66 lines
1.6 KiB
C
66 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) 2020 negativeExponent
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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 uint8 dipswitch;
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static void M334PW(uint32 A, uint8 V) {
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setprg32(0x8000, EXPREGS[0] >> 1);
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}
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static DECLFW(M334Write) {
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if (!(A & 1)) {
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EXPREGS[0] = V;
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FixMMC3PRG(MMC3_cmd);
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}
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}
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static DECLFR(M334Read) {
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if (A & 2)
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return ((X.DB & 0xFE) | (dipswitch & 1));
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return X.DB;
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}
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static void M334Reset(void) {
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dipswitch++;
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EXPREGS[0] = 0;
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MMC3RegReset();
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}
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static void M334Power(void) {
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dipswitch = 0;
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EXPREGS[0] = 0;
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GenMMC3Power();
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SetReadHandler(0x6000, 0x7FFF, M334Read);
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SetWriteHandler(0x6000, 0x7FFF, M334Write);
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}
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void Mapper334_Init(CartInfo *info) {
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GenMMC3_Init(info, 32, 32, 0, 0);
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pwrap = M334PW;
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info->Power = M334Power;
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info->Reset = M334Reset;
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AddExState(EXPREGS, 1, 0, "EXPR");
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}
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