86 lines
2.0 KiB
C
86 lines
2.0 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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#include "cartram.h"
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static uint8 submapper;
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static uint8 reg;
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static uint8 pad;
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static DECLFR (readPad) {
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return CartBR(A &~3 | pad &3);
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}
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static void sync () {
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MMC3_syncPRG(0x0F, reg <<4 &~0x0F);
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if (reg &0x04)
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MMC3_syncCHR(0x1FF, 0x000);
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else
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setchr8r(0x10, 0);
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MMC3_syncMirror();
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SetReadHandler(0x8000, 0xFFFF, submapper == 0 && reg &0x80 || submapper == 1 && reg &0x20? readPad: CartBR);
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}
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static int getPRGBank (uint8 bank) {
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if (reg &0x08) {
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int mask = reg &0x10? 3: 1;
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return MMC3_getPRGBank(bank &1) &~mask | bank &mask;
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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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pad++;
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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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pad = 0;
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MMC3_power();
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}
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void Mapper460_Init (CartInfo *info) {
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submapper = info->submapper;
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MMC3_init(info, sync, MMC3_TYPE_SHARP, getPRGBank, getCHRBank, NULL, writeReg);
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CHRRAM_init(info, 8);
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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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AddExState(®, 1, 0, "DIPS");
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}
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