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https://github.com/dborth/fceugx.git
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67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* 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 mode mapbyte1[0]
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#define page mapbyte1[1]
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static uint32 Get8K(uint32 A)
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{
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uint32 bank;
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bank=(page<<2)|((A>>13)&1);
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if(A&0x4000 && !(mode&1)) bank|=0xC;
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if(!(A&0x8000)) bank|=0x20;
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if(mode==2) bank|=2;
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else bank|=(A>>13)&2;
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return(bank);
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}
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static void Synco(void)
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{
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uint32 x;
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if(mapbyte1[0]<=2)
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MIRROR_SET2(1);
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else
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MIRROR_SET2(0);
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for(x=0x6000;x<0x10000;x+=8192)
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ROM_BANK8(x,Get8K(x));
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}
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static DECLFW(Write)
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{
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if(A&0x8000) mapbyte1[1]=V&0xF;
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else mapbyte1[0]=(mapbyte1[0]&2)|((V>>1)&1);
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if(A&0x4000) mapbyte1[0]=(mapbyte1[0]&1)|((V>>3)&2);
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Synco();
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}
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void Mapper51_init(void)
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{
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SetWriteHandler(0x6000,0xFFFF,Write);
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SetReadHandler(0x6000,0xFFFF,CartBR);
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mapbyte1[0]=1;
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mapbyte1[1]=0;
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Synco();
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}
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