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https://github.com/dborth/fceugx.git
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80 lines
1.6 KiB
C
80 lines
1.6 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) 2002 Xodnizel
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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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#include "mapinc.h"
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#define rg mapbyte1
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static void DoSync(uint32 A)
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{
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int32 p=((A>>3)&0xF) | ((A>>4)&0x10);
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rg[0]=A;
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rg[1]=A>>8;
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MIRROR_SET((A>>1)&1);
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if(A&1) //32 KB
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{
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ROM_BANK32(p);
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}
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else //16 KB
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{
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ROM_BANK16(0x8000,(p<<1)|((A&4)>>2));
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ROM_BANK16(0xc000,(p<<1)|((A&4)>>2));
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}
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if(A&0x80)
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{
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PPUCHRRAM=0;
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}
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else
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{
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PPUCHRRAM=0xFF;
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if(A&0x200)
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ROM_BANK16(0xC000,(p<<1)|7);
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else
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ROM_BANK16(0xC000,(p<<1)&(~7));
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}
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}
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static DECLFW(Mapper227_write)
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{
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rg[A&1]=V;
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DoSync(A);
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}
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static void M227Reset(void)
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{
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rg[0]=rg[1]=0;
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DoSync(0);
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}
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static void M227Restore(int version)
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{
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DoSync(rg[0]|(rg[1]<<8));
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}
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void Mapper227_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper227_write);
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MapperReset=M227Reset;
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GameStateRestore=M227Restore;
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M227Reset();
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}
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