146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2023
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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#include "asic_mmc1.h"
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#include "asic_mmc3.h"
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#include "asic_vrc2and4.h"
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static uint8 submapper;
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static uint8 reg;
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static uint8 init; /* Games switch between ASICs expecting registers to keep their value, so initialize each ASIC only on the first switch and use this bitfield to track it */
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static uint8 game;
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static SFORMAT stateRegs[] = {
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{ ®, 1, "MODE" },
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{ &init, 1, "INIT" },
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{ 0 },
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};
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static SFORMAT stateRegsMulti[] = {
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{ &game, 1, "GAME" },
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{ 0 },
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};
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static void sync (void) {
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int prgAND, chrAND, prgOR, chrOR;
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if (submapper == 3) { /* First game is 256K+256K, the others 128K+128K */
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prgAND = game? 0x0F: 0x1F;
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chrAND = game? 0x7F: 0xFF;
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prgOR = game <<4 &~prgAND;
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chrOR = game <<7 &~chrAND;
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} else {
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prgAND = 0x3F;
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chrAND = 0xFF;
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prgOR = 0x00 &~prgAND;
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chrOR = reg <<6 &0x100 &~chrAND;
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}
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if (reg &0x02) {
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prgAND >>= 1;
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prgOR >>= 1;
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chrAND >>= 2;
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chrOR >>= 2;
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MMC1_syncPRG(prgAND, prgOR);
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MMC1_syncCHR(chrAND, chrOR);
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MMC1_syncMirror();
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} else
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if (reg &0x01) {
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MMC3_syncPRG(prgAND, prgOR);
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MMC3_syncCHR(chrAND, chrOR);
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MMC3_syncMirror();
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} else {
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VRC24_syncPRG(prgAND, prgOR);
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VRC24_syncCHR(chrAND, chrOR);
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VRC24_syncMirror();
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}
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}
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int Huang2_getPRGBank (uint8 bank) {
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return MMC1_getPRGBank(bank) >>1;
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}
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static void applyMode (uint8 clear) {
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PPU_hook = NULL;
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MapIRQHook = NULL;
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GameHBIRQHook = NULL;
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if (reg &0x02) {
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MMC1_activate(clear && init &1, sync, MMC1_TYPE_MMC1B, submapper == 2? Huang2_getPRGBank: NULL, NULL, NULL, NULL);
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if (submapper != 1) MMC1_writeReg(0x8000, 0x80);
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init &= ~1;
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} else
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if (reg &0x01) {
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MMC3_activate(clear && init &2, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, NULL);
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init &= ~2;
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} else {
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VRC2_activate(clear && init &4, sync, 0x01, 0x02, NULL, NULL, NULL, NULL);
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if (init &4) { /* The earlier version of Somari needs specific VRC2 CHR register initialization */
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VRC24_writeReg(0xB000, 0xFF); VRC24_writeReg(0xB001, 0xFF); VRC24_writeReg(0xB002, 0xFF); VRC24_writeReg(0xB003, 0xFF);
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VRC24_writeReg(0xC000, 0xFF); VRC24_writeReg(0xC001, 0xFF); VRC24_writeReg(0xC002, 0xFF); VRC24_writeReg(0xC003, 0xFF);
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VRC24_writeReg(0xD000, 0xFF); VRC24_writeReg(0xD001, 0xFF); VRC24_writeReg(0xD002, 0xFF); VRC24_writeReg(0xD003, 0xFF);
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VRC24_writeReg(0xE000, 0xFF); VRC24_writeReg(0xE001, 0xFF); VRC24_writeReg(0xE002, 0xFF); VRC24_writeReg(0xE003, 0xFF);
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init &= ~4;
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}
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}
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}
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static DECLFW (writeReg) {
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if (A &0x100) {
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uint8 previousReg = reg;
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reg = V;
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if ((previousReg ^V) &3)
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applyMode(1);
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else
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sync();
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}
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}
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static void reset (void) {
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reg = 1;
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init = 7;
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if (++game == 1) ++game; /* First game is twice as large */
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if (game >= ROM_size /8) game = 0;
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applyMode(1);
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}
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static void power (void) {
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reg = 1;
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init = 7;
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game = 0;
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x4020, 0x5FFF, writeReg);
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applyMode(1);
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}
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static void restore (int version) {
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applyMode(0);
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}
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void UNLSL12_Init (CartInfo *info) {
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submapper = info->submapper;
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MMC1_addExState();
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MMC3_addExState();
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VRC24_addExState();
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info->Reset = reset;
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info->Power = power;
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GameStateRestore = restore;
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AddExState(stateRegs, ~0, 0, 0);
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if (submapper == 3) AddExState(stateRegsMulti, ~0, 0, 0);
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}
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