diff --git a/src/boards/bmcgamecard.c b/src/boards/bmcgamecard.c
new file mode 100644
index 0000000..e634abd
--- /dev/null
+++ b/src/boards/bmcgamecard.c
@@ -0,0 +1,95 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  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
+ */
+
+/* NES 2.0 Mapper 337 - BMC-CTC-12IN1
+ * 12-in-1 Game Card multicart
+ * https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_337
+
+ * NES 2.0 Mapper 350 - BMC-891227
+ * Super 15-in-1 Game Card 
+ * https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_350
+ */
+
+#include "mapinc.h"
+
+static uint8 latche, m350;
+
+static SFORMAT StateRegs[] =
+{
+	{ &latche, 1, "LATC" },
+	{ &m350, 1, "M350" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	uint8 mirroring = m350 ? ((latche >> 7) & 1) : ((latche >> 5) & 1);
+	uint8 mode      = m350 ? ((latche >> 5) & 0x03) : ((latche >> 6) & 0x03);
+	uint8 chip      = m350 ? ((mode & 2) ? ((latche >> 5) & 1) : 0) : 0;
+
+	setchr8(0);
+	setprg8(0x6000, 1);
+	setprg16r(PRGptr[1] ? chip : 0, 0x8000, (latche & 0x1F));
+	setprg16r(PRGptr[1] ? chip : 0, 0xC000, (latche & 0x1F) | ((mode & 2) ? 0x07 : (mode & 1)));
+	setmirror(mirroring ^ 1);
+}
+
+static DECLFW(BMCCTC12IN1Write8) {
+	latche = (latche & 7) | (V & ~7);
+	Sync();
+}
+
+static DECLFW(BMCCTC12IN1WriteC) {
+	latche = (latche & ~7) | (V & 7);
+	Sync();
+}
+
+static void BMCCTC12IN1Power(void) {
+	Sync();
+	SetReadHandler(0x6000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0xBFFF, BMCCTC12IN1Write8);
+	SetWriteHandler(0xC000, 0xFFFF, BMCCTC12IN1WriteC);
+}
+
+static void BMCCTC12IN1Reset(void) {
+	latche = 0;
+	Sync();
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+/* Mapper 337 - BMC-CTC-12IN1 */
+void BMCCTC12IN1_Init(CartInfo *info) {
+	m350 = 0;
+	info->Power = BMCCTC12IN1Power;
+	info->Reset = BMCCTC12IN1Reset;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}
+
+/* Mapper 350 - BMC-891227 */
+void BMC891227_Init(CartInfo *info) {
+	m350 = 1;
+	info->Power = BMCCTC12IN1Power;
+	info->Reset = BMCCTC12IN1Reset;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}
diff --git a/src/unif.c b/src/unif.c
index a918888..1d8159c 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -473,7 +473,6 @@ static BMAPPING bmap[] = {
 	{ "WAIXING-FW01", Mapper227_Init, 0 }, /* https://wiki.nesdev.com/w/index.php/Talk:INES_Mapper_242 */
 	{ "WAIXING-FS005", BMCFK23C_Init, 0 }, /* https://wiki.nesdev.com/w/index.php/INES_Mapper_176 */
 	{ "80013-B", BMC80013B_Init, 0 },
-
 	{ "TH2131-1", UNLTH21311_Init, 0 },
 	{ "LH51", LH51_Init, 0 },
 	{ "RESETNROM-XIN1", BMCRESETNROMXIN1_Init, 0 },
@@ -492,13 +491,14 @@ static BMAPPING bmap[] = {
 	{ "KS7021A", UNLKS7021A_Init, 0 },
 	{ "KS106C", BMCKS106C_Init, 0 },
 	{ "900218", BTL900218_Init, 0 },
-
 	{ "JC-016-2", Mapper205_Init, 0 },
 	{ "AX-40G", UNLAX40G_Init, 0 },
 	{ " BMC-STREETFIGTER-GAME4IN1", BMCSFGAME4IN1_Init, 0 },
 	{ "G631", BMCGhostbusters63in1_Init, 0 },
 	{ "BJ-56", UNLBJ56_Init, 0 },
 	{ "L6IN1", BMCL6IN1_Init, 0 },
+	{ "CTC-12IN1", BMCCTC12IN1_Init, 0 },
+	{ "891227", BMC891227_Init, 0 },
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },
diff --git a/src/unif.h b/src/unif.h
index a378f12..98bb3b1 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -185,6 +185,9 @@ void BMCSFGAME4IN1_Init(CartInfo *info);	/* m049 */
 void UNLBJ56_Init(CartInfo *info);			/* m526 */
 void BMCL6IN1_Init(CartInfo *info);			/* m345 */
 
+void BMCCTC12IN1_Init(CartInfo *info);		/* m337 */
+void BMC891227_Init(CartInfo *info);		/* m350 */
+
 #ifdef COPYFAMI
 void MapperCopyFamiMMC3_Init(CartInfo *info);
 void MapperCopyFami_Init(CartInfo *info);