diff --git a/src/boards/588.c b/src/boards/588.c
new file mode 100644
index 0000000..a656607
--- /dev/null
+++ b/src/boards/588.c
@@ -0,0 +1,59 @@
+/* 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"
+
+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);
+	setchr8(reg[0] &0x0F);
+	setmirror(reg[0] &0x80? MI_H: MI_V);
+}
+
+static DECLFW(writeReg) {
+	reg[A >>12 &1] = V;
+	sync();
+}
+
+static void power() {
+	SetReadHandler(0x6000, 0xFFFF, CartBR);
+	SetWriteHandler(0xE000, 0xFFFF, writeReg);
+	reg[0] = reg[1] = 0;
+	sync();
+}
+
+static void stateRestore(int version) {
+	sync();
+}
+
+void Mapper588_Init (CartInfo *info) {
+	info->Reset = power;
+	info->Power = power;
+	GameStateRestore = stateRestore;
+	AddExState(stateRegs, ~0, 0, 0);
+}
diff --git a/src/boards/592.c b/src/boards/592.c
new file mode 100644
index 0000000..6464e04
--- /dev/null
+++ b/src/boards/592.c
@@ -0,0 +1,34 @@
+/* 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 () {
+	setprg16(0x8000, Latch_data);
+	setprg16(0xC000, Latch_data);
+	setchr8(Latch_data);
+	setmirror(Latch_data &0x08? MI_H: MI_V);
+}
+
+void Mapper592_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 bd4d6ef..e7f3d19 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -950,6 +950,8 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "J-2020",                   563, Mapper563_Init         )
 	INES_BOARD( "T-215",                    579, Mapper579_Init         )
 	INES_BOARD( "HN-02",                    586, Mapper586_Init         )
+	INES_BOARD( "ET-81",                    588, Mapper588_Init         )
+	INES_BOARD( "8-in-1 1991",              592, Mapper592_Init         )
 INES_BOARD_END()
 
 static uint32 iNES_get_mapper_id(void)
diff --git a/src/ines.h b/src/ines.h
index 423ba96..ebb8e70 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -415,6 +415,8 @@ void Mapper561_562_Init(CartInfo *);
 void Mapper563_Init(CartInfo *);
 void Mapper579_Init(CartInfo *);
 void Mapper586_Init(CartInfo *);
+void Mapper588_Init(CartInfo *);
+void Mapper592_Init(CartInfo *);
 
 void FFE_Init(CartInfo *);