fceux/boards/bmc64in1nr.c

94 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
*
* BMC 42-in-1 reset switch
*/
#include "mapinc.h"
static uint8 regs[4];
static SFORMAT StateRegs[]=
{
{regs, 4, "REGS"},
{0}
};
static void Sync(void)
{
if(regs[0]&0x80)
{
if(regs[1]&0x80)
setprg32(0x8000,regs[1]&0x1F);
else
{
int bank=((regs[1]&0x1f)<<1)|((regs[1]>>6)&1);
setprg16(0x8000,bank);
setprg16(0xC000,bank);
}
}
else
{
int bank=((regs[1]&0x1f)<<1)|((regs[1]>>6)&1);
setprg16(0xC000,bank);
}
if(regs[0]&0x20)
setmirror(MI_H);
else
setmirror(MI_V);
setchr8((regs[2]<<2)|((regs[0]>>1)&3));
}
static DECLFW(BMC64in1nrWriteLo)
{
regs[A&3]=V;
Sync();
}
static DECLFW(BMC64in1nrWriteHi)
{
regs[3]=V;
Sync();
}
static void BMC64in1nrPower(void)
{
regs[0]=0x80;
regs[1]=0x43;
regs[2]=regs[3]=0;
Sync();
SetWriteHandler(0x5000,0x5003,BMC64in1nrWriteLo);
SetWriteHandler(0x8000,0xFFFF,BMC64in1nrWriteHi);
SetReadHandler(0x8000,0xFFFF,CartBR);
}
static void StateRestore(int version)
{
Sync();
}
void BMC64in1nr_Init(CartInfo *info)
{
info->Power=BMC64in1nrPower;
AddExState(&StateRegs, ~0, 0, 0);
GameStateRestore=StateRestore;
}