From 00c0ff91229da2ca6e2a276110e19f0a10696fa0 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Fri, 25 Apr 2025 00:19:45 +0200
Subject: [PATCH] Add mapper 471.

---
 src/boards/471.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 58 insertions(+)
 create mode 100644 src/boards/471.c

diff --git a/src/boards/471.c b/src/boards/471.c
new file mode 100644
index 0000000..2dbb83d
--- /dev/null
+++ b/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;
+}
diff --git a/src/ines.c b/src/ines.c
index cec422f..8a4ffb4 100644
--- a/src/ines.c
+++ b/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         )
diff --git a/src/ines.h b/src/ines.h
index 8118922..749f299 100644
--- a/src/ines.h
+++ b/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 *);