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

src/boards/234.c

@@ -0,0 +1,79 @@
+/* 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 bank, preg;
+static SFORMAT StateRegs[] =
+{
+	{ &bank, 1, "BANK" },
+	{ &preg, 1, "PREG" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	if (bank & 0x40) {
+		setprg32(0x8000, (bank & 0xE) | (preg & 1));
+		setchr8(((bank & 0xE) << 2) | ((preg >> 4) & 7));
+	} else {
+		setprg32(0x8000, bank & 0xF);
+		setchr8(((bank & 0xF) << 2) | ((preg >> 4) & 3));
+	}
+	setmirror((bank >> 7) ^ 1);
+}
+
+DECLFR(M234ReadBank) {
+	uint8 r = CartBR(A);
+	if (!bank) {
+		bank = r;
+		Sync();
+	}
+	return r;
+}
+
+DECLFR(M234ReadPreg) {
+	uint8 r = CartBR(A);
+	preg = r;
+	Sync();
+	return r;
+}
+
+static void M234Reset(void) {
+	bank = preg = 0;
+	Sync();
+}
+
+static void M234Power(void) {
+	M234Reset();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetReadHandler(0xFF80, 0xFF9F, M234ReadBank);
+	SetReadHandler(0xFFE8, 0xFFF7, M234ReadPreg);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper234_Init(CartInfo *info) {
+	info->Power = M234Power;
+	info->Reset = M234Reset;
+	AddExState(&StateRegs, ~0, 0, 0);
+	GameStateRestore = StateRestore;
+}