61 lines
1.7 KiB
C
61 lines
1.7 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) 2023
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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 M457CW(uint32 A, uint8 V) {
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uint32 mask = (EXPREGS[0] & 8) ? 0xFF : 0x7F;
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setchr1(A, ((EXPREGS[0] << 7) & ~mask) | (V & mask));
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}
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static void M457PW(uint32 A, uint8 V) {
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uint32 mask = (EXPREGS[0] & 8) ? 0x1F : 0x0F;
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setprg8(A, (((EXPREGS[0] & 7) << 4) & ~mask) | (V & mask));
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}
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static DECLFW(M457Write) {
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if (MMC3CanWriteToWRAM()) {
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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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}
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static void M457Reset(void) {
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EXPREGS[0] = 0;
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MMC3RegReset();
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}
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static void M457Power(void) {
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EXPREGS[0] = 0;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, M457Write);
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}
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void Mapper457_Init(CartInfo *info) {
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GenMMC3_Init(info, 128, 256, 0, 0);
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cwrap = M457CW;
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pwrap = M457PW;
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info->Reset = M457Reset;
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info->Power = M457Power;
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AddExState(EXPREGS, 1, 0, "EXPR");
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}
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