74 lines
1.9 KiB
C
74 lines
1.9 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) 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 M458CW(uint32 A, uint8 V) {
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setchr1(A, ((EXPREGS[0] << 4) & ~0x7F) | (V & 0x7F));
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}
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static void M458PW(uint32 A, uint8 V) {
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if (EXPREGS[0] & 0x10) {
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setprg32(0x8000, EXPREGS[0] >> 1);
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} else {
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setprg16(0x8000, EXPREGS[0]);
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setprg16(0xC000, EXPREGS[0]);
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}
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}
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static DECLFR(M458Read) {
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if ((EXPREGS[0] & 0x20) && (EXPREGS[1] & 3)) {
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return CartBR((A & ~3) | (EXPREGS[1] & 3));
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}
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return CartBR(A);
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}
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static DECLFW(M458Write) {
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if (MMC3CanWriteToWRAM()) {
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EXPREGS[0] = A & 0xFF;
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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 M458Reset(void) {
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EXPREGS[0] = 0;
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EXPREGS[1]++;
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MMC3RegReset();
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}
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static void M458Power(void) {
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EXPREGS[0] = 0;
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EXPREGS[1] = 0;
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GenMMC3Power();
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SetReadHandler(0x8000, 0xFFFF, M458Read);
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SetWriteHandler(0x6000, 0x7FFF, M458Write);
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}
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void Mapper458_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 256, 0, 0);
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cwrap = M458CW;
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pwrap = M458PW;
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info->Reset = M458Reset;
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info->Power = M458Power;
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AddExState(EXPREGS, 2, 0, "EXPR");
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}
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