fceux/mappers/230.cpp

63 lines
1.8 KiB
C++
Raw Normal View History

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2003 CaH4e3
*
* 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 rom_sw mapbyte1[0]
void Mapper230_Reset(void)
{
rom_sw ^= 1; //1 - rom_sw;
if( rom_sw ) {
ROM_BANK16(0x8000,0);
ROM_BANK16(0xc000,7);
} else {
ROM_BANK16(0x8000,8);
ROM_BANK16(0xc000,39);
}
MIRROR_SET2(1);
}
static DECLFW(Mapper230_write)
{
if( rom_sw ) {
ROM_BANK16( 0x8000, V&0x07 );
} else {
if( V & 0x20 ) {
ROM_BANK16( 0x8000, (V&0x1F)+8 );
ROM_BANK16( 0xc000, (V&0x1F)+8 );
} else {
ROM_BANK32( ((V&0x1E) >> 1) + 4 );
}
MIRROR_SET2( ((V & 0x40) >> 6) );
}
}
void Mapper230_init(void)
{
ROM_BANK16(0x8000,0);
ROM_BANK16(0xc000,7);
SetWriteHandler(0x8000, 0xffff, Mapper230_write);
MapperReset = Mapper230_Reset;
rom_sw = 1;
}