108 lines
1.9 KiB
C++
108 lines
1.9 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 r1 mapbyte1[0]
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#define r2 mapbyte1[1]
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static void DoBS(void)
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{
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if(r1&0x40)
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{
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ROM_BANK32((r1&0xE)|(r2&1));
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VROM_BANK8( ((r1&0xE)<<2) | ((r2>>4)&7) );
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}
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else
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{
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ROM_BANK32(r1&0xF);
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VROM_BANK8( ((r1&0xF)<<2) | ((r2>>4)&3) );
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}
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}
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static void R1Set(uint8 V)
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{
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if(r1) return;
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r1=V;
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MIRROR_SET(V>>7);
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DoBS();
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}
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static void R2Set(uint8 V)
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{
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r2=V;
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DoBS();
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}
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DECLFW(R1W)
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{
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R1Set(V);
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}
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DECLFR(R1R)
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{
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uint8 r=CartBR(A);
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R1Set(r);
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return r;
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}
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DECLFW(R2W)
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{
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R2Set(V);
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}
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DECLFR(R2R)
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{
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uint8 r=CartBR(A);
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R2Set(r);
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return r;
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}
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static void M15Restore(int version)
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{
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DoBS();
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MIRROR_SET(r1>>7);
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}
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static void M15Reset(void)
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{
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r1=r2=0;
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DoBS();
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MIRROR_SET(0);
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}
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void Mapper234_init(void)
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{
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SetWriteHandler(0xff80,0xff9f,R1W);
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SetReadHandler(0xff80,0xff9f,R1R);
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SetWriteHandler(0xffe8,0xfff7,R2W);
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SetReadHandler(0xffe8,0xfff7,R2R);
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SetReadHandler(0x6000,0x7FFF,0);
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SetWriteHandler(0x6000,0x7FFF,0);
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M15Reset();
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GameStateRestore=M15Restore;
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MapperReset=M15Reset;
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}
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