Add mapper 471.

src/boards/471.c

@@ -0,0 +1,56 @@
+/* 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 latch;
+
+static SFORMAT stateRegs[] ={
+	{ &latch, 1, "LATC" },
+	{ 0 }
+};
+
+static void sync () {
+	setprg32(0x8000, latch);
+	setchr8(latch);
+}
+
+static DECLFW(writeLatch) {
+	X6502_IRQEnd(FCEU_IQEXT);
+	latch =A &0xFF;
+	sync();
+}
+
+static void power(void) {
+	latch =0;
+	sync();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0xFFFF, writeLatch);
+}
+
+static void pseudoScanline () {
+	X6502_IRQBegin(FCEU_IQEXT);
+}
+
+void Mapper471_Init(CartInfo *info) {
+	AddExState(stateRegs, ~0, 0, 0);
+	info->Power =power;
+	GameHBIRQHook =pseudoScanline;
+}

src/ines.c

@@ -892,6 +892,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "47-2",                 	467, Mapper467_Init         )
 	INES_BOARD( "BlazePro CPLD",           	468, Mapper468_Init         )
 	INES_BOARD( "INX_007T_V01",		470, INX_007T_Init          )
+	INES_BOARD( "Impact Soft IM1",	       	471, Mapper471_Init         )
 	INES_BOARD( "830947",	          	472, Mapper472_Init         )
 	INES_BOARD( "KJ01A-18",	          	473, Mapper473_Init         )
 	INES_BOARD( "045N",          		481, Mapper481_Init         )

src/ines.h

@@ -371,6 +371,7 @@ void Mapper466_Init(CartInfo *);
 void Mapper467_Init(CartInfo *);
 void Mapper468_Init(CartInfo *);
 void INX_007T_Init(CartInfo* info); /* Mapper 470 */
+void Mapper471_Init(CartInfo *);
 void Mapper472_Init(CartInfo *);
 void Mapper473_Init(CartInfo *);
 void Mapper481_Init(CartInfo *);