fceux/mappers/68.c

106 lines
3.0 KiB
C
Raw Normal View History

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 Xodnizel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "mapinc.h"
static void Fixerit(void)
{
switch(mapbyte2[0]&3)
{
case 0:vnapage[0]=vnapage[2]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
vnapage[1]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
break;
case 1:vnapage[0]=vnapage[1]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
break;
case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
break;
case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
break;
}
}
DECLFW(Mapper68_write)
{
// FCEU_printf("%04x,%04x\n",A,V);
A&=0xF000;
if(A>=0x8000 && A<=0xB000)
{
VROM_BANK2((A-0x8000)>>1,V);
}
else switch(A)
{
case 0xc000:mapbyte1[0]=V;
if(VROM_size && mapbyte2[0]&0x10)
Fixerit();
break;
case 0xd000:mapbyte1[1]=V;
if(VROM_size && mapbyte2[0]&0x10)
Fixerit();
break;
case 0xe000: mapbyte2[0]=V;
if(!(V&0x10))
{
switch(V&3)
{
case 0:MIRROR_SET2(1);break;
case 1:MIRROR_SET2(0);break;
case 2:onemir(0);break;
case 3:onemir(1);break;
}
}
else if(VROM_size)
{
Fixerit();
PPUNTARAM=0;
}
break;
case 0xf000: ROM_BANK16(0x8000,V);break;
}
}
static void Mapper68_StateRestore(int version)
{
if(!(mapbyte2[0]&0x10))
{
switch(mapbyte2[0]&3)
{
case 0:MIRROR_SET(0);break;
case 1:MIRROR_SET(1);break;
case 2:onemir(0);break;
case 3:onemir(1);break;
}
}
else if(VROM_size)
{
Fixerit();
PPUNTARAM=0;
}
}
void Mapper68_init(void)
{
SetWriteHandler(0x8000,0xffff,Mapper68_write);
MapStateRestore=Mapper68_StateRestore;
}