diff --git a/src/boards/340.c b/src/boards/340.c
new file mode 100644
index 0000000..3444c48
--- /dev/null
+++ b/src/boards/340.c
@@ -0,0 +1,43 @@
+/* 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 () {
+	int prg = Latch_address >>2 &0x20 | Latch_address &0x1F;
+	if (Latch_address &0x20) {
+		if (Latch_address &0x01) {
+			setprg16(0x8000, prg);
+			setprg16(0xC000, prg);		
+		} else
+			setprg32(0x8000, prg >>1);
+	} else {
+		setprg16(0x8000, prg);
+		setprg16(0xC000, prg | 7);
+	}
+	setchr8(0);
+	setmirror(Latch_address &0x040 || (Latch_address &0x025) == 0x025 || (Latch_address &0x118) == 0x010? MI_H: MI_V);
+}
+
+void Mapper340_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, NULL);
+	info->Reset = Latch_clear;
+}
diff --git a/src/boards/bmck3036.c b/src/boards/bmck3036.c
deleted file mode 100644
index 73e03eb..0000000
--- a/src/boards/bmck3036.c
+++ /dev/null
@@ -1,69 +0,0 @@
-/* FCEUmm - NES/Famicom Emulator
- *
- * Copyright (C) 2019 Libretro Team
- *
- * 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 regs[2];
-
-static SFORMAT StateRegs[] =
-{
-	{ regs,  2, "REGS" },
-	{ 0 }
-};
-
-static void Sync(void) {
-	if (regs[0] &0x20) { /* NROM-128 */
-		setprg16(0x8000, regs[0] >>2 &0x20 | regs[0] &0x1F);
-		setprg16(0xC000, regs[0] >>2 &0x20 | regs[0] &0x1F);
-	} else {	    /* UNROM */
-		setprg16(0x8000, regs[0] >>2 &0x20 | regs[0] | regs[1] &7);
-		setprg16(0xC000, regs[0] >>2 &0x20 | regs[0] |          7);
-	}
-	setchr8(0);
-	setmirror((regs[0] &0x40 || regs[0] &0x20 && regs[0] &0x04)? MI_H: MI_V);
-}
-
-static DECLFW(M340Write) {
-	regs[0] = A & 0xFF;
-	regs[1] = V;
-	Sync();
-}
-
-static void BMCK3036Power(void) {
-	Sync();
-	SetReadHandler(0x8000, 0xFFFF, CartBR);
-	SetWriteHandler(0x8000, 0xFFFF, M340Write);
-}
-
-static void BMCK3036Reset(void) {
-	regs[0] = regs[1] = 0;
-	Sync();
-}
-
-static void StateRestore(int version) {
-	Sync();
-}
-
-void BMCK3036_Init(CartInfo *info) {
-	info->Power = BMCK3036Power;
-	info->Reset = BMCK3036Reset;
-	GameStateRestore = StateRestore;
-	AddExState(&StateRegs, ~0, 0, 0);
-}
diff --git a/src/ines.c b/src/ines.c
index d704063..ba9338c 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -785,7 +785,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "CTC-12IN1",                337, BMCCTC12IN1_Init       )
 	INES_BOARD( "SA005-A",                  338, BMCSA005A_Init         )
 	INES_BOARD( "K-3006",                   339, BMCK3006_Init          )
-	INES_BOARD( "K-3036",                   340, BMCK3036_Init          )
+	INES_BOARD( "K-3036",                   340, Mapper340_Init         )
 	INES_BOARD( "TJ-03",                    341, BMCTJ03_Init           )
 	INES_BOARD( "COOLGIRL",                 342, COOLGIRL_Init          )
 	INES_BOARD( "GN-26",                    344, BMCGN26_Init           )
diff --git a/src/ines.h b/src/ines.h
index c90ef0a..1c48ffd 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -279,6 +279,7 @@ void Mapper321_Init(CartInfo *);
 void Mapper326_Init(CartInfo *);
 void Mapper330_Init(CartInfo *);
 void Mapper334_Init(CartInfo *);
+void Mapper340_Init(CartInfo *);
 void Mapper351_Init(CartInfo *);
 void Mapper352_Init(CartInfo *);
 void Mapper353_Init(CartInfo *);
diff --git a/src/unif.c b/src/unif.c
index 2332e14..9a91a53 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -595,7 +595,7 @@ static BMAPPING bmap[] = {
 	{ "K-3046",                     336, BMCK3046_Init,         0 },
 	{ "SA005-A",                    338, BMCSA005A_Init,        0 },
 	{ "K-3006",                     339, BMCK3006_Init,         0 },
-	{ "K-3036",                     340, BMCK3036_Init,         0 },
+	{ "K-3036",                     340, Mapper340_Init,        0 },
 	{ "KS7021A",                    525, UNLKS7021A_Init,       0 },
 	{ "KS106C",                 NO_INES, BMCKS106C_Init,        0 }, /* split roms */
 	{ "900218",                     524, BTL900218_Init,        0 },
diff --git a/src/unif.h b/src/unif.h
index 4a07fe4..2caf553 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -164,7 +164,7 @@ void BMCCTC09_Init(CartInfo *info);			/* m335 */
 void BMCK3046_Init(CartInfo *info);			/* m336 */
 void BMCSA005A_Init(CartInfo *info);		/* m338 */
 void BMCK3006_Init(CartInfo *info);			/* m339 */
-void BMCK3036_Init(CartInfo *info);			/* m340 */
+void Mapper340_Init(CartInfo *info);			/* m340 */
 void MINDKIDS_Init(CartInfo *info);			/* m268 */
 void UNLKS7021A_Init(CartInfo *info);		/* m525 */
 void BTL900218_Init(CartInfo *info);		/* m524 */