fceux/boards/super24.c

100 lines
2.3 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 *CHRRAM = NULL;
static int masko8[8]={63,31,15,1,3,0,0,0};
static void Super24PW(uint32 A, uint8 V)
{
uint32 NV=V&masko8[EXPREGS[0]&7];
NV|=(EXPREGS[1]<<1);
setprg8r((NV>>6)&0xF,A,NV);
}
static void Super24CW(uint32 A, uint8 V)
{
if(EXPREGS[0]&0x20)
setchr1r(0x10,A,V);
else
{
uint32 NV=V|(EXPREGS[2]<<3);
setchr1r((NV>>9)&0xF,A,NV);
}
}
static DECLFW(Super24Write)
{
switch(A)
{
case 0x5FF0: EXPREGS[0]=V;
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
break;
case 0x5FF1: EXPREGS[1]=V;
FixMMC3PRG(MMC3_cmd);
break;
case 0x5FF2: EXPREGS[2]=V;
FixMMC3CHR(MMC3_cmd);
break;
}
}
static void Super24Power(void)
{
EXPREGS[0]=0x24;
EXPREGS[1]=159;
EXPREGS[2]=0;
GenMMC3Power();
SetWriteHandler(0x5000,0x7FFF,Super24Write);
SetReadHandler(0x8000,0xFFFF,CartBR);
}
static void Super24Reset(void)
{
EXPREGS[0]=0x24;
EXPREGS[1]=159;
EXPREGS[2]=0;
MMC3RegReset();
}
static void Super24Close(void)
{
if(CHRRAM)
FCEU_gfree(CHRRAM);
CHRRAM = NULL;
}
void Super24_Init(CartInfo *info)
{
GenMMC3_Init(info, 128, 256, 0, 0);
info->Power=Super24Power;
info->Reset=Super24Reset;
info->Close=Super24Close;
cwrap=Super24CW;
pwrap=Super24PW;
CHRRAM=(uint8*)FCEU_gmalloc(8192);
SetupCartCHRMapping(0x10, CHRRAM, 8192, 1);
AddExState(CHRRAM, 8192, 0, "CHRR");
AddExState(EXPREGS, 3, 0, "BIG2");
}