From 9eb4a4c233dbf9729b37fc06754d0af6f42bab0b Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Tue, 9 Sep 2025 22:30:23 +0200
Subject: [PATCH] Add mapper 505.

---
 src/boards/505.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 67 insertions(+)
 create mode 100644 src/boards/505.c

diff --git a/src/boards/505.c b/src/boards/505.c
new file mode 100644
index 0000000..82027eb
--- /dev/null
+++ b/src/boards/505.c
@@ -0,0 +1,65 @@
+/* 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"
+
+static uint16 reg;
+static uint8 pad;
+
+static void sync () {
+	if (reg &0x01)
+		MMC3_syncPRG(0x1F, reg &0x60);
+	else
+		setprg32(0x8000, reg >>2);
+	MMC3_syncCHR(reg &0x100? 0x7F: 0xFF, reg >>1 &0x100 | reg &0x080);
+	MMC3_syncMirror();
+}
+
+static DECLFR (readPad) {
+	return pad;
+}
+
+static DECLFW (writeReg) {
+	reg = A ^0x1C;
+	sync();
+}
+
+static void reset () {
+	reg = 0xFE;
+	pad++;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0xFE;
+	pad = 0;
+	MMC3_power();
+}
+
+void Mapper505_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, readPad, writeReg);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 2, 0, "EXPR");
+	AddExState(&pad, 1, 0, "DIPS");
+}
diff --git a/src/ines.c b/src/ines.c
index 2154039..9ef3e89 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -915,6 +915,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Yhc-002",                  502, Mapper502_Init         )
 	INES_BOARD( "ET-170",                   503, Mapper503_Init         )
 	INES_BOARD( "K-3054",                   504, Mapper504_Init         )
+	INES_BOARD( "5426757A-Y2-230630",       505, Mapper505_Init         )
 	INES_BOARD( "GA-009",                   506, Mapper506_Init         )
 	INES_BOARD( "A-018",                    507, Mapper507_Init         )
 	INES_BOARD( "JY-014",                   508, Mapper508_Init         )
diff --git a/src/ines.h b/src/ines.h
index 66e44fe..d900670 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -395,6 +395,7 @@ void Mapper501_Init(CartInfo *);
 void Mapper502_Init(CartInfo *);
 void Mapper503_Init(CartInfo *);
 void Mapper504_Init(CartInfo *);
+void Mapper505_Init(CartInfo *);
 void Mapper506_Init(CartInfo *);
 void Mapper507_Init(CartInfo *);
 void Mapper508_Init(CartInfo *);