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

src/boards/8157.c

@@ -0,0 +1,85 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2005 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
+ *
+ * GG1 boards, similar to T-262, with no Data latch
+ *
+ */
+
+#include "mapinc.h"
+
+static uint16 cmdreg;
+static uint8 reset;
+static SFORMAT StateRegs[] =
+{
+	{ &reset, 1, "REST" },
+	{ &cmdreg, 2, "CREG" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	uint32 base = ((cmdreg & 0x060) | ((cmdreg & 0x100) >> 1)) >> 2;
+	uint32 bank = (cmdreg & 0x01C) >> 2;
+	uint32 lbank = (cmdreg & 0x200) ? 7 : ((cmdreg & 0x80) ? bank : 0);
+	if (PRGptr[1]) {
+		setprg16r(base >> 3, 0x8000, bank);        // for versions with split ROMs
+		setprg16r(base >> 3, 0xC000, lbank);
+	} else {
+		setprg16(0x8000, base | bank);
+		setprg16(0xC000, base | lbank);
+	}
+	setmirror(((cmdreg & 2) >> 1) ^ 1);
+}
+
+static DECLFR(UNL8157Read) {
+	if ((cmdreg & 0x100) && (PRGsize[0] < (1024 * 1024))) {
+		A = (A & 0xFFF0) + reset;
+	}
+	return CartBR(A);
+}
+
+static DECLFW(UNL8157Write) {
+	cmdreg = A;
+	Sync();
+}
+
+static void UNL8157Power(void) {
+	setchr8(0);
+	SetWriteHandler(0x8000, 0xFFFF, UNL8157Write);
+	SetReadHandler(0x8000, 0xFFFF, UNL8157Read);
+	cmdreg = reset = 0;
+	Sync();
+}
+
+static void UNL8157Reset(void) {
+	cmdreg = reset = 0;
+	reset++;
+	reset &= 0x1F;
+	Sync();
+}
+
+static void UNL8157Restore(int version) {
+	Sync();
+}
+
+void UNL8157_Init(CartInfo *info) {
+	info->Power = UNL8157Power;
+	info->Reset = UNL8157Reset;
+	GameStateRestore = UNL8157Restore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}