78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
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/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2022
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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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/* N625836 PCB */
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#include "mapinc.h"
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#include "mmc3.h"
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static void Mapper455_PRGWrap(uint32 A, uint8 V) {
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int prgAND =EXPREGS[1] &0x01? 0x1F: 0x0F;
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int prgOR =EXPREGS[0] >>2 &0x07 | EXPREGS[1] <<1 &0x08 | EXPREGS[0] >>2 &0x10;
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if (EXPREGS[0] &0x01) {
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if (EXPREGS[0] &0x02) {
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setprg32(0x8000, prgOR >>1);
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} else {
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setprg16(0x8000, prgOR);
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setprg16(0xC000, prgOR);
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}
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} else {
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prgOR <<=1;
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setprg8(A, V &prgAND | prgOR &~prgAND);
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}
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}
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static void Mapper455_CHRWrap(uint32 A, uint8 V) {
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int chrAND =EXPREGS[1] &0x02? 0xFF: 0x7F;
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int chrOR =(EXPREGS[0] >>2 &0x07 | EXPREGS[1] <<1 &0x08 | EXPREGS[0] >>2 &0x10) <<4;
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setchr1(A, V &chrAND | chrOR &~chrAND);
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}
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static DECLFW(Mapper455_Write) {
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if (A &0x100) {
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EXPREGS[0] =V;
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EXPREGS[1] =A &0xFF;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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}
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static void Mapper455_Reset(void) {
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EXPREGS[0] =1;
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EXPREGS[1] =0;
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MMC3RegReset();
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}
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static void Mapper455_Power(void) {
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EXPREGS[0] =1;
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EXPREGS[1] =0;
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GenMMC3Power();
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SetWriteHandler(0x4100, 0x5FFF, Mapper455_Write);
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}
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void Mapper455_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 256, 0, 0);
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cwrap = Mapper455_CHRWrap;
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pwrap = Mapper455_PRGWrap;
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info->Power = Mapper455_Power;
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info->Reset = Mapper455_Reset;
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AddExState(EXPREGS, 2, 0, "EXPR");
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}
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