83 lines
2.3 KiB
C
83 lines
2.3 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) 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 "mmc3.h"
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static void M412PW(uint32 A, uint8 V) {
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int prgAND =0x0F | (EXPREGS[1] &0x02? 0x00: 0x20) | (EXPREGS[1] &0x10? 0x00: 0x10);
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int prgOR =(EXPREGS[1] &0x40? 0x10: 0x00) | (EXPREGS[1] &0x04? 0x20: 0x00);
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if (EXPREGS[2] &0x02) { /* NROM mode */
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if (EXPREGS[2] &0x04) /* NROM-256 */
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setprg32(0x8000, EXPREGS[2] >>4);
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else {
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setprg16(0x8000, EXPREGS[2] >>3);
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setprg16(0xC000, EXPREGS[2] >>3);
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}
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} else
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setprg8(A, V &prgAND | prgOR &~prgAND);
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}
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static void M412CW(uint32 A, uint8 V) {
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int chrAND =EXPREGS[1] &0x20? 0x7F: 0xFF;
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int chrOR =(EXPREGS[1] &0x80? 0x80: 0x00) | (EXPREGS[1] &0x08? 0x100: 0x000);
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if (EXPREGS[2] &0x02) /* (C)NROM mode */
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setchr8(EXPREGS[0] >>2);
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else
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setchr1(A, (V & chrAND) | (chrOR & ~chrAND));
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}
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static DECLFR(M412Read) {
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return EXPREGS[4];
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}
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static DECLFW(M412Write) {
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if (~EXPREGS[1] &0x01) {
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EXPREGS[A & 3] = V;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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CartBW(A, V);
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}
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static void M412Reset(void) {
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EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =0;
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EXPREGS[4]++;
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MMC3RegReset();
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}
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static void M412Power(void) {
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EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =0;
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GenMMC3Power();
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SetReadHandler(0x5000, 0x5FFF, M412Read);
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SetWriteHandler(0x6000, 0x7FFF, M412Write);
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}
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void Mapper412_Init(CartInfo *info) {
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GenMMC3_Init(info, 512, 256, 0, 0);
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cwrap = M412CW;
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pwrap = M412PW;
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info->Power = M412Power;
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info->Reset = M412Reset;
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AddExState(EXPREGS, 5, 0, "EXPR");
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}
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