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

src/boards/228.c

@@ -0,0 +1,84 @@
+/* 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 mram[4], vreg;
+static uint16 areg;
+
+static SFORMAT StateRegs[] =
+{
+	{ mram, 4, "MRAM" },
+	{ &areg, 2, "AREG" },
+	{ &vreg, 1, "VREG" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	uint32 prgl, prgh, page = (areg >> 7) & 0x3F;
+	if ((page & 0x30) == 0x30)
+		page -= 0x10;
+	prgl = prgh = (page << 1) + (((areg >> 6) & 1) & ((areg >> 5) & 1));
+	prgh += ((areg >> 5) & 1) ^ 1;
+
+	setmirror(((areg >> 13) & 1) ^ 1);
+	setprg16(0x8000, prgl);
+	setprg16(0xc000, prgh);
+	setchr8(((vreg & 0x3) | ((areg & 0xF) << 2)));
+}
+
+static DECLFW(M228RamWrite) {
+	mram[A & 3] = V & 0x0F;
+}
+
+static DECLFR(M228RamRead) {
+	return mram[A & 3];
+}
+
+static DECLFW(M228Write) {
+	areg = A;
+	vreg = V;
+	Sync();
+}
+
+static void M228Reset(void) {
+	areg = 0x8000;
+	vreg = 0;
+	Sync();
+}
+
+static void M228Power(void) {
+	M228Reset();
+	SetReadHandler(0x5000, 0x5FFF, M228RamRead);
+	SetWriteHandler(0x5000, 0x5FFF, M228RamWrite);
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0xFFFF, M228Write);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper228_Init(CartInfo *info) {
+	info->Reset = M228Reset;
+	info->Power = M228Power;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}