Add mappers 597 and 598.

src/boards/598.c

@@ -0,0 +1,63 @@
+/* FCE Ultra - 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
+ */
+
+#include "mapinc.h"
+
+static uint8 reg[4];
+
+static void sync () {
+	int prg = reg[3] <<3 | reg[1] &0x07;
+	if (reg[3] &0x08)
+		setprg32(0x8000, prg >>1);
+	else {
+		setprg16(0x8000, prg);
+		setprg16(0xC000, prg |7);
+	}
+	setchr4(0x0000, reg[3] <<5 | reg[1] >>3 &0x1F);
+	setchr4(0x1000, reg[3] <<5 | reg[2] >>3 &0x1F);
+	setmirror(reg[3] &0x04? MI_H: MI_V);
+}
+
+static DECLFW (writeReg) {
+	reg[A >>13 &3] = V;
+	sync();
+}
+
+static void reset () {
+	reg[0] = reg[1] = reg[2] = reg[3] = 0;
+	sync();
+}
+
+static void power () {
+	SetReadHandler(0x6000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0xFFFF, writeReg);
+	reset();
+}
+
+static void stateRestore (int version) {
+	sync();
+}
+
+void Mapper598_Init (CartInfo *info) {
+	info->Power = power;
+	info->Reset = reset;
+	GameStateRestore = stateRestore;
+	AddExState(reg, 4, 0, "REGS");
+}