fceux/mappers/22.cpp

64 lines
1.7 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 K4buf mapbyte2
DECLFW(Mapper22_write)
{
if(A<=0xAFFF)
{
switch(A&0xF000)
{
case 0x8000:ROM_BANK8(0x8000,V);break;
case 0xa000:ROM_BANK8(0xA000,V);break;
case 0x9000:switch(V&3)
{
case 0x00:MIRROR_SET2(1);break;
case 0x01:MIRROR_SET2(0);break;
case 0x02:onemir(0);break;
case 0x03:onemir(1);break;
}
break;
}
}
else
{
A&=0xF003;
if(A>=0xb000 && A<=0xe003)
{
int x=(A&1)|((A-0xB000)>>11);
K4buf[x]&=(0xF0)>>((A&2)<<1);
K4buf[x]|=(V&0xF)<<((A&2)<<1);
VROM_BANK1(x<<10,K4buf[x]>>1);
}
}
}
void Mapper22_init(void)
{
SetWriteHandler(0x8000,0xffff,Mapper22_write);
}