diff --git a/src/boards/389.c b/src/boards/389.c
new file mode 100644
index 0000000..b90beae
--- /dev/null
+++ b/src/boards/389.c
@@ -0,0 +1,84 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2020 negativeExponent
+ *
+ * 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.
+ */
+
+/* Mapper 389 - Caltron 9-in-1 multicart */
+
+#include "mapinc.h"
+
+static uint8 regs[3];
+
+static SFORMAT StateRegs[] = {
+   { &regs, 3, "REGS" },
+   { 0 }
+};
+
+static void Sync(void)
+{
+   if (regs[1] & 0x02)
+   {
+      /* UNROM-064 */
+      setprg16(0x8000, (regs[0] >> 2) | ((regs[2] >> 2) & 0x03));
+      setprg16(0xC000, (regs[0] >> 2) | 0x03);
+   }
+   else
+   {
+      /* NROM-256 */
+      setprg32(0x8000, regs[0] >> 3);
+   }
+   setchr8(((regs[1] >> 1) & 0x1C) | (regs[2] & 0x03));
+   setmirror((regs[0] & 0x01) ^ 1);
+}
+
+static DECLFW(M389Write)
+{
+   switch (A & 0xF000)
+   {
+   case 0x8000: regs[0] = (A & 0xFF); Sync(); break;
+   case 0x9000: regs[1] = (A & 0xFF); Sync(); break;
+   default:     regs[2] = (A & 0xFF); Sync(); break;
+   }
+}
+
+static void M389Reset(void)
+{
+   regs[0] = regs[1] = regs[2] = 0;
+   Sync();
+}
+
+static void M389Power(void)
+{
+   regs[0] = regs[1] = regs[2] = 0;
+   Sync();
+   SetReadHandler(0x8000, 0xFFFF, CartBR);
+   SetWriteHandler(0x8000, 0xFFFF, M389Write);
+}
+
+static void StateRestore(int version)
+{
+   Sync();
+}
+
+void Mapper389_Init(CartInfo *info)
+{
+   info->Power = M389Power;
+   info->Reset = M389Reset;
+   GameStateRestore = StateRestore;
+   AddExState(&StateRegs, ~0, 0, 0);
+}
diff --git a/src/ines-correct.h b/src/ines-correct.h
index c30e505..937a154 100644
--- a/src/ines-correct.h
+++ b/src/ines-correct.h
@@ -133,6 +133,7 @@
 	{ 0x4c7c1af3,	 34,		1 },	/* Caesar's Palace */
 	{ 0x932ff06e,	 34,		1 },	/* Classic Concentration */
 	{ 0xf46ef39a,	 37,	   -1 },	/* Super Mario Bros. + Tetris + Nintendo World Cup (E) [!] */
+	{ 0x4686C5DD,	 41,	   -1 },	/* Caltron - 6 in 1 (USA) (Unl).nes */
 	{ 0x090C0C17,	 42,		1 },	/* Ai Senshi Nicol (FDS Conversion) [p1][!].nes */
 	{ 0x4DF84825,	 42,		1 },	/* Ai Senshi Nicol (FDS Conversion) [p2][!].nes */
 	{ 0x579E5BC5,	 42,		1 },	/* Ai Senshi Nicol (FDS Conversion) [p3].nes */
@@ -397,6 +398,7 @@
 	{ 0xf6b9d088,    366,        0 }, /* 4-in-1 (K-3131GS, GN-45) [p1][!] */
 	{ 0x503566b2,    366,        0 }, /* 4-in-1 (K-3131SS, GN-45) [p1][!] */
 	{ 0xDB2D2D88,    369,        -1 }, /* Super Mario Bros. Party.nes */
+	{ 0xC4B94BD5,    389,        -1 }, /* Caltron - 9 in 1 (USA) (Proto) */
 
 	/* ines mappers that uses unif boards */
 
diff --git a/src/ines.c b/src/ines.c
index 197dfd4..2399220 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -672,6 +672,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "95/96 Super HiK 4-in-1",   374, Mapper374_Init         )
 	INES_BOARD( "KN-42",                    381, Mapper381_Init         )
 	INES_BOARD( "830928C",                  382, Mapper382_Init         )
+	INES_BOARD( "Caltron 9-in-1",           389, Mapper389_Init         )
 	INES_BOARD( "Realtec 8031",             390, Mapper390_Init         )
 	INES_BOARD( "Brilliant Com Cocoma Pack", 516, Mapper516_Init        )
 	INES_BOARD( "Sachen 3014",              533, Mapper533_Init         )
diff --git a/src/ines.h b/src/ines.h
index 5637c7f..4219a7f 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -262,6 +262,7 @@ void Mapper372_Init(CartInfo *);
 void Mapper374_Init(CartInfo *);
 void Mapper382_Init(CartInfo *);
 void Mapper381_Init(CartInfo *);
+void Mapper389_Init(CartInfo *);
 void Mapper390_Init(CartInfo *);
 void Mapper516_Init(CartInfo *);
 void Mapper533_Init(CartInfo *);