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https://github.com/dborth/fceugx.git
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105 lines
2.3 KiB
C++
105 lines
2.3 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) 2002 Xodnizel
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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 prgreg[4], chrreg[8], mirror;
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static uint8 IRQa, IRQCount, IRQLatch;
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static SFORMAT StateRegs[]=
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{
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{&IRQa, 1, "IRQA"},
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{&IRQCount, 1, "IRQC"},
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{&IRQLatch, 1, "IRQL"},
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{prgreg, 4, "PREGS"},
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{chrreg, 8, "CREGS"},
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{&mirror, 1, "MREG"},
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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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int i;
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setprg8(0x8000,prgreg[0]);
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setprg8(0xa000,prgreg[1]);
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setprg8(0xc000,prgreg[2]);
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setprg8(0xe000,prgreg[3]);
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for(i=0; i<8; i++)
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setchr1(i<<10,chrreg[i]);
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setmirror(mirror^1);
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}
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static DECLFW(M117Write)
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{
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if(A<0x8004)
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{
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prgreg[A&3]=V;
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Sync();
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}
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else if((A>=0xA000)&&(A<=0xA007))
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{
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chrreg[A&7]=V;
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Sync();
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}
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else switch(A)
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{
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case 0xc001: IRQLatch=V; break;
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case 0xc003: IRQCount=IRQLatch; IRQa|=2; break;
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case 0xe000: IRQa&=~1; IRQa|=V&1; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0xc002: X6502_IRQEnd(FCEU_IQEXT); break;
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case 0xd000: mirror=V&1;
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}
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}
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static void M117Power(void)
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{
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prgreg[0]=~3; prgreg[1]=~2; prgreg[2]=~1; prgreg[3]=~0;
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Sync();
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x8000,0xFFFF,M117Write);
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}
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static void M117IRQHook(void)
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{
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if(IRQa==3&&IRQCount)
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{
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IRQCount--;
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if(!IRQCount)
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{
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IRQa&=1;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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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 Mapper117_Init(CartInfo *info)
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{
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info->Power=M117Power;
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GameHBIRQHook=M117IRQHook;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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