fceux/mappers/51.cpp

67 lines
1.5 KiB
C++

/* 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"
#define mode mapbyte1[0]
#define page mapbyte1[1]
static uint32 Get8K(uint32 A)
{
uint32 bank;
bank=(page<<2)|((A>>13)&1);
if(A&0x4000 && !(mode&1)) bank|=0xC;
if(!(A&0x8000)) bank|=0x20;
if(mode==2) bank|=2;
else bank|=(A>>13)&2;
return(bank);
}
static void Synco(void)
{
uint32 x;
if(mapbyte1[0]<=2)
MIRROR_SET2(1);
else
MIRROR_SET2(0);
for(x=0x6000;x<0x10000;x+=8192)
ROM_BANK8(x,Get8K(x));
}
static DECLFW(Write)
{
if(A&0x8000) mapbyte1[1]=V&0xF;
else mapbyte1[0]=(mapbyte1[0]&2)|((V>>1)&1);
if(A&0x4000) mapbyte1[0]=(mapbyte1[0]&1)|((V>>3)&2);
Synco();
}
void Mapper51_init(void)
{
SetWriteHandler(0x6000,0xFFFF,Write);
SetReadHandler(0x6000,0xFFFF,CartBR);
mapbyte1[0]=1;
mapbyte1[1]=0;
Synco();
}