93 lines
2.4 KiB
C
93 lines
2.4 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
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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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static uint16 latchAddr;
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static uint8 latchData;
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static uint8 submapper;
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static SFORMAT StateRegs[] =
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{
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{ &latchAddr, 2, "ADDR" },
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{ &latchData, 1, "DATA" },
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{ 0 }
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};
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static void Mapper354_Sync(void)
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{
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int prg =latchData &0x3F | latchAddr <<2 &0x40 | latchAddr >>5 &0x80;
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switch(latchAddr &7)
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{
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case 0: case 4:
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setprg32(0x8000, prg >>1);
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break;
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case 1:
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setprg16(0x8000, prg);
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setprg16(0xC000, prg |7);
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break;
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case 2: case 6:
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setprg8(0x8000, prg <<1 | latchData >>7);
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setprg8(0xA000, prg <<1 | latchData >>7);
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setprg8(0xC000, prg <<1 | latchData >>7);
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setprg8(0xE000, prg <<1 | latchData >>7);
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break;
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case 3: case 7:
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setprg16(0x8000, prg);
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setprg16(0xC000, prg);
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break;
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case 5:
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setprg8(0x6000, prg <<1 | latchData >>7);
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setprg32(0x8000, prg >>1 |3);
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break;
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}
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setchr8(0);
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setmirror(latchData &0x40? MI_H: MI_V);
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}
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static DECLFW(Mapper354_WriteLatch)
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{
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latchData =V;
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latchAddr =A &0xFFFF;
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Mapper354_Sync();
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}
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static void Mapper354_Reset(void)
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{
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latchAddr =latchData =0;
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Mapper354_Sync();
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}
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static void Mapper354_Power(void)
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{
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latchAddr =latchData =0;
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(submapper ==1? 0xE000: 0xF000, 0xFFFF, Mapper354_WriteLatch);
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Mapper354_Sync();
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}
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void Mapper354_Init(CartInfo *info)
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{
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submapper = info->submapper;
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info->Power =Mapper354_Power;
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info->Reset =Mapper354_Reset;
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AddExState(StateRegs, ~0, 0, 0);
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}
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