Add mapper 495.

src/boards/495.c

@@ -0,0 +1,83 @@
+/* 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 prg[3];
+static uint8 chr[4];
+static uint8 latch[2];
+
+static SFORMAT stateRegs[] = {
+	{ prg,   3, "PRGR" },
+	{ chr,   4, "CHRR" },
+	{ latch, 2, "LATC" },
+	{ 0 }
+};
+
+static void sync() {
+	setprg8(0x8000, prg[0]);
+	setprg8(0xA000, prg[1]);
+	setprg8(0xC000, prg[2]);
+	setprg8(0xE000,   0xFF);
+	setchr4(0x0000, chr[0 | latch[0]]);
+	setchr4(0x1000, chr[2 | latch[1]]);
+	switch(chr[latch[0]] >>6) {
+		case 0: setmirrorw(0, 0, 0, 1); break;
+		case 1: setmirror(MI_H); break;
+		case 2: setmirror(MI_V); break;
+		case 3: setmirror(MI_1); break;
+	}
+}
+
+static void FP_FASTAPASS(1) trapPPUAddressChange (uint32 A) {
+	if ((A &0x2FF0) == 0xFD0 || (A &0x2FF0) == 0xFE0) {
+		latch[A >>12 &1] = ~A >>5 &1;
+		sync();
+	}
+}
+
+static DECLFW(writeReg) {
+	if (A <0xE000)
+		prg[A >>13 &3] = V;
+	else
+		chr[A >>10 &3] = V;
+	sync();
+}
+
+static void restore (int version) {
+	sync();
+}
+
+static void power () {
+	prg[0] = prg[1] = prg[2] = 0;
+	chr[0] = chr[1] = chr[2] = chr[3] = 0;
+	latch[0] = 0; latch[1] = 0;
+	sync();
+	SetReadHandler (0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0xFFFF, writeReg);
+	PPU_hook = trapPPUAddressChange;
+}
+
+void Mapper495_Init (CartInfo *info) {
+	AddExState(stateRegs, ~0, 0, 0);
+	info->Power = power;
+	info->Reset = sync;
+	GameStateRestore = restore;
+}