Rewrite mapper 266 to use modular VRC2/4 emulation.

src/boards/266.c

@@ -0,0 +1,61 @@
+/* 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 uint8  prg;
+
+static SFORMAT UNLCITYFIGHT_stateRegs[] ={
+	{ &prg, 1, "PRG8" },
+	{ 0 }
+};
+
+static void sync () {
+	setprg32(0x8000, prg);
+	VRC24_syncCHR(0x1FF, 0x000);
+	VRC24_syncMirror();
+}
+
+DECLFW(UNLCITYFIGHT_externalSelect) {
+	if (A &0x800)
+		(GetWriteHandler(0x4011))(0x4011, V <<3 &0x78);
+	else {
+		prg =V >>2;
+		VRC24_Sync();
+	}
+}
+
+DECLFW(UNLCITYFIGHT_unscrambleAddress) {
+	VRC24_writeReg(A &~0x6000 | A <<1 &0x4000 | A >>1 &0x2000, V);
+}
+
+void UNLCITYFIGHT_power(void) {
+	prg =0;
+	VRC24_power();
+	SetWriteHandler(0x8000, 0xFFFF, UNLCITYFIGHT_unscrambleAddress);
+}
+
+void UNLCITYFIGHT_Init (CartInfo *info) {
+	VRC24_init(info, sync, 0x04, 0x08, 1, 1, 0);
+	VRC24_ExternalSelect =UNLCITYFIGHT_externalSelect;
+	AddExState(UNLCITYFIGHT_stateRegs, ~0, 0, 0);
+	info->Power =UNLCITYFIGHT_power;
+}