diff --git a/src/boards/566.c b/src/boards/566.c
new file mode 100644
index 0000000..592fd11
--- /dev/null
+++ b/src/boards/566.c
@@ -0,0 +1,61 @@
+/* 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_mmc3.h"
+
+static uint8 reg;
+
+static void sync () {
+	int prgAND = reg &0x04? 0x0F: 0x1F;
+	int chrAND = reg &0x02? 0x7F: 0xFF;
+	int prgOR = reg <<4 &0x10 | reg <<2 &0x20 | reg <<1 &0xC0;
+	int chrOR = reg <<7 &0x80 | reg <<4 &0x700;
+	MMC3_syncPRG(prgAND, prgOR &~prgAND);
+	MMC3_syncCHR(chrAND, chrOR &~chrAND);
+	if (reg &0x80)
+		setmirror(MMC3_getCHRBank(0) &0x80? MI_1: MI_0);
+	else
+		MMC3_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	reg = A &0xFF;
+	sync();
+}
+
+static void reset () {
+	reg = 0;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC3_power();
+}
+
+void Mapper566_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, writeReg);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index e5b2eb6..b64cb24 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -951,6 +951,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Bung Super Game Doctor",   561, Mapper561_562_Init     )
 	INES_BOARD( "Venus Turbo Game Doctor",  562, Mapper561_562_Init     )
 	INES_BOARD( "J-2020",                   563, Mapper563_Init         )
+	INES_BOARD( "ET-149",                   566, Mapper566_Init         )
 	INES_BOARD( "Top Ten Variety (SF III)", 567, Mapper567_Init         )
 	INES_BOARD( "T-227",                    568, Mapper568_Init         )
 	INES_BOARD( "820315-C",                 569, Mapper569_Init         )
diff --git a/src/ines.h b/src/ines.h
index 225df50..ed48f1d 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -417,6 +417,7 @@ void Mapper558_Init(CartInfo *);
 void Mapper559_Init(CartInfo *);
 void Mapper561_562_Init(CartInfo *);
 void Mapper563_Init(CartInfo *);
+void Mapper566_Init(CartInfo *);
 void Mapper567_Init(CartInfo *);
 void Mapper568_Init(CartInfo *);
 void Mapper569_Init(CartInfo *);