Add mapper 457

src/boards/457.c

@@ -0,0 +1,60 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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 M457CW(uint32 A, uint8 V) {
+	uint32 mask = (EXPREGS[0] & 8) ? 0xFF : 0x7F;
+	setchr1(A, ((EXPREGS[0] << 7) & ~mask) | (V & mask));
+}
+
+static void M457PW(uint32 A, uint8 V) {
+	uint32 mask = (EXPREGS[0] & 8) ? 0x1F : 0x0F;
+	setprg8(A, (((EXPREGS[0] & 7) << 4) & ~mask) | (V & mask));
+}
+
+static DECLFW(M457Write) {
+	if (MMC3CanWriteToWRAM()) {
+		EXPREGS[0] = V;
+		FixMMC3PRG(MMC3_cmd);
+		FixMMC3CHR(MMC3_cmd);
+	}
+}
+
+static void M457Reset(void) {
+	EXPREGS[0] = 0;
+	MMC3RegReset();
+}
+
+static void M457Power(void) {
+	EXPREGS[0] = 0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, M457Write);
+}
+
+void Mapper457_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 256, 0, 0);
+	cwrap = M457CW;
+	pwrap = M457PW;
+	info->Reset = M457Reset;
+	info->Power = M457Power;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}

src/ines.c

@@ -831,6 +831,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Realtec 8042",    		453, Mapper453_Init         )
 	INES_BOARD( "N625836",                  455, Mapper455_Init         )
 	INES_BOARD( "K6C3001A",                 456, Mapper456_Init         )
+	INES_BOARD( "810431C",                  457, Mapper457_Init         )
 	INES_BOARD( "8-in-1",                   459, Mapper459_Init         )
 	INES_BOARD( "FC-29-40/K-3101",        	460, Mapper460_Init         )
 	INES_BOARD( "0324",                 	461, Mapper461_Init         )

src/ines.h

@@ -340,6 +340,7 @@ void Mapper452_Init(CartInfo *);
 void Mapper453_Init(CartInfo *);
 void Mapper455_Init(CartInfo *);
 void Mapper456_Init(CartInfo *);
+void Mapper457_Init(CartInfo *);
 void Mapper459_Init(CartInfo *);
 void Mapper460_Init(CartInfo *);
 void Mapper461_Init(CartInfo *);