diff --git a/src/boards/574.c b/src/boards/574.c
new file mode 100644
index 0000000..089a73a
--- /dev/null
+++ b/src/boards/574.c
@@ -0,0 +1,46 @@
+/* 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 "asic_latch.h"
+
+static void sync () {
+	if (Latch_address &0x40) /* AOROM */
+		setprg32(0x8000, Latch_address >>2 &~0x07 | Latch_data &0x07);
+	else
+	if (Latch_address &0x20) /* ANROM */
+		setprg32(0x8000, Latch_address >>2 &~0x03 | Latch_data &0x03);
+	else /* NROM-256 */
+		setprg32(0x8000, Latch_address >>2 &~0x03 | Latch_address &0x03);
+	setchr8(0);
+	if (Latch_address &0x60) /* AxROM */
+		setmirror(Latch_data &0x10? MI_1: MI_0);
+	else
+		setmirror(Latch_data &0x10? MI_H: MI_V);
+}
+
+static void trapLatchWrite (uint16 *newAddress, uint8 *newValue, uint8 romValue) { /* After the lock bit is set, only update the data bits and the lowest two address bits. */
+	if (Latch_address &0x80) *newAddress = Latch_address &~0x03 | *newAddress &0x03;
+}
+
+void Mapper574_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, trapLatchWrite);
+	info->Reset = Latch_clear;
+}
diff --git a/src/ines.c b/src/ines.c
index e01debc..fa7dccf 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -955,6 +955,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "9052",                     570, Mapper570_Init         )
 	INES_BOARD( "F-648",                    572, Mapper572_Init         )
 	INES_BOARD( "5068",                     573, Mapper573_Init         )
+	INES_BOARD( "FC-40",                    574, Mapper574_Init         )
 	INES_BOARD( "W-03",                     575, Mapper575_Init         )
 	INES_BOARD( "J-2096",                   576, Mapper576_Init         )
 	INES_BOARD( "KN-29",                    577, Mapper577_Init         )
diff --git a/src/ines.h b/src/ines.h
index ee24aae..30c073c 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -421,6 +421,7 @@ void Mapper567_Init(CartInfo *);
 void Mapper570_Init(CartInfo *);
 void Mapper572_Init(CartInfo *);
 void Mapper573_Init(CartInfo *);
+void Mapper574_Init(CartInfo *);
 void Mapper575_Init(CartInfo *);
 void Mapper576_Init(CartInfo *);
 void Mapper577_Init(CartInfo *);