND | EXPREGS[0] << 5&~chrAND);
+}
+
+static DECLFW(WriteReg) {
+	if (EXPREGS[1] &0x60) {
+		EXPREGS[0] =A &0xFF;
+		EXPREGS[1] =V;
+		FixMMC3PRG(MMC3_cmd);
+		FixMMC3CHR(MMC3_cmd);
+	}
+}
+
+static DECLFW(WriteASIC) {
+	if (EXPREGS[1] &0x80) {
+		if (A &0x4000)
+			MMC3_IRQWrite(A, V);
+		else
+			MMC3_CMDWrite(A, V);
+	} else {
+		int i;
+		for (i =0; i <6; i++) DRegBuf[i] =DRegBuf[i] &~0x18 | V <<3 &0x18;
+		FixMMC3PRG(MMC3_cmd);
+		FixMMC3CHR(MMC3_cmd);
+	}
+}
+
+static void Power(void) {
+	EXPREGS[0] =0;
+	EXPREGS[1] =0xF0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, WriteReg);
+	SetWriteHandler(0x8000, 0xFFFF, WriteASIC);
+}
+
+static void Reset(void) {
+	EXPREGS[0] =0;
+	EXPREGS[1] =0xF0;
+	MMC3RegReset();
+}
+
+void Mapper478_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 128, info->iNES2? (info->PRGRamSize + info->PRGRamSaveSize) /1024: 8, info->battery);
+	pwrap = PRGWrap;
+	cwrap = CHRWrap;
+	info->Power = Power;
+	info->Reset = Reset;
+	AddExState(EXPREGS, 2, 0, "EXPR");
+}

src/ines.c

@@ -899,6 +899,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "820215-C-A2",	       	475, Mapper475_Init         )
 	INES_BOARD( "Croaky Karaoke",     	476, Mapper476_Init         )
 	INES_BOARD( "15-in-1",		     	477, Mapper477_Init         )
+	INES_BOARD( "WE7HGX",		     	478, Mapper478_Init         )
 	INES_BOARD( "045N",          		481, Mapper481_Init         )
 	INES_BOARD( "ESTIQUE",         		484, Mapper484_Init         )
 	INES_BOARD( "AVE NINA-08",    		487, Mapper487_Init         )

src/ines.h

@@ -378,6 +378,7 @@ void Mapper474_Init(CartInfo *);
 void Mapper475_Init(CartInfo *);
 void Mapper476_Init(CartInfo *);
 void Mapper477_Init(CartInfo *);
+void Mapper478_Init(CartInfo *);
 void Mapper481_Init(CartInfo *);
 void Mapper484_Init(CartInfo *);
 void Mapper487_Init(CartInfo *);