122 lines
2.7 KiB
C++
122 lines
2.7 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 MMC4reg mapbyte1
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#define latcha1 mapbyte2[0]
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#define latcha2 mapbyte2[1]
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static void FP_FASTAPASS(1) latchcheck(uint32 VAddr)
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{
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uint8 l,h;
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h=VAddr>>8;
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if(h>=0x20 || ((h&0xF)!=0xF))
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return;
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l=VAddr&0xF0;
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if(h<0x10)
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{
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if(l==0xD0)
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{
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VROM_BANK4(0x0000,MMC4reg[0]);
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latcha1=0xFD;
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}
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else if(l==0xE0)
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{
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VROM_BANK4(0x0000,MMC4reg[1]);
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latcha1=0xFE;
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}
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}
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else
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{
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if(l==0xD0)
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{
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VROM_BANK4(0x1000,MMC4reg[2]);
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latcha2=0xFD;
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}
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else if(l==0xE0)
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{
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VROM_BANK4(0x1000,MMC4reg[3]);
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latcha2=0xFE;
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}
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}
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}
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DECLFW(Mapper9_write) // $Axxx
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{
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ROM_BANK8(0x8000,V);
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}
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DECLFW(Mapper10_write)
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{
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ROM_BANK16(0x8000,V);
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}
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DECLFW(Mapper9and10_write)
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{
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switch(A&0xF000)
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{
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case 0xB000:
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if(latcha1==0xFD) { VROM_BANK4(0x0000,V);}
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MMC4reg[0]=V;
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break;
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case 0xC000:
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if(latcha1==0xFE) {VROM_BANK4(0x0000,V);}
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MMC4reg[1]=V;
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break;
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case 0xD000:
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if(latcha2==0xFD) {VROM_BANK4(0x1000,V);}
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MMC4reg[2]=V;
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break;
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case 0xE000:
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if(latcha2==0xFE) {VROM_BANK4(0x1000,V);}
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MMC4reg[3]=V;
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break;
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case 0xF000:
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MIRROR_SET(V&1);
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break;
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}
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}
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void Mapper9_init(void)
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{
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latcha1=0xFE;
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latcha2=0xFE;
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ROM_BANK8(0xA000,~2);
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ROM_BANK8(0x8000,0);
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SetWriteHandler(0xA000,0xAFFF,Mapper9_write);
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SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write);
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PPU_hook=latchcheck;
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}
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void Mapper10_init(void)
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{
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latcha1=latcha2=0xFE;
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SetWriteHandler(0xA000,0xAFFF,Mapper10_write);
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SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write);
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PPU_hook=latchcheck;
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}
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