From e734fa87965c272391fce046923123af875bf096 Mon Sep 17 00:00:00 2001
From: retro-wertz <retro-wertz@users.noreply.github.com>
Date: Wed, 26 Jun 2019 23:51:19 +0800
Subject: [PATCH] Add support for BMC-GN-26

---
 src/boards/gn26.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++
 src/unif.c        |  1 +
 src/unif.h        |  1 +
 3 files changed, 70 insertions(+)
 create mode 100644 src/boards/gn26.c

diff --git a/src/boards/gn26.c b/src/boards/gn26.c
new file mode 100644
index 0000000..a712cc2
--- /dev/null
+++ b/src/boards/gn26.c
@@ -0,0 +1,68 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *
+ *
+ * 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 344
+ * BMC-GN-26
+ * Kuai Da Jin Ka Zhong Ji Tiao Zhan 3-in-1 (3-in-1,6-in-1,Unl)
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void BMCGN26CW(uint32 A, uint8 V) {
+	uint32 chip = (EXPREGS[0] & 0x03);
+	if (chip) chip -= 1;
+	setchr1r(chip, A, (V & 0xFF));
+}
+
+static void BMCGN26PW(uint32 A, uint8 V) {
+	uint32 chip = (EXPREGS[0] & 0x03);
+	if (chip) chip -= 1; /* Re-ordered -> 0:SF4 1:Contra Force 2:Revolution Hero */
+	if (EXPREGS[0] & 4) {
+		if (A == 0x8000)
+			setprg32r(chip, 0x8000, (V >> 2));
+	} else
+		setprg8r(chip, A, (V & 0x0F));
+}
+
+static DECLFW(BMCGN26Write) {
+	EXPREGS[0] = A & 0x0F;
+	FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static void BMCGN26Reset(void) {
+	EXPREGS[0] = 0;
+	MMC3RegReset();
+}
+
+static void BMCGN26Power(void) {
+	GenMMC3Power();
+	SetWriteHandler(0x6800, 0x68FF, BMCGN26Write);
+}
+
+void BMCGN26_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 256, 1, 0);
+	pwrap = BMCGN26PW;
+	cwrap = BMCGN26CW;
+	info->Power = BMCGN26Power;
+	info->Reset = BMCGN26Reset;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}
diff --git a/src/unif.c b/src/unif.c
index d58c1d4..567ba59 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -503,6 +503,7 @@ static BMAPPING bmap[] = {
 	{ "FARID_UNROM_8-IN-1", FARIDUNROM_Init, 0 },
 	{ "K-3033", BMCK3033_Init, 0 },
 	{ "830134C", BMC830134C_Init, 0 },
+	{ "GN-26", BMCGN26_Init, 0 },
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },
diff --git a/src/unif.h b/src/unif.h
index b35c250..661fff3 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -190,6 +190,7 @@ void BMC891227_Init(CartInfo *info);		/* m350 */
 void FARIDUNROM_Init(CartInfo *info);		/* m324 */
 void BMCK3033_Init(CartInfo *info);			/* mm22 */
 void BMC830134C_Init(CartInfo *info);		/* m315 */
+void BMCGN26_Init(CartInfo *info);			/* m344 */
 
 #ifdef COPYFAMI
 void MapperCopyFamiMMC3_Init(CartInfo *info);