From e8f1cd53ebd1a1fd09299625f64394b86a70e8dd Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Mon, 7 Feb 2022 15:23:44 +0800
Subject: [PATCH] Add mapper 334

---
 src/boards/334.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 67 insertions(+)
 create mode 100644 src/boards/334.c

diff --git a/src/boards/334.c b/src/boards/334.c
new file mode 100644
index 0000000..8dcfed0
--- /dev/null
+++ b/src/boards/334.c
@@ -0,0 +1,65 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2020 negativeExponent
+ *
+ * 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 "mmc3.h"
+
+static uint8 dipswitch;
+
+static void M334PW(uint32 A, uint8 V) {
+    setprg32(0x8000, EXPREGS[0] >> 1);
+}
+
+static DECLFW(M334Write) {
+    if (!(A & 1)) {
+        EXPREGS[0] = V;
+        FixMMC3PRG(MMC3_cmd);
+    }
+}
+
+static DECLFR(M334Read) {
+    if (A & 2)
+        return ((X.DB & 0xFE) | (dipswitch & 1));
+    return X.DB;
+}
+
+static void M334Reset(void) {
+    dipswitch++;
+	EXPREGS[0] = 0;
+	MMC3RegReset();
+}
+
+static void M334Power(void) {
+    dipswitch = 0;
+	EXPREGS[0] = 0;
+	GenMMC3Power();
+    SetReadHandler(0x6000, 0x7FFF, M334Read);
+	SetWriteHandler(0x6000, 0x7FFF, M334Write);
+}
+
+void Mapper334_Init(CartInfo *info) {
+	GenMMC3_Init(info, 32, 32, 0, 0);
+	pwrap = M334PW;
+	info->Power = M334Power;
+	info->Reset = M334Reset;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index a4195c8..52fe24a 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -686,6 +686,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "GKCX1",                    288, Mapper288_Init         )
 	INES_BOARD( "MMC3 BMC PIRATE",          294, Bs5652_Init ) /* nesdev redirects this as mapper 134 */
 	INES_BOARD( "TXC 01-22110-000",         297, Mapper297_Init         )
+	INES_BOARD( "5/20-in-1 1993 Copyright", 334, Mapper334_Init         )
 	INES_BOARD( "Super Mario Family",       353, Mapper353_Init         )
 	INES_BOARD( "7-in-1 Rockman (JY-208)",  356, Mapper356_Init         )
 	INES_BOARD( "Bit Corp 4-in-1",          357, Mapper357_Init         )
diff --git a/src/ines.h b/src/ines.h
index abdfad7..b506702 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -262,6 +262,7 @@ void Mapper288_Init(CartInfo *);
 void Mapper293_Init(CartInfo *);
 void Mapper297_Init(CartInfo *);
 void Mapper319_Init(CartInfo *);
+void Mapper334_Init(CartInfo *);
 void Mapper353_Init(CartInfo *);
 void Mapper356_Init(CartInfo *);
 void Mapper357_Init(CartInfo *);