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https://github.com/dborth/fceugx.git
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140 lines
3.8 KiB
C
140 lines
3.8 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) 2003 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 PRGSel;
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static uint8 PBuf[4],PSel;
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static uint8 cmd;
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static uint8 DRegs[8];
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static uint32 count=0;
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static uint32 last=0;
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static DECLFW(M208Write1)
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{
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PRGSel=(V&0x1)|((V>>3)&0x2);
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setprg32(0x8000,PRGSel);
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}
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static DECLFW(M208Write2)
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{
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static uint8 lut[256]={
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01,
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0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00,
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0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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if(A<=0x57FF) PSel=V;
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else
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PBuf[(A&0x03)]=V^lut[PSel];
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}
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static DECLFR(M208Read)
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{
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return(PBuf[(A&0x3)]);
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}
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static void Sync(void)
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{
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int x;
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setchr2(0x0000,DRegs[0]>>1);
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setchr2(0x0800,DRegs[1]>>1);
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for(x=0;x<4;x++)
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setchr1(0x1000+x*0x400,DRegs[2+x]);
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}
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static DECLFW(M208HWrite)
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{
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switch(A&0xe001)
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{
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case 0xc000:IRQLatch=IRQCount=V;break;
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case 0xc001:IRQCount=IRQLatch;last=count=0;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:DRegs[cmd&7]=V;
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Sync();
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break;
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}
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}
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static void M208Power(void)
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{
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PRGSel=3;
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setprg32(0x8000,3);
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SetWriteHandler(0x4800,0x4FFF,M208Write1);
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SetWriteHandler(0x5000,0x5fff,M208Write2);
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SetWriteHandler(0x8000,0xFFFF,M208HWrite);
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SetReadHandler(0x5800,0x5FFF,M208Read);
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SetReadHandler(0x8000,0xffff,CartBR);
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}
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static void sl(void)
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{
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if(IRQa)
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{
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if(IRQCount>=0)
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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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}
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}
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}
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}
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static void FP_FASTAPASS(1) foo(uint32 A)
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{
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if((A&0x2000) && !(last&0x2000))
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{
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count++;
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if(count==42)
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{
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sl();
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count=0;
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}
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}
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last=A;
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}
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void Mapper208_Init(CartInfo *info)
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{
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info->Power=M208Power;
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//GameHBIRQHook=sl;
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PPU_hook=foo;
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}
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