118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* 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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* Gimmick Bootleg
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*/
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#include "mapinc.h"
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static uint8 prg[4];
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static uint8 chr[8];
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static uint8 IRQCount;
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static uint8 IRQPre;
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static uint8 IRQa;
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static SFORMAT StateRegs[]=
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{
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{prg, 4, "PRG"},
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{chr, 8, "CHR"},
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{&IRQCount, 1, "IRQCOUNT"},
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{&IRQPre, 1, "IRQPRE"},
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{&IRQa, 1, "IRQA"},
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{0}
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};
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static void SyncPrg(void)
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{
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setprg8(0x6000,0);
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setprg8(0x8000,prg[0]);
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setprg8(0xA000,prg[1]);
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setprg8(0xC000,prg[2]);
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setprg8(0xE000,~0);
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}
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static void SyncChr(void)
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{
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int i;
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for(i=0; i<8; i++)
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setchr1(i<<10,chr[i]);
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}
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static void StateRestore(int version)
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{
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SyncPrg();
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SyncChr();
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}
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static DECLFW(M183Write)
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{
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if(((A&0xF80C)>=0xB000)&&((A&0xF80C)<=0xE00C))
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{
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uint8 index=(((A&0x7000)>>11)-6)|((A&8)>>3);
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chr[index]=(chr[index]&(0xF0>>(A&4)))|((V&0x0F)<<(A&4));
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SyncChr();
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}
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else switch (A&0xF80C)
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{
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case 0x8800: prg[0]=V; SyncPrg(); break;
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case 0xA800: prg[1]=V; SyncPrg(); break;
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case 0xA000: prg[2]=V; SyncPrg(); break;
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case 0x9800: switch (V&3)
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{
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case 0: setmirror(MI_V); break;
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case 1: setmirror(MI_H); break;
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case 2: setmirror(MI_0); break;
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case 3: setmirror(MI_1); break;
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}
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break;
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case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break;
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case 0xF004: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break;
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case 0xF008: IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0xF00C: IRQPre=16; break;
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}
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}
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static void M183IRQCounter(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-IRQPre)==238)
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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static void M183Power(void)
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{
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IRQPre=IRQCount=IRQa=0;
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x8000,0xFFFF,M183Write);
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SetReadHandler(0x6000,0x7FFF,CartBR);
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SyncPrg();
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SyncChr();
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}
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void Mapper183_Init(CartInfo *info)
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{
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info->Power=M183Power;
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GameHBIRQHook=M183IRQCounter;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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