mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
107 lines
2.9 KiB
C++
107 lines
2.9 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
|
|
* (VRC4 mapper)
|
|
*/
|
|
|
|
#include "mapinc.h"
|
|
|
|
static uint8 IRQCount;
|
|
static uint8 IRQa;
|
|
static uint8 prg_reg[2];
|
|
static uint8 chr_reg[8];
|
|
static uint8 mirr;
|
|
|
|
static SFORMAT StateRegs[]=
|
|
{
|
|
{&IRQCount, 1, "IRQC"},
|
|
{&IRQa, 1, "IRQA"},
|
|
{prg_reg, 2, "PRG"},
|
|
{chr_reg, 8, "CHR"},
|
|
{&mirr, 1, "MIRR"},
|
|
{0}
|
|
};
|
|
|
|
static void M222IRQ(void)
|
|
{
|
|
if(IRQa)
|
|
{
|
|
IRQCount++;
|
|
if(IRQCount>=238)
|
|
{
|
|
X6502_IRQBegin(FCEU_IQEXT);
|
|
// IRQa=0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void Sync(void)
|
|
{
|
|
int i;
|
|
setprg8(0x8000,prg_reg[0]);
|
|
setprg8(0xA000,prg_reg[1]);
|
|
for(i=0; i<8; i++)
|
|
setchr1(i<<10,chr_reg[i]);
|
|
setmirror(mirr^1);
|
|
}
|
|
|
|
static DECLFW(M222Write)
|
|
{
|
|
switch(A&0xF003)
|
|
{
|
|
case 0x8000: prg_reg[0]=V; break;
|
|
case 0x9000: mirr=V&1; break;
|
|
case 0xA000: prg_reg[1]=V; break;
|
|
case 0xB000: chr_reg[0]=V; break;
|
|
case 0xB002: chr_reg[1]=V; break;
|
|
case 0xC000: chr_reg[2]=V; break;
|
|
case 0xC002: chr_reg[3]=V; break;
|
|
case 0xD000: chr_reg[4]=V; break;
|
|
case 0xD002: chr_reg[5]=V; break;
|
|
case 0xE000: chr_reg[6]=V; break;
|
|
case 0xE002: chr_reg[7]=V; break;
|
|
// case 0xF000: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break;
|
|
// / case 0xF001: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQCount=V; break;
|
|
// case 0xF002: FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
|
|
// case 0xD001: IRQa=V; X6502_IRQEnd(FCEU_IQEXT); FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
|
|
// case 0xC001: IRQPre=16; FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
|
|
case 0xF000: IRQa=IRQCount=V; if(scanline<240) IRQCount-=8; else IRQCount+=4; X6502_IRQEnd(FCEU_IQEXT); break;
|
|
}
|
|
Sync();
|
|
}
|
|
|
|
static void M222Power(void)
|
|
{
|
|
setprg16(0xC000,~0);
|
|
SetReadHandler(0x8000,0xFFFF,CartBR);
|
|
SetWriteHandler(0x8000,0xFFFF,M222Write);
|
|
}
|
|
|
|
static void StateRestore(int version)
|
|
{
|
|
Sync();
|
|
}
|
|
|
|
void Mapper222_Init(CartInfo *info)
|
|
{
|
|
info->Power=M222Power;
|
|
GameHBIRQHook=M222IRQ;
|
|
GameStateRestore=StateRestore;
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
|
}
|