From 80df4283af4c53724122f15e6906e0e93317f9ed Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Tue, 9 Sep 2025 21:58:47 +0200
Subject: [PATCH] Add mapper 509.

---
 src/boards/509.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 73 insertions(+)
 create mode 100644 src/boards/509.c

diff --git a/src/boards/509.c b/src/boards/509.c
new file mode 100644
index 0000000..f13e678
--- /dev/null
+++ b/src/boards/509.c
@@ -0,0 +1,71 @@
+/* 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"
+#include "wram.h"
+
+static uint8 reg;
+
+static void sync () {
+	int prgAND = reg &0x10? 0x1F: 0x0F;
+	int chrAND = reg &0x10? 0xFF: 0x7F;
+	int prgOR = reg <<1;
+	int chrOR = reg <<4;
+	if (reg &0x20)
+		MMC3_syncPRG(prgAND, prgOR &~prgAND);
+	else
+	if (reg &0x06)
+		setprg32(0x8000, reg >>1);
+	else {
+		setprg16(0x8000, reg);
+		setprg16(0xC000, reg);
+	}
+	MMC3_syncCHR(chrAND, chrOR &~chrAND);
+	MMC3_syncWRAM(0);
+	MMC3_syncMirror();
+}
+
+static DECLFW (writeReg) {
+	if (~reg &0x20) {
+		reg = A &0xFF;
+		sync();
+	}
+}
+
+static void reset () {
+	reg = 0;
+	MMC3_clear();
+}
+
+static void power () {
+	reg = 0;
+	MMC3_power();
+}
+
+void Mapper509_Init (CartInfo *info) {
+	MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, writeReg);
+	WRAM_init(info, 8);
+	info->Power = power;
+	info->Reset = reset;
+	AddExState(&reg, 1, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index 8c50877..cc48f6b 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( "K-3022",                   509, Mapper509_Init         )
 	INES_BOARD( "FC-53A",                   510, Mapper510_Init         )
 	INES_BOARD( "1n4148",                   511, Mapper511_Init         )
 	INES_BOARD( "Zhonggguo Daheng",         512, Mapper512_Init         )
diff --git a/src/ines.h b/src/ines.h
index 32bd5b9..c37a89c 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 Mapper509_Init(CartInfo *);
 void Mapper510_Init(CartInfo *);
 void Mapper511_Init(CartInfo *);
 void Mapper512_Init(CartInfo *);