Add mapper 571.

src/boards/571.c

@@ -0,0 +1,72 @@
+/* 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
+ *
+ *
+ */
+
+#include "mapinc.h"
+#include "asic_vrc2and4.h"
+
+static uint8 reg;
+
+static void sync () {
+	int prgAND = reg &0x10? 0x1F: 0x0F;
+	int chrAND = reg &0x10? 0xFF: 0x7F;
+	int prgOR = reg <<1;
+	int chrOR = reg <<4;
+	if (reg &0x20)
+		VRC24_syncPRG(prgAND, prgOR &~prgAND);
+	else
+	if (reg &0x6)
+		setprg32(0x8000, reg >>1);
+	else {
+		setprg16(0x8000, reg);
+		setprg16(0xC000, reg);
+	}
+	VRC24_syncCHR(chrAND, chrOR &~chrAND);
+	VRC24_syncMirror();
+	if (reg &0x10)
+		VRC24_reconfigure(8, 4);
+	else
+		VRC24_reconfigure(4, 8);
+}
+
+static DECLFW (writeReg) {
+	if (~reg &0x01) {
+		reg = A &0xFF;
+		sync();
+	}
+}
+
+static void reset () {
+	reg = 0;
+	sync();
+}
+
+static void power () {
+	reg = 0;
+	VRC24_power();
+}
+
+void Mapper571_Init (CartInfo *info) {
+	VRC4_init(info, sync, 4, 8, 1, NULL, NULL, NULL, writeReg, NULL);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+}