71 lines
1.7 KiB
C
71 lines
1.7 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) 2020
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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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*
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*/
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#include "mapinc.h"
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#include "asic_mmc3.h"
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static uint8 reg;
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static void sync() {
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int chrAND = reg &0x04? 0x1FF: reg &0x02? 0xFF: 0x7F;
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int chrOR = reg <<7;
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MMC3_syncPRG(0x0F, reg <<4 &~0x0F);
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MMC3_syncCHR(chrAND, chrOR &~chrAND);
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MMC3_syncMirror();
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}
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static int getPRGBank(uint8 bank) {
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if (reg &0x08) {
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return MMC3_getPRGBank(0) &~3 | bank &3;
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} else
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return MMC3_getPRGBank(bank);
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}
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static int getCHRBank(uint8 bank) {
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if (reg &0x04)
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return MMC3_getCHRBank(bank &6 | bank >>1 &1) <<1 | bank &1;
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else
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return MMC3_getCHRBank(bank);
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}
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static DECLFW(writeReg) {
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reg = A &0xFF;
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sync();
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}
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static void reset() {
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reg = 0;
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MMC3_clear();
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}
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static void power() {
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reg = 0;
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MMC3_power();
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}
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void Mapper569_Init(CartInfo *info) {
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MMC3_init(info, sync, MMC3_TYPE_SHARP, getPRGBank, getCHRBank, NULL, writeReg);
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info->Power = power;
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info->Reset = reset;
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AddExState(®, 1, 0, "EXPR");
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}
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