From d81416649fc3f8020b19f693eac6656a2ed47ab9 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Wed, 10 Sep 2025 22:51:02 +0200
Subject: [PATCH] Add mapper 564.

---
 src/boards/564.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 47 insertions(+)
 create mode 100644 src/boards/564.c

diff --git a/src/boards/564.c b/src/boards/564.c
new file mode 100644
index 0000000..94fa23c
--- /dev/null
+++ b/src/boards/564.c
@@ -0,0 +1,45 @@
+/* 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 () {
+	setprg32(0x8000, Latch_data);
+	setchr8(0);
+	if (Latch_data &0x20)
+		setmirror(Latch_data &0x10? MI_1: MI_0);
+	else
+		setmirror(Latch_data &0x10? MI_H: MI_V);
+}
+
+static void trapLatchWrite (uint16 *newAddress, uint8 *newValue, uint8 romValue) { /* After the lock bit is set, only update the (mode-specific) inner bank bits. */
+	if (Latch_data &0x20) {
+		if (Latch_data &0x08)
+			*newValue = Latch_data &0x28 | *newValue &~0x28; /* AOROM */
+		else
+			*newValue = Latch_data &0x2C | *newValue &~0x2C; /* ANROM */
+	}
+}
+
+void Mapper564_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, trapLatchWrite);
+	info->Reset = Latch_clear;
+}
diff --git a/src/ines.c b/src/ines.c
index d712588..a371765 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -970,6 +970,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Bung Super Game Doctor",   561, Mapper561_562_Init     )
 	INES_BOARD( "Venus Turbo Game Doctor",  562, Mapper561_562_Init     )
 	INES_BOARD( "J-2020",                   563, Mapper563_Init         )
+	INES_BOARD( "bd23.pcb",                 564, Mapper564_Init         )
 	INES_BOARD( "ET-149",                   566, Mapper566_Init         )
 	INES_BOARD( "Top Ten Variety (SF III)", 567, Mapper567_Init         )
 	INES_BOARD( "T-227",                    568, Mapper568_Init         )
diff --git a/src/ines.h b/src/ines.h
index de5fac7..d494b40 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -436,6 +436,7 @@ void Mapper558_Init(CartInfo *);
 void Mapper559_Init(CartInfo *);
 void Mapper561_562_Init(CartInfo *);
 void Mapper563_Init(CartInfo *);
+void Mapper564_Init(CartInfo *);
 void Mapper566_Init(CartInfo *);
 void Mapper567_Init(CartInfo *);
 void Mapper568_Init(CartInfo *);