92 lines
2.3 KiB
C
92 lines
2.3 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) 2025 NewRisingSun
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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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static uint16 latchAddr;
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static uint8 latchData;
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static uint8 mode;
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static uint8 submapper;
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static SFORMAT StateRegs[] = {
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{ &latchAddr, 2 | FCEUSTATE_RLSB, "LATC" },
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{ &latchData, 1, "DATA" },
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{ &mode, 1, "MODE" },
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{ 0 }
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};
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static void Sync(void) {
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if (mode &1) {
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if (submapper == 1) {
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setprg16(0x8000, latchAddr >>2 &7 |0x20);
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setprg16(0xC000, 0x27);
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} else {
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setprg16(0x8000, 0x20 | latchData &0x07);
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setprg16(0xC000, 0x27);
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}
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setmirror(MI_V);
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} else {
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if (latchAddr &0x01)
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setprg32(0x8000, latchAddr >>3 &0x0F);
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else {
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setprg16(0x8000, latchAddr >>2 &0x1F);
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setprg16(0xC000, latchAddr >>2 &0x1F);
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}
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if (~latchAddr &0x80) setprg16(0xC000, 0);
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setmirror(latchAddr &0x02? MI_H: MI_V);
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}
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SetupCartCHRMapping(0, CHRptr[0], 0x2000, ~mode &0x01 && latchAddr &0x80? 0: 1);
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setchr8(0);
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}
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static DECLFW(M280Write) {
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latchAddr =A;
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latchData =V;
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Sync();
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}
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static void M280Reset(void) {
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mode ^=1;
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latchAddr = 0;
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latchData = 0;
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Sync();
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}
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static void M280Power(void) {
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mode =0;
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latchAddr = 0;
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latchData = 0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M280Write);
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}
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static void StateRestore(int version) {
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Sync();
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}
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void Mapper280_Init(CartInfo *info) {
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submapper = info->submapper;
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info->Power = M280Power;
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info->Reset = M280Reset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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