75 lines
2.1 KiB
C
75 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 negativeExponent
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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 "mmc3.h"
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static void M432CW(uint32 A, uint8 V) {
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int chrAND = EXPREGS[1] &0x04? 0x7F: 0xFF;
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int chrOR = EXPREGS[1] <<7 &0x080 | EXPREGS[1] <<5 &0x100;
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setchr1(A, V &chrAND | chrOR &~chrAND);
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}
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static void M432PW(uint32 A, uint8 V) {
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int prgAND = EXPREGS[1] &0x02? 0x0F: 0x1F;
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int prgOR = EXPREGS[1] <<4 &0x10 | EXPREGS[1] <<1 &0x20;
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if (A <0xC000 || ~EXPREGS[1] &0x40) setprg8(A, V &prgAND | prgOR &~prgAND);
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if (A <0xC000 && EXPREGS[1] &0x40) setprg8(A |0x4000, V &prgAND | prgOR &~prgAND);
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}
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static DECLFR(M432Read) {
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if (EXPREGS[0] &1)
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return EXPREGS[2];
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return CartBR(A);
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}
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static DECLFW(M432Write) {
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EXPREGS[A &1] = V;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static void M432Reset(void) {
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EXPREGS[0] = 0;
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EXPREGS[1] = 0;
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EXPREGS[2] = (EXPREGS[2] +1) &3;
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MMC3RegReset();
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}
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static void M432Power(void) {
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EXPREGS[0] = 0;
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EXPREGS[1] = 0;
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EXPREGS[2] = 0;
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GenMMC3Power();
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SetReadHandler(0x8000, 0xFFFF, M432Read);
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SetWriteHandler(0x6000, 0x7FFF, M432Write);
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}
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void Mapper432_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 256, 0, 0);
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cwrap = M432CW;
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pwrap = M432PW;
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info->Power = M432Power;
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info->Reset = M432Reset;
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AddExState(EXPREGS, 3, 0, "EXPR");
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}
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