fceux/boards/57.cpp

93 lines
2.0 KiB
C++

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2005 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"
static uint8 prg_reg;
static uint8 chr_reg;
static uint8 hrd_flag;
static SFORMAT StateRegs[]=
{
{&hrd_flag, 1, "DIPSW"},
{&prg_reg, 1, "PRG"},
{&chr_reg, 1, "CHR"},
{0}
};
static void Sync(void)
{
if(prg_reg&0x80)
setprg32(0x8000,prg_reg>>6);
else
{
setprg16(0x8000,(prg_reg>>5)&3);
setprg16(0xC000,(prg_reg>>5)&3);
}
setmirror((prg_reg&8)>>3);
setchr8((chr_reg&3)|(prg_reg&7)|((prg_reg&0x10)>>1));
}
static DECLFR(M57Read)
{
return hrd_flag;
}
static DECLFW(M57Write)
{
if((A&0x8800)==0x8800)
prg_reg=V;
else
chr_reg=V;
Sync();
}
static void M57Power(void)
{
prg_reg=0;
chr_reg=0;
hrd_flag=0;
SetReadHandler(0x8000,0xFFFF,CartBR);
SetWriteHandler(0x8000,0xFFFF,M57Write);
SetReadHandler(0x6000,0x6000,M57Read);
Sync();
}
static void M57Reset()
{
hrd_flag++;
hrd_flag&=3;
FCEU_printf("Select Register = %02x\n",hrd_flag);
}
static void StateRestore(int version)
{
Sync();
}
void Mapper57_Init(CartInfo *info)
{
info->Power=M57Power;
info->Reset=M57Reset;
GameStateRestore=StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}