mirror of
https://github.com/dborth/fceugx.git
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75 lines
2.2 KiB
C
75 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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static void FP_FASTAPASS(1) FFEIRQHook(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>=0x10000)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa=0;
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IRQCount=0;
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}
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}
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}
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DECLFW(Mapper17_write)
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{
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switch(A){
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default:
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break;
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case 0x42FE:
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onemir((V>>4)&1);
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break;
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case 0x42FF:
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MIRROR_SET((V>>4)&1);
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break;
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case 0x4501:IRQa=V&1;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0x4502:IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0x4503:IRQCount&=0x00FF;IRQCount|=V<<8;IRQa=1;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0x4504: ROM_BANK8(0x8000,V);break;
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case 0x4505: ROM_BANK8(0xA000,V);break;
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case 0x4506: ROM_BANK8(0xC000,V);break;
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case 0x4507: ROM_BANK8(0xE000,V);break;
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case 0x4510: VROM_BANK1(0x0000,V);break;
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case 0x4511: VROM_BANK1(0x0400,V);break;
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case 0x4512: VROM_BANK1(0x0800,V);break;
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case 0x4513: VROM_BANK1(0x0C00,V);break;
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case 0x4514: VROM_BANK1(0x1000,V);break;
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case 0x4515: VROM_BANK1(0x1400,V);break;
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case 0x4516: VROM_BANK1(0x1800,V);break;
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case 0x4517: VROM_BANK1(0x1C00,V);break;
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}
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}
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void Mapper17_init(void)
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{
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MapIRQHook=FFEIRQHook;
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SetWriteHandler(0x4020,0x5fff,Mapper17_write);
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}
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