126 lines
2.6 KiB
C++
126 lines
2.6 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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#include "../ines.h"
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static uint8 lastA;
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static uint8 DRegs[8];
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static uint8 cmd;
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static uint8 MirCache[8];
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static SFORMAT DB_StateRegs[]={
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{DRegs, 8, "DREG"},
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{&cmd, 1, "CMD"},
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{&lastA, 1, "LAST"},
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{0}
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};
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static void toot(void)
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{
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int x;
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MirCache[0]=MirCache[1]=(DRegs[0]>>4)&1;
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MirCache[2]=MirCache[3]=(DRegs[1]>>4)&1;
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for(x=0;x<4;x++)
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MirCache[4+x]=(DRegs[2+x]>>5)&1;
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onemir(MirCache[lastA]);
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}
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static void Sync()
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{
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setchr2(0x0000,DRegs[0]&0x1F);
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setchr2(0x0800,DRegs[1]&0x1F);
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setchr1(0x1000,DRegs[2]&0x1F);
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setchr1(0x1400,DRegs[3]&0x1F);
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setchr1(0x1800,DRegs[4]&0x1F);
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setchr1(0x1C00,DRegs[5]&0x1F);
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setprg8(0x8000,DRegs[6]&0x1F);
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setprg8(0xa000,DRegs[7]&0x1F);
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toot();
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}
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static DECLFW(Mapper95_write)
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{
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switch(A&0xF001)
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{
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case 0x8000: cmd = V; break;
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case 0x8001:
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switch(cmd&0x07)
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{
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case 0: DRegs[0]=(V&0x3F)>>1; break;
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case 1: DRegs[1]=(V&0x3F)>>1; break;
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case 2: DRegs[2]=V&0x3F; break;
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case 3: DRegs[3]=V&0x3F; break;
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case 4: DRegs[4]=V&0x3F; break;
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case 5: DRegs[5]=V&0x3F; break;
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case 6: DRegs[6]=V&0x3F; break;
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case 7: DRegs[7]=V&0x3F; break;
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}
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Sync();
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}
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}
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static void FP_FASTAPASS(1) dragonbust_ppu(uint32 A)
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{
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static int last=-1;
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static uint8 z;
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if(A>=0x2000) return;
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A>>=10;
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lastA=A;
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z=MirCache[A];
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if(z!=last)
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{
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onemir(z);
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last=z;
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}
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}
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static void DBPower(void)
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{
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memset(DRegs,0x3F,8);
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DRegs[0]=DRegs[1]=0x1F;
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Sync();
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setprg8(0xc000,0x3E);
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setprg8(0xe000,0x3F);
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SetReadHandler(0x8000,0xffff,CartBR);
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SetWriteHandler(0x8000,0xffff,Mapper95_write);
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void Mapper95_Init(CartInfo *info)
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{
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info->Power=DBPower;
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AddExState(DB_StateRegs, ~0, 0, 0);
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PPU_hook=dragonbust_ppu;
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GameStateRestore=StateRestore;
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}
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