mirror of
https://github.com/dborth/fceugx.git
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93 lines
2.0 KiB
C++
93 lines
2.0 KiB
C++
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2005 CaH4e3
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "mapinc.h"
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static uint8 prg_reg;
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static uint8 chr_reg;
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static uint8 hrd_flag;
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static SFORMAT StateRegs[]=
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{
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{&hrd_flag, 1, "DIPSW"},
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{&prg_reg, 1, "PRG"},
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{&chr_reg, 1, "CHR"},
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{0}
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};
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static void Sync(void)
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{
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if(prg_reg&0x80)
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setprg32(0x8000,prg_reg>>6);
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else
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{
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setprg16(0x8000,(prg_reg>>5)&3);
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setprg16(0xC000,(prg_reg>>5)&3);
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}
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setmirror((prg_reg&8)>>3);
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setchr8((chr_reg&3)|(prg_reg&7)|((prg_reg&0x10)>>1));
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}
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static DECLFR(M57Read)
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{
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return hrd_flag;
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}
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static DECLFW(M57Write)
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{
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if((A&0x8800)==0x8800)
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prg_reg=V;
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else
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chr_reg=V;
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Sync();
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}
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static void M57Power(void)
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{
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prg_reg=0;
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chr_reg=0;
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hrd_flag=0;
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x8000,0xFFFF,M57Write);
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SetReadHandler(0x6000,0x6000,M57Read);
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Sync();
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}
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static void M57Reset()
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{
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hrd_flag++;
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hrd_flag&=3;
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FCEU_printf("Select Register = %02x\n",hrd_flag);
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void Mapper57_Init(CartInfo *info)
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{
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info->Power=M57Power;
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info->Reset=M57Reset;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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