71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2019 Libretro Team
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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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/* NES 2.0 Mapper 324
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* FARID_UNROM_8-IN-1
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* https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_324
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*/
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#include "mapinc.h"
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static uint8 latch;
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static SFORMAT StateRegs[] =
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{
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{ &latch, 1, "LATC" },
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{ 0 }
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};
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static void Sync(void) {
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setchr8(0);
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setprg16(0x8000, ((latch & 0x70) >> 1) | (latch & 0x07));
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setprg16(0xC000, ((latch & 0x70) >> 1) | 0x07 );
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}
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static DECLFW(FARIDUNROMWrite) {
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V &= CartBR(A);
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if ((V & 0x80) && !(latch & 0x80) && !(latch & 0x08))
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latch = (latch & 0x87) | (V & 0x78);
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latch = (latch & 0x78) | (V & 0x87);
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Sync();
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}
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static void FARIDUNROMPower(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, FARIDUNROMWrite);
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}
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static void FARIDUNROMReset(void) {
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latch &= ~0x78;
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Sync();
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}
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static void StateRestore(int version) {
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Sync();
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}
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void FARIDUNROM_Init(CartInfo *info) {
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info->Power = FARIDUNROMPower;
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info->Reset = FARIDUNROMReset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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