Backport r173 - UNIF-DRAGONFIGHTER - new board for a new dump

src/boards/BMW8544.c

@@ -0,0 +1,79 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2015 CaH4e3
+ *
+ * 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
+ *
+ * "Dragon Fighter" protected MMC3 based custom mapper board
+ * mostly hacky implementation, I can't verify if this mapper can read a RAM of the
+ * console or watches the bus writes somehow.
+ *
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void UNLBMW8544PW(uint32 A, uint8 V) {
+	if(A == 0x8000)
+		setprg8(A,EXPREGS[0] & 0x1F);	// the real hardware has this bank overrided with it's own register,
+	else								// but MMC3 prg swap still works and you can actually change bank C000 at the same time if use 0x46 cmd
+		setprg8(A,V);
+}
+
+static void UNLBMW8544CW(uint32 A, uint8 V) {
+	if(A == 0x0000)
+		setchr2(0x0000,(V >> 1) ^ EXPREGS[1]);
+	else if (A == 0x0800)
+		setchr2(0x0800,(V >> 1) | ((EXPREGS[2] & 0x40) << 1));
+	else if (A == 0x1000)
+		setchr4(0x1000, EXPREGS[2] & 0x3F);
+
+}
+
+static DECLFW(UNLBMW8544ProtWrite) {
+	if(!(A & 1)) {
+		EXPREGS[0] = V;
+		FixMMC3PRG(MMC3_cmd);
+	}
+}
+
+static DECLFR(UNLBMW8544ProtRead) {
+	if(!fceuindbg) {
+		if(!(A & 1)) {
+			if((EXPREGS[0] & 0xE0) == 0xC0) {
+				EXPREGS[1] = ARead[0x6a](0x6a);	// program can latch some data from the BUS, but I can't say how exactly,
+			} else {							// without more euipment and skills ;) probably here we can try to get any write
+				EXPREGS[2] = ARead[0xff](0xff);	// before the read operation
+			}
+			FixMMC3CHR(MMC3_cmd & 0x7F);		// there are more different behaviour of the board isn't used by game itself, so unimplemented here and
+		}										// actually will break the current logic ;)
+	}
+	return 0;
+}
+
+static void UNLBMW8544Power(void) {
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x6FFF, UNLBMW8544ProtWrite);
+	SetReadHandler(0x6000, 0x6FFF, UNLBMW8544ProtRead);
+}
+
+void UNLBMW8544_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 256, 0, 0);
+	pwrap = UNLBMW8544PW;
+	cwrap = UNLBMW8544CW;
+	info->Power = UNLBMW8544Power;
+	AddExState(EXPREGS, 3, 0, "EXPR");
+}

src/drivers/libretro/fceu/unif.c

@@ -451,6 +451,7 @@ static BMAPPING bmap[] = {
 	{ "YOKO", UNLYOKO_Init, 0 },
         { "COOLBOY", COOLBOY_Init, BMCFLAG_256KCHRR },
         { "158B", UNL158B_Init, 0 },
+        { "DRAGONFIGHTER", UNLBMW8544_Init, 0},
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },

src/unif.c

@@ -451,6 +451,7 @@ static BMAPPING bmap[] = {
 	{ "YOKO", UNLYOKO_Init, 0 },
         { "COOLBOY", COOLBOY_Init, BMCFLAG_256KCHRR },
         { "158B", UNL158B_Init, 0 },
+        { "DRAGONFIGHTER", UNLBMW8544_Init, 0},
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },

src/unif.h

@@ -147,6 +147,7 @@ void UNLYOKO_Init(CartInfo *info);
 void UNROM_Init(CartInfo *info);
 void COOLBOY_Init(CartInfo *info);
 void UNL158B_Init(CartInfo *info);
+void UNLBMW8544_Init(CartInfo *info);
 
 #ifdef COPYFAMI
 void MapperCopyFamiMMC3_Init(CartInfo *info);