diff --git a/src/boards/432.c b/src/boards/432.c
new file mode 100644
index 0000000..777936f
--- /dev/null
+++ b/src/boards/432.c
@@ -0,0 +1,64 @@
+/* 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
+ *
+ *
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void M432CW(uint32 A, uint8 V) {
+    if (EXPREGS[0] & 4)
+        setchr1(A, (V & 0x7F) | ((EXPREGS[0] << 7) & 0x80) | ((EXPREGS[0] << 5) & 0x100));
+    else
+        setchr1(A, V | ((EXPREGS[0] << 5) & 0x100));
+}
+
+static void M432PW(uint32 A, uint8 V) {
+    if (EXPREGS[0] & 4)
+        setprg8(A, (V & 0x0F) | ((EXPREGS[0] << 4) & 0x10) | ((EXPREGS[0] << 1) & 0x20));
+    else
+        setprg8(A, (V & 0x1F) | ((EXPREGS[0] << 1) & 0x20));
+}
+
+static DECLFW(M432Write) {
+    EXPREGS[0] = V;
+    FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static void M432Reset(void) {
+	EXPREGS[0] = 0;
+	MMC3RegReset();
+}
+
+static void M432Power(void) {
+	EXPREGS[0] = 0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, M432Write);
+}
+
+void Mapper432_Init(CartInfo *info) {
+	GenMMC3_Init(info, 256, 256, 0, 0);
+	cwrap = M432CW;
+	pwrap = M432PW;
+	info->Power = M432Power;
+	info->Reset = M432Reset;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index a4465c5..a4195c8 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -712,6 +712,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "0353",                     415, Mapper415_Init         )
 	INES_BOARD( "4-in-1/N-32",              416, Mapper416_Init         )
 	INES_BOARD( "BS-400R/BS-4040",          422, Mapper422_Init         )
+	INES_BOARD( "Realtec 8090",             432, Mapper432_Init         )
 	INES_BOARD( "Brilliant Com Cocoma Pack", 516, Mapper516_Init        )
 	INES_BOARD( "Sachen 3014",              533, Mapper533_Init         )
 	INES_BOARD( "NJ064",                    534, Mapper534_Init         )
diff --git a/src/ines.h b/src/ines.h
index daac2ee..abdfad7 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -299,6 +299,7 @@ void Mapper421_Init(CartInfo *);
 void Mapper422_Init(CartInfo *);
 void Mapper428_Init(CartInfo *);
 void Mapper429_Init(CartInfo *);
+void Mapper432_Init(CartInfo *);
 void Mapper434_Init(CartInfo *);
 void Mapper436_Init(CartInfo *);
 void Mapper437_Init(CartInfo *);