Initial commit - http://sourceforge.net/p/fceumm/code/160/

src/boards/41.c

@@ -0,0 +1,69 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2012 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
+ */
+
+#include "mapinc.h"
+
+static uint8 mainreg, chrreg, mirror;
+
+static SFORMAT StateRegs[] =
+{
+	{ &mainreg, 1, "MREG" },
+	{ &chrreg, 1, "CREG" },
+	{ &mirror, 1, "MIRR" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	setprg32(0x8000, mainreg & 7);
+	setchr8(chrreg);
+	setmirror(mirror);
+}
+
+static DECLFW(M41Write0) {
+	mainreg = A & 0xFF;
+	mirror = ((A >> 5) & 1) ^ 1;
+	chrreg = (chrreg & 3) | ((A >> 1) & 0xC);
+	Sync();
+}
+
+static DECLFW(M41Write1) {
+	if (mainreg & 0x4) {
+		chrreg = (chrreg & 0xC) | (A & 3);
+		Sync();
+	}
+}
+
+static void M41Power(void) {
+	mainreg = chrreg = 0;
+	Sync();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x6000, 0x67FF, M41Write0);
+	SetWriteHandler(0x8000, 0xFFFF, M41Write1);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper41_Init(CartInfo *info) {
+	info->Power = M41Power;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}