92 lines
2.0 KiB
C++
92 lines
2.0 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) 2006 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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#include "mapinc.h"
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static uint8 reg;
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static uint8 IRQCount, IRQa;
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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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{®, 1, "REG"},
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{0}
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};
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static void Sync(void)
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{
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setprg4(0x5000,16);
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setprg8(0x6000,2);
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setprg8(0x8000,1);
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setprg8(0xa000,0);
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setprg8(0xc000,reg);
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setprg8(0xe000,9);
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setchr8(0);
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}
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static DECLFW(M43Write)
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{
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int transo[8]={4,3,4,4,4,7,5,6};
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switch(A&0xf1ff)
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{
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case 0x4022: reg=transo[V&7]; Sync(); break;
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case 0x8122: IRQa=V&1; IRQCount=0; break;
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}
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}
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static void M43Power(void)
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{
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reg=0;
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Sync();
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// SetReadHandler(0x5000,0x5fff,CartBR);
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SetReadHandler(0x5000,0xffff,CartBR);
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SetWriteHandler(0x4020,0xffff,M43Write);
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}
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static void M43Reset(void)
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{
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}
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static void FP_FASTAPASS(1) M43IRQHook(int a)
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{
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IRQCount+=a;
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if(IRQa)
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if(IRQCount>=4096)
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{
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IRQa=0;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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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 Mapper43_Init(CartInfo *info)
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{
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info->Reset=M43Reset;
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info->Power=M43Power;
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MapIRQHook=M43IRQHook;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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