118 lines
2.9 KiB
C
118 lines
2.9 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) 2025 NewRisingSun
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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_mmc2and4.h"
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static void (*MMC24_cbSync)();
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static uint8 MMC24_reg[6];
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static uint8 MMC24_latch[2];
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static SFORMAT MMC24_state[] = {
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{ MMC24_reg, 6, "MC2R" },
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{ MMC24_latch, 2, "MC2S" },
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{ 0 }
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};
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static void (*MMC24_cbSync)();
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void MMC24_syncWRAM (int OR) {
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if (PRGsize[0x10]) setprg8r(0x10, 0x6000, OR);
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}
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void MMC2_syncPRG (int AND, int OR) {
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setprg8(0x8000, MMC24_reg[0] &AND |OR);
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setprg8(0xA000, 0xFD &AND |OR);
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setprg8(0xC000, 0xFE &AND |OR);
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setprg8(0xE000, 0xFF &AND |OR);
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}
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void MMC4_syncPRG (int AND, int OR) {
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setprg16(0x8000, MMC24_reg[0] &AND |OR);
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setprg16(0xC000, 0xFF &AND |OR);
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}
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void MMC24_syncCHR (int AND, int OR) {
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setchr4(0x0000, MMC24_reg[1 +MMC24_latch[0]] &AND |OR);
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setchr4(0x1000, MMC24_reg[3 +MMC24_latch[1]] &AND |OR);
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}
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void MMC24_syncMirror () {
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setmirror(MMC24_reg[5] &1? MI_H: MI_V);
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}
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static void FP_FASTAPASS(1) MMC24_trapPPUAddressChange (uint32 A) {
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if ((A &0x2FF0) == 0xFD0 || (A &0x2FF0) == 0xFE0) {
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MMC24_latch[A >>12 &1] = A >>5 &1;
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MMC24_cbSync();
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}
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}
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DECLFW(MMC24_write) {
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MMC24_reg[(A >>12) -0xA] = V;
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MMC24_cbSync();
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}
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static void MMC24_clear () {
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MMC24_reg[0] = 0; MMC24_reg[1] = 0; MMC24_reg[2] = 2; MMC24_reg[3] = 0; MMC24_reg[4] = 0; MMC24_reg[5] = 0;
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MMC24_latch[0] = 0; MMC24_latch[1] = 0;
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MMC24_cbSync();
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}
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static void MMC24_setHandlers() {
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SetReadHandler (0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0xA000, 0xFFFF, MMC24_write);
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PPU_hook = MMC24_trapPPUAddressChange;
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}
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static void MMC24_configure (void (*sync)()) {
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MMC24_cbSync = sync;
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}
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void MMC24_activate (uint8 clear, void (*sync)()) {
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MMC24_configure(sync);
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MMC24_setHandlers();
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if (clear)
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MMC24_clear();
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else
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MMC24_cbSync();
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}
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void MMC24_addExState () {
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AddExState(MMC24_state, ~0, 0, 0);
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}
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void MMC24_restore (int version) {
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MMC24_cbSync();
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}
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void MMC24_power () {
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MMC24_setHandlers();
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MMC24_clear();
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}
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void MMC24_init (CartInfo *info, void (*sync)()) {
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MMC24_addExState();
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MMC24_configure(sync);
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info->Power = MMC24_power;
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info->Reset = MMC24_cbSync;
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GameStateRestore = MMC24_restore;
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}
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