fceux/mappers/15.c

74 lines
1.8 KiB
C

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2003 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 Sync(void)
{
int x;
setmirror(((mapbyte1[0]>>6)&1)^1);
switch(mapbyte1[1]&0x3)
{
case 0x0:
for(x=0;x<4;x++)
setprg8(0x8000+x*8192,(((mapbyte1[0]&0x7F)<<1)+x)^(mapbyte1[0]>>7));
break;
case 0x2:
for(x=0;x<4;x++)
setprg8(0x8000+x*8192,((mapbyte1[0]&0x7F)<<1)+(mapbyte1[0]>>7));
break;
case 0x1:
case 0x3:
for(x=0;x<4;x++)
{
unsigned int b;
b=mapbyte1[0]&0x7F;
if(x>=2 && !(mapbyte1[1]&0x2))
b=0x7F;
setprg8(0x8000+x*8192,(x&1)+((b<<1)^(mapbyte1[0]>>7)));
}
break;
}
}
static DECLFW(Mapper15_write)
{
mapbyte1[0]=V;
mapbyte1[1]=A&3;
Sync();
}
static void StateRestore(int version)
{
Sync();
}
void Mapper15_init(void)
{
mapbyte1[0]=mapbyte1[1]=0;
Sync();
GameStateRestore=StateRestore;
SetWriteHandler(0x8000,0xFFFF,Mapper15_write);
}