mirror of
https://github.com/dborth/fceugx.git
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158 lines
3.2 KiB
C++
158 lines
3.2 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 2006 CaH4e3
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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 cmd, laststrobe, trigger;
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static uint8 DRegs[8];
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static SFORMAT StateRegs[]=
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{
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{&cmd, 1, "CMD"},
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{&laststrobe, 1, "STB"},
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{&trigger, 1, "TRG"},
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{DRegs, 8, "DREG"},
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{0}
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};
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static void Sync(void)
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{
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setprg32(0x8000,(DRegs[0]<<4)|(DRegs[1]&0xF));
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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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static DECLFR(ReadLow)
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{
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switch (A&0x7700)
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{
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case 0x5100: return DRegs[2]; break;
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case 0x5500: if(trigger)
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return DRegs[2];
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else
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return 0;
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}
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return 4;
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}
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static DECLFW(Write)
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{
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switch (A&0x7300)
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{
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case 0x5100: DRegs[0]=V; Sync(); break;
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case 0x5000: DRegs[1]=V; Sync(); break;
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case 0x5300: DRegs[2]=V; break;
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}
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}
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static DECLFW(Write2)
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{
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if(A==0x5101)
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{
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if(laststrobe&&!V)
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{
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trigger^=1;
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}
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laststrobe=V;
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}else if(A==0x5100&&V==6) //damn thoose protected games
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setprg32(0x8000,3);
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else
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switch (A&0x7300)
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{
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case 0x5200: DRegs[0]=V; Sync(); break;
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case 0x5000: DRegs[1]=V; Sync(); if(!(DRegs[1]&0x80)&&(scanline<128)) setchr8(0); break;
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case 0x5300: DRegs[2]=V; break;
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}
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}
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static uint8 WRAM[8192];
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static DECLFR(AWRAM)
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{
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return(WRAM[A-0x6000]);
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}
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static DECLFW(BWRAM)
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{
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WRAM[A-0x6000]=V;
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}
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static void Power(void)
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{
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memset(DRegs,0,8);
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DRegs[1]=0xFF;
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cmd=0;
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x4020,0x5FFF,Write);
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SetReadHandler(0x6000,0x7FFF,AWRAM);
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SetWriteHandler(0x6000,0x7FFF,BWRAM);
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setchr8(0);
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Sync();
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}
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static void M163HB(void)
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{
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if(DRegs[1]&0x80)
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{
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if(scanline==239)
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{
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setchr4(0x0000,0);
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setchr4(0x1000,0);
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}
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else if(scanline==127)
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{
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setchr4(0x0000,1);
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setchr4(0x1000,1);
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}
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}
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}
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static void Power2(void)
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{
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memset(DRegs,0,8);
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DRegs[1]=0xFF;
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laststrobe=1;
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cmd=0;
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x4020,0x5FFF,Write2);
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SetReadHandler(0x6000,0x7FFF,AWRAM);
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SetWriteHandler(0x6000,0x7FFF,BWRAM);
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SetReadHandler(0x5000,0x5FFF,ReadLow);
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setchr8(0);
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Sync();
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}
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void Mapper164_Init(CartInfo *info)
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{
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info->Power=Power;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void Mapper163_Init(CartInfo *info)
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{
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info->Power=Power2;
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GameHBIRQHook=M163HB;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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AddExState(WRAM, 8192, 0, "WRAM");
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}
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