104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2005 CaH4e3
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "mapinc.h"
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static uint8 IRQCount, IRQPre;
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static uint8 IRQa;
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static uint8 prg_reg[2];
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static uint8 chr_reg[8];
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static SFORMAT StateRegs[]=
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{
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{&IRQCount, 1, "IRQC"},
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{&IRQa, 1, "IRQA"},
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{prg_reg, 2, "PRG"},
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{chr_reg, 8, "CHR"},
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{0}
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};
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static void M222IRQ(void)
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{
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if(IRQa)
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{
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IRQCount++;
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if((IRQCount)>=240)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa=0;
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}
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}
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}
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static void Sync(void)
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{
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int i;
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setprg8(0x8000,prg_reg[0]);
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setprg8(0xA000,prg_reg[1]);
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for(i=0; i<8; i++)
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setchr1(i<<10,chr_reg[i]);
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}
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static DECLFW(M222Write)
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{
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switch(A&0xF003)
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{
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case 0x8000: prg_reg[0]=V; break;
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case 0xA000: prg_reg[1]=V; break;
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case 0xB000: chr_reg[0]=V; break;
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case 0xB002: chr_reg[1]=V; break;
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case 0xC000: chr_reg[2]=V; break;
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case 0xC002: chr_reg[3]=V; break;
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case 0xD000: chr_reg[4]=V; break;
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case 0xD002: chr_reg[5]=V; break;
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case 0xE000: chr_reg[6]=V; break;
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case 0xE002: chr_reg[7]=V; break;
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// case 0xF000: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break;
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// / case 0xF001: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQCount=V; break;
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// case 0xF002: FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
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// case 0xD001: IRQa=V; X6502_IRQEnd(FCEU_IQEXT); FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
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case 0xC001: IRQPre=0; FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
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case 0xF000: IRQPre=8; IRQCount=V; IRQa=V; X6502_IRQEnd(FCEU_IQEXT); FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;
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default: FCEU_printf("%04x:%02x %d\n",A,V,scanline);
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}
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Sync();
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}
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static void M222Power(void)
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{
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setprg16(0xC000,~0);
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x8000,0xFFFF,M222Write);
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void Mapper222_Init(CartInfo *info)
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{
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info->Power=M222Power;
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GameHBIRQHook=M222IRQ;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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