81 lines
2.5 KiB
C++
81 lines
2.5 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 uint8 FFEmode;
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#define FVRAM_BANK8(A,V) {VPage[0]=VPage[1]=VPage[2]=VPage[3]=VPage[4]=VPage[5]=VPage[6]=VPage[7]=V?&MapperExRAM[(V)<<13]-(A):&CHRRAM[(V)<<13]-(A);CHRBankList[0]=((V)<<3);CHRBankList[1]=((V)<<3)+1;CHRBankList[2]=((V)<<3)+2;CHRBankList[3]=((V)<<3)+3;CHRBankList[4]=((V)<<3)+4;CHRBankList[5]=((V)<<3)+5;CHRBankList[6]=((V)<<3)+6;CHRBankList[7]=((V)<<3)+7;PPUCHRRAM=0xFF;}
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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(Mapper6_write)
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{
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if(A<0x8000)
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{
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switch(A){
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case 0x42FF:MIRROR_SET((V>>4)&1);break;
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case 0x42FE:onemir((V>>3)&2); FFEmode=V&0x80;break;
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case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break;
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case 0x4503:IRQCount&=0xFF;IRQCount|=V<<8;IRQa=1;break;
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}
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} else {
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switch (FFEmode)
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{
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case 0x80: setchr8(V); break;
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default: ROM_BANK16(0x8000,V>>2);
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FVRAM_BANK8(0x0000,V&3);
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}
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}
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}
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void Mapper6_StateRestore(int version)
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{
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int x;
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for(x=0;x<8;x++)
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if(PPUCHRRAM&(1<<x))
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{
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if(CHRBankList[x]>7)
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VPage[x]=&MapperExRAM[(CHRBankList[x]&31)*0x400]-(x*0x400);
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else VPage[x]=&CHRRAM[(CHRBankList[x]&7)*0x400]-(x*0x400);
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}
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}
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void Mapper6_init(void)
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{
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MapIRQHook=FFEIRQHook;
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ROM_BANK16(0xc000,7);
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SetWriteHandler(0x4020,0x5fff,Mapper6_write);
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SetWriteHandler(0x8000,0xffff,Mapper6_write);
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MapStateRestore=Mapper6_StateRestore;
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}
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