fceux/boards/t-262.cpp

85 lines
1.9 KiB
C++

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2006 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 uint16 addrreg;
static uint8 datareg;
static uint8 busy;
static SFORMAT StateRegs[]=
{
{&addrreg, 2, "ADDRREG"},
{&datareg, 1, "DATAREG"},
{&busy, 1, "BUSY"},
{0}
};
static void Sync(void)
{
uint16 base=((addrreg&0x60)>>2)|((addrreg&0x100)>>3);
setprg16(0x8000,(datareg&7)|base);
setprg16(0xC000,7|base);
setmirror(((addrreg&2)>>1)^1);
}
static DECLFW(BMCT262Write)
{
if(busy||(A==0x8000))
datareg=V;
else
{
addrreg=A;
busy=1;
}
Sync();
}
static void BMCT262Power(void)
{
setchr8(0);
SetWriteHandler(0x8000,0xFFFF,BMCT262Write);
SetReadHandler(0x8000,0xFFFF,CartBR);
busy=0;
addrreg=0;
datareg=0xff;
Sync();
}
static void BMCT262Reset(void)
{
busy=0;
addrreg=0;
datareg=0;
Sync();
}
static void BMCT262Restore(int version)
{
Sync();
}
void BMCT262_Init(CartInfo *info)
{
info->Power=BMCT262Power;
info->Reset=BMCT262Reset;
GameStateRestore=BMCT262Restore;
AddExState(&StateRegs, ~0, 0, 0);
}