fceux/boards/deirom.cpp

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/* 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"
static uint8 cmd;
static uint8 DRegs[8];
static SFORMAT DEI_StateRegs[]=
{
{&cmd, 1, "CMD"},
{DRegs, 8, "DREG"},
{0}
};
static void Sync(void)
{
int x;
setchr2(0x0000,DRegs[0]);
setchr2(0x0800,DRegs[1]);
for(x=0;x<4;x++)
setchr1(0x1000+(x<<10),DRegs[2+x]);
setprg8(0x8000,DRegs[6]);
setprg8(0xa000,DRegs[7]);
}
static void StateRestore(int version)
{
Sync();
}
static DECLFW(DEIWrite)
{
switch(A&0x8001)
{
case 0x8000: cmd=V&0x07; break;
case 0x8001: if(cmd<=0x05)
V&=0x3F;
else
V&=0x0F;
if(cmd<=0x01) V>>=1;
DRegs[cmd&0x07]=V;
Sync();
break;
}
}
static void DEIPower(void)
{
setprg8(0xc000,0xE);
setprg8(0xe000,0xF);
cmd=0;
memset(DRegs,0,8);
Sync();
SetReadHandler(0x8000,0xFFFF,CartBR);
SetWriteHandler(0x8000,0xFFFF,DEIWrite);
}
void DEIROM_Init(CartInfo *info)
{
info->Power=DEIPower;
GameStateRestore=StateRestore;
AddExState(&DEI_StateRegs, ~0, 0, 0);
}