mirror of
https://github.com/dborth/fceugx.git
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82 lines
2.1 KiB
C++
82 lines
2.1 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 int is48;
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static DECLFW(Mapper33_write)
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{
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//printf("%04x:%02x, %d\n",A,V,scanline);
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A&=0xF003;
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if(A>=0xA000 && A<=0xA003)
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VROM_BANK1(0x1000+((A&3)<<10),V);
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else switch(A)
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{
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case 0x8000:if(!is48) MIRROR_SET((V>>6)&1);
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ROM_BANK8(0x8000,V);
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break;
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case 0x8001:ROM_BANK8(0xA000,V); break;
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case 0x8002:VROM_BANK2(0x0000,V);break;
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case 0x8003:VROM_BANK2(0x0800,V);break;
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case 0xe000:MIRROR_SET((V>>6)&1);break;
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}
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}
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static DECLFW(Mapper48_HiWrite)
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{
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switch(A&0xF003)
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{
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case 0xc000:IRQLatch=V;break;
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case 0xc001:IRQCount=IRQLatch;break;
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case 0xc003:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0xc002:IRQa=1;break;
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case 0xe000:MIRROR_SET((V>>6)&1);break;
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}
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}
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static void heho(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==0x100)
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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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void Mapper33_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper33_write);
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is48=0;
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}
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void Mapper48_init(void)
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{
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SetWriteHandler(0x8000,0xbfff,Mapper33_write);
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SetWriteHandler(0xc000,0xffff,Mapper48_HiWrite);
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GameHBIRQHook=heho;
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is48=1;
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}
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