fceux/boards/sl1632.cpp

113 lines
2.5 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"
#include "mmc3.h"
static uint8 chrcmd[8], prg0, prg1, brck, mirr;
static SFORMAT StateRegs[]=
{
{chrcmd, 8, "CHRCMD"},
{&prg0, 1, "PRG0"},
{&prg1, 1, "PRG1"},
{&brck, 1, "BRK"},
{&mirr, 1, "MIRR"},
{0}
};
static void Sync(void)
{
int i;
setprg8(0x8000,prg0);
setprg8(0xA000,prg1);
setprg8(0xC000,~1);
setprg8(0xE000,~0);
for(i=0; i<8; i++)
setchr1(i<<10,chrcmd[i]);
setmirror(mirr^1);
}
static void UNLSL1632CW(uint32 A, uint8 V)
{
setchr1(A,V);
}
static DECLFW(UNLSL1632CMDWrite)
{
// FCEU_printf("bs %04x %02x %3d\n",A,V,scanline);
if((A&0xA131)==0xA131)
{
brck=V;
}
if(brck&2)
{
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
if(A<0xC000)
MMC3_CMDWrite(A,V);
else
MMC3_IRQWrite(A,V);
}
else
{
if((A>=0xB000)&&(A<=0xE003))
{
int ind=((((A&2)|(A>>10))>>1)+2)&7;
int sar=((A&1)<<2);
chrcmd[ind]=(chrcmd[ind]&(0xF0>>sar))|((V&0x0F)<<sar);
}
else
switch(A&0xF003)
{
case 0x8000: prg0=V; break;
case 0xA000: prg1=V; break;
case 0x9000: mirr=V&1; break;
}
Sync();
}
}
static void StateRestore(int version)
{
if(brck&2)
{
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
}
else
Sync();
}
static void UNLSL1632Power(void)
{
GenMMC3Power();
SetReadHandler(0x8000,0xFFFF,CartBR);
SetWriteHandler(0x8000,0xFFFF,UNLSL1632CMDWrite);
}
void UNLSL1632_Init(CartInfo *info)
{
GenMMC3_Init(info, 256, 256, 0, 0);
cwrap=UNLSL1632CW;
info->Power=UNLSL1632Power;
GameStateRestore=StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}