diff --git a/src/boards/581.c b/src/boards/581.c
index 2435623..54dbce4 100644
--- a/src/boards/581.c
+++ b/src/boards/581.c
@@ -38,11 +38,8 @@ static void sync () {
 	setmirror(Latch_address &0x80? MI_H: MI_V);
 }
 
-static void trapLatchWrite (uint16 *newAddress, uint8 *newValue, uint8 romValue) { /* The upper bits are only writable on a falling edge of A5. */
-	if (Latch_address &0x20 && !(*newAddress &0x20))
-		;
-	else
-		*newAddress = *newAddress &~0xC0 | Latch_address &0xC0;
+static void trapLatchWrite (uint16 *newAddress, uint8 *newValue, uint8 romValue) { /* The upper two address bits are only updated on a falling edge of A5. */
+	if (!(Latch_address &0x20 && ~*newAddress &0x20)) *newAddress = *newAddress &~0xC0 | Latch_address &0xC0;
 }
 
 void Mapper581_Init (CartInfo *info) {
diff --git a/src/boards/588.c b/src/boards/588.c
index a656607..4021269 100644
--- a/src/boards/588.c
+++ b/src/boards/588.c
@@ -22,12 +22,6 @@
 
 static uint8 reg[2];
 
-static SFORMAT stateRegs[] = {
-	{ &reg,         2, "REGS" },
-	{ 0 }
-};
-
-
 static void sync () {
 	setprg8(0x6000, reg[1] &0x07 |0x08);
 	setprg32(0x8000, reg[0] >>4 &0x07);
@@ -55,5 +49,5 @@ void Mapper588_Init (CartInfo *info) {
 	info->Reset = power;
 	info->Power = power;
 	GameStateRestore = stateRestore;
-	AddExState(stateRegs, ~0, 0, 0);
+	AddExState(reg, 2, 0, "REGS");
 }
diff --git a/src/boards/589.c b/src/boards/589.c
new file mode 100644
index 0000000..a613f08
--- /dev/null
+++ b/src/boards/589.c
@@ -0,0 +1,43 @@
+/* FCE Ultra - 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 "asic_latch.h"
+
+static void sync () {
+	if (Latch_address &0x20) { /* First chip: 256 KiB */
+		setprg16(0x8000, Latch_address >>1 &0x08 | Latch_data &0x07);
+		setprg16(0xC000, Latch_address >>1 &0x08 | 0x07);
+	} else { /* Second chip: 128 KiB (boot) */
+		setprg16(0x8000, 0x10 | Latch_address >>1 &0x07);
+		setprg16(0xC000, 0x10 | Latch_address >>1 &0x07);
+	}
+	setchr8(0);
+	setmirror(Latch_address &1? MI_H: MI_V);
+}
+
+static void trapLatchWrite (uint16 *newAddress, uint8 *newValue, uint8 romValue) { /* The address bits are only updated on a falling edge of D3. */
+	if (!(Latch_data &0x08 && ~*newValue &0x08)) *newAddress = Latch_address;
+}
+
+void Mapper589_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, trapLatchWrite);
+	info->Reset = Latch_power;
+}
diff --git a/src/boards/591.c b/src/boards/591.c
new file mode 100644
index 0000000..d2f3ad1
--- /dev/null
+++ b/src/boards/591.c
@@ -0,0 +1,38 @@
+/* FCE Ultra - 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 "asic_latch.h"
+
+static void sync () {
+	if ((Latch_address &0x0C) == 0x0C)
+		setprg32(0x8000, Latch_address >>2);
+	else {
+		setprg16(0x8000, Latch_address >>1);
+		setprg16(0xC000, Latch_address >>1);
+	}
+	setchr8(Latch_address);
+	setmirror(Latch_address &0x08? MI_V: MI_H);
+}
+
+void Mapper591_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, NULL);
+	info->Reset = Latch_power;
+}
diff --git a/src/ines.c b/src/ines.c
index 77957e7..139f2aa 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -954,7 +954,9 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "ET-82",                    581, Mapper581_Init         )
 	INES_BOARD( "HN-02",                    586, Mapper586_Init         )
 	INES_BOARD( "ET-81",                    588, Mapper588_Init         )
+	INES_BOARD( "810706",                   589, Mapper589_Init         )
 	INES_BOARD( "810430",                   590, Mapper590_Init         )
+	INES_BOARD( "07027/810543",             591, Mapper591_Init         )
 	INES_BOARD( "8-in-1 1991",              592, Mapper592_Init         )
 INES_BOARD_END()
 
diff --git a/src/ines.h b/src/ines.h
index a8e4590..842b4c5 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -419,7 +419,9 @@ void Mapper579_Init(CartInfo *);
 void Mapper581_Init(CartInfo *);
 void Mapper586_Init(CartInfo *);
 void Mapper588_Init(CartInfo *);
+void Mapper589_Init(CartInfo *);
 void Mapper590_Init(CartInfo *);
+void Mapper591_Init(CartInfo *);
 void Mapper592_Init(CartInfo *);
 
 void FFE_Init(CartInfo *);