76 lines
2.1 KiB
C
76 lines
2.1 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[4];
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static void sync () {
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int prgAND = reg[1] &0x20? 0x1F: 0x0F;
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int chrAND = reg[1] &0x40? 0xFF: 0x7F;
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int prgOR = (reg[1] &0x02? 0x10: 0x00) | (reg[1] &0x10? 0x020: 0x00);
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int chrOR = (reg[1] &0x02? 0x80: 0x00) | (reg[1] &0x10? 0x100: 0x00);
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if (reg[0] &0x80) {
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if (reg[0] &0x20)
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setprg32(0x8000, reg[0] >>1);
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else {
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setprg16(0x8000, reg[0]);
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setprg16(0xC000, reg[0]);
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}
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} else
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MMC3_syncPRG(prgAND, prgOR &~prgAND);
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MMC3_syncCHR(chrAND, chrOR &~chrAND);
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MMC3_syncMirror();
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}
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static DECLFW (writeReg) {
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if (~reg[1] &0x01) {
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reg[A &3] = V;
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sync();
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}
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}
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static DECLFW (unscramble) {
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static const uint16 lutAddress[8] = { 0xA001, 0xA000, 0x8000, 0xC000, 0x8001, 0xC001, 0xE000, 0xE001 }; /* i <5? 4-i: i */
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static const uint8 lutIndex[8] = { 0, 3, 1, 5, 6, 7, 2, 4 }; /* i <6? (i^3)-1: i */
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MMC3_writeReg(lutAddress[A >>12 &6 | A &1], (A &0xE001) == 0xA000? lutIndex[V &7]: V);
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}
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static void reset () {
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reg[0] = reg[1] = reg[2] = reg[3] = 0;
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MMC3_clear();
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}
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static void power () {
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reg[0] = reg[1] = reg[2] = reg[3] = 0;
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MMC3_power();
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SetWriteHandler(0x8000, 0xFFFF, unscramble);
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}
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void Mapper182_Init (CartInfo *info) {
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MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, writeReg);
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info->Power = power;
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info->Reset = reset;
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AddExState(reg, 4, 0, "EXPR");
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}
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