diff --git a/src/boards/473.c b/src/boards/473.c
new file mode 100644
index 0000000..af1b193
--- /dev/null
+++ b/src/boards/473.c
@@ -0,0 +1,62 @@
+/* FCEUmm - 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 "mmc3.h"
+
+static void Mapper473_PRGWrap(uint32 A, uint8 V) {
+	int prgAND =EXPREGS[0] &0x20? (0xFF >> (7 -(EXPREGS[0] &7))): 0x00;
+	int prgOR  =EXPREGS[0] &0x20? (EXPREGS[1] | EXPREGS[2] <<8): 0x3F;
+	setprg8(A, V &prgAND | prgOR &~prgAND);
+	SetWriteHandler(0x8000, 0xBFFF, EXPREGS[0] &0x40? CartBW: MMC3_CMDWrite);
+	SetWriteHandler(0xC000, 0xFFFF, EXPREGS[0] &0x40? CartBW: MMC3_IRQWrite);
+}
+
+static void Mapper473_CHRWrap(uint32 A, uint8 V) {
+	if (~EXPREGS[0] &0x80)
+		setchr8(EXPREGS[3]);
+	else
+		setchr1(A, V);
+}
+
+static DECLFW(Mapper473_WriteReg) {
+	EXPREGS[A &3] =V;
+	FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static void Mapper473_Reset(void) {
+	EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =0;
+	MMC3RegReset();
+}
+
+static void Mapper473_Power(void) {	
+	EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =0;
+	GenMMC3Power();
+	SetWriteHandler(0x4800, 0x4FFF, Mapper473_WriteReg);
+}
+
+void Mapper473_Init(CartInfo *info) {
+	GenMMC3_Init(info, 512, 256, (info->PRGRamSize +info->PRGRamSaveSize) >>10, info->battery);
+	cwrap = Mapper473_CHRWrap;
+	pwrap = Mapper473_PRGWrap;
+	info->Power = Mapper473_Power;
+	info->Reset = Mapper473_Reset;
+	AddExState(EXPREGS, 4, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index 7761088..b54c5a5 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -854,6 +854,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "BlazePro CPLD",           	468, Mapper468_Init         )
 	INES_BOARD( "INX_007T_V01",		470, INX_007T_Init          )
 	INES_BOARD( "830947",	          	472, Mapper472_Init         )
+	INES_BOARD( "KJ01A-18",	          	473, Mapper473_Init         )
 	INES_BOARD( "045N",          		481, Mapper481_Init         )
 	INES_BOARD( "AVE NINA-08",    		487, Mapper487_Init         )
 	INES_BOARD( "Yhc-000",                  500, Mapper500_Init         )
diff --git a/src/ines.h b/src/ines.h
index 549944a..2bea257 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -365,6 +365,7 @@ void Mapper467_Init(CartInfo *);
 void Mapper468_Init(CartInfo *);
 void INX_007T_Init(CartInfo* info); /* Mapper 470 */
 void Mapper472_Init(CartInfo *);
+void Mapper473_Init(CartInfo *);
 void Mapper481_Init(CartInfo *);
 void Mapper487_Init(CartInfo *);
 void Mapper500_Init(CartInfo *);