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https://github.com/dborth/fceugx.git
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105 lines
2.8 KiB
C
105 lines
2.8 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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static void Fixerit(void)
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{
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switch(mapbyte2[0]&3)
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{
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case 0:vnapage[0]=vnapage[2]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
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vnapage[1]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
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break;
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case 1:vnapage[0]=vnapage[1]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
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vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
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break;
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case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
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break;
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case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
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break;
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}
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}
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DECLFW(Mapper68_write)
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{
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A&=0xF000;
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if(A>=0x8000 && A<=0xB000)
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{
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VROM_BANK2((A-0x8000)>>1,V);
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}
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else switch(A)
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{
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case 0xc000:mapbyte1[0]=V;
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if(VROM_size && mapbyte2[0]&0x10)
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Fixerit();
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break;
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case 0xd000:mapbyte1[1]=V;
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if(VROM_size && mapbyte2[0]&0x10)
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Fixerit();
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break;
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case 0xe000: mapbyte2[0]=V;
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if(!(V&0x10))
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{
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switch(V&3)
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{
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case 0:MIRROR_SET2(1);break;
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case 1:MIRROR_SET2(0);break;
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case 2:onemir(0);break;
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case 3:onemir(1);break;
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}
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}
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else if(VROM_size)
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{
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Fixerit();
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PPUNTARAM=0;
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}
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break;
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case 0xf000: ROM_BANK16(0x8000,V);break;
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}
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}
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static void Mapper68_StateRestore(int version)
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{
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if(!(mapbyte2[0]&0x10))
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{
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switch(mapbyte2[0]&3)
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{
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case 0:MIRROR_SET(0);break;
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case 1:MIRROR_SET(1);break;
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case 2:onemir(0);break;
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case 3:onemir(1);break;
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}
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}
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else if(VROM_size)
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{
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Fixerit();
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PPUNTARAM=0;
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}
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}
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void Mapper68_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper68_write);
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MapStateRestore=Mapper68_StateRestore;
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}
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