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https://github.com/dborth/fceugx.git
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100 lines
2.1 KiB
C
100 lines
2.1 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) 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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#define master mapbyte3[0]
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#define incmd mapbyte3[1]
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static void dochr(void)
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{
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VROM_BANK2(0x0000,(mapbyte2[0]>>1));
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VROM_BANK2(0x0800,(mapbyte2[2]>>1));
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VROM_BANK1(0x1000,mapbyte2[6]);
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VROM_BANK1(0x1400,mapbyte2[1]);
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VROM_BANK1(0x1800,mapbyte2[7]);
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VROM_BANK1(0x1c00,mapbyte2[3]);
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}
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void doprg()
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{
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if(master&0x80)
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{
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ROM_BANK16(0x8000,master&0x1F);
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}
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else
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{
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ROM_BANK8(0x8000,mapbyte2[4]);
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ROM_BANK8(0xa000,mapbyte2[5]);
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}
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}
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static DECLFW(Mapper114_write)
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{
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if(A<=0x7FFF)
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{
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master=V;
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doprg();
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}
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else if(A==0xe003) IRQCount=V;
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else if(A==0xe002) X6502_IRQEnd(FCEU_IQEXT);
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else switch(A&0xE000)
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{
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case 0x8000:MIRROR_SET(V&1);break;
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case 0xa000:mapbyte1[0]=V;incmd=1;break;
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case 0xc000:
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if(!incmd) break;
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mapbyte2[mapbyte1[0]&0x7]=V;
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switch(mapbyte1[0]&0x7)
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{
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case 0x0: case 1: case 2: case 3: case 6: case 7:
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dochr();break;
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case 0x4:
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case 0x5:doprg();break;
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}
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incmd=0;
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break;
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}
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}
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static void Mapper114_hb(void)
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{
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if(IRQCount)
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{
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IRQCount--;
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if(!IRQCount)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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//printf("IRQ: %d\n",scanline);
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}
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}
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}
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void Mapper114_init(void)
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{
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GameHBIRQHook=Mapper114_hb;
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SetWriteHandler(0x6000,0xffff,Mapper114_write);
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SetReadHandler(0x4020,0x7fff,0);
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}
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