diff --git a/src/boards/830134C.c b/src/boards/830134C.c
new file mode 100644
index 0000000..7d546d5
--- /dev/null
+++ b/src/boards/830134C.c
@@ -0,0 +1,72 @@
+/* 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 315
+ * BMC-830134C
+ * Used for multicarts using 820732C- and 830134C-numbered PCBs such as 4-in-1 Street Blaster 5
+ * http://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_315
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void BMC830134CCW(uint32 A, uint8 V) {
+	uint32 chip = (EXPREGS[0] & 0x03) & ~((EXPREGS[0] & 0x02) >> 1);
+	setchr1r(chip, A, (V & 0xFF) | ((EXPREGS[0] & 0x01) << 8) | ((EXPREGS[0] & 0x02) << 6) | ((EXPREGS[0] & 0x08) << 3));
+}
+
+static void BMC830134CPW(uint32 A, uint8 V) {
+	uint32 chip = (EXPREGS[0] & 0x06) >> 1;
+	if ((EXPREGS[0] & 0x06) == 0x06) {
+		if (A == 0x8000) {
+			setprg8r(chip, A, (V & 0x0F) | ((EXPREGS[0] & 0x06) << 3));
+			setprg8r(chip, 0xC000, (V & 0x0F) | 0x32);
+		} else if (A == 0xA000) {
+			setprg8r(chip, A, (V & 0x0F) | ((EXPREGS[0] & 0x06) << 3));
+			setprg8r(chip, 0xE000, (V & 0x0F) | 0x32);
+		}
+	} else
+		setprg8r(chip, A, (V & 0x0F) | ((EXPREGS[0] & 0x06) << 3));
+}
+
+static DECLFW(BMC830134CWrite) {
+	EXPREGS[0] = V;
+	FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static void BMC830134CReset(void) {
+	EXPREGS[0] = 0;
+	MMC3RegReset();
+}
+
+static void BMC830134CPower(void) {
+	GenMMC3Power();
+	SetWriteHandler(0x6800, 0x68FF, BMC830134CWrite);
+}
+
+void BMC830134C_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 256, 1, 0);
+	pwrap = BMC830134CPW;
+	cwrap = BMC830134CCW;
+	info->Power = BMC830134CPower;
+	info->Reset = BMC830134CReset;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}
diff --git a/src/unif.c b/src/unif.c
index 9772d75..d58c1d4 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -502,6 +502,7 @@ static BMAPPING bmap[] = {
 	{ "NEWSTAR-GRM070-8IN1", BMC8IN1_Init, 0 },
 	{ "FARID_UNROM_8-IN-1", FARIDUNROM_Init, 0 },
 	{ "K-3033", BMCK3033_Init, 0 },
+	{ "830134C", BMC830134C_Init, 0 },
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },
diff --git a/src/unif.h b/src/unif.h
index 5bc341d..b35c250 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -189,6 +189,7 @@ void BMCCTC12IN1_Init(CartInfo *info);		/* m337 */
 void BMC891227_Init(CartInfo *info);		/* m350 */
 void FARIDUNROM_Init(CartInfo *info);		/* m324 */
 void BMCK3033_Init(CartInfo *info);			/* mm22 */
+void BMC830134C_Init(CartInfo *info);		/* m315 */
 
 #ifdef COPYFAMI
 void MapperCopyFamiMMC3_Init(CartInfo *info);