fceux/src/boards/8237.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2011 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
 *
 * Super Game (Sugar Softec) protected mapper
 * Pocahontas 2 (Unl) [U][!], etc.
 * TODO: 9in1 LION KING HANGS!
 */

#include "mapinc.h"
#include "mmc3.h"

static uint8 cmdin;

static uint8 regperm[8][8] =
{
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0, 2, 6, 1, 7, 3, 4, 5 },
	{ 0, 5, 4, 1, 7, 2, 6, 3 },   // unused
	{ 0, 6, 3, 7, 5, 2, 4, 1 },
	{ 0, 2, 5, 3, 6, 1, 7, 4 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // empty
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // empty
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // empty
};

static uint8 adrperm[8][8] =
{
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 3, 2, 0, 4, 1, 5, 6, 7 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // unused
	{ 5, 0, 1, 2, 3, 7, 6, 4 },
	{ 3, 1, 0, 5, 2, 4, 6, 7 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // empty
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // empty
	{ 0, 1, 2, 3, 4, 5, 6, 7 },   // empty
};

static void UNL8237CW(uint32 A, uint8 V) {
	if (EXPREGS[0] & 0x40)
		setchr1(A, ((EXPREGS[1] & 0xc) << 6) | (V & 0x7F) | ((EXPREGS[1] & 0x20) << 2));
	else
		setchr1(A, ((EXPREGS[1] & 0xc) << 6) | V);
}

static void UNL8237PW(uint32 A, uint8 V) {
	if (EXPREGS[0] & 0x40) {
		uint8 sbank = (EXPREGS[1] & 0x10);
		if (EXPREGS[0] & 0x80) {
			uint8 bank = ((EXPREGS[1] & 3) << 4) | (EXPREGS[0] & 0x7) | (sbank >> 1);
			if (EXPREGS[0] & 0x20)
				setprg32(0x8000, bank >> 1);
			else{
				setprg16(0x8000, bank);
				setprg16(0xC000, bank);
			}
		} else
			setprg8(A, ((EXPREGS[1] & 3) << 5) | (V & 0x0F) | sbank);
	} else {
		if (EXPREGS[0] & 0x80) {
			uint8 bank = ((EXPREGS[1] & 3) << 4) | (EXPREGS[0] & 0xF);
			if (EXPREGS[0] & 0x20)
				setprg32(0x8000, bank >> 1);
			else{
				setprg16(0x8000, bank);
				setprg16(0xC000, bank);
			}
		} else
			setprg8(A, ((EXPREGS[1] & 3) << 5) | (V & 0x1F));
	}
}

static void UNL8237ACW(uint32 A, uint8 V) {
	if (EXPREGS[0] & 0x40)
		setchr1(A, ((EXPREGS[1] & 0xE) << 7) | (V & 0x7F) | ((EXPREGS[1] & 0x20) << 2));
	else
		setchr1(A, ((EXPREGS[1] & 0xE) << 7) | V);
}

static void UNL8237APW(uint32 A, uint8 V) {
	if (EXPREGS[0] & 0x40) {
		uint8 sbank = (EXPREGS[1] & 0x10);
		if (EXPREGS[0] & 0x80) {
			uint8 bank = ((EXPREGS[1] & 3) << 4) | ((EXPREGS[1] & 8) << 3) | (EXPREGS[0] & 0x7) | (sbank >> 1);
			if (EXPREGS[0] & 0x20) {
//				FCEU_printf("8000:%02X\n",bank>>1);
				setprg32(0x8000, bank >> 1);
			} else {
//				FCEU_printf("8000-C000:%02X\n",bank);
				setprg16(0x8000, bank);
				setprg16(0xC000, bank);
			}
		} else {
//			FCEU_printf("%04x:%02X\n",A,((EXPREGS[1]&3)<<5)|((EXPREGS[1]&8)<<4)|(V&0x0F)|sbank);
			setprg8(A, ((EXPREGS[1] & 3) << 5) | ((EXPREGS[1] & 8) << 4) | (V & 0x0F) | sbank);
		}
	} else {
		if (EXPREGS[0] & 0x80) {
			uint8 bank = ((EXPREGS[1] & 3) << 4) | ((EXPREGS[1] & 8) << 3) | (EXPREGS[0] & 0xF);
			if (EXPREGS[0] & 0x20) {
//				FCEU_printf("8000:%02X\n",(bank>>1)&0x07);
				setprg32(0x8000, bank >> 1);
			} else {
//				FCEU_printf("8000-C000:%02X\n",bank&0x0F);
				setprg16(0x8000, bank);
				setprg16(0xC000, bank);
			}
		} else {
//			FCEU_printf("%04X:%02X\n",A,(((EXPREGS[1]&3)<<5)|((EXPREGS[1]&8)<<4)|(V&0x1F))&0x1F);
			setprg8(A, ((EXPREGS[1] & 3) << 5) | ((EXPREGS[1] & 8) << 4) | (V & 0x1F));
		}
	}
}
static DECLFW(UNL8237Write) {
	uint8 dat = V;
	uint8 adr = adrperm[EXPREGS[2]][((A >> 12) & 6) | (A & 1)];
	uint16 addr = (adr & 1) | ((adr & 6) << 12) | 0x8000;
	if (adr < 4) {
		if (!adr)
			dat = (dat & 0xC0) | (regperm[EXPREGS[2]][dat & 7]);
		MMC3_CMDWrite(addr, dat);
	} else
		MMC3_IRQWrite(addr, dat);
}

static DECLFW(UNL8237ExWrite) {
	switch (A) {
	case 0x5000: EXPREGS[0] = V; FixMMC3PRG(MMC3_cmd); break;
	case 0x5001: EXPREGS[1] = V; FixMMC3PRG(MMC3_cmd); FixMMC3CHR(MMC3_cmd); break;
	case 0x5007: EXPREGS[2] = V; break;
	}
}

static void UNL8237Power(void) {
	EXPREGS[0] = EXPREGS[2] = 0;
	EXPREGS[1] = 3;
	GenMMC3Power();
	SetWriteHandler(0x8000, 0xFFFF, UNL8237Write);
	SetWriteHandler(0x5000, 0x7FFF, UNL8237ExWrite);
}

void UNL8237_Init(CartInfo *info) {
	GenMMC3_Init(info, 256, 256, 0, 0);
	cwrap = UNL8237CW;
	pwrap = UNL8237PW;
	info->Power = UNL8237Power;
	AddExState(EXPREGS, 3, 0, "EXPR");
	AddExState(&cmdin, 1, 0, "CMDI");
}

void UNL8237A_Init(CartInfo *info) {
	GenMMC3_Init(info, 256, 256, 0, 0);
	cwrap = UNL8237ACW;
	pwrap = UNL8237APW;
	info->Power = UNL8237Power;
	AddExState(EXPREGS, 3, 0, "EXPR");
	AddExState(&cmdin, 1, 0, "CMDI");
}