70 lines
1.8 KiB
C
70 lines
1.8 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) 2025 NewRisingSun
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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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#include "mapinc.h"
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#include "mmc3.h"
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static void PRGWrap(uint32 A, uint8 V) {
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if (EXPREGS[1] &1) {
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if ((EXPREGS[0] &3) ==3)
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setprg32(0x8000, EXPREGS[0] <<2 &0xC | EXPREGS[0] >>2 &0x3);
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else
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setprg8(A, V &0x0F | EXPREGS[0] <<4 &0xF0);
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} else
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setprg32(0x8000, EXPREGS[0] >>4 &0x3 | 0x10);
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}
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static void CHRWrap(uint32 A, uint8 V) {
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if (EXPREGS[1] &1)
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setchr1(A, V &0x7F | EXPREGS[0] <<7 &0x180);
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else
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setchr1(A, V &0x7F | 0x200);
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}
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static DECLFW(WriteExtra) {
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if (EXPREGS[1] &1)
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EXPREGS[0] =A &0xFF;
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else
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EXPREGS[0] =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 Reset(void) {
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EXPREGS[0] =0;
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EXPREGS[1] ^=1;
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MMC3RegReset();
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}
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static void Power(void) {
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EXPREGS[0] =0;
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EXPREGS[1] =0;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, WriteExtra);
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}
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void Mapper475_Init(CartInfo *info) {
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GenMMC3_Init(info, 128, 256, 0, 0);
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cwrap = CHRWrap;
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pwrap = PRGWrap;
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info->Power = Power;
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info->Reset = Reset;
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AddExState(EXPREGS, 2, 0, "EXPR");
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}
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