diff --git a/src/boards/174.c b/src/boards/174.c
new file mode 100644
index 0000000..3b41446
--- /dev/null
+++ b/src/boards/174.c
@@ -0,0 +1,37 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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 "latch.h"
+
+static void Sync(void) {
+    if (latch.addr & 0x80) {
+        setprg32(0x8000, (latch.addr >> 5) & 3);
+    } else {
+        setprg16(0x8000, (latch.addr >> 4) & 7);
+        setprg16(0xC000, (latch.addr >> 4) & 7);
+    }
+	setchr8((latch.addr >> 1) & 7);
+    setmirror((latch.addr & 1) ^ 1);
+}
+
+void Mapper174_Init(CartInfo *info) {
+	Latch_Init(info, Sync, NULL, 0, 0);
+}
diff --git a/src/boards/latch.c b/src/boards/latch.c
new file mode 100644
index 0000000..0db1ca4
--- /dev/null
+++ b/src/boards/latch.c
@@ -0,0 +1,98 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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 "latch.h"
+
+static uint8 bus_conflict;
+static uint8 *WRAM = NULL;
+static uint32 WRAMSIZE;
+static void (*WSync)(void);
+static readfunc defread;
+
+LATCH latch;
+
+DECLFW(LatchWrite) {
+	/*	FCEU_printf("bs %04x %02x\n",A,V); */
+	if (bus_conflict)
+		V &= CartBR(A);
+    latch.addr = A;
+    latch.data = V;
+	WSync();
+}
+
+void LatchHardReset() {
+	latch.addr = 0;
+	latch.data = 0;
+	WSync();
+}
+
+void LatchPower(void) {
+	LatchHardReset();
+	WSync();
+	if (WRAM) {
+		SetReadHandler(0x6000, 0xFFFF, CartBR);
+		SetWriteHandler(0x6000, 0x7FFF, CartBW);
+		FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
+	} else {
+		SetReadHandler(0x8000, 0xFFFF, defread);
+	}
+	SetWriteHandler(0x8000, 0xFFFF, LatchWrite);
+}
+
+void LatchClose(void) {
+	if (WRAM)
+		FCEU_gfree(WRAM);
+	WRAM = NULL;
+}
+
+static void LatchReset(void) {
+	WSync();
+}
+
+static void StateRestore(int version) {
+	WSync();
+}
+
+void Latch_Init(CartInfo *info, void (*proc)(void), readfunc func,
+    uint8 wram, uint8 busc) {
+	bus_conflict = busc;
+	WSync        = proc;
+	if (func != NULL)
+		defread = func;
+	else
+		defread = CartBROB;
+	info->Power = LatchPower;
+	info->Close = LatchClose;
+	info->Reset = LatchReset;
+	GameStateRestore = StateRestore;
+	if (wram) {
+		WRAMSIZE = 8192;
+		WRAM     = (uint8 *)FCEU_gmalloc(WRAMSIZE);
+		SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
+		if (info->battery) {
+			info->SaveGame[0]    = WRAM;
+			info->SaveGameLen[0] = WRAMSIZE;
+		}
+		AddExState(WRAM, WRAMSIZE, 0, "WRAM");
+	}
+	AddExState(&latch.addr, 2, 0, "ADDR");
+	AddExState(&latch.data, 1, 0, "DATA");
+}
diff --git a/src/boards/latch.h b/src/boards/latch.h
new file mode 100644
index 0000000..2eeebd6
--- /dev/null
+++ b/src/boards/latch.h
@@ -0,0 +1,17 @@
+#ifndef _FCEU_LATCH_H
+#define _FCEU_LATCH_H
+
+typedef struct {
+	uint16 addr;
+    uint8 data;
+} LATCH;
+
+extern LATCH latch;
+
+void Latch_Init(CartInfo *info, void (*proc)(void), readfunc func, uint8 wram, uint8 busc);
+void LatchPower(void);
+void LatchClose(void);
+void LatchWrite(uint32 A, uint8 V);
+void LatchHardReset();
+
+#endif /* _FCEU_LATCH_H */
diff --git a/src/ines.c b/src/ines.c
index bc2adf5..a2165c0 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -595,7 +595,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "",                         171, Mapper171_Init         )
 	INES_BOARD( "Super Mega P-4070",        172, Mapper172_Init         )
 	INES_BOARD( "Idea-Tek ET.xx",           173, Mapper173_Init         )
-/*    INES_BOARD( "",                            174, Mapper174_Init ) */
+    	INES_BOARD( "",                         174, Mapper174_Init         )
 	INES_BOARD( "",                         175, Mapper175_Init         )
 	INES_BOARD( "BMCFK23C",                 176, Mapper176_Init         )
 	INES_BOARD( "",                         177, Mapper177_Init         )
diff --git a/src/ines.h b/src/ines.h
index 71c2607..07a9ea2 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -177,6 +177,7 @@ void Mapper170_Init(CartInfo *);
 void Mapper171_Init(CartInfo *);
 void Mapper172_Init(CartInfo *);
 void Mapper173_Init(CartInfo *);
+void Mapper174_Init(CartInfo *);
 void Mapper175_Init(CartInfo *);
 void Mapper176_Init(CartInfo *);
 void Mapper177_Init(CartInfo *);