Rewrote the VRC2/4 emulation for modularity, and separate individual mappers into separate source files.

src/boards/525.c

@@ -0,0 +1,43 @@
+/* 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"
+#include "vrc2and4.h"
+
+static void sync () {
+	VRC24_syncPRG(0x01F, 0x000);
+	VRC24_syncCHR(0x1FF, 0x000);
+	VRC24_syncMirror();
+}
+
+DECLFW(UNLKS7021A_writeCHR) {
+	VRC24_chr[A &7] =V;
+	VRC24_Sync();
+}
+
+void UNLKS7021A_power (void) {
+	VRC24_power();
+	SetWriteHandler(0xB000, 0xEFFF, UNLKS7021A_writeCHR);
+}
+
+void UNLKS7021A_Init (CartInfo *info) {
+	VRC24_init(info, sync, 0x01, 0x02, 0, 0, 0);
+	info->Power =UNLKS7021A_power;
+}