From 03a761fa911311041bd0a8daa80abc39b22ac4e0 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Tue, 9 Sep 2025 22:03:21 +0200
Subject: [PATCH] Add mapper 508.

---
 src/boards/508.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 72 insertions(+)
 create mode 100644 src/boards/508.c

diff --git a/src/boards/508.c b/src/boards/508.c
new file mode 100644
index 0000000..9a8a16b
--- /dev/null
+++ b/src/boards/508.c
@@ -0,0 +1,70 @@
+/* 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 uint8 reg;
+static uint8 pad;
+
+static void sync () {
+	if (reg &0x80)
+		MMC3_syncPRG(0x1F, reg >>1 &~0x1F);
+	else
+	if (reg &0x20)
+		setprg32(0x8000, (reg &0x0F | reg >>2 &~0x0F) >>1);
+	else {
+		setprg16(0x8000, reg &0x0F | reg >>2 &~0x0F);
+		setprg16(0xC000, reg &0x0F | reg >>2 &~0x0F);
+	}
+	setchr8(0);
+	MMC3_syncMirror();
+}
+
+static DECLFR (readPad) {
+	return pad;
+}
+
+static DECLFW (writeReg) {
+	reg = V;
+	sync();
+}
+
+static void reset () {
+	reg = 0x0F;
+	pad++;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0x0F;
+	pad = 0;
+	MMC3_power();
+}
+
+void Mapper508_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, readPad, writeReg);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+	AddExState(&pad, 1, 0, "DIPS");
+}
diff --git a/src/ines.c b/src/ines.c
index cc48f6b..50254bd 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -915,6 +915,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "ET-170",                   503, Mapper503_Init         )
 	INES_BOARD( "K-3054",                   504, Mapper504_Init         )
 	INES_BOARD( "GA-009",                   506, Mapper506_Init         )
+	INES_BOARD( "JY-014",                   508, Mapper508_Init         )
 	INES_BOARD( "K-3022",                   509, Mapper509_Init         )
 	INES_BOARD( "FC-53A",                   510, Mapper510_Init         )
 	INES_BOARD( "1n4148",                   511, Mapper511_Init         )
diff --git a/src/ines.h b/src/ines.h
index c37a89c..168610a 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -395,6 +395,7 @@ void Mapper502_Init(CartInfo *);
 void Mapper503_Init(CartInfo *);
 void Mapper504_Init(CartInfo *);
 void Mapper506_Init(CartInfo *);
+void Mapper508_Init(CartInfo *);
 void Mapper509_Init(CartInfo *);
 void Mapper510_Init(CartInfo *);
 void Mapper511_Init(CartInfo *);