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https://github.com/dborth/fceugx.git
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106 lines
2.1 KiB
C
106 lines
2.1 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 rg mapbyte1
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static void DoPRG(void)
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{
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int32 b=((rg[0]>>1)&0xF) | ((rg[0]>>3)&0x10) | ((rg[1]&1)<<5);
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if(rg[0]&0x20) // 16 KB
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{
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ROM_BANK16(0x8000,(b<<1)|(rg[0]&1));
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ROM_BANK16(0xC000,(b<<1)|(rg[0]&1));
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}
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else
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ROM_BANK32(b);
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}
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static DECLFW(Mapper226_write)
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{
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rg[A&1]=V;
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DoPRG();
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if(A&1)
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{
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if(rg[1]&2)
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PPUCHRRAM=0; // Write protected.
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else
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PPUCHRRAM=0xFF; // Not write protected.
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}
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else
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MIRROR_SET2((rg[0]>>6)&1);
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}
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static void M26Reset(void)
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{
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rg[0]=rg[1]=0;
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DoPRG();
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PPUCHRRAM=0xFF;
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MIRROR_SET2(0);
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}
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static void M26Restore(int version)
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{
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DoPRG();
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if(rg[1]&2)
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PPUCHRRAM=0; // Write protected.
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else
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PPUCHRRAM=0xFF; // Not write protected.
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MIRROR_SET2((rg[0]>>6)&1);
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}
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void Mapper226_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper226_write);
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MapperReset=M26Reset;
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GameStateRestore=M26Restore;
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M26Reset();
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}
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#ifdef OLD // What the heck is this??
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DECLFW(Mapper226_write)
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{
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MIRROR_SET((A>>13)&1);
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VROM_BANK8(A&0x7F);
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if(A&0x1000)
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{
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if(A&0x40)
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{
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ROM_BANK16(0x8000,(((A>>7))<<1)+1);
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ROM_BANK16(0xC000,(((A>>7))<<1)+1);
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}
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else
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{
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ROM_BANK16(0x8000,(((A>>7))<<1));
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ROM_BANK16(0xC000,(((A>>7))<<1));
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}
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}
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else
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{
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ROM_BANK32(A>>7);
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}
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}
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void Mapper226_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper226_write);
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}
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#endif
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