65 lines
1.7 KiB
C
65 lines
1.7 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 DECLFW(Mapper42_write)
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{
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// FCEU_printf("%04x:%04x\n",A,V);
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switch(A&0xe003)
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{
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case 0x8000:VROM_BANK8(V);break;
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case 0xe000:mapbyte1[0]=V;ROM_BANK8(0x6000,V&0xF);break;
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case 0xe001:MIRROR_SET((V>>3)&1);break;
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case 0xe002:IRQa=V&2;if(!IRQa) IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break;
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}
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}
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static void FP_FASTAPASS(1) Mapper42IRQ(int a)
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{
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if(IRQa)
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{
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IRQCount+=a;
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if(IRQCount>=32768) IRQCount-=32768;
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if(IRQCount>=24576)
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X6502_IRQBegin(FCEU_IQEXT);
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else
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X6502_IRQEnd(FCEU_IQEXT);
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}
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}
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static void Mapper42_StateRestore(int version)
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{
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ROM_BANK8(0x6000,mapbyte1[0]&0xF);
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}
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void Mapper42_init(void)
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{
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ROM_BANK8(0x6000,0);
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ROM_BANK32(~0);
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SetWriteHandler(0x6000,0xffff,Mapper42_write);
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SetReadHandler(0x6000,0x7fff,CartBR);
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MapStateRestore=Mapper42_StateRestore;
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MapIRQHook=Mapper42IRQ;
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}
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