From 78064f4a448aae2b49a0ae0be18186497cf8b1f7 Mon Sep 17 00:00:00 2001
From: libretroadmin <reallibretroretroarch@gmail.com>
Date: Fri, 24 May 2024 06:56:09 +0200
Subject: [PATCH] Add missing mapper 439

---
 src/boards/439.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/boards/439.c

diff --git a/src/boards/439.c b/src/boards/439.c
new file mode 100644
index 0000000..281c9ad
--- /dev/null
+++ b/src/boards/439.c
@@ -0,0 +1,73 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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
+ */
+
+/* NES 2.0 Mapper 439 denotes the YS2309 multicart PCB.
+ * Its UNIF MAPRs are BMC-DS-07 and BMC-K86B.
+ */
+
+#include "mapinc.h"
+#include "latch.h"
+
+static uint8 reg[2];
+
+static void Sync(void)
+{
+	setprg16(0x8000, ((reg[0] >> 1) & ~7) | latch.data & 7);
+	setprg16(0xC000, ((reg[0] >> 1) & ~7) | 7);
+	setchr8(0);
+	setmirror(((latch.data >> 7) & 1) ^ 1);
+}
+
+static DECLFW(M439WriteReg)
+{
+    reg[A & 1] = V;
+    Sync();
+}
+
+static DECLFW(M439WriteLatch)
+{
+    if (!(reg[0] & 0x80))
+        latch.data = (latch.data & ~7) | (V & 7);
+    else
+        latch.data = V;
+    Sync();
+}
+
+static void M439Reset(void)
+{
+    reg[0] = reg[1] = ~0;
+    LatchHardReset();
+}
+
+static void M439Power(void)
+{
+    reg[0] = reg[1] = ~0;
+    LatchPower();
+    SetWriteHandler(0x6000, 0x7FFF, M439WriteReg);
+    SetWriteHandler(0x8000, 0xFFFF, M439WriteLatch);
+}
+
+void Mapper439_Init(CartInfo *info)
+{
+	Latch_Init(info, Sync, NULL, 0, 1);
+   info->Power = M439Power;
+   info->Reset = M439Reset;
+   AddExState(reg, 2, 0, "REGS");
+}