fceux/mappers/227.cpp

80 lines
1.6 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 rg mapbyte1
static void DoSync(uint32 A)
{
int32 p=((A>>3)&0xF) | ((A>>4)&0x10);
rg[0]=A;
rg[1]=A>>8;
MIRROR_SET((A>>1)&1);
if(A&1) //32 KB
{
ROM_BANK32(p);
}
else //16 KB
{
ROM_BANK16(0x8000,(p<<1)|((A&4)>>2));
ROM_BANK16(0xc000,(p<<1)|((A&4)>>2));
}
if(A&0x80)
{
PPUCHRRAM=0;
}
else
{
PPUCHRRAM=0xFF;
if(A&0x200)
ROM_BANK16(0xC000,(p<<1)|7);
else
ROM_BANK16(0xC000,(p<<1)&(~7));
}
}
static DECLFW(Mapper227_write)
{
rg[A&1]=V;
DoSync(A);
}
static void M227Reset(void)
{
rg[0]=rg[1]=0;
DoSync(0);
}
static void M227Restore(int version)
{
DoSync(rg[0]|(rg[1]<<8));
}
void Mapper227_init(void)
{
SetWriteHandler(0x6000,0xffff,Mapper227_write);
MapperReset=M227Reset;
GameStateRestore=M227Restore;
M227Reset();
}