diff --git a/src/boards/498.c b/src/boards/498.c
new file mode 100644
index 0000000..000005a
--- /dev/null
+++ b/src/boards/498.c
@@ -0,0 +1,62 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2020
+ *
+ * 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 "asic_mmc1.h"
+
+static uint8 reg;
+
+static void sync () {
+	if (reg &0x20)
+		MMC1_syncPRG(0x07, reg &~0x07);
+	else
+	if (reg &0x04)
+		setprg32(0x8000, reg >>1);
+	else {
+		setprg16(0x8000, reg);
+		setprg16(0xC000, reg);
+	}
+	MMC1_syncCHR(0x1F, reg <<2 &~0x1F);
+	MMC1_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	reg = A &0xFF;
+	sync();
+}
+
+static void reset () {
+	reg = 0;
+	MMC1_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC1_power();
+}
+
+void Mapper498_Init (CartInfo *info) {
+	MMC1_init(info, sync, MMC1_TYPE_MMC1A, NULL, NULL, NULL, writeReg);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+}
diff --git a/src/boards/asic_mmc1.c b/src/boards/asic_mmc1.c
index ca3eb69..42fdc6a 100644
--- a/src/boards/asic_mmc1.c
+++ b/src/boards/asic_mmc1.c
@@ -115,7 +115,7 @@ DECLFW(MMC1_writeReg) {
 	MMC1_filter = 2;
 }
 
-static void MMC1_clear() {
+void MMC1_clear() {
 	MMC1_reg[0] = 0x0C; MMC1_reg[1] = 0; MMC1_reg[2] = 0; MMC1_reg[3] = 0; /* "Bad News Baseball" is sensitive to the initial CHR bank register content. 0/0 seems to work. */
 	MMC1_bits = 0; MMC1_shift = 0; MMC1_filter = 0;
 	MMC1_cbSync();
diff --git a/src/boards/asic_mmc1.h b/src/boards/asic_mmc1.h
index 971d719..e72260c 100644
--- a/src/boards/asic_mmc1.h
+++ b/src/boards/asic_mmc1.h
@@ -32,6 +32,7 @@ void MMC1_syncCHR (int, int);
 void MMC1_syncMirror ();
 void FP_FASTAPASS(1) MMC1_cpuCycle(int);
 DECLFW (MMC1_writeReg);
+void MMC1_clear ();
 void MMC1_addExState ();
 void MMC1_restore (int);
 void MMC1_power ();
diff --git a/src/ines.c b/src/ines.c
index 50254bd..eb5ea51 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -909,6 +909,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "KS7009",         		486, Mapper486_Init         )
 	INES_BOARD( "AVE NINA-08",    		487, Mapper487_Init         )
 	INES_BOARD( "HC001",    		488, Mapper488_Init         )
+	INES_BOARD( "K-3011",                   498, Mapper498_Init         )
 	INES_BOARD( "Yhc-000",                  500, Mapper500_Init         )
 	INES_BOARD( "Yhc-001",                  501, Mapper501_Init         )
 	INES_BOARD( "Yhc-002",                  502, Mapper502_Init         )
diff --git a/src/ines.h b/src/ines.h
index 168610a..e532a34 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -389,6 +389,7 @@ void Mapper485_Init(CartInfo *);
 void Mapper486_Init(CartInfo *);
 void Mapper487_Init(CartInfo *);
 void Mapper488_Init(CartInfo *);
+void Mapper498_Init(CartInfo *);
 void Mapper500_Init(CartInfo *);
 void Mapper501_Init(CartInfo *);
 void Mapper502_Init(CartInfo *);