From 84126a581c3176993ec91599c08f6438e3abedd3 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Sun, 8 Feb 2026 12:40:47 +0100
Subject: [PATCH] Added mapper 610.

---
 src/boards/610.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 59 insertions(+)
 create mode 100644 src/boards/610.c

diff --git a/src/boards/610.c b/src/boards/610.c
new file mode 100644
index 0000000..70f23e1
--- /dev/null
+++ b/src/boards/610.c
@@ -0,0 +1,57 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2026 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 uint8 reg;
+
+static void sync () {
+	if (reg &0x10) { /* NROM-128 mode */
+		setprg16(0x8000, reg <<1);
+		setprg16(0xC000, reg <<1);
+	} else /* NROM-256 mode */
+		setprg32(0x8000, reg);
+	setchr8(reg <<2 | Latch_data &0x03);
+	setmirror(reg &0x08? MI_H: MI_V);
+}
+
+static DECLFW (writeReg) {
+	reg = V;
+	sync();
+}
+
+static void reset () {
+	reg = 0;
+	Latch_clear();
+}
+
+static void power () {
+	Latch_power();
+	SetWriteHandler(0x5000, 0x5FFF, writeReg);
+	reset();
+}
+
+void Mapper610_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, NULL);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "REGS");
+}
diff --git a/src/ines.c b/src/ines.c
index b22f501..932c7e2 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -1027,6 +1027,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "4705",                     607, Mapper607_Init         )
 	INES_BOARD( "A-23",                     608, Mapper608_Init         )
 	INES_BOARD( "63-100",                   609, Mapper609_Init         )
+	INES_BOARD( "J-2042",                   610, Mapper610_Init         )
 INES_BOARD_END()
 
 static uint32 iNES_get_mapper_id(void)
diff --git a/src/ines.h b/src/ines.h
index 44067a4..aa070f3 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -496,6 +496,7 @@ void Mapper606_Init(CartInfo *);
 void Mapper607_Init(CartInfo *);
 void Mapper608_Init(CartInfo *);
 void Mapper609_Init(CartInfo *);
+void Mapper610_Init(CartInfo *);
 void FFE_Init(CartInfo *);
 
 #endif