From 4588e03500c70bb40b3dbadcd7033c4cec56903e Mon Sep 17 00:00:00 2001
From: libretroadmin <reallibretroretroarch@gmail.com>
Date: Mon, 10 Jun 2024 19:52:48 +0200
Subject: [PATCH] Add mapper 454

---
 src/boards/454.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 65 insertions(+)
 create mode 100644 src/boards/454.c

diff --git a/src/boards/454.c b/src/boards/454.c
new file mode 100644
index 0000000..729d92f
--- /dev/null
+++ b/src/boards/454.c
@@ -0,0 +1,63 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023-2024 negativeExponent
+ *
+ * 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
+ *
+ */
+
+/* NOTE: Only loading Contra after a reset? RAM init also affects powerup */
+
+#include "mapinc.h"
+#include "latch.h"
+
+static void Sync(void) {
+	uint8 prg = ((latch.addr >> 3) & 0x20) | ((latch.addr >> 2) & 0x1F);
+	uint8 cpuA14 = latch.addr & 0x01;
+	uint8 nrom = (latch.addr >> 7) & 0x01;
+	uint8 unrom = (latch.addr >> 9) & 0x01;
+
+	setprg16(0x8000, ((prg & ~cpuA14) & ~(0x07 * unrom)) | (latch.data * unrom));
+	setprg16(0xC000, ((prg | cpuA14) & ~(0x07 * !nrom * !unrom)) | (0x07 * !nrom * unrom));
+	setchr8(0);
+	setmirror(((latch.addr >> 1) & 0x01) ^ 0x01);
+	if (nrom) {
+		/* CHR-RAM write protect hack, needed for some multicarts */
+		SetupCartCHRMapping(0, CHRptr[0], 0x2000, 0);
+	} else {
+		SetupCartCHRMapping(0, CHRptr[0], 0x2000, 1);
+	}
+}
+
+static DECLFW(M454Write) {
+	if (latch.addr & 0x100) {
+		latch.data = V & 0x07;
+	} else {
+		latch.data = V;
+		latch.addr = A;
+	}
+	Sync();
+}
+
+static void M454Power(void) {
+	LatchPower();
+	SetWriteHandler(0x8000, 0xFFFF, M454Write);
+}
+
+void Mapper454_Init(CartInfo *info) {
+	Latch_Init(info, Sync, NULL, 0, 0);
+	info->Power = M454Power;
+}
diff --git a/src/ines.c b/src/ines.c
index 659015b..3a0ed3b 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -829,6 +829,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "22-in-1 King Series",      449, Mapper449_Init         )
 	INES_BOARD( "DS-9-27",                  452, Mapper452_Init         )
 	INES_BOARD( "Realtec 8042",    		453, Mapper453_Init         )
+	INES_BOARD( "110-in-1",     		454, Mapper454_Init )
 	INES_BOARD( "N625836",                  455, Mapper455_Init         )
 	INES_BOARD( "K6C3001A",                 456, Mapper456_Init         )
 	INES_BOARD( "810431C",                  457, Mapper457_Init         )
diff --git a/src/ines.h b/src/ines.h
index cad0c4f..f18fbed 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -339,6 +339,7 @@ void Mapper448_Init(CartInfo *);
 void Mapper449_Init(CartInfo *);
 void Mapper452_Init(CartInfo *);
 void Mapper453_Init(CartInfo *);
+void Mapper454_Init(CartInfo *);
 void Mapper455_Init(CartInfo *);
 void Mapper456_Init(CartInfo *);
 void Mapper457_Init(CartInfo *);