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63 lines
1.5 KiB
C
63 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 ctrl mapbyte1[6]
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static void DoCHR(void)
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{
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int x;
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for(x=0;x<2;x++)
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VROM_BANK2((x<<11)|((ctrl&2)<<11),mapbyte1[x]>>1);
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for(x=0;x<4;x++)
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VROM_BANK1((x<<10) | (((ctrl&2)^2)<<11),mapbyte1[2+x]);
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}
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static DECLFW(Mapper82_write)
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{
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if(A<=0x7EF5)
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{
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mapbyte1[A&7]=V;
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DoCHR();
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}
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else
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switch(A)
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{
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case 0x7ef6:ctrl=V&3;
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MIRROR_SET2(V&1);
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DoCHR();
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break;
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case 0x7efa:V>>=2;mapbyte2[0]=V;ROM_BANK8(0x8000,V);break;
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case 0x7efb:V>>=2;mapbyte2[1]=V;ROM_BANK8(0xa000,V);break;
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case 0x7efc:V>>=2;mapbyte2[2]=V;ROM_BANK8(0xc000,V);break;
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}
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}
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void Mapper82_init(void)
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{
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ROM_BANK8(0xE000,~0);
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/* external WRAM might end at $73FF */
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SetWriteHandler(0x7ef0,0x7efc,Mapper82_write);
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}
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