diff --git a/src/boards/268.c b/src/boards/268.c
index 02de195..be2895e 100644
--- a/src/boards/268.c
+++ b/src/boards/268.c
@@ -66,6 +66,14 @@ static void Mapper268_PRGWrap(uint32 A, uint8 V) {
 		prgOffset &=ROM_size -1;
 		if (EXPREGS[0] &0x80? !!(EXPREGS[0] &0x08): !!(DRegBuf[0] &0x80)) prgOffset |=ROM_size;
 		break;
+	case 8: /* 2 MiB regular plus extra latch, CHR-RAM protection */
+		prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x02? 0x03: 0x01): 0x00;
+		prgOffset    =EXPREGS[3]     &0x00E 
+			     |EXPREGS[0] <<4 &0x070
+			     |EXPREGS[1] <<3 &0x080
+			     |EXPREGS[6] <<8 &0x300
+			     |EXPREGS[6] <<6 &0xC00;
+		break;
 	}
 	prgOffset &=~(prgMaskMMC3 | prgMaskGNROM);
 	setprg8(A, V &prgMaskMMC3 | prgOffset | A >>13 &prgMaskGNROM);
@@ -79,7 +87,7 @@ static void Mapper268_CHRWrap(uint32 A, uint8 V) {
 	
 	chrMaskMMC3  =EXPREGS[3] &0x10? 0x00: EXPREGS[0] &0x80? 0x7F: 0xFF;
 	chrMaskGNROM =EXPREGS[3] &0x10? 0x07: 0x00;
-	chrOffset    =EXPREGS[0] <<4 &0x380 | EXPREGS[2] <<3 &0x078;
+	chrOffset    =EXPREGS[0] <<9 &0xC00 | EXPREGS[0] <<4 &0x380 | EXPREGS[2] <<3 &0x078;
 	chrOffset   &=~(chrMaskMMC3 | chrMaskGNROM);
 	
 	setchr1r(CHRRAM && EXPREGS[4] &0x01 && (V &0xFE) ==(EXPREGS[4] &0xFE)? 0x10: 0x00, A, V &chrMaskMMC3 | chrOffset | A >>10 &chrMaskGNROM);
@@ -108,21 +116,31 @@ static DECLFW(Mapper268_WriteReg) {
 		if (index ==2) {
 			if (EXPREGS[2] &0x80) V =V &0x0F | EXPREGS[2] &~0x0F;
 			V &=~EXPREGS[2] >>3 &0xE |0xF1;
-		}		
-		EXPREGS[index] =V;
-		FixMMC3PRG(MMC3_cmd);
-		FixMMC3CHR(MMC3_cmd);
-		Mapper268_MirrorWrap(A000B);
+		}
+		
+		if ((submapper &~1) == 8 && index == 1 && V &0x04 && V &0x08) { /* Latch clocking another latch */
+			EXPREGS[6] = V;
+			FixMMC3PRG(MMC3_cmd);
+			FixMMC3CHR(MMC3_cmd);
+			Mapper268_MirrorWrap(A000B);
+		}
+		
+		if (index <= 5) {
+			EXPREGS[index] =V;
+			FixMMC3PRG(MMC3_cmd);
+			FixMMC3CHR(MMC3_cmd);
+			Mapper268_MirrorWrap(A000B);
+		}
 	}
 }
 
 static void Mapper268_Reset(void) {
-	EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =EXPREGS[5] =0;
+	EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =EXPREGS[5] =EXPREGS[6] =0;
 	MMC3RegReset();
 }
 
 static void Mapper268_Power(void) {	
-	EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =EXPREGS[5] =0;
+	EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =EXPREGS[5] =EXPREGS[6] =0;
 	GenMMC3Power();
 	SetReadHandler(0x6000, 0x7FFF, Mapper268_ReadWRAM);
 	if (submapper &1) {
diff --git a/src/boards/596.c b/src/boards/596.c
new file mode 100644
index 0000000..d62c447
--- /dev/null
+++ b/src/boards/596.c
@@ -0,0 +1,63 @@
+/* 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 () {
+	int prgAND = reg &0x04? 0x1F: 0x0F;
+	int chrAND = 0x7F;
+	int prgOR  = reg <<4;
+	int chrOR  = reg <<7;
+	MMC3_syncWRAM(0);
+	MMC3_syncPRG(prgAND, prgOR &~prgAND);
+	MMC3_syncCHR(chrAND, chrOR &~chrAND);
+	MMC3_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	if (~reg &0x08) {
+		reg = V;
+		sync();
+	}
+}
+
+static void reset () {
+	reg = 0;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC3_power();
+}
+
+void Mapper596_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/ines.c b/src/ines.c
index ba9338c..f8ef459 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -1017,6 +1017,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "8-in-1 1991",              592, Mapper592_Init         )
 	INES_BOARD( "Rinco FSG2",               594, Mapper594_Init         )
 	INES_BOARD( "4MROM-512",                595, Mapper595_Init         )
+	INES_BOARD( "FC-49",                    596, Mapper596_Init         )
 INES_BOARD_END()
 
 static uint32 iNES_get_mapper_id(void)
diff --git a/src/ines.h b/src/ines.h
index 1c48ffd..d9f9c62 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -486,6 +486,7 @@ void Mapper591_Init(CartInfo *);
 void Mapper592_Init(CartInfo *);
 void Mapper594_Init(CartInfo *);
 void Mapper595_Init(CartInfo *);
+void Mapper596_Init(CartInfo *);
 
 void FFE_Init(CartInfo *);