fceux/src/boards/sc-127.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2009 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
 *
 * Wario Land II (Kirby hack)
 */

#include "mapinc.h"

static uint8 reg[8], chr[8];
static uint8 *WRAM = NULL;
static uint32 WRAMSIZE;
static uint16 IRQCount, IRQa;

static SFORMAT StateRegs[] =
{
	{ reg, 8, "REGS" },
	{ chr, 8, "CHRS" },
	{ &IRQCount, 2, "IRQc" },
	{ &IRQa, 2, "IRQa" },
	{ 0 }
};

static void Sync(void) {
	int i;
	setprg8r(0x10, 0x6000, 0);
	setprg8(0x8000, reg[0]);
	setprg8(0xA000, reg[1]);
	setprg8(0xC000, reg[2]);
	setprg8(0xE000, ~0);
	for (i = 0; i < 8; i++)
		setchr1(i << 10, chr[i]);
	setmirror(reg[3] ^ 1);
}

static DECLFW(UNLSC127Write) {
	switch (A) {
	case 0x8000: reg[0] = V; break;
	case 0x8001: reg[1] = V; break;
	case 0x8002: reg[2] = V; break;
	case 0x9000: chr[0] = V; break;
	case 0x9001: chr[1] = V; break;
	case 0x9002: chr[2] = V; break;
	case 0x9003: chr[3] = V; break;
	case 0x9004: chr[4] = V; break;
	case 0x9005: chr[5] = V; break;
	case 0x9006: chr[6] = V; break;
	case 0x9007: chr[7] = V; break;
	case 0xC002: IRQa = 0; X6502_IRQEnd(FCEU_IQEXT); break;
	case 0xC005: IRQCount = V; break;
	case 0xC003: IRQa = 1; break;
	case 0xD001: reg[3] = V; break;
	}
	Sync();
}

static DECLFR(UNLSC127ProtRead) {
	return 0x20;
}

static void UNLSC127Power(void) {
	IRQCount = IRQa = 0;
	Sync();
	SetReadHandler(0x5800, 0x5800, UNLSC127ProtRead);
	SetReadHandler(0x6000, 0x7fff, CartBR);
	SetWriteHandler(0x6000, 0x7fff, CartBW);
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x8000, 0xFFFF, UNLSC127Write);
	FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
}

static void UNLSC127IRQ(void) {
	if (IRQa) {
		if(IRQCount > 0)
			IRQCount--;
		if (!IRQCount) {
			X6502_IRQBegin(FCEU_IQEXT);
			IRQa = 0;
		}
	}
}

static void UNLSC127Reset(void) {
	IRQCount = IRQa = 0;
}

static void UNLSC127Close(void) {
	if (WRAM)
		FCEU_gfree(WRAM);
	WRAM = NULL;
}

static void StateRestore(int version) {
	Sync();
}

void UNLSC127_Init(CartInfo *info) {
	info->Reset = UNLSC127Reset;
	info->Power = UNLSC127Power;
	info->Close = UNLSC127Close;
	GameHBIRQHook = UNLSC127IRQ;
	GameStateRestore = StateRestore;
	WRAMSIZE = 8192;
	WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
	SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
	AddExState(WRAM, WRAMSIZE, 0, "WRAM");
	AddExState(&StateRegs, ~0, 0, 0);
}