60 lines
1.6 KiB
C
60 lines
1.6 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) 2022 negativeExponent
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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 M291CW(uint32 A, uint8 V) {
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setchr1(A, V | ((EXPREGS[0] << 2) & 0x100));
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}
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static void M291PW(uint32 A, uint8 V) {
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if (EXPREGS[0] & 0x20)
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setprg32(0x8000, ((EXPREGS[0] >> 1) & 3) | ((EXPREGS[0] >> 4) & 4));
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else
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setprg8(A, (V & 0x0F) | ((EXPREGS[0] >> 2) & 0x10));
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}
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static DECLFW(M291Write) {
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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 M291Reset(void) {
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EXPREGS[0] = 0;
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MMC3RegReset();
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}
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static void M291Power(void) {
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EXPREGS[0] = 0;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, M291Write);
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}
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void Mapper291_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 512, 0, 0);
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cwrap = M291CW;
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pwrap = M291PW;
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info->Power = M291Power;
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info->Reset = M291Reset;
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AddExState(EXPREGS, 1, 0, "EXPR");
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}
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