mirror of
https://github.com/dborth/fceugx.git
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91 lines
2.2 KiB
C
91 lines
2.2 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 cmd mapbyte1[0]
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#define lpa mapbyte1[1]
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#define prgl mapbyte2
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static void PRGSynco(void)
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{
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if(lpa&0x80)
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{
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ROM_BANK16(0x8000,lpa&0xF);
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}
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else
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{
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ROM_BANK8(0x8000,prgl[0]&0x1F);
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ROM_BANK8(0xa000,prgl[1]&0x1F);
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}
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}
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static DECLFW(Mapper248_writelow)
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{
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lpa=V;
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PRGSynco();
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}
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static DECLFW(Mapper248_write)
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{
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switch(A&0xF001)
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{
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case 0xa000:MIRROR_SET(V&1);break; // Not sure if this is right. Mirroring may be hard wired...
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case 0xc000:IRQLatch=V;break;
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case 0xc001:IRQCount=IRQLatch;break;
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case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0xe001:IRQa=1;break;
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case 0x8000:cmd=V;break;
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case 0x8001:switch(cmd&7)
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{
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case 0:VROM_BANK2(0x000,V>>1);break;
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case 1:VROM_BANK2(0x800,V>>1);break;
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case 2:VROM_BANK1(0x1000,V);break;
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case 3:VROM_BANK1(0x1400,V);break;
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case 4:VROM_BANK1(0x1800,V);break;
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case 5:VROM_BANK1(0x1c00,V);break;
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case 6:prgl[0]=V;PRGSynco();break;
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case 7:prgl[1]=V;PRGSynco();break;
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}
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break;
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}
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}
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static void Mapper248_hb(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<0)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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IRQCount=IRQLatch;
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}
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}
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}
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void Mapper248_init(void)
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{
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SetWriteHandler(0x6000,0x6fff,Mapper248_writelow);
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SetWriteHandler(0x8000,0xffff,Mapper248_write);
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GameHBIRQHook=Mapper248_hb;
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}
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