diff --git a/src/boards/361.c b/src/boards/361.c
new file mode 100644
index 0000000..6d0f6f9
--- /dev/null
+++ b/src/boards/361.c
@@ -0,0 +1,54 @@
+/* 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 () {
+	MMC3_syncPRG(0x0F, reg &~0x0F);
+	MMC3_syncCHR(0x7F, reg <<3 &~0x7F);
+	MMC3_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	reg = V;
+	sync();
+}
+
+static void reset () {
+	reg = 0;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC3_power();
+}
+
+void Mapper361_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/boards/366.c b/src/boards/366.c
new file mode 100644
index 0000000..4307bd1
--- /dev/null
+++ b/src/boards/366.c
@@ -0,0 +1,59 @@
+/* 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"
+#include "cartram.h"
+
+static uint8 reg;
+
+static void sync () {
+	MMC3_syncWRAM(0);
+	MMC3_syncPRG(0x0F, reg &~0x0F);
+	MMC3_syncCHR(0x7F, reg <<3 &~0x7F);
+	MMC3_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	if (~reg &0x80) {
+		reg = A &0xFF;
+		sync();
+	}
+}
+
+static void reset () {
+	reg = 0;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC3_power();
+}
+
+void Mapper366_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, writeReg);
+	WRAM_init(info, 8);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+}
diff --git a/src/boards/mmc3.c b/src/boards/mmc3.c
index de88f2d..978b57e 100644
--- a/src/boards/mmc3.c
+++ b/src/boards/mmc3.c
@@ -1311,12 +1311,12 @@ void Mapper367_Init(CartInfo *info) {
 /* Mapper 361 and 366, previously assigned as Mapper 205 */
 static void GN45PW(uint32 A, uint8 V) {
 /* GN-30A - \ED\E0\F7\E0\EB\FC\ED\E0\FF \EC\E0\F1\EA\E0 \E4\EE\EB\E6\ED\E0 \E1\FB\F2\FC 1F + \E0\EF\EF\E0\F0\E0\F2\ED\FB\E9 \EF\E5\F0\E5\EA\EB\FE\F7\E0\F2\E5\EB\FC \ED\E0 \F8\E8\ED\E5 \E0\E4\F0\E5\F1\E0 */
-	setprg8(A, (V & 0x0f) | EXPREGS[0]);
+	setprg8(A, (V & 0x0f) | EXPREGS[0] &~0x0F);
 }
 
 static void GN45CW(uint32 A, uint8 V) {
 /* GN-30A - \ED\E0\F7\E0\EB\FC\ED\E0\FF \EC\E0\F1\EA\E0 \E4\EE\EB\E6\ED\E0 \E1\FB\F2\FC FF */
-	setchr1(A, (V & 0x7F) | (EXPREGS[0] << 3));
+	setchr1(A, (V & 0x7F) | (EXPREGS[0] << 3 &~0x7F));
 }
 
 static DECLFW(GN45Write0) {
diff --git a/src/ines.c b/src/ines.c
index 149449f..566864b 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -805,11 +805,11 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "YY860606C",                358, Mapper358_Init         )
 	INES_BOARD( "SB-5013/GCL8050/841242C",  359, Mapper359_Init         )
 	INES_BOARD( "Bitcorp 31-in-1",          360, Mapper360_Init         )
-	INES_BOARD( "OK-411",                   361, GN45_Init              ) /* OK-411 is emulated together with GN-45 */
+	INES_BOARD( "OK-411",                   361, Mapper361_Init         )
 	INES_BOARD( "830506C",                  362, Mapper362_Init         )
 	INES_BOARD( "5069",                     363, Mapper363_Init         )
 	INES_BOARD( "JY830832C",                364, Mapper364_Init         )
-	INES_BOARD( "GN-45",                    366, GN45_Init              )
+	INES_BOARD( "GN-45",                    366, Mapper366_Init          )
 	INES_BOARD( "JC-016-2 variant",         367, Mapper367_Init         )
 	INES_BOARD( "Yung-08",                  368, Mapper368_Init         )
 	INES_BOARD( "N49C-300",                 369, Mapper369_Init         )
diff --git a/src/ines.h b/src/ines.h
index c58d527..67fb359 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -251,8 +251,6 @@ void Mapper252_Init(CartInfo *);
 void Mapper253_Init(CartInfo *);
 void Mapper254_Init(CartInfo *);
 void Mapper255_Init(CartInfo *);
-
-void GN45_Init(CartInfo *info); /* m361, m366 */
 void Mapper270_Init(CartInfo *);
 void Mapper272_Init(CartInfo *);
 void Mapper273_Init(CartInfo *);
@@ -290,9 +288,11 @@ void Mapper357_Init(CartInfo *);
 void Mapper358_Init(CartInfo *);
 void Mapper359_Init(CartInfo *);
 void Mapper360_Init(CartInfo *);
+void Mapper361_Init(CartInfo *);
 void Mapper362_Init(CartInfo *);
 void Mapper363_Init(CartInfo *);
 void Mapper364_Init(CartInfo *);
+void Mapper366_Init(CartInfo *);
 void Mapper367_Init(CartInfo *);
 void Mapper368_Init(CartInfo *);
 void Mapper369_Init(CartInfo *);